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Model Forum / General / Models / February 2007Plate glass as a surface plate?
Is a piece of plate glass any use as a surface plate? It looks to be about 8mm thick. I know someone who's getting rid of a fish tank and realised I could do with something a bit flatter than my workbench surface but not necessarily the last word in accuracy. Chris  SignatureChris Eilbeck Plate glass is fine if put into a decent wooden support to prevent damage and provide some restraint against accidents. I have two, a small one that is bench top friendly and is large enough to accommodate a height gauge and a small job, and a larger one also bench useable but it needs the whole bench .... which means a tidy up! Don't expect surface plate accuracy but for most work you will not notice a difference. > Plate glass is fine if put into a decent wooden support to prevent > damage and provide some restraint against accidents. I have two, a [quoted text clipped - 3 lines] > up! Don't expect surface plate accuracy but for most work you will > not notice a difference. Ta. I've got some worktop offcuts somewhere. I could just bond a piece of glass down to that with some contact adhesive. Chris SignatureChris Eilbeck >> Plate glass is fine if put into a decent wooden support to prevent >> damage and provide some restraint against accidents. I have two, a [quoted text clipped - 8 lines] > >Chris I would suggest running generous lines of silicone rubber at 1"-1.5" intervals and resting the glass on them before the rubber has gone off. That might not distort the glass as much. Mark Rand RTFM > Is a piece of plate glass any use as a surface plate? It looks to be > about 8mm thick. I know someone who's getting rid of a fish tank and > realised I could do with something a bit flatter than my workbench > surface but not necessarily the last word in accuracy. > > Chris Eilbeck Hi Chris, I presume it is float glass that you are to use. I was working as a telephone engineer in St Helens in the late 1950's when plate glass was still being ground. Large piles of ground glass powder & abrasive were everywhere. At the same time I sometimes went to fix a phone in the "new department" I had to wait while canvas screens were put round the work equipment so I couldn't tip off the opposition about what they were trying. It was the start of making float glass. SignatureDave Croft Warrington http://oldengine.org/members/croft/homepage http://community.webshots.com/user/crftdv > Hi Chris, I presume it is float glass that you are to use. I woudl assume so. Originally it came from a shop window and has already been recycled into a fishtank once. I'm tempted to have a go at making a telescope using another bit of it, laminating several pieces together and building a grinding rig. > I was working as a telephone engineer in St Helens in the late > 1950's when plate glass was still being ground. Large piles of [quoted text clipped - 3 lines] > tip off the opposition about what they were trying. It was the > start of making float glass. Excellent! I've had the "hey, that looks cool, what you doing?", "don't ask and I won't have to lie to you!" conversation many times at work. Chris SignatureChris Eilbeck You do know that glass is a liquid- and continues to remain in this state. So, after a while- it ain't flat any more. Next? Norman On Feb 24, 8:18 pm, "ravensworth2674" <nor...@n- atkinson.wanadoo.co.uk> wrote: > You do know that glass is a liquid- and continues to remain in this > state. [quoted text clipped - 3 lines] > > Norman My car door window didn't feel very liquid when it exploded all over me the other week :( Stu G > You do know that glass is a liquid- and continues to remain in this > state. > So, after a while- it ain't flat any more. > > Next? You do know that flowing glass is a myth, don't you? http://en.wikipedia.org/wiki/Glass#Glass_as_a_liquid Chris SignatureChris Eilbeck > > You do know that glass is a liquid- and continues to remain in this > > state. [quoted text clipped - 9 lines] > -- > Chris Eilbeck Chris, The jury is still out on that, Don't let me stop you but granite is a lot less controversial. At the skint stage ie my my assets were not as liquid, I used a plate glass but it was soon scratched to buggery. Again, Stu, tempered glass is done by spraying red hot windscreens with water. Aren't you glad that your shattering screen was cold? Sorry, folks but the post did attract the odd comment- or three Norm >> > You do know that glass is a liquid- and continues to remain in this >> > state. [quoted text clipped - 8 lines] > Chris, > The jury is still out on that, I've yet to see any peer-reviewed source that says it is liquid and a lot that say it's all a myth. > Don't let me stop you but granite is a lot less controversial. At > the skint stage ie my my assets were not as liquid, I used a plate > glass but it was soon scratched to buggery. Granite worktop is expensive though. Marble is pretty cheap but really soft, softer than glass it seems. I'll give it a go. There's nowt to lose at this stage. Chris SignatureChris Eilbeck I recall one of the Pelican Books about 1944 called surprisingly Plastics and it brought in the newer plastics which we take for granted today. Glass was claimed to be the first plastic. It ain't rocket science! Again, 8mm of glass whether it flows or not, is not adequate as a surface place, 20mm perhaps but 8mm- well? Again, marble is not only soft but is attacked by any weak acid. I have a ruined marble top in Spain which simply had wine vinegars on it. The classical approach is cast iron and now granite- because it is cheap. Sounds a bit like 'Tubal Cain' strikes again. Norm I use a gas oven glass door. It did not flow, I had to undo the screws >>> > You do know that glass is a liquid- and continues to remain in this >>> > state. [quoted text clipped - 22 lines] > > Chris Obviously, head in' for a conclusion. > You do know that flowing glass is a myth, don't you? Whether it is a myth or not seems to depend upon your definition of a liquid. If you define liquid by something that flows then glass basically doesn't flow appreciably at room temperature. If you define liquid as a non-crystalline condensed state of matter then glass conforms to this. SignatureBoo >> You do know that flowing glass is a myth, don't you? > [quoted text clipped - 3 lines] > define liquid as a non-crystalline condensed state of matter then > glass conforms to this. It doesn't really matter what you call it, there's no credible evidence (in the sense of scientific peer review) that it flows. I've never seen any despite looking quite extensively and no-one has presented any when I've talked about this before. Chris SignatureChris Eilbeck >>> You do know that flowing glass is a myth, don't you? >> Whether it is a myth or not seems to depend upon your definition of [quoted text clipped - 5 lines] > It doesn't really matter what you call it, there's no credible > evidence (in the sense of scientific peer review) that it flows. It may be that no-one cares enough to research and publish : there are credible reports of glass flowing though, see about half way down : <http://tafkac.org/science/glass.flow/glass_flow_the_thread.html> I'll give the quote here to save a search : "Sorry to pop yer bubble, Ray, but guess what - we do! There was even a bit in New Scientist a while back about a ghost image formed by a 200-yearold mirror that had flowed downwards. The mirror was thicker at the bottom than at the top. Due to a fairly complex optical phenomenon this caused a ghost image to hover a few mm off the surface. The sad fact is that glass *is* a liquid, but of a type known as a nonNewtonian fluid. It has astonishingly high viscosity, but it's a liquid nonetheless. I would suspect that the impurities introduced into glass to colour it raise the 'melting' point (i.e. raise the viscosity). Also, remeber that most pieces of glassware in museums have been buried until fairly recently. You do get voids in glass panes that are sufficiently old. Take a look at some of the glass in Canterbury Cathedral if you're in the UK. " SignatureBoo >The sad fact is that glass *is* a liquid, but of a type known as a nonNewtonian >fluid. It has astonishingly high viscosity, but it's a liquid nonetheless. Not according to most scientists. It is an amorphous solid. There are lots of web sites about this, this one sums it up quite well http://dwb.unl.edu/Teacher/NSF/C01/C01Links/www.ualberta.ca/~bderksen/florin.html non-newtonian liquids are something else entirely -and great fun for kids of all ages! Regards Kevin > non-newtonian liquids are something else entirely -and great fun for > kids of all ages! > > Regards > Kevin And very useful for reverse imprints of tooling and moulding features too, although mine is now extremely grubby after too many ears of service! Pe > Not according to most scientists. It is an amorphous solid. There > are lots of web sites about this, this one sums it up quite well > http://dwb.unl.edu/Teacher/NSF/C01/C01Links/www.ualberta.ca/~bderksen/florin.html Interesting site, note the quote "As kinetically frozen forms of liquid, glasses are characterized by a complete lack of long-range crystalline order and are the most structurally disordered types of solid known. [Jeanloz & Williams, 1991, p. 659]" I presume a kinetically frozen liquid is one that flows but at a zero rate ? </kidding> :-) SignatureBoo >non-newtonian liquids are something else entirely -and great fun for >kids of all ages! ...as demonstrated in this YouTube video... http://www.youtube.com/watch?v=f2XQ97XHjVw Regards, Tony >>non-newtonian liquids are something else entirely -and great fun for >>kids of all ages! [quoted text clipped - 5 lines] >Regards, >Tony Excellent example, and much more fluid than the usual cornflour mixes that this is demonstrated with. Regards Kevin >>> You do know that flowing glass is a myth, don't you? >> [quoted text clipped - 10 lines] > > Chris When glass visibly flows it becomes a conductor - just about red heat. Steve > When glass visibly flows it becomes a conductor - just about red heat. Ah yes, the experiment with the bunsen burner and the car battery. Not quite as much fun as thermite but still ... I take it you've all seen the Ribbands Explosives Power and Precision dvd? Chris SignatureChris Eilbeck >> When glass visibly flows it becomes a conductor - just about red heat. > Ah yes, the experiment with the bunsen burner and the car battery. Wassat ? > Not quite as much fun as thermite but still ... > > I take it you've all seen the Ribbands Explosives Power and Precision dvd? Nope. Where it is, shirts ? SignatureBoo > >> When glass visibly flows it becomes a conductor - just about red heat. >> Ah yes, the experiment with the bunsen burner and the car battery. > > Wassat ? You get a glass rod clamped horizontally and put jump leads from a car battery at opposite ends. You heat the middle of the bar with a couple of bunsen burners which make the glass conductive before it melts. The current then flows and heats the glass until it melts. Very spectacular when I saw it. >> Not quite as much fun as thermite but still ... >> I take it you've all seen the Ribbands Explosives Power and >> Precision dvd? > > Nope. Where it is, shirts ? They have a bit of a thing for Billy Bass. They also show a pot of thermite on a table above a butane tank. Naturally there are lots of sparks, molten iron and kaboom. It's worth looking out for. Chris SignatureChris Eilbeck > You get a glass rod clamped horizontally and put jump leads from a car > battery at opposite ends. You heat the middle of the bar with a > couple of bunsen burners which make the glass conductive before it > melts. The current then flows and heats the glass until it melts. > Very spectacular when I saw it. Sounds exciting, I may have a go at that. Would a gas ring do instead of a bunsen burner dyt ? >>> I take it you've all seen the Ribbands Explosives Power and > [quoted text clipped - 3 lines] > > It's worth looking out for. I'll keep an eye out but the £18 price I've seen quoted on the web is a bit dear for such a thing. Cheers, SignatureBoo >> When glass visibly flows it becomes a conductor - just about red heat. > [quoted text clipped - 4 lines] > > Chris Bugger, you mean you don't need a mains lamp for the demo? Not seen the DVD though - Steve > You do know that glass is a liquid- and continues to remain in this > state. [quoted text clipped - 3 lines] > > Norman Well, the old 72 inch mirror at the Dominion Astrophysical Observatory in Canada has retained the accuracy of it's optical surface since 1918! It was replaced with a ceramic mirror about 25 years ago. The old glass mirror is currently on display, but is available as a spare. The new one is re-aluminised at least once a year, so there is always the risk of damage, as it is removed and lowered to the ground floor. The cleaning tray, and vacuum chamber are on that level. Steve R. >> Is a piece of plate glass any use as a surface plate? It looks to be >> about 8mm thick. I know someone who's getting rid of a fish tank and [quoted text clipped - 10 lines] >the opposition about what they were trying. >It was the start of making float glass. If supported properly, true plate glass can come close to conventional surface plate accuracy. This is because ofthe tightly controlled grinding and polishing process. Unfortunately it's pretty rare now having been almost completely replaced by float glass. Float glass is made by allowing a continuously flowing layer of glass to solidify on a bed of molten metal. As it solidifies it is drawn off while still semi solid and allowed to cool passing through a series of rollers. The float process ensures extremely uniform thickness but the flatness (i.e. curvature) is not as well controlled as it depends on the precise alignment of the cooling roller train. With constant thickness, minor curvature doesn't matter for window glass because it doesn't distort the image. The same is not true for mirrors. Old mirrors are either true plate glass or the highest grade of float glass so large mirrors are a safer source when flatness is important. A better bet is granite floor tiles. These are finished by a similar process to plate glass although not so tightly controlled. I have a slightly damaged 12"x12" x 10mm floor tile bought from Wickes(£2). Supported on a piece of carpet and checked with a grade A straight edge the polished side is uniformly slightly concave. 0.0005" E300 video tape can be pulled through but an 0.001" feeler will not enter. There's no guarantee that all tiles will be of this quality but the polished surface makes it easy to make an initial check. The eye is pretty sensitive to image distortion - view a distant sharp edged object by approx 45 deg reflection. There should be NO image change as the tile is tilted to move the reflection point over the area of the tile. Jim >>> Is a piece of plate glass any use as a surface plate? It looks to be >>> about 8mm thick. I know someone who's getting rid of a fish tank and [quoted text clipped - 51 lines] > > Jim Good tips Jim, thanks Steve > Is a piece of plate glass any use as a surface plate? Before using that, I would support 3 corners of the glass and press down the forth. Not to forget the dial-indicator on that forth edge. I guess I would give up that idea, because it is not stable enough. My granite plate (350 x 350mm) is about 80mm thick. Granite plates aren't that expensive anymore. If you want to make serious and reliable work, it's the only way to go. IMHO. Nick Signature*********************************** *** Available now in NZ and AUS *** *********************************** <http://www.yadro.de> > Is a piece of plate glass any use as a surface plate? It looks to be > about 8mm thick. I know someone who's getting rid of a fish tank and > realised I could do with something a bit flatter than my workbench > surface but not necessarily the last word in accuracy. > > Chris When I was in Technical school in the 1950s, the machine shop had a glass surface plate. It was in a shallow wooden box that provided support around the edges. The frame was filled with putty to provide further support. The plate glass was 1/2 inch thick, and had been ground against two others to produce a reasonable flat. It was left with a frosted finish, which was accurate enough for our purposes. Steve R. Gentlemen, I am wise enough to have float glass covering a painting of the first steam loco going across the Border Counties Bridge at Berwick on Tweed. I am old enough to have old mirror glass dating back at least 150 years and also to have lived next door almost to a glassworks on the Tyne and whatever. With somewhat rheumy eyes I can still determine reasonably flat and the relationship between 8 mm fish tank and 12mm ground glass in a workshop's reasonably controlled environment. I made my somewhat ascerbic comments echoing the late Professor C E M Joad's quip of 'It all depends on what you mean by (?)' Somewhat less seriously, there is a better solution! >Is a piece of plate glass any use as a surface plate? It looks to be >about 8mm thick. I know someone who's getting rid of a fish tank and >realised I could do with something a bit flatter than my workbench >surface but not necessarily the last word in accuracy. I wouldn't have trouble using it. Depending on your other interests, you might have a table saw or jointer with a flat surface that you can press into service. Wes >>Is a piece of plate glass any use as a surface plate? It looks to >>be about 8mm thick. I know someone who's getting rid of a fish tank [quoted text clipped - 4 lines] > interests, you might have a table saw or jointer with a flat surface > that you can press into service. Unfortunately I don't have anything else I can use - too many hobbies, too much stuff, too little space. As it stands, I have to move the bikes out of the shed before I can work at the bench. Chris SignatureChris Eilbeck I recall reading the comments of John Ruskin 'When we build, let us think that we build forever' I can't recall his deliberations on fishtanks but he did write by a far more extensive and expansive stretch of water- and I suspect- imagination! Tesco and I believe Argos, both offer ground granite slabs as chopping boards. They're some 300 X 200 X 25 and to a novice like me, appears to be well up to the task of behaving like a surface plate. I've sited one on a rubber mat on top of the bench and it suits my purposes well Les > Tesco and I believe Argos, both offer ground granite slabs as > chopping boards. They're some 300 X 200 X 25 and to a novice like > me, appears to be well up to the task of behaving like a surface > plate. I've sited one on a rubber mat on top of the bench and it > suits my purposes well Excellent. Thanks. The fishtank may well go off to be new bottles ;o) Chris SignatureChris Eilbeck >> Tesco and I believe Argos, both offer ground granite slabs as >> chopping boards. They're some 300 X 200 X 25 and to a novice like [quoted text clipped - 6 lines] > > Chris Asda do them as well - I just bought myself one - 12 quid for about 24x18 inches. I used to use a 12" square piece of marble fire surround, 'til I dropped it moving sheds. SignatureBigEgg Hack to size. Hammer to fit. Weld to join. Grind to shape. Paint to cover. http://www.workshop-projects.com - Plans and free books - *Now with forum* > Tesco and I believe Argos, both offer ground granite slabs as chopping > boards. They're some 300 X 200 X 25 and to a novice like me, appears to be > well up to the task of behaving like a surface plate. I've sited one on a > rubber mat on top of the bench and it suits my purposes well Ahem. At the risk of being monumentally off topic, can I ask a question about the Sugden Au51-P ? BugBear > > Tesco and I believe Argos, both offer ground granite slabs as chopping > > boards. They're some 300 X 200 X 25 and to a novice like me, appears to be [quoted text clipped - 5 lines] > > BugBear No problem if the group will indulge......ask away >>> Tesco and I believe Argos, both offer ground granite slabs as chopping >>> boards. They're some 300 X 200 X 25 and to a novice like me, appears to [quoted text clipped - 8 lines] > > No problem if the group will indulge......ask away It's horribly specific, I'm afraid. My local shop has replaced the output relays for the 3rd time; they last around 5 years. But now they say that Sugden have no more suitable spec relays, which means around 5 years from now, my (ahem) quite expensive (and much liked) amplifier will become scrap. Unless (of course) a different relay can be used, or the amp modified to not have a relay. Any advice? BugBear >>>> Tesco and I believe Argos, both offer ground granite slabs as chopping >>>> boards. They're some 300 X 200 X 25 and to a novice like me, appears to [quoted text clipped - 24 lines] > > BugBear I am no expert on such things, so please take this as a suggestion for further research! However, AIUI the output relays on power amplifiers are included to protect the loudspeakers from switching transients - they delay connecting the output until the amplifier has stabilised. you could probably achieve the same protection by turning the volume control to zero while switching on, then turning up to listening volume after a few seconds (having, of course, by-passed the relay when it has died). A little observation with an oscilloscope would probably show you what was going on. I'm sure a better solution would be to find a suitable replacement relay, but I can't help with a suggested alternative. In fact, it is probably not a simple relay, but must incorporate a delay switch (thermal?). Best of luck! David SignatureDavid Littlewood >>> "bugbear" <bugbear@trim_papermule.co.uk_trim> wrote in message >>>> off topic, can I ask a question about the Sugden Au51-P ? >>>> [quoted text clipped - 21 lines] > further research! However, AIUI the output relays on power amplifiers > are included to protect the loudspeakers from switching transients - Sometimes, sometimes the output relays in amps are designed to protect the amp against short circuits in the loudspeaker leads, sometimes both functions are on one relay or they use two or more relays. But he didn't say it was an output relay. Sometimes a relay in an amp is for ps overload or even fire protection. High-end ones sometimes use them for input switching as well! The list goes on... > they delay connecting the output until the amplifier has stabilised. you > could probably achieve the same protection by turning the volume control > to zero while switching on, then turning up to listening volume after a > few seconds (having, of course, by-passed the relay when it has died). That won't work reliably against startup transients. It might in some cases, depending on design, but even then what if the kids turn the amp on without turning the knob down? If there's a brief power cut? > A little observation with an oscilloscope would probably show you what > was going on. [quoted text clipped - 3 lines] > probably not a simple relay, but must incorporate a delay switch > (thermal?). Nope, they are simple relays: either a delay is electronically generated or often on high-end equipment it tests to see whether the condition it protects against is absent. I've been out of the electronic repair field for a good while (there's no money in it now when it's cheaper to buy the foreign-made-latest-greatest than to repair it at a reasonable charge - high end Brit/US stuff yes, but there isn't enough work unless you sit in a workshop all day and someone brings you work and takes a large chunk of the profits, which ends up being poorly-paid as well and boring to boot), and I've never worked on a Sugden Au51-P, but I'd be very surprised if a competent electronic engineer couldn't find some suitable replacement relays somewhere. SignaturePeter Fairbrother >It's horribly specific, I'm afraid. > [quoted text clipped - 12 lines] > > BugBear We use a lot of relays, both PCB and power stuff, and also small DC contactors. If the original relay type can be determined, and thus the ratings, it should be possible to find either a relay or a small contactor do do the job. A lot of small-volume relays went out of the market when Schrack and Tyco were buying up the industry, but there are a lot of options still available and it sounds as though the originals may possibly have been too small anyway. Get some details and let's have a look at it. Peter -- Peter A Forbes Prepair Ltd, Luton, UK prepair@easynet.co.uk http://www.prepair.co.uk >Tesco and I believe Argos, both offer ground granite slabs as chopping >boards. They're some 300 X 200 X 25 and to a novice like me, appears to be >well up to the task of behaving like a surface plate. I've sited one on a >rubber mat on top of the bench and it suits my purposes well > >Les I bought one of these from Argos earlier today. It's Item No. 842/0486 - " Granite Worktop Saver" - price was £ 9.99p and is mounted on four small rubber feet. Most importantly, mine has a dip of at least two thou in the middle...the only feeler gauge I had to hand! In spite of that, it has the prospect of being a useful, cheap-and-cheerful workshop accessory for those jobs which don't require a great deal of accuracy and you need a reasonably flat, clean surface. -- Chris Edwards (in deepest Dorset) "....there *must* be an easier way!" >>Tesco and I believe Argos, both offer ground granite slabs as chopping >>boards. They're some 300 X 200 X 25 and to a novice like me, appears to be [quoted text clipped - 11 lines] >cheap-and-cheerful workshop accessory for those jobs which don't require a >great deal of accuracy and you need a reasonably flat, clean surface. Chris, I wonder if the "four rubber feet" are contributing to the problem; try supporting the slab all over and see if that helps. Even granite bends. As an alternative, buy another two plates, then you can generate 3 plates as flat as you want by grinding them together A -> B, B -> C, C -> A, A -> B and so on until satisfied. David SignatureDavid Littlewood >As an alternative, buy another two plates, then you can generate 3 >plates as flat as you want by grinding them together A -> B, B -> C, C >-> A, A -> B and so on until satisfied. Thanks for the suggestion but, as my dear old mother would have said " Life's too short to stuff a mushroom" ! -- Chris Edwards (in deepest Dorset) "....there *must* be an easier way!" >> As an alternative, buy another two plates, then you can generate 3 >> plates as flat as you want by grinding them together A -> B, B -> C, C >> -> A, A -> B and so on until satisfied. > > Thanks for the suggestion but, as my dear old mother would have > said " Life's too short to stuff a mushroom" ! nah - tomatoes maybe, but mushrooms take no time at all. fry some onion, and breadcrumbs while grilling the mushrooms on a bit of foil, add nuts and cheese then just tip the lot o top of the mushies and grill a bit more. delicious! what - you didn't think I was going to try and put the stuffing _inside_ the mushroom, did you? or clean the grill? SignaturePeter I'm on drugs - what's your excuse? :) > Is a piece of plate glass any use as a surface plate? It looks to be > about 8mm thick. I know someone who's getting rid of a fish tank and > realised I could do with something a bit flatter than my workbench > surface but not necessarily the last word in accuracy. This comes up A LOT in woodworking circles. Float glass is flat, but not terribly rigid. And (as I'm sure you know, accuracy is meangingless without rigidity) If you end up needed to support it (in large sizes) the resulting (composite) object is as flat as the support, not the glass. Granite plates are now cheap enough that I would recommend them (depending on your requirments) http://cgi.ebay.co.uk/GRANITE-INSPECTION-SURFACE-PLATE-300-X-200-X-50MM_W0QQitem Z220083735405QQihZ012QQcategoryZ63915QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://www.rutlands.co.uk/cgi-bin/psProdDet.cgi/DKX31 http://www.axminster.co.uk/category-Surface-Plates-208129.htm BugBear if anyone cares, this is why I care about surface plates http://www.geocities.com/plybench/flatten.html >> Is a piece of plate glass any use as a surface plate? It looks to be >> about 8mm thick. I know someone who's getting rid of a fish tank and [quoted text clipped - 24 lines] >if anyone cares, this is why I care about surface plates >http://www.geocities.com/plybench/flatten.html Bugbear - very interesting. And, if you want a really fine scraper to continue your efforts, see http://www.greenwood-tools.co.uk/ishop/728/shopscr63.html David SignatureDavid Littlewood >> if anyone cares, this is why I care about surface plates >> http://www.geocities.com/plybench/flatten.html [quoted text clipped - 3 lines] > > http://www.greenwood-tools.co.uk/ishop/728/shopscr63.html Thanks - but it turns (turned) out that square files and 80 grit AlZi were more appropriate and/or convenient to what I was doing. "true" scraping is overkill, I'm just using (and advocating) the "print" part of the process in conjunction with rather more rapid metal removal techniques. (one guy used a 4" angle grinder in the early stages!!) BugBear > Bugbear - very interesting. And, if you want a really fine scraper to > continue your efforts, see > > http://www.greenwood-tools.co.uk/ishop/728/shopscr63.html I can recommend them. But for that work, the 20mm wide type is better. But then again, the carbide plates with 20mm have the same radius as the 25mm plates. And that requires regrinding to a smaller radius ... Then it is a perfect tool. Nick Signature*********************************** *** Available now in NZ and AUS *** *********************************** <http://www.yadro.de> >Bugbear - very interesting. And, if you want a really fine scraper to >continue your efforts, see > >http://www.greenwood-tools.co.uk/ishop/728/shopscr63.html > >David I have one, from a different source (right time, right place) and enough inserts to keep me going (different ditto). They are vastly better than carbon steel for flat work. The carbide edges only need honing every three or four hours rather than every five or ten minutes for the steel. A file is still much faster for most work though. Mark Rand RTFM |
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