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Model Forum / General / Models / May 2008quick question
What's a typical cutting speed for (assumed) mild steel, using an HSS tool? I've got some steel van wheels on which I need to put chamfers on the holes. I've got a 90 degree 6-flute cutter, but I'm wondering what speed I can run it. The drill which will be easiest to use only goes down to about 450rpm. To use the big drill (which will run slower) I have to do the work with the tyres off, which makes it more hassle. I don't know that they're mild steel, mark you. But I doubt they're anything exotic.  SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! On 30 Apr, 19:26, Austin Shackles <austinDITCHTHISFORBETTERRESU...@ddol-las.net> wrote: > What's a typical cutting speed for (assumed) mild steel, using an HSS tool? > [quoted text clipped - 12 lines] > >> http://www.schlockmercenary.com/ << \ ...and Kill them. > a webcartoon by Howard Tayler; I like it, maybe you will too! Rule of thumb for HSS on mild steel is 70 feet/minute.Sounds like a countersink you have so could drop to lower speed,try 50 FPM.Main thing is to cut rather than rub and chatter.Always start slow and work up so you don`t burn the tool out. >What's a typical cutting speed for (assumed) mild steel, using an HSS tool? > [quoted text clipped - 6 lines] >I don't know that they're mild steel, mark you. But I doubt they're >anything exotic. I sometimes do hole chamfers for flush rivetting with a 3-flute countersink in a mini mag drill, which runs at 450 rpm. If everything isn't 'just so' it will tend to chatter, I should think a hand-held drill would be worse. Holes are usually around 5/8" dia. Tim >>What's a typical cutting speed for (assumed) mild steel, using an HSS tool? >> [quoted text clipped - 11 lines] >isn't 'just so' it will tend to chatter, I should think a hand-held >drill would be worse. Holes are usually around 5/8" dia. this is going to be done in the new toy, which is the floor-mounted version of this: http://www.axminster.co.uk/product-Perform-CCRD-Radial-Pillar-Drill-21729.htm cheap but not too badly made. The 6-flute 'sink is supposed not to chatter so much... hmmm. say 1" dia, that's about 3" circumference or abotu a quarter of a foot, and 450 rpm... 112.5 FPM. bit fast, then, I really want about a couple of hundred rpm. arse, that means bringing the wheels here from the tyre place, working on them and taking them back to have tyres fitted. The big machine that goes slowly doesn't have enough overhang. That or modify the drill, of course - I had been thinking about an idler pulley set and 2 belts to get more speeds, and I've got a spare pulley block somewhere... However, Ideally I want it done tomorrow, provided the wheels are to hand. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! On Apr 30, 9:53 pm, Austin Shackles <austinDITCHTHISFORBETTERRESU...@ddol-las.net> wrote: > >>What's a typical cutting speed for (assumed) mild steel, using an HSS tool? > [quoted text clipped - 33 lines] > > However, Ideally I want it done tomorrow, provided the wheels are to hand. YEAH right ....."TOY" and to blinking fast . have a look at this beauty http://cgi.ebay.co.uk/Kitchen-Wade-Radial-Drilling-Machine_W0QQitemZ320246207524 QQihZ011QQcategoryZ64819QQssPageNameZWDVWQQrdZ1QQcmdZViewItem all the best.markj >YEAH right ....."TOY" > >and to blinking fast . too fast for this job, but handy for drilling small stuff, which is mainly what it's for, and it was cheap. I can address "too fast" as well, given time - I looked at it and there's scope to make an idler pulley mount in the middle of the belt case, there are even mounting holes for it. But not today. I'll look into that when I have time and put a double belt on. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! > The big machine > that goes slowly doesn't have enough overhang. Can you tie a strap around the tyre and pull it towards the rim to clear the drill pillar? Ratchet tie down straps work well for this sort of thing. John >> The big machine >> that goes slowly doesn't have enough overhang. >> >Can you tie a strap around the tyre and pull it towards the rim to >clear the drill pillar? >Ratchet tie down straps work well for this sort of thing. did it in 2 stages, got the rims, machined 'em, which went very nicely at 90 rpm, didn't even run warm without coolant, then took 'em back to get tyres on 'em. The ratchet strap idea wouldn't have worked - there was only about an inch or two of clearance from the rim to the pillar. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! > What's a typical cutting speed for (assumed) mild steel, using an HSS > tool? A good rule of thumb, and easy to remember, is 100mm dia -> 100 RPM Then 50mm dia -> 200 RPM etc Likewise, double the RPM for brass, halve for exotics ... > I've got some steel van wheels on which I need to put chamfers on the > holes. > I've got a 90 degree 6-flute cutter, but I'm wondering what speed I can > run > it. Well, i'd use a chamfering tool, which is just a triangular-shaped normal lathe tool (triangle looking down from the top) with a flat top. Speed say about a third 'normal', just a bit faster than parting. If you use the 6-flute cutter, i'd think it would need to be VERY slow, Hope that helps, Peter On Apr 30, 7:26 pm, Austin Shackles <austinDITCHTHISFORBETTERRESU...@ddol-las.net> wrote: > What's a typical cutting speed for (assumed) mild steel, using an HSS tool? > [quoted text clipped - 12 lines] > >> http://www.schlockmercenary.com/ << \ ...and Kill them. > a webcartoon by Howard Tayler; I like it, maybe you will too! Good countersink bits are expensive to buy and wont last long, if turned at 450 rpm .... Turn them at below 100 rpm, with rtd fluid to lube .and they will last a long time . all the best..markj >Good countersink bits are expensive to buy yeah, it was a bit. >and wont last long, if turned at 450 rpm .... > >Turn them at below 100 rpm, with rtd fluid to lube .and they will last >a long time . aye, I'll have to do the job in 2 stages. I was hoping to avoid that, but nemmind. The bigger drilling machine will go down to sub-100 speeds, but the wheels won't fit under it with tyres on, as it's not got enough throat depth. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! |
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