 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeDiscussion Groups General ModelsRailroadsRocketsRadio Controlled Air ModelsHelicoptersLand ModelsWater ModelsModelGeeks.com Contact UsLink To UsSearch & Site Map |
Model Forum / General / Models / February 2009Bevel + Mitre Gears
Whats the difference between the two? I'm considering using bevel gears (mitre?) to drive the governor on a small stationary steam engine. The drive would be 2:1 from the crankshaft then 1:1 to drive the governor. The crankshaft is 7/16inch and the flywheel is 7-1/2 inch diameter. The governor driveshaft can be chosen to suit, probably 3/16. Two challenges are to get the large gear on the crankshaft in proportion to the flywheel and to find a supplier who want less than £20 a piece + VAT +P&P which makes the thing not doable. RS don't have what I'm looking for and HPC looks like well into £100 for the four. EN8 or equivalent would be fine. Bronze gears would be great but I dread to think what the cost wouldbe. Any suggestions? Steve If you could change the ratios around and have 2:1 at the governor then th egears that I bought for my traction engine governor will do, brass with 1/4" bor to the large wheel, 3/16" in the small but you could solder in a bush. All for about £20 the pair. If they suit I will post details. Jason  Signaturejasonballamy > Whats the difference between the two? > [quoted text clipped - 14 lines] > > Steve Why not make your own? Peter On Jan 29, 10:17 pm, "Steve" <steve.withn...@btinternet.com> wrote: > Whats the difference between the two? > [quoted text clipped - 16 lines] > > Steve Why not make your own? Peter Looks too dificult - I have a mill and decent rotary table, so plain spur gears I can do, but bevel gears look beyond beyond me. > Looks too dificult - I have a mill and decent rotary table, so plain > spur gears I can do, but bevel gears look beyond beyond me. Wise decision. Proper bevel gears cannot be milled as the tooth pitch is not constant. SignatureVenlig hilsen/Best regards Erik Olsen http://www.modelbaneteknik.dk/ > > Looks too dificult - I have a mill and decent rotary table, so plain > > spur gears I can do, but bevel gears look beyond beyond me. [quoted text clipped - 5 lines] > Venlig hilsen/Best regards > Erik Olsenhttp://www.modelbaneteknik.dk/ So machine them as parallel depth bevels, it was a dodge brought out in WWI so engineering shops could do bevels along a simpler line. It save the hand fitting needed to part of the addendum. John S. >So machine them as parallel depth bevels, it was a dodge brought out >in WWI so engineering shops could do bevels along a simpler line. >It save the hand fitting needed to part of the addendum. > >John S. Doesn't that involve a second cut with the gear advanced a bit to thin the teeth? I'm sure Ivan Law had something to say on the subject. regards Mark Rand RTFM There are errors in Law's methods. Been a recent post about cuttin bevels on this forum. http://modeleng.proboards20.com/index.cgi?board=general&action=display&thread=3282 Another thought to keep the costs down as the gears don't need t transmit much load is to use an off the shelf gear with a smaller O/ dia and bore, then bore it out to suit the 7/16 shaft. Jaso -- jasonballam On 30 Jan, 21:56, "Erik Olsen" <erik.ol...@ishoejby.dk> wrote: > Steve wrote: > > Looks too dificult - I have a mill and decent rotary table, so plain [quoted text clipped - 6 lines] > Venlig hilsen/Best regards > Erik Olsenhttp://www.modelbaneteknik.dk/ So machine them as parallel depth bevels, it was a dodge brought out in WWI so engineering shops could do bevels along a simpler line. It save the hand fitting needed to part of the addendum. John S. Is this the thing - ME Vol 130, No.3261 p814 "Cutting bevel gears by the parallel depth method" by R.S.Minchin might offer some sensible advice. On 30 Jan, 21:56, "Erik Olsen" <erik.ol...@ishoejby.dk> wrote: > Steve wrote: > > Looks too dificult - I have a mill and decent rotary table, so plain [quoted text clipped - 6 lines] > Venlig hilsen/Best regards > Erik Olsenhttp://www.modelbaneteknik.dk/ So machine them as parallel depth bevels, it was a dodge brought out in WWI so engineering shops could do bevels along a simpler line. It save the hand fitting needed to part of the addendum. John S. Just found this as a legitimate PDF download - Handbook for machine designers, shop men and draftsmen (1916) which has trhe design data and method on p113 - 116 > <petercolma...@hotmail.com> wrote in message > [quoted text clipped - 29 lines] > > - Show quoted text - You need a dividing head which can be tilted, you will find the calculations in Machinerys handbook. I have done several but it does take time and concentration, If you need help contact me. Peter >Whats the difference between the two? > [quoted text clipped - 14 lines] > >Steve Don't know about prices, I've not used them for a while, but SH Muffett were helpful a few years ago. www.muffettgears.co.uk/ Richard |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2012 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.