Cutting Bevel Gears

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Cutting Bevel Gears

This topic has 36 replies, 15 voices, and was last updated 25 October 2010 at 20:11 by Sub Mandrel.

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24 April 2010 at 18:22 #15467
Engine Builder
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@enginebuilder
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24 April 2010 at 18:22 #51080
Engine Builder
Participant
@enginebuilder
Does anyone have details of the calculations for cutting constant depth bevel gears using standard involute gear cutters. I have actually cut gears before using this method using details in a borrowed book but I no longer have acess to it. Ivan Law doesn’t help much in his book and only describes mitre gears, I am looking for the calculations needed when the gears are diifferent sizes.
24 April 2010 at 21:09 #51085
macmarch
Participant
@macmarch
Hi Engine Builder,

Daval Gears will, if asked nicely send you a cat of “Metric Drive Components”

It contains all you could possibly wish to know about gears. They can be contacted on 01707 283131
24 April 2010 at 21:25 #51086
Steve Garnett
Participant
@stevegarnett62550
It’s just possible that all you need to know is in this PDF…
24 April 2010 at 21:35 #51088
Engine Builder
Participant
@enginebuilder
Thank you macmarch. I already have this book but had forgotten I had it !

Thank you Steve. Details of cutting your own gears are given but refer to the special bevel gear cutters not regular involute ones like Ivan Law describes.
24 April 2010 at 22:01 #51089
macmarch
Participant
@macmarch
Out of interest, has anyone been able to get a copy of Haroaki’s (not sure of the spelling) book on building Shay type loco’s where he descibes how to cut spiral bevel gears on small home equipment? I have tried the local library but to no avail. I would find £60 for the book for a few pages somewhat excesssive.
24 April 2010 at 22:39 #51091
DMB
Participant
@dmb
Hi macmarch,

I bet someone, somewhere, is flogging that book on ebay for much less than £60. Give it a try.

John.
24 April 2010 at 22:45 #51093
Owen
Participant
@owen
I have both of Kozo Hiraoaka’s Shay books and I just looked at them. In both casess he uses stock gears and reworks them to suit. Perhaps it is the Climax book,I don’t have that one.
25 April 2010 at 06:58 #51102
Terryd
Participant
@terryd72465
Off thread slightly but perhaps of historical interest for many of us there is a delightful and very readable book on change wheels for thread cutting on the lathe. It has the very Edwardian style of catchy title i.e.

“The Calculation of Gear Wheels for Screw Cutting Lathes”. By a Mr D de Vries

It is available as an archive resource which is all the better for being free, here:

Gear cutting article.

Sorry to go OT but thought you may like it

Terry

Edited By Terryd on 25/04/2010 06:58:52

Edited By David Clark 1 on 26/04/2010 11:25:41
25 April 2010 at 07:17 #51103
Terryd
Participant
@terryd72465
Posted by John Coleman 1 on 24/04/2010 22:39:12:

Hi macmarch,

I bet someone, somewhere, is flogging that book on ebay for much less than £60. Give it a try.

John.

Hi John,

The cheapest I could find the Kiraoka’ book on the Shay was in the US at £43 including delivery. The one eBay example, also in the Stated was £29 +£22 delivery to the UK (yes Pounds not Dollars)

http://www.discoverlivesteam.com/books/book-right.html#sh

Regards

Terry
25 April 2010 at 10:05 #51108
Paul White 3
Participant
@paulwhite3
Hi, it is in the climax book. Have the book, cut the gears, very satisfying.

Can I help?

Paul.
25 April 2010 at 10:40 #51109
John Stevenson 1
Participant
@johnstevenson1
How to cheat !!

http://www.youtube.com/watch?v=RV8Dq6mslnE

John S.
25 April 2010 at 10:42 #51110
Paul White 3
Participant
@paulwhite3
The other matter I meant to mention is the article on cutting constant depth bevel gears that apeared in model engineer 15Nov 64 , this should help.

Paul.
25 April 2010 at 12:06 #51111
Engine Builder
Participant
@enginebuilder
Thank you for the ref, Paul.

I have a vast collection of ME’s but sadly only one issue from 1964 and its not that one!.

Can anyone scan a copy and email it?
25 April 2010 at 13:34 #51116
Peter G. Shaw
Participant
@peterg-shaw75338
I have found references to making bevel gears in the following:

ME Peter Foyle (20.07.97) & Dave Lammas (10.10.97).

MEW88 & 92 (Feb 03 onwards) Brian Perkins & Jim Whetren MEW 31 (possibly Sep 95 or thereabouts)

At least one of these, the Lammas one I think, is concerned with parallel depth gears.

Regards,

Peter G. Shaw

OK edit no. 1!

Abort the Dave Lammas comment. Iwas thinking of an article by G. Tardrew in ME 18 July 1986 titled Parallel Depth Bevel Gears. The article contains descriptions and calculations.

Edited By Peter G. Shaw on 25/04/2010 13:40:51
25 April 2010 at 13:46 #51118
Engine Builder
Participant
@enginebuilder
Thank for your trouble Peter. I have all the issues you mention and will seek them out.
25 April 2010 at 16:09 #51122
Engine Builder
Participant
@enginebuilder
Peter, I have found the Brian Perkins article and this is the most helpful. He explains the calulations in a manner I can understand and points out an error in th Ivan Law book. I can calclate the gears now, many thanks.
25 April 2010 at 17:07 #51129
Peter G. Shaw
Participant
@peterg-shaw75338
Glad to have been of help.

Good luck with your cutting.

Peter G. Shaw
25 April 2010 at 18:36 #51136
macmarch
Participant
@macmarch
Hi All,

Thankyou for the info. Paul White 3 perhaps you can help, ccan you contact me? (my profile).

cheers all

Ray
25 April 2010 at 18:53 #51137
NEIL SMITH 1
Participant
@neilsmith1
I cut the differential bevels for my 3″ scale Fowler using the parallel depth method,and found the Lammas information to be the most usefull,better than the Law book (imho).The gears meshed surprisingly well. Regards Neil.
27 April 2010 at 21:22 #51201
Sub Mandrel
Participant
@submandrel
What is the error Brian Perkins found? I have cut about eight bevel gears using Ivan Law’s method without problems, all quite small.

Out of curiosity has anyone made a Eureka? I have some 2 1/2″ EN1A and some 1 1/2″ silver steel ready, but he specs EN8. Would EN1A cope (I might only make a couple of cutters a year).

Neil

Edited By Stub Mandrel on 27/04/2010 21:24:17
27 April 2010 at 21:35 #51203
Engine Builder
Participant
@enginebuilder
Hi Neil

Brian Perkins reccons there is a misprint in the formula for calculating the small end dia. If the mating bevels are the same size, ie mitre gears, the error does not affect the calculation.
27 April 2010 at 21:54 #51206
Sub Mandrel
Participant
@submandrel
Thanks EB; all mine have been matched pairs. I’ll make a note in the book.

I made a mistake on the Z-height for one of a few mm and ended up with a skew gear – surprisingly it meshes fine with an ordinary gear, although I haven’t used it.

Neil
27 April 2010 at 22:35 #51208
Francois Meunier
Participant
@francoismeunier96697
Hi

The error in the I. law book is on fig. 80, p106, the formula shows sin instead of cos. As long as the angle is near of 45°, the error is minimal, the gears would run, However for a different angle as in the case of as of a ratio 2/3 (33 and 56&#176 the error will be too great.

The paper of B. Perkins helped me so much, it ‘s really a must before cutting bevel gears.

FMM
27 April 2010 at 23:20 #51211
John Stevenson 1
Participant
@johnstevenson1
Posted by Stub Mandrel on 27/04/2010 21:22:36:

Out of curiosity has anyone made a Eureka? I have some 2 1/2″ EN1A and some 1 1/2″ silver steel ready, but he specs EN8. Would EN1A cope (I might only make a couple of cutters a year).

Neil

Yes, I have made one but scaled it up for full sized 1″ cutters. I made mine out of bright flat but has it all professionally cyanide hardened, works very well and has made many special shaped cutters on it.

Ironically I have never made a gear cutter on it

John S.
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