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Bevel Gear Cutting

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David Draper04/11/2015 13:05:10
3 forum posts

I am also looking for the way to calculate correct dimensions for making bevel gears and bevel pinions. I cannot find where to purchase " the Climax Book", or the one by Dave Lammas. Can anyone help, or come up with another solution.

Many thanks,

David.

David Draper04/11/2015 13:09:21
3 forum posts

I have not cut Bevel gears or pinions before , so I can use all the help I can Get!!

Roderick Jenkins04/11/2015 17:24:42
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1780 forum posts
459 photos

"Gears and Gear Cutting" by Ivan Law descrbes the method for cutting parallel depth bevel gears.

HTH

Rod

David Draper04/11/2015 17:40:34
3 forum posts

Rlyhanks Rod,

I have this book but there seems to be a fault with the formula, as I can't get it equate properly.

Thor04/11/2015 17:48:20
1129 forum posts
31 photos

Hi David,

I found a few links about cutting bevel gears, may be they can be of help:

***Link***

***Link***

***Link***

 

Thor

 

 

Edited By Thor on 04/11/2015 17:53:53

Ajohnw04/11/2015 17:48:30
3631 forum posts
160 photos

If you search treatise on milling on the internet archive 2 ebooks will be found. One by Cincinati and the other by Brown and Sharp.

Old but gears are gears.

John

-

Roderick Jenkins04/11/2015 18:31:22
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1780 forum posts
459 photos

Neal's used Ivan's methods **LINK**

Perhaps he'll pop up and clarify some issues for you. Bevel Gears are not something I've tried (yet!)

Rod

Nick Hughes04/11/2015 18:43:12
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202 forum posts
130 photos

Page 155 onwards in the B&S:-

**LINK**

Neil Wyatt04/11/2015 18:47:23
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Moderator
16655 forum posts
687 photos
75 articles

Ivan's book has a minor error (SIN and COS swapped over in one formula) that affects the results if you are making an inequal pair of bevels.

I try and look out my corrected copy later.

Neil

Steve Withnell04/11/2015 20:00:03
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794 forum posts
215 photos

I have a spreadsheet  for designing parallel depth gears with the sin / cos error fixed.  I built this a few years back to make some gears for my Stuart Victoria.

The calculations are primarily from the Ivan Laws book,  but then I have another book by Franklin Jones,  which I used to tweak a couple of parameters.

 

This should work for you:

https://www.dropbox.com/s/gkb3w2lfmlig8oa/Gears_Final_180410.xls?dl=0

You do not need to register for dropbox or need a login to access.   The worksheet is previewed,  but there is a "download" button in the top right hand corner of the screen.

Steve

Edited By Steve Withnell on 04/11/2015 20:09:38

Edited By Steve Withnell on 04/11/2015 20:12:30

Old School04/11/2015 20:57:02
259 forum posts
8 photos

I have used Steve's spreadsheet and have cut two sets of unequal bevel gears works a treat. The actual cutting is a bit long winded but it works.

John Alexander Stewart04/11/2015 22:02:29
753 forum posts
51 photos

All - thank you for the email - especially Steve for his spreadsheet. I do have two sets of bevel gears to cut (for a Heisler locomotive) if/when I get to it in my workshop todo list... I do have Ivans book plus a bunch of others, but I like the simplicity of Ivan's parallel depth gear example.

John.

Russell Eberhardt05/11/2015 08:06:26
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2493 forum posts
85 photos

In Ivan's book, page 106, the formula for O/DIA SMALL END change sin to cos. For the large end change cos to sin. It should then work.

Russell.

Douglas Johnston05/11/2015 09:31:02
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628 forum posts
32 photos

In my 1988 edition of Ivan Law's book, both formulae on page 106 use sin, neither using cos. Should both change from sin to cos or just the one for the small end?

Doug

Michael Gilligan05/11/2015 09:45:08
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14131 forum posts
614 photos

Steve and Russell

Many thanks for the useful input.

... I was about to annotate my copy of WP17 accordingly, but then saw Doug's post.

... My 2002 edition [reprinted 2006] also shows Sin in both formulæ

MichaelG.

Brian Wood05/11/2015 11:05:30
1984 forum posts
37 photos

Gentlemen,

If the gear angle remains at 45 degrees for the bevel gear in question, as the example shown on page 106, then cos 45 and sin 45 have identical values of 0.707 [ square root of 2 divided by 2] and the actual term used doesn't matter

I will look and see what my other reference books suggest and report back on bevels having other angles.where the trig function chosen has more influence. It is not difficult to change though since sin x= 1/cos x and vice versa and the values can only vary between 0 and 1.

Brian

Steve Withnell05/11/2015 12:12:34
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794 forum posts
215 photos

I was given a copy of this by an old timer - really good, if only because it has big pictures and clear explanations in big writing

**LINK**

It covers many gear types, when I get chance I'll upload the section on parallel depth bevel gears.

Steve

Michael Gilligan05/11/2015 12:29:40
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14131 forum posts
614 photos
Posted by Steve Withnell on 05/11/2015 12:12:34:

I was given a copy of this by an old timer - really good, if only because it has big pictures and clear explanations in big writing

**LINK**

It covers many gear types, when I get chance I'll upload the section on parallel depth bevel gears.

Steve

.

Thanks, Steve

That looks like just what we need !!

... This may save you some effort

... Not sure if it gives access to all the relevant pages.

MichaelG.

John Stevenson05/11/2015 13:45:52
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Moderator
5068 forum posts
3 photos
Posted by Michael Gilligan on 05/11/2015 12:29:40:
Posted by Steve Withnell on 05/11/2015 12:12:34:

I was given a copy of this by an old timer - really good, if only because it has big pictures and clear explanations in big writing

**LINK**

It covers many gear types, when I get chance I'll upload the section on parallel depth bevel gears.

Steve

.

Thanks, Steve

That looks like just what we need !!

... This may save you some effort

... Not sure if it gives access to all the relevant pages.

MichaelG.

Yes Pages 68, 69 and 70 cover the subject

Neil Wyatt05/11/2015 14:50:20
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Moderator
16655 forum posts
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75 articles

Ok, as far as I know SIN has to be changed to COS in the two upper formulas, not the lower one. This is a scan of the page from my copy with my scribbles on it.

As Rod pointed out, I have produced 2:1 gears using them and the results are shown below.

Neil

bevel book 001.jpg

bevel gears.jpg

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