Bevel Gear Cutting

[David DraperParticipant @daviddraper19658]

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 DraperParticipant @daviddraper19658]

[David DraperParticipant @daviddraper19658]

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

[Roderick JenkinsParticipant @roderickjenkins93242]

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

HTH

Rod

[David DraperParticipant @daviddraper19658]

Rlyhanks Rod,

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

[Thor 🇳🇴Participant @thor]

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

[AjohnwParticipant @ajohnw51620]

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 JenkinsParticipant @roderickjenkins93242]

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 HughesParticipant @nickhughes97026]

Page 155 onwards in the B&S:-

**LINK**

[Neil WyattModerator @neilwyatt]

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 WithnellParticipant @stevewithnell34426]

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 SchoolParticipant @oldschool]

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.

[Another JohnSParticipant @anotherjohns]

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 EberhardtParticipant @russelleberhardt48058]

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 JohnstonParticipant @douglasjohnston98463]

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 GilliganParticipant @michaelgilligan61133]

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 WoodParticipant @brianwood45127]

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 WithnellParticipant @stevewithnell34426]

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 GilliganParticipant @michaelgilligan61133]

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 Stevenson 1Participant @johnstevenson1]

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 WyattModerator @neilwyatt]

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Stevenson on 05/11/2015 13:45:52:

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

MichaelG.

Yes Pages 68, 69 and 70 cover the subject

.

Thanks for the confirmation, John

I posted whilst on the 'bus, using an iPod Touch; so was struggling a bit.

MichaelG.

[Steve WithnellParticipant @stevewithnell34426]

Thanks Michael for saving me scanning the book!

These are the gears I cut for the Victoria using the parallel depth method.

**LINK**

Regards

Steve

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by Douglas Johnston on 05/11/2015 09:31:02:

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

Sorry, it's the old eyesight failing. My copy of the book has exactly the same scribbles as Neils. Both formulae should use cos.

Russell.

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