Cutting Bevel Gears

[TerrydParticipant @terryd72465]

Enginebuilder,

 

I have the Nov 1964 article by RS Minchin if you are still interested, it is in pdf format and mentions other articles which I could scan and send if needed.

 

Let me know if you would like me to send it.

 

Terry D

[Engine BuilderParticipant @enginebuilder]

Thanks for the offer Terry but I have aready been sent a copy of the article.

David

[Sub MandrelParticipant @submandrel]

Just done the calculations for a pair of 2:1 bevel gears.

 

Sorted the sin/cos confusion before remembering thsi thread and now my brain hurts.

 

As sin 45 = cos 45 it doesn’t affect his example or the 1:1 gears I’ve cut.

 

The sin in the calculation for cutter offset is correct however.

 

This weekend I’ll have a try – two gears 50 ansd 25 teeth at 80dp. Watchmaker’s stuff!

 

Neil

[John OlsenParticipant @johnolsen79199]

Well, this is a very opportune thread since I want to make a few tiny bevel gears, using some 0.5 module cutters that I have. So I will dig out the articles referred to.

 

Just a mnor suggestion, when referring to back issues of ME, if you happen to know the  volume and issue numbers, that is generally the most usable reference to use. Of course, if you don’t know this, it is no big deal to look it up.

 

regards

John

 

[Sub MandrelParticipant @submandrel]

Well I thought i would have finished the first gear by now, I’ve done the cutters.

 

But I went and did an extra turn on the dividing head, see if you can spot the thin tooth before I spotted the error – just 5 cuts from complete!

 

It’s a bit wee isn’t it/

 

Neil

[Engine BuilderParticipant @enginebuilder]

I found this Book very useful for calculating the bevel gears.

 

I found it easier to understand than other data. No need to buy the book if you click on contents you can read it on line.

David

Edited By Engine Builder on 16/10/2010 21:46:58

[Anonymous]

I’ll second the book recommendation; good practical advice. I first used it in 1976 when designing bevel gears as part of a pre-university design and build project. Been referring to it on and off ever since.

 

Regards,

 

Andrew

[Steve WithnellParticipant @stevewithnell34426]

I have built an excel spreadsheet for designing bevel gears,  the various formulae being taken from Ivan Laws book  + an much older book by Franklin Jones.  Reference in the spreadsheet:

 

http://www.btinternet.com/~steve.withnell/lathe/gears.xls

 

and here is my blogged article on the gears I made for my Victoria:

 

http://stevewithnell.wordpress.com/author/stevewithnell/page/3/

 

hopefully it all makes sense!

 

 Best Regards

 

Steve

 

[Steve WithnellParticipant @stevewithnell34426]

Should have said “parallel depth method”  !!!

 

Steve 

[Steve WithnellParticipant @stevewithnell34426]

Posted by Engine Builder on 16/10/2010 21:41:11:

I found this Book very useful for calculating the bevel gears.

 

I found it easier to understand than other data. No need to buy the book if you click on contents you can read it on line.

David

Edited By Engine Builder on 16/10/2010 21:46:58

 

This is the text I used to calculate the face width in the spreadsheet.   I was given a hardback version by an old timer last year and it’s a very clear explanation of the parallel depth method. 

 

Steve 

[DMBParticipant @dmb]

Hi Macmarch,

Just had another look at various postings and dont understand your comment about having tried local library since they have to get what you ask for and charge a capped amount for postage. Having said that I went to Brighton Central Library, aka The Jubilee Library which keeps boasting about how wonderful they are and they refused my request on the grounds of the book being spiral bound and unsuitable for lending.

I have never been back. If I was ever rather more keen to get hold of a book, I think that I would write a snail mail letter of complaint to the `Big One` in `the smoke.`

BTW, do you still need the 1964 ME article emailed to you?

John. 

[Sub MandrelParticipant @submandrel]

For the record, here are the finished bevel gears and the crankshaft they work with. With 50 ans 25 teeth they will drive a governor sped up 2:1. They are 80DP and the small gear is the size of my little fingernail.

 

Neil

 

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