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| Photos of gear cutter form tool. |
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| Lew_Merrick_PE:
John Stevenson's approach is rather interesting. The diameter, angle, and spacing of the "pins" create nominally elliptical forms to approximate the involute. While an AGMA inspector would be horrified, it ought to create reasonably good gearing. I will have to think on it. Anyone playing with gears really ought to get a copy of the Stock Drive Products -- Sterling Instruments (SDP/SI) Handbook of Gears at http://www.sdp-si.com/. |
| RichardShute:
--- Quote from: Lew_Merrick_PE on January 07, 2011, 11:57:05 AM ---John Stevenson's approach is rather interesting. The diameter, angle, and spacing of the "pins" create nominally elliptical forms to approximate the involute. While an AGMA inspector would be horrified, it ought to create reasonably good gearing. --- End quote --- Lew, have a look at this thread, it's an excellent description of the scheme: http://bbs.homeshopmachinist.net/showthread.php?t=41591 John Stevenson's drawings for comparison with a true involute assume a circular button profile and the error is remarkably small. Arithmetically, you are quite correct regarding the elipse, but the eccentricity goes 'the wrong way' so slightly diminishes the accuracy rather than improving it. That said Cos (clearance angle) is so near to 1 as to be of no practical consequence. Richard |
| raynerd:
:coffee: I can`t imagine a AGMA inspector will be checking my Webster IC engine :lol: |
| Rob.Wilson:
Hi Chris I have made a good few gear cutters using the button method , single and multi toothed ,, easy to do and CHEAP :med: most of all FUN :D Rob Here is a gear chart that may come in handy .. i keep it handy in the shop . http://www.mediafire.com/file/grnityxwny0/Technical%20data%20sheet%20gears....pdf |
| raynerd:
Rob, really sorry, I totally missed this post which is why I never replied! Thanks for the images, you have totally made my night!! I have just got back from the workshop gutted, thinking that my buttons looked too close and I`d mucked up the calculation, but looking at your far right image I think I`m OK! I`ll harden the buttons tomorrow and then will hopefully have a go cutting later in the week. What is the object far left? Chris |
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