| Gallery, Projects and General > How do I?? |
| Gear Cutting Help |
| << < (2/3) > >> |
| 75Plus:
Lew, The groove is actually 29 degrees. 14.5 PA. I was wondering if single point cutting would work in this situation. BTW, the bottom flat measures approx. .085" and the top is approx .163". That is about as close as I can measure. Joe |
| Bernd:
Don't want to steel Joe's thunder here so thanks Joe and Don for the info. Going to take a close look at that drill press of his. Bernd |
| Lew_Merrick_PE:
--- Quote from: 75Plus on July 13, 2011, 11:12:42 AM ---Lew, The groove is actually 29 degrees. 14.5 PA. I was wondering if single point cutting would work in this situation. BTW, the bottom flat measures approx. .085" and the top is approx .163". That is about as close as I can measure. --- End quote --- Joe, Engineers such as myself often think in terms of the half-angle of a symmetrical form. An Acme thread has a 29° included angle (14.5° half-angle). If you have access to an Acme thread gage, one end of the gage has a 29° included angle female opening used to compare the sides of an Acme threading tool. The "trick" is that you will need to split that angle on your toolbit such that it lines up with the centerline of your bit accurately. (A miter gage on your grinder will help here.) You mount this in a tool holder (boring bars are the most common ones) that will support the bit perpendicular to your spindle's axis of rotation. This is very like unto single-point cutting of gear teeth. There are several video examples here in this forum and others on YouTube. Light cuts and slow feeds are the order of the day. It is not as solid or effective as a true (expensive) form cutter, but it does work. The mating "teeth" will want to be a (fairly) close slip fit. That is a matter of "touch" in getting things right (assuming you do not have access to form dimensions). |
| Rob.Wilson:
Hi Joe There is a bit on grinding the cutter shape you require here , scroll down a bit ,,,, http://madmodder.net/index.php?topic=2624.100 ,,,,,,,may help Rob |
| 75Plus:
Thanks everyone for the suggestions. Once it became apparent that I would have to single point this project I dug up a grinding fixture that I made a couple of years ago for grinding tools for 60 degree threads. Once I added 14.5 degree lines it worked a treat. As seen in the picture it also has provision for grinding the relief needed. |
| Navigation |
| Message Index |
| Next page |
| Previous page |