| Official Luthiers Forum! http://www-.luthiersforum.com/forum/ |
|
| Tapping UHMW polyethylene http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=6160 |
Page 1 of 1 |
| Author: | Terry Stowell [ Fri Apr 14, 2006 1:05 pm ] |
| Post subject: | |
I'm makinf a circle jig for my dremel. On the 2 rails, I'm using an UHMW plastic block, with 1/4" pivot pin underneath in the center. To lock the block to the rails, I intend to use a 10-32 brass bolt, with a little jig knob to lock er down. I assume that UHMW will hold a 10-32 thread sufficient for the task? Maybe 10-24? I might use 1/4" thumbscrews, but prefer brass for the "Dremel tool steel" rods, If ya catch my drift. They're not drill rods. (Too tired to post pix) |
|
| Author: | Miketobey [ Fri Apr 14, 2006 1:39 pm ] |
| Post subject: | |
Fine threads aren't as defined in materials as soft and "flexible" as this material. Unless your UHMW is thicker than 1/4", I would stay with coarse. The fine just won't survive the wear from loosening-tightening like the coarser. That is why one rarely sees fine threads in aluminum unless it is a true hardened alloy like 6061 T6. An insert might not be a bad idea-they have those coarse and deep outer threads and you would have good wear properties. |
|
| Author: | Terry Stowell [ Sat Apr 15, 2006 1:07 am ] |
| Post subject: | |
yeah, pix would've helped, but the hole will be about 3/8" I think. I'll probably just use the 1/4 X 20 thumscrews, albeit gently. This prototype is actually probably going to get little use, as I want to machine one of aluminum like the microfence deal. I don't see myself settling for much less, seeing how easy it is to make one of a high quality |
|
| Author: | TonyKarol [ Sat Apr 15, 2006 1:42 am ] |
| Post subject: | |
The 1/4-20s in my UHMW circle jig have seen a fair bit of use in five years, adn they are still fine. The coarse threads are better. |
|
| Author: | Terry Stowell [ Sun Apr 16, 2006 5:44 am ] |
| Post subject: | |
Yeah, there really is an art to it isn't there. |
|
| Page 1 of 1 | All times are UTC - 5 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|