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| Manxmodder:
Hi Norman, it is certainly looking very much like a functional milling machine now. I agree with your sensible choice to use poly V belts for the drive and I wonder if there are any of the propriety brands of carbide inserts that are the correct angle for machining the multiple Vees. What are the angles and dimensions in the info you have obtained?......OZ. |
| NormanV:
Hi Oz, attached is the details that I have found. The groove is 40 degree angle, which unfortunately does not fit any thread gauge. |
| philf:
--- Quote from: Manxmodder on June 20, 2014, 02:32:43 PM ---Hi Norman, it is certainly looking very much like a functional milling machine now. I agree with your sensible choice to use poly V belts for the drive and I wonder if there are any of the propriety brands of carbide inserts that are the correct angle for machining the multiple Vees. What are the angles and dimensions in the info you have obtained?......OZ. --- End quote --- OZ, There was some discussion on Poly V pulleys some time ago. http://madmodder.net/index.php/topic,8306.msg89232.html#msg89232 Carbide inserts are available but for one groove at a time - http://www.premierformtools.co.uk/pdf/EZG24.pdf - I've no idea how much they cost or if they are available in one-offs. I've ground a tool up for J section belts which I've used to machine many Poly V pulleys. It can't generate the radius on the crest of the grooves but that never seems to have caused me any problems. Cheers. Phil. |
| NormanV:
Phil, how did you get the angle correct? |
| Manxmodder:
Cheers for the links Phil, The earlier Madmodder article is really good but would have been really interesting to see how the OP's homemade pulleys turned out. I note that John Stevenson reckons 55 degree tools are ok and the belts will adapt themselves and bed in with use. If that is the case then a 55 deg. threading insert or a 55deg DCMT rhombic style insert would be suitable....OZ. Edit to add link to DCGT 55 degree rhombic inserts best for aluminium turning and available with 0.2- 0.8 mm nose radius. http://www.shop-apt.co.uk/carbide-inserts-for-turning-aluminium-alloys-non-ferrous-metals-plastics/dcgt-11t304-alu-ak10-carbide-inserts-for-turning-ground-and-polished-for-aluminium-uni-tip.html |
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