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#1
September 22nd 2006, 05:58
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In the aircraft business the term counter sink and spot face are totally different . A spot face is a flat seat , and a countersink is a beveled hole for a flush fastener .
See ya , Steve
__________________
Cheers , Steve Well it is part VW... 
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#2
September 22nd 2006, 08:14
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zeroaxe,
Yeah, you've got the procedure correct. Brad_gt, You're right. Spotface is when the machining is perpendicular to the hole. Countersink is for flat head screws or rivets, so that the fastener is not above the surface. The holes on rotors for the disk-retaining screws on most cars are countesunk holes.
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#4
September 22nd 2006, 11:47
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Flat,
Thank for the ocnfirmation. I will note this down in my 'tech book'  Brad_gt, Yes, sorry, I should've clarified myself. Countersink is done with a normal 45° drill bit. It has been confirmed by Flat, and elsewhere with a picture about the webbing problem at the back of the hub/disc. So the tapping idea will probably be scrapped. I guess I would just have to make up my mind and stick with Porsche pattern  No wheel swapping here anymore...I appreciate the input from everyone. Anyone know where a jig can be had from? Thanks!
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#5
September 22nd 2006, 12:22
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Any good machine shop can make a jig. Give them a drum, or rotor, and have them make the jig bolt to the current bolt pattern. Then tell them the hole size, and the dia. circle, and number of holes. The mill I have here at work has a DRO(digital read out) that has a program on it that figures the hole spacing by just giving it the circle dia. and hole size, and number of holes
 . I know this doesn't help you, but it gives you an idea to find someone across the pond to do it... even if their mill doesn't have DRO.
__________________
1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 1962 SC 1776cc SP 944NA brakes, 993 wheels VKG
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#6
September 22nd 2006, 16:10
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Hmmm, I will take over a drum (lug it on my motorcycle there) and ask some questions. What are the popular CNC files it can read? CAD?
And no, your fancy-shmancy DRO machine at work doesnt help me!!! Lol 
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#7
September 22nd 2006, 20:51
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Yes, the DRO can upload CAD, AUTO CAD, and Solid Works... more fancy-schmancy stuff
.
__________________
1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans 1962 SC 1776cc SP 944NA brakes, 993 wheels VKG
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