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Old 02-26-2010, 02:09 PM   #1
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Default Counter Sinking Bit? for TC Chassis

I was after some help with knowing the angle of a counter sinking bit for a drill press. I want to know what angle i need to get to make perfect holes in Xray TC Chassis bottom deck, to match normal screws, thanks
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Old 02-26-2010, 02:17 PM   #2
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for metric m3 screws:
2944A533 (Same as 2944A53)
Coated Solid-Carbide Countersink 1/4" Body Dia, Six-Flute, 90 Degree, Ticn Coat
In stock at $16.74 Each

http://www.mcmaster.com/#countersinks/=5zmzf3
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Old 02-26-2010, 02:43 PM   #3
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I have one that is very similar, but it is cobalt steel instead of carbide. Both will work really well.

-Korey
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Old 02-26-2010, 02:51 PM   #4
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thanks for that, what reference is 90 deg taken from? as 90 deg seems strange.
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Old 02-26-2010, 02:56 PM   #5
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see attached.
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Counter Sinking Bit? for TC Chassis-m3.jpg  
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Old 02-26-2010, 02:59 PM   #6
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Thanks Seaball, you are the best rc guy for help i have ever seen on the internet, period
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Old 02-26-2010, 03:38 PM   #7
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From the 'too much information' archives:

http://en.wikipedia.org/wiki/Countersink
says that metric countersinks are 90deg

http://en.wikipedia.org/wiki/ISO_metric_screw_thread
says that metric threads are 30/60deg (the thread's triangular profile, not the countersink)
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Old 02-26-2010, 03:51 PM   #8
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Your after a 90/45deg tool. I'd use a one flute wood stye Hss tool to keep the chatter down.
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Old 02-26-2010, 04:22 PM   #9
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Dremel actually makes a stone wheel that has a countersink shape. It is actually the best thing I have used for carbon fiber. Probably not the perfect match to the degree, but it must just happen to be very close.
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