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Old 04-10-2004, 04:10 AM   #1
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Default countersinking: what Dremel tools to use?

Which Dremel tools have the right angle when I want to countersink screwholes?
For instance like at the bottow of a chassis????

Thanks.

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Pizza (with holes)
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Old 04-10-2004, 01:21 PM   #2
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Dremel sells a bit, think it's meant to be used as router bit, but the angle on it is super close for flat head 4-40 screws. It's 2 flute, think on packaging it says 1/4" for diameter.
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Old 04-10-2004, 01:52 PM   #3
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does anyone know what threads and size is it for a set screw, a pinion screw, that one, i'm making a custom allen wrench driver, and i need to know what screw to use. Look at a dynamite wrench if you have questions.
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Old 04-10-2004, 02:03 PM   #4
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Usually it is a 4-40 which uses a .050 wrench.
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Old 04-10-2004, 06:32 PM   #5
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Quote:
Originally posted by pro3racer
does anyone know what threads and size is it for a set screw, a pinion screw, that one, i'm making a custom allen wrench driver, and i need to know what screw to use. Look at a dynamite wrench if you have questions.
Regular pinions use .050, Robinson Racing Pinions use 1/16.
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Old 04-10-2004, 09:31 PM   #6
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4-40 is the .050" wrench, 5-40 is for 1/16" wrench
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Old 04-10-2004, 09:33 PM   #7
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Thanks guys, that helped, i'll have pics of when it's done. It sucks, i don't know how to use a cnc lathe/mill yet(taking a class next year), so i have to make the whole thing by hand with a lathe and a drill press.
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Old 04-10-2004, 10:10 PM   #8
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buy one for your cordless drill if you have one it works better since you have more control of the drill then a dremel
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Old 04-11-2004, 12:11 AM   #9
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Quote:
Originally posted by SlobbaTech
Dremel sells a bit, think it's meant to be used as router bit, but the angle on it is super close for flat head 4-40 screws. It's 2 flute, think on packaging it says 1/4" for diameter.

Slobba or anyone,

Do you have a partnumber for me?
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Old 04-11-2004, 12:07 PM   #10
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#640

http://www.dremel.com/html/home_fr.html

Better to use drill press over dremel for better control (mainly speed and with dremel sometimes the material takes heat from going too fast rpm then bits want to pull themselves into it drilling/sanding further than you wanted and that's not a good feeling) or drill unless you need to use hand tool to be able to do whatever comfortably.
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Old 04-12-2004, 02:25 AM   #11
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If it's for a chassis, I assume it's a carbon chassis, right ? In this case, I wouldn't use this dremel tool, it's not hard enough and will just wear very fast.

I recommend using a drill with a 90 end, better if it's a tungsten carbide or anything similar. For M3 holes, a 10mm drill works just fine.
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Old 04-12-2004, 02:29 AM   #12
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Default hand tool

you can buy a hand counter sinking tool that will work heaps better then a high spining version cheap as too.
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Old 04-12-2004, 03:21 AM   #13
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A conical grinding stone with a rounded tip works for me. I was able to create countersunk screw holes on CF chassis with plenty of control. Trial and error until a sample screw is just about flush with the chassis.

This was for about 8 holes only, the stone showed no sign of wear. You might need more than one stone.
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