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Tool Talk Discussion Forum

carbon bits and dowel pins

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Gene Brooks

09-14-2005 17:58:34




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will a carbon bit bore a hole into a solid steel dowel pin? Gene Brooks




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Midwest redneck

09-15-2005 02:26:03




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 Re: carbon bits and dowel pins in reply to Gene Brooks, 09-14-2005 17:58:34  
I have used a TIn coated carbide center cutting endmill with lots of coolant and have got them out that way, the case hardening on dowel pins is real tough.



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Davis In SC

09-14-2005 19:28:40




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 Re: carbon bits and dowel pins in reply to Gene Brooks, 09-14-2005 17:58:34  
No, unless it is a rare soft pin, I have seen a few of them. I deal with broken dowels all the time, usually I EDM them out. I did recently drill out a bunch of 1/8 pins, using a carbide spade drill in a drill that had a 20,000 rpm spindle. Most pins are rock-hard on the surface, & "Tough-hard" inside, way too hard to drill with a high speed steel drill... Is it possible to back drill the other side of the part, so you can drive it out with a punch ???

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Butch(OH)

09-14-2005 19:13:26




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 Re: carbon bits and dowel pins in reply to Gene Brooks, 09-14-2005 17:58:34  
To my knowledge there is no standard hardeness for dowell pins, some are hard some are not depending on the application. Most generaly they are not so hard that they could not be drilled with STD bits. Check the dowell hardness with a good file. If it files easily it will drill easily. If you must push fairly hard to get the file to cut you better buy a cobalt bit before you start the project. If the file screeches across the dowell you need carbide. Most carbide bits are not for hand held equipment, ridged setups only, I.E. drill press and vise.

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NC Wayne

09-14-2005 19:13:19




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 Re: carbon bits and dowel pins in reply to Gene Brooks, 09-14-2005 17:58:34  
Most of the dowel pins I've had experience with are hardened. If that's the case with theione your dealing with then a regular carbon steel bit isn't gonna cut it, you need to step up to a carbide bit. Even then your gonna have a heck of a time drilling it by hand. Personally I'd get several 1/8 carbide tipped masonary bits and try to go through it with them first to give a good pilot hole for the larger bit. If your just trying to get one out you might also try doing it along the lines of how you'd do a broke bolt. Weld you a washer to the protruding end and then weld a nut to the washer. Let it cool down and then thread the end of a slide hammer into the nut. Along with the hammering action you can also apply some twisting action to the nut and hopefully bring the dowel pin out. Good luck.

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Butch(OH)

09-14-2005 19:14:47




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 Re: carbon bits and dowel pins in reply to NC Wayne, 09-14-2005 19:13:19  
sorry Wayne you entered that while I was typing.



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NC Wayne

09-14-2005 19:31:46




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 Re: carbon bits and dowel pins in reply to Butch(OH), 09-14-2005 19:14:47  
They say great minds think alike...LOL



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