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Tool Talk Discussion Forum

drill bit

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DJM75

01-22-2006 13:46:48




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whats the hardest bits you guys know of? I have a pin I have to drill and it seems very hard ruined several cheap bits and didn"t make a dent in the pin.




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DJM75

01-23-2006 14:43:22




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
Thanks for all the help guys it is a blind hole in a cast iron piece and I think they just drove a harden pin in.thanks again



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Fred Martin

01-23-2006 13:46:16




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
Might need some help on this one...there used to be a straight fluted drill that was so hard you ran it fast and the friction of the cut annealed the metal and it kinda wiped it out as it went....kinda like friction sawing. Any of you older machinists know of or remember this one? I don"t think it was a straight fluted drill tipped with tungsten carbide cause the heat would melt the silver solder. Fred OH

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midwest redneck

01-23-2006 13:31:14




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
Get solid carbide bits, expensive but tougher then anything.



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Adam2

01-23-2006 09:23:28




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
This is a high-end, nothing else works, don't want to damage surrounding machinery, can take the part off to get into a 10 gallon fish-tank sized machine tub of dielectric fluid.

If your project warrants the cost, or you've got a machinist buddy, an Electrical Discharge Machine (EDM) will slowly cut through anything that conducts electricity.



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petetx

01-22-2006 20:16:43




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
get a tungsten carbide bit expensive but save the aggravation old machinist.



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MikeCatthemuseum

01-22-2006 17:43:26




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
If this is a hardened pin (and it sounds like it to me), HSS in any form or fashion isn't going to cut it.. literally. Cobalt will probably be a waste of time as well. You need a solid carbide or carbide insert drill.

I broke the head off a drive screw in a blind hole on a machine I was restoring. After quickly realizing that the piece of steel in that hole was harder than any drill bit of tap I had seen, I started scrounging around in some surplus stuff I bought and found a carbide tipped 1/8" bit. It was not easy, but that finally got it out.

As has been suggested, run slow.. variable speed drill is very good for this, but with a small bit, 1000rpm would be plenty slow enough. Good luck wih it.

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Ol Chief

01-22-2006 16:33:08




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
I have no idea where or what you are working on ,but if is in a practical location where heat will not do any damage ,heat the broken piece red hot and cool very slowly to anneal the part. If it's broken off in cast iron forget heat ,the part will probably pull carbon from the cast iron and reman very hard.In any event,you can obtain a solid carboly drill bit at most mine and mill supply houses or machinery suppliers.I suggest you consult Machinery Hand Book for suggestions on coolants and drill speed.I have used this proceedure several times.Always with success.Be prepared for sticker shock.I paid $27.00 for a one quarter inch bit but considered it worth the money. Good Luck ,Ol Chief

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Slowpoke

01-22-2006 16:21:48




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
If it's a dowel pin, can you punch it out from the backside? Is it threaded in the hole? If it is, weld a nut to it and try to turn it out. Or try a stud remover. More information on the project would help.



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Ol Chief

01-22-2006 16:02:33




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
I have no idea where or what you are working on ,but if is in a practical location where heat will not do any damage ,heat the broken piece red hot and cool very slowly to anneal the part. If it's broken off in cast iron forget heat ,the part will probably pull carbon from the cast iron and reman very hard.In any event,you can obtain a solid carboly drill bit at most mine and mill supply houses or machinery suppliers.I suggest you consult Machinery Hand Book for suggestions on coolants and drill speed.I have used this proceedure several times.Always with success.Be prepared for sticker shock.I paid $27.00 for a one quarter inch bit but considered it worth the money. Good Luck ,Ol Chief

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big fred

01-22-2006 14:43:03




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
A sharp HSS bit, slow speed and plenty of coolant and you should be able to drill just about anything. I'm guessing the ingredient you are missing is slow speed. Is there any way you can jerry-rig an additional stage of reduction on your drill press?



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Eric in Il

01-22-2006 14:27:24




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
Will a good sharp file cut any shavings from the pin? If so, a good High Speed Steel bit should work with proper r.p.m. If not, I would get a solid carbide bit.

Sharpening/ thinning of the web on drill will also play a big part in drilling or not drilling. The carbide bit will need a silicon-carbide or diamond grinding wheel to be sharpened.



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Chris(WA)

01-22-2006 14:04:49




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 Re: drill bit in reply to DJM75, 01-22-2006 13:46:48  
The titanium coated(gold colored) bits work pretty good until you wear thru the coating then they are junk. Cobalt bits work real good but are expensive. If the pin is that hard I would have to concider blowing it out with a torch.



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