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Tool Talk Discussion Forum

Drilling or welding a hardened steel shaft

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Gwiz

07-10-2006 15:28:46




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I added a slip clutch in the driveline of by bushhog, so I cut 4+ inches off the 1 inch square shaft. Then when I tried to drill a new hole in the shaft, I realized it's hardened steel. I either need to drill a 3/8 in hole through the shaft to hold the yoke on the end, or weld the cast iron yoke to the shaft. What do I do?????
I have a wire feed welder, but have never welded cast. Thanks,
James

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KeithF

07-12-2006 10:34:11




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
I have drilled holes in case hardened shafts before. Most are hard about an eighth inch or less from the surface. I used a Dremel tool stone to grind into the surface at the location where the hole would be. I then would take a small diameter high speed drill bit and try drilling a hole. If it was still too hard I would grind some more until it would start penetrating. This takes some patience, but it will work. It also requires sharpening the drill bits as they get dull and use a good coolant. Once a hole is drilled through it is easier to enlarge the hole to the correct size as it does not have to cut the center out.

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Fred Martin

07-12-2006 08:37:00




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
The shaft is toughened up...it is not too hard or it would be brittle when something is hit with the mower, it would shatter. I would go to the local hardware store and get a masonary bit and use that. I wouldn"t get it too hot or it might melt the silver solder holding the carbide to the shank. Use a coolant or oil and probably not over 400 rpm for a 3/8" drill....and it is not advisable to use a masonary drill in a hand electric drill for drilling steel...use a drill press if you can. Fred OH

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Gwiz

07-11-2006 16:31:42




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
I bought a cobalt bit today, and it took out a few spiral shavings, then stopped. I can't seem to get drilled in past the surface. It was the same on the other side, I took out a few shavings with a HSS bit, but when I get to where the whole bit it trying to cut, it stops. Seems to roll the cutting edge of the bit down. Thanks for your suggestions.
James



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Nebraska Kirk

07-11-2006 12:13:48




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
You can weld the yoke to the shaft. The yoke is forged steel, not cast.



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Joe(TX)

07-11-2006 05:33:59




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
Try heating the spot you want to drill until it is cherry red and the let it cool slowly. This works on casehardened shafts. Use a cobalt or carbide drill.



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Ryan - WI

07-10-2006 20:26:44




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
Hindsight is 20/20 and all but wouldn't it have been better to pull the whole end out and cut the length of the end that didn't have the yolk on it?



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Midwest redneck

07-10-2006 15:58:03




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 Re: Drilling or welding a hardened steel shaft in reply to Gwiz, 07-10-2006 15:28:46  
If the steel shaft can be filed then it is only semi-hard, like maybe 40Rc. 40Rc heattreated steel can be drilled into with High speed steel tooling. Use a center drill on a bridgeport and then low speed and feed for the drilled hole. Or use a carbide drill and carbide center drill.



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Davis In SC

07-10-2006 19:07:56




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 Re: Drilling or welding a hardened steel shaft in reply to Midwest redneck, 07-10-2006 15:58:03  
It might just be Induction, or Case Hardened. If so, once you break through the hardened surface, drilling should be much easier.



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