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Tool Talk Discussion Forum

Drill bit welding

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R Spence

01-24-2008 19:07:42




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Can I weld a drill bit back together at the shank?
It is a large core drill and barely used.
What would be the procedure?




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shawnspeed3

01-25-2008 10:22:26




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 Re: Drill bit welding in reply to R Spence, 01-24-2008 19:07:42  
Silver solder or brazing would be the perfered method. I make my own lathe and mill cutters all the time with carbide interts sweated with silver solder onto tool steel shanks....Shawn



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M Moline Fan

01-25-2008 09:25:01




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 Re: Drill bit welding in reply to R Spence, 01-24-2008 19:07:42  
I have repaired large drills with bent or broken shanks by boring a hardwood block in a 4 jaw chuck in a lathe til the working end of the drill fits snugly in the block. Weld a new oversize shank on the drill, then insert the drill into the block. Tighten the jaws slightly to grip the drill. Now you can use a center drill and put a true center in the back end of the shank. Use a center in the tailstock to steady the drill and turn the shank to the size you want with many light cuts.

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Kentb of SWMO

01-25-2008 06:01:30




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 Re: Drill bit welding in reply to R Spence, 01-24-2008 19:07:42  
If you weld look at MG Industrys MG 600 welding rod.

Kent



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Catskill Pete

01-24-2008 20:52:54




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 Re: Drill bit welding in reply to R Spence, 01-24-2008 19:07:42  
I have made a couple of long [very long] shaft drills for making ramrod holes building muzzleloading rifles. The easiest and strongest method I have found is to take the two ends of the shafts and grind the sides half way across, creating two flats. Then weld the flats together. Fairly easy to maintain alignment and makes a very strong shaft.



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ldj

01-24-2008 20:41:33




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 Re: Drill bit welding in reply to R Spence, 01-24-2008 19:07:42  
One time I needed a long bit to drill 1/2" hole through 4x4 treated posts at about 45*angle. I took 2 drills and laid them in a piece of angle iron,point of one to shank of other, for alignment. I brazed them together. They held and I still use them from time to time.



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