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Re: What's a good hollow chisel mortise chisel?

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Post by Ed in Tampa » Fri Mar 18, 1:57 pm

If you want to learn more, please visit our website Chisel Bit(be,da,de).

I don't have any mortisers but I know they take above average pressure. If you look at standalone mortisers they are built more like bearing presses than drills. They have about 2 ft handles and a gear rack about twice that is on the SS quil feed.

Personally I would not use my Shopsmith to cut mortises.

I rout my mortises or hand chisel them.

Always use the aux legs if you are going to do mortises on the Shopsmith.

If you have the time and energy to try welding this back together, try it. The only thing you might loose is your time and the cost of a welding rod. Arc welding will probably have the highest chance of success if you can get a good welding rod match. You see arc welding in the field for the repair of bulldozer blades and backhoe shovels all the time. Same basic steel arrangement- The body of the drill should be a "tough" steel to deal with the loads of drilling. The front cutting edges should be hardened steel to deal with hitting the concrete. So you should be able to weld the body of the bit together with more success. But welding produces harder material in general which is brittle, so the bit will likely break at the weld in the future. You can increase your success by changing the steel in the weld zone with follow up heat and cool. But local to the weld zone, not the hardened tip. Heating and cooling the tip will soften that steel and make the bit dull very fast. What exactly is needed is anybody's guess. You would really need to talk to a materials engineer who is versed in steel to find the right temperature to heat to (which is the key), then cool fast in water.
Alternately You can try hammering the weld with a ball peen to toughen it and reduce some of the stresses. Which is part of the arc welding cleanup, so that's another reason to use arc welding.
FYI, this is my 1st post on the forum. But I have a BSEE, and one materials engineering course, and my brother has a MSME in materials, so I do know a little about the subject.