Good morning everyone. I purchased an old HW70 and have run into a problem. The sear is broken.It appears to be stamped steel. Not sure if this could be welded and reshaped or if a new piece could be made. I would rather pay someone to make one than try to fix this one.I have seen some threads in the past of people offering machine work, I hope this is the right place.
Quote from: mikeyb on January 07, 2024, 02:09:56 PMI don't think anything other than steel with some case hardening will be strong enough to work.3mm is closer to 1/8" (0.118" = 3mm). A piece of 3/16" (4.76mm) steel could work but does it fit inside trigger group frame? Will 3/16" fit with trigger blade and in piston latch area?I don't have an HW70 to measure so I'm just asking :-)I have a TIG welding setup (hobby welder) and am actually getting pretty good at it. I might be able to build up that area of the original sear with a tool steel (hardenable) filler alloy.NO charge for materials/labor. Return postage maybe, but only if repair is verified successful.PM if you (Kurt or Francois) want to discuss :-)It sounds like they prefer to turn a simple weld repair into a major project. I could build that up with oxy acetalyne in 15 minutes. Trim it up and case harden it within the hour.See how it wore off? It probably wasn't even hardened.
I don't think anything other than steel with some case hardening will be strong enough to work.3mm is closer to 1/8" (0.118" = 3mm). A piece of 3/16" (4.76mm) steel could work but does it fit inside trigger group frame? Will 3/16" fit with trigger blade and in piston latch area?I don't have an HW70 to measure so I'm just asking :-)I have a TIG welding setup (hobby welder) and am actually getting pretty good at it. I might be able to build up that area of the original sear with a tool steel (hardenable) filler alloy.NO charge for materials/labor. Return postage maybe, but only if repair is verified successful.PM if you (Kurt or Francois) want to discuss :-)
If I were going to Tig weld it I would bring the whole piece up to temp first. If not it will become brittle and break off where it was welded. I would fire up my casting pot with lead in it and let that piece soak in it for several minutes. After welding I would let it cool and grind it in.My experience comes from 12 years as a die technician for a Honda supplier repairing chips in the trim line details on stamping dies. We would heat the details in and oven for large repairs or use a rose bud for minor repairs. If we didn't do it that way it would chip back out in a short time.. often worse than it was.But that's just how I would do it.
“It sounds like they prefer to turn a simple weld repair into a major project. I could build that up with oxy acetalyne in 15 minutes. Trim it up and case harden it within the hour.See how it wore off? It probably wasn't even hardened.”+1