Build up welding of a gear tooth.
Build up welding of a gear tooth.
(OP)
Following a tragedy inside my Hino truck gearbox,and a fruitless hunt for parts, I have decided I have no option but to build up-weld the chipped/missing teeth. I was planning to tig weld(after a pre heat) with a filler rod for dissimilar steel that work hardens and is machinable. As welded tensile strength is around 180,000psi. Not sure if gear is case-hardened or fully hardened as one entity. The repairs are quite small and can be welded up in a relatively short time,but Id rather weld a small layer and leave for a while just to keep interpass temps down.
I saw one great idea in another forum regarding machining the teeth to the right profile-he made a 3 sided mold against a healthy part of the gear and poured molten lead in there which gave him a perfect copy of the teeth he needed to match.I can see this part of the job taking a bit of time and engineers blue.
If any of you guys can share any experiences or other suggestions Id love to hear from you.Thanks in advance.
I saw one great idea in another forum regarding machining the teeth to the right profile-he made a 3 sided mold against a healthy part of the gear and poured molten lead in there which gave him a perfect copy of the teeth he needed to match.I can see this part of the job taking a bit of time and engineers blue.
If any of you guys can share any experiences or other suggestions Id love to hear from you.Thanks in advance.





RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
http://www.FerrellEngineering.com
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
Somehow - get a NEW gear. Find it or have re-made.
BTW - what is a Hino?? A neutered Rhino??
RE: Build up welding of a gear tooth.
Best regards - Al
RE: Build up welding of a gear tooth.
Hino Trucks part of Toyota.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
I'll keep you posted how it all goes,thanks.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
Disregard all of the internet blacksmiths amd self-styled metallurgists who may claim there is a miracle cure for damaged gears.
RE: Build up welding of a gear tooth.
Thanks for all your input,Im a happy camper.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
RE: Build up welding of a gear tooth.
Now say you get past this now you have to machine the involute in a helical gear. You could take the gear to a gear shop and have them grind the involute.
Go ahead try your best and then either have a gear made or find a used transmission overseas or just scrap the truck.
Gear shops invest millions of dollars for gear hobs, gear shavers, gear shapers, ID and OD grinders and inspection equipment.
I am sure you can hand produce a usable gear without any equipment.
RE: Build up welding of a gear tooth.