Excellent job of rebuilding gear teeth

[California]

This tells the story. 3000 ft of drill rod stuck down the hole when the drive gears stripped.
Guy welded replacement teeth sufficient to get the rod out of the ground.

Followup, completed.

https://www.reddit.com/r/Justrolledintotheshop/comments/1fy96ej/update_mangled_gear_rolled_back_out_saturday

Initial post describing the problem

https://www.reddit.com/r/Justrolledintotheshop/comments/1fwba89/this_gear_rolled_in_today_customer_wants_us_to

 

[mrmikey]

That guy deserves a raise.

 

[Thomas]

Indeed and artist.

 

[lostcause]

pretty neat stuff... I read through a lot of the comments, and I'm amazed at how many people who act like industry professionals "would never touch a job like that". I will say with absolute honesty that I am NOT a professional, and I have been asked to do "less than professional" repairs before for others. the thing people can't seem to understand is that when you have a machine down, you are not making any money to pay the bills, employee wages, benefits, etc. You can't just say: "sorry guys, go home and don't expect to get paid until i can fix this in by the cleanest method possible. In the meantime I won't be finishing any jobs, starting any new jobs, and my customers may go elsewhere when I can't perform to schedule." Business owners know that you don't make money when you aren't working, and they need to keep the equipment running as many hours a day as possible. I have made and repaired parts before (much smaller than that gear) at a cost equal to or higher, and of lesser quality than OEM just to eliminate downtime.

 

[California]

...when you have a machine down, you are not making any money to pay the bills, employee wages, benefits, etc. You can't just say: "sorry guys, go home and don't expect to get paid until i can fix this ... and my customers may go elsewhere

Amen bro!

I have made and repaired parts before (much smaller than that gear) ... just to eliminate downtime.

Here's a hitch adapter I put together adding a HF 4-wheeler receiver to a 1.25" ball mount. Instead of driving all around to find one, or ordering online. Yeah I'm impatient.

Having a welder is essential for farm repairs and projects like this.

 

[Sodo]

Feller watched too many Youtubes of barefooted welders in India repairing heavy-truck ring & pinions with a stick welder and an angle-grinder.

What I want to know is, how long does that truck operate after the repair?

And is the truck able to make a profit for the owner; that at least exceeds the cost/effort of the repair? You do have to wonder how a guy could become so skilled in that repair method, if the repair didn't actually last "long enough".

===============

That gear repair was ideal with an un-worn section of the tooth for a pattern.
They made a plywood template from the good teeth and used it to shape the repair teeth.

Spacering that gear over to gain full tooth engagement would increase the strength some %.

pretty neat stuff... I read through a lot of the comments, and I'm amazed at how many people who act like industry professionals "would never touch a job like that".

OK I went and read thru a lot of comments too. So many acting like industry professionals who don't know what they are typing about. Of 651 comments there has to be HUNDREDS of pretend-expert comments. I'm no expert either but I can see a lot of posers. Thousands of vacuous thumbsups on pretend-comments. One guy writes that the bore will be warped and gets 77 up-arrows and not a single down-arrow.

 

[etpm]

I saw that weld repair and the reason behind it and thought that it was just fine. I'm a retired self employed machinist and I did emergency jobs similar to that gear repair. Nobody was fooled into thinking the repair was permanent. And I was truly impressed with the shaping of the teeth after the welding was done. It was probably good enough to avoid damaging the mating gear if it was still any good.
Eric

 

[California]

Yeah. The repair lasted long enough to get a half mile of drill rod back up out of the hole.

That's all that mattered.

 

[Sodo]

Who wants to bet that it would lasted a lot longer than that?

Look at the "before" pic.
How long ago was it worn "halfway" to the stripped state?

I didn't see any grease on it. How long would it last with lubrication?