The Home Machinist!

I got the part back today. He welded the hole then used a helicoil. I asked the thread size and he said 7/16-20. I unscrewed the guide pin and it felt snug and smooth. If it really isn't 7/16-20 and it is metric then it is too close to see any difference. I guess I have to take his word for it .

ctwo wrote: ↑Tue Jun 14, 2022 4:30 pm Braze the holes?

I'm not sure how they will do it but I have some faith in their work. The shop has been around for 70 years, the company I work for uses them.

My error. After a bit more searching, I found that there is indeed a M11x1.25 thread. 11mm = .433" diameter: 7/16 = .4375 " diameter: 11mm is smaller by .004" 1.25mm = .0492" pitch: 20TPI = .05" pitch: 1.25mm is smaller by .0008" So the two threads should be NEARLY int...

That's this car. Metric and standard all over.
The part is at the welders now. We wil see what happens

Or maybe a helicoil could be found..? I found a helicoil but the hole is too large. I'd have to helicoil a helicoil. Plus I'm still not 100% sure of the thread size Are other fasteners on the caliper metric or imperialist? A helicoil would be the best, but finding one for that thread would be a mir...

I found something called threaded weld washers. If I had a welding machine I would go that route. Looks like the easiest fix, sort of what you mentioned about the donut.

It's an 81 pontiac
I was reading that drilling weld and tapping it could be difficult because it heats up fast and then cools down and hardens. Hopefully this will be done at the welders,,they offer a ton of services so I have some faith in them

I've been meaning to take it to home depot and thread it into their thread checking plate. I have had 7/16-20 hardware floating around as I save nuts and bolts,but I moved and got rid of tons of stuff.
The die felt like it wanted to cut new threads, really tough to start.

Thanks for the help guys. Tomorrow I'm going to take the part to a welder to see if he can fill the hole and then drill and tap them. Hopefully he can match the thread up, I wanted to give him as much info as possible. If not I'll let him weld them up and then I will buy a metric gauge and try doing...

I'm trying to identify the thread size in a gm brake caliper pin. I've asked the manufacturer and they won't tell me. Other manufacturers don't respond and the thread size isn't listed anywhere. Using digital calipers on the diameter I get inch=.430 (7/16?). On metric I get 10.94 (11mm?). A "la...

If my pc was up and running maybe i could have spent more time with the excel. Im doing everything off my phone and im very limited. Im not a tech person. As far as the part goes, i never attempted something like this,,,to make an accurate copy. I'll see if i can get some similar sheet metal and use...

Thanks for the program but i ended up using masking tape. I thought it would stretch when taking it off but it worked well. I burnished the edges and that gave me a good outline. Then i cut/tore the scrap away, peeled it off and stuck it on thicker paper.