- Joined
- Mar 26, 2018
- Messages
- 2,724
Hi All,
I've been working on a PM #6 engine for a buddy for a while now and I just made a big screw up. The frame has a bolt hole circle but the holes are not evenly distributed. I misread the print and drilled them evenly distributed. I need to redrill the holes in the correct spot, but the correct location overlaps the drilled location by about 50%
My current repair plan was to turn some cast iron pins (just bought cast iron bar stock) that are on size with the hole and press them in with some Loctite green bearing retaining compound. I'd then let it cure and drill the holes in the correct position, machining some of the base metal and some of the new pin. These are clearance holes so the loads should be low. When I'm done, I'll either machine or sand the face flat with the hope that the new pins are nearly invisible.
Does this sound reasonable. I'm planning on turning the pins onsize with the hole for a light press rather than risking cracking the casting with a tight press fit. The holes were drilled 7/32 with a twist drill so I'll have to play with the fit to get it right. Two of the holes are 1.5" deep so that is not going to be the most fun to press a pin into.
-Mike
I've been working on a PM #6 engine for a buddy for a while now and I just made a big screw up. The frame has a bolt hole circle but the holes are not evenly distributed. I misread the print and drilled them evenly distributed. I need to redrill the holes in the correct spot, but the correct location overlaps the drilled location by about 50%
My current repair plan was to turn some cast iron pins (just bought cast iron bar stock) that are on size with the hole and press them in with some Loctite green bearing retaining compound. I'd then let it cure and drill the holes in the correct position, machining some of the base metal and some of the new pin. These are clearance holes so the loads should be low. When I'm done, I'll either machine or sand the face flat with the hope that the new pins are nearly invisible.
Does this sound reasonable. I'm planning on turning the pins onsize with the hole for a light press rather than risking cracking the casting with a tight press fit. The holes were drilled 7/32 with a twist drill so I'll have to play with the fit to get it right. Two of the holes are 1.5" deep so that is not going to be the most fun to press a pin into.
-Mike