'66 Sunbeam Minx Project - F20C/6sp/4-link/Discs...

[BlueJeep]

Originally Posted by Frizzle Fry

I don't seem to get shrinkage from grinding. Maybe I use less pressure. I have been taking the welds down to near-surface level with a grinding wheel, then hitting them with the flap disc, then 80 grit DA.

The key to avoiding warpage starts with the weld itself. On thin stuff I tac-tac-tac, jumping around to avoid too much heat in one area. It ends up looking like the steering column pass-through pic in my previous post before grinding. Not the prettiest to look at but it all gets ground smooth anyway.

I believe my warpage likely comes from the welding, as there was very little heat generated by my grinding technique.

I've recenty purchased the ebfabman videos, and tried to use what I saw there. That was, tacks all around about 1" or so apart, then tac, tac, tac...but next to each other not jumping around. I'll try more of the jumping around, is that what you did when creating the tahoe? I'm assuming that since you didn't mention it, you don't hammer and dolly the welds during or after.