After the rotisserie was finished I went after the rust holes in the spare tire well.
After about 3 hours I had one of the suspension mounts off without too much collateral damage.
Only one of the spot weld holes went thru. The trick is to watch the color of the shavings. Generally they'll be a bit of rust between the layers. You'll see just a short blip of brown in the shaving. That's when you've passed thru the first layer.
Click to view attachmentBecause of the tight fit I used a 7/64 HF drill bit to drill thru both layers of each of the spot welds I could see. Because they seam welded after the spot welding, a couple were hard to locate. I drilled some from the inside, some from the outside.
Click to view attachmentGetting the seam welds cut without too much damage was a bitch. Most was done with the air hack saw bent like a noodle.
After taking the guard/guide off. This was after I made a many and as big of cuts as I could make with the air grinder on the mandrel.
I'm always thinking would the time I just spent be worth the money I would be paying or charging ............ three hours to get a part off without damaging the part ?
The problem was exasperated by the fact that there was a spot weld under the seam weld.
Click to view attachmentThis is a shot pre bead blaster cabinet. The mount is solid as a rock. Measured 13 gauge. Was left in the OSPHO pan drying. The metal in the rusted hole gets pretty solid right close to the rusted edge.
The welding in of the patch will determine how I proceed. Completely rosette weld in the 1/4" spot weld cutter holes? Or fill in and drill a new 3/16 holes?