Die cast parts
Hello all. I am currently buffing some vintage motorcycle parts. These particular parts are Bultaco engine covers, brake backing plates, and triple clamps, levers etc. I am happy with the levers, and triple clamps.
However, both the engine covers, backing plates, and fork sliders are coming out dull. I am sanding w/orbital 150, 320-then 320 wet, 400 wet-then spiral wheel , black, spiral wheel brown-I have not gone to the wht compound yet, as these parts have not yet got a reasonable shine from the first cuts.
Also, as I sand and polish and buff I am exposing some pits-some go all the way through. Are these pcs cast with only a small thickness of solid material on the outside? I have had more success with rough cast parts, which I have smoothed.
Any help appreciated, I'll bet someone else here has buffed some Bultaco parts before.
Thank you, James
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