Our latest attempt to cut sandblast on our SB turned good. I thought some of you might be interested.
We applied the mask directly to the primed HDU, chose a small 1/8" roundover bit. We picked this bit as it had a tiny tip. Perviously we had used a 60 degree V bit which failed on Anchor mask but did well on Hartco Sandblast material.
Hartco is a vinyl material, that holds up very well under the blaster. The edges of the mask looked a little rough at the end of routing, but once the panels were blasted the letters were very, very sharp and clean.
Our compressor is an electric, 50hp, Quincy which delivers 185 CFM at 100psi. It took approx 10 min. each, to sandblast 4@ 36"X36" 15 lb. HDU panels with white silica.
We made our own Grain Frame from 2X4's and scrap wire. Every kind of wire, from barbwire to elevtrical scap stuff. The purpose was not to save money, rather the desire to get a beautiful irregular grain pattern.
We have the commercial grain frame. Would make someone a good buy.
Joe