HS sanders are nice for sanding large pieces. I have used them for slabs, but when I do I sand 6 or so at a time, rotating through them before they get hot to avoid cracking. I ALWAYS hook it up to a vacuum to suck most of the dust up, and ALWAYS wear safety glasses and a dust mask. Also it's important to know what you're sanding, some rock dust is poisonous and the dry sanding doesn't work for everything. If you choose to build one they use a 3450 RPM motor, not the standard 1725RPM type.
bobby1 would be the one to talk to about dry sanding. I believe he dry sands most of his giant cabs using SiC belts. Following his advice when I was having trouble with scratches on just one portion of my cabs (every time), I started dry sanding mine with a well worn SiC belt and my scratch issue disappeared. You do have to be careful with heat and some stones just do not take to heat well but on those that do ok, it brings up a super shine. I found that it did not work on a couple of softer stones, they ended up kinda orange peeled from the heat.
Chasfire has one of Richardson's High Speed sanders, and you have all seen the killer polish he gets. Big material acts as its own heatsink, whilst thin slabs do not, so you have to be careful in not overheating them. Woody
Post by rockhound97058 on Mar 15, 2010 21:48:10 GMT -5
These sanders go work great. I've used one for 14 years and love it. It can be a little intimidating at times due to the sanding head right next to your fingers and in my case chest level. Also it takes time to get the feel of it. I used to use this for rough to fine grits, but now I strictly do my course sanding and finish up with a expando drum! I do small 1/4 stones up wards of huge pieces with this sander. I also do slabs by hand.
One thing though if you shred paper it can tear meat from your hand LOL.... Course grit paper just floats, however the fine grits are best glued onto the head. I personally never glue any of mine due to the mess and found the glue would create bumps under the paper.
The unit you linked to is a little rough looking, however still in usable material. I see the auction has ended - Great price for whoever bought it... These things run about $400 new right now
These sanders can build up heat, but the trick is keep moving and try not to bevel the edges with it. This machine works fantastic with agates, jaspers and more... However some thing it's terrible... Mexican Coconuts are a pain in the rear... best with wet drum.
Speaking of Richardsons... Bonnie called me yesterday and told me to pass the word they opened some of the beds for digging. Red Bed, Moss Bed and Pony Butte are open. Blue bed like every year is full of water and won't be open for another month or so.
Another quality posting by the Redheaded Rockhound! =) ~ Gotta lick those rocks to see if they shine!!
I have used this sander on agate and jaspers quite a bit. One thing to keep in mind is the temperature difference between cold rocks and the heat from the sander. The only time I have had a problem with heat is when the agate or jasper is real cold before sanding. I now warm the rock before I start sanding. I have even sanded a slab that was only 1/16" thick without cracking it.
jakesrocks: Burgers & tater salad. Big ol' watermellon in the fridge cooling down, and a big ol' box of fireworks for tonight.
Jul 4, 2015 12:27:37 GMT -5
jakesrocks: Not as bad today Mike. Wind's out of the south east, blowing it away from us.
Jul 4, 2015 12:28:49 GMT -5
mr.mohs: messed up ! didn't get the crock pot of pinto's started in time. always tomorrow
Jul 4, 2015 12:47:22 GMT -5
woodman: Only 94.1 now, Had watermelon on patio under the trees laying in a hammock. Life is good! Happy 4th!
Jul 4, 2015 16:05:35 GMT -5
Rockoonz: Happy Independence Day. Went up the 5 to my home town and had breakfast with a high school classmate I haven't seen in over 40 years. Just had grilled pork chops and fixins, watermelon in a bit.
Jul 4, 2015 20:01:30 GMT -5
drocknut: Well, we got cooler weather today along with some rain. Glad I don't have to work today.
Jul 5, 2015 11:17:34 GMT -5
mr.mohs: I'm OFF everyday whether I have to work or not...mostly
Jul 5, 2015 12:55:28 GMT -5
jakesrocks: Had a danged unexpected thunder storm last night, just as it was getting dark enough to haul out the heavy artillery. Had to wait until after 11:00 PM to rattle some windows. Got all of the fireworks fired off just before round 2 of the storms rolled in.
Jul 5, 2015 13:02:15 GMT -5
jakesrocks: Saved one large mortar round for midnight New Years Eve.
Jul 5, 2015 13:04:00 GMT -5
jakesrocks: A pop, a boom, about 6 more pops, a sizzling sound & lots of pretty colors.
Jul 6, 2015 14:20:16 GMT -5
mr.mohs: right on Don. Those boomers are illegal in AZ but that never stopped me...m stly
Jul 6, 2015 16:32:43 GMT -5
mr.mohs: too bad they weren't illegal in Maine
Jul 6, 2015 17:10:20 GMT -5
jakesrocks: They were illegal in California too, but I knew a Korean store owner with a back room.
Jul 6, 2015 18:46:04 GMT -5
mr.mohs: gotta love those back room booms...
Jul 6, 2015 19:32:55 GMT -5
jakesrocks: I don't know where he was getting them. Didn't care. But he was the last place that I could find that had M80's & Cherry Bombs.
Jul 6, 2015 20:53:24 GMT -5
mr.mohs: I was blowing off cherries & M80 at way to young an age. Lucky! Those are powerful. The water proof green wax fuses are deceptive. Easily gotten-- when going to Nogales--- was like going to huge swap meet.
Jul 6, 2015 21:12:46 GMT -5