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.
mr.mohs: RRR --all we ask is that you believe in a higher rock...mostly™
May 18, 2015 21:40:19 GMT -5
wampidy: Better stay away from those higher rocks mr.mohs cause they kin fall an kilt ya.
May 19, 2015 23:21:04 GMT -5
mr.mohs: only way to go-- Rock In Peace (or Pieces) ...mostly™
May 20, 2015 10:04:40 GMT -5
mr.mohs: Rock Roll Rehab
May 20, 2015 10:05:14 GMT -5
Fossilman: No rehab for me!!!!!! I love this addiction.......LOL
May 20, 2015 13:48:46 GMT -5
drocknut: No rehab or twelve steps forme either. Hello, I'm drocknut and I'm a proud rock addict
May 20, 2015 15:23:19 GMT -5
rockpickerforever: Embrace your addictions. They are what makes you special! I wonder, is rock hoarding a genetic or learned behavior?
May 20, 2015 16:18:49 GMT -5
mr.mohs: Rock Roll Revival !
May 20, 2015 16:40:34 GMT -5
150FromFundy: One more question ... If you are a confessed rock hound, are you a hunter, or a gatherer? Maybe we need an anthropologist on board to answer the tough questions.
May 20, 2015 17:31:57 GMT -5
drocknut: Both Jean. Also both hunter and gatherer.
May 20, 2015 21:54:34 GMT -5
wampidy: Rock thief is more like it. hahahaha
May 20, 2015 22:31:50 GMT -5
drocknut: Haha Jim, never gonna give that up are you?
May 20, 2015 22:34:39 GMT -5
rockpickerforever: Thanks for the smile, guys! Ah, memories...
May 20, 2015 23:10:19 GMT -5
jakesrocks: Neither hoarding nor genetic Jean. Rocks are fossilized rabbits, and just seem to multiply just like live rabbits. (Ever wonder what all of those little chips in the bottom of a box of rocks were)?
May 21, 2015 9:53:50 GMT -5