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.
catmandewe: Took me 3 hours to get my fork lift started yesterday, it is coooooooold here
Nov 18, 2014 11:30:48 GMT -5
mr.mohs: sound like you were forked on the job
Nov 18, 2014 11:57:13 GMT -5
drocknut: Glad you got it started Tony.
Nov 18, 2014 14:53:38 GMT -5
drocknut: doing my happy dance right now because my fridge started working so for now I won't have to call the mobile rv repairman to fix it. Fingers crossed that it keeps working and my tanks thaw soon.
Nov 18, 2014 15:09:01 GMT -5
mr.mohs: strange story Diane I thought that said mobile t.v. repairman
Nov 18, 2014 16:26:33 GMT -5
Fossilman: Are ya' packing up while the thaw is going on?? South lookin' better all the time,I bet!! LOL
Nov 18, 2014 16:59:39 GMT -5
snowmom: It was a comet!
Nov 19, 2014 4:41:15 GMT -5
Nov 19, 2014 4:41:31 GMT -5
glennz01: Only 2 more red rocks to cut up
Nov 20, 2014 16:33:37 GMT -5
snowmom: glennz01 don't forget the pictures!
Nov 20, 2014 17:09:41 GMT -5
Shotgunner: woohoo!! Cuttin' quartz! The saw is a slicing!
Nov 20, 2014 22:32:33 GMT -5
snowmom: Shotgunner don't forget the pictures! ( I sense a theme developing here)
Nov 21, 2014 6:24:15 GMT -5