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.
Fossilman: Ed,Tequila is good medicine....LOL
Mar 30, 2015 16:54:07 GMT -5
mr.mohs: right on Mike! bypass the grapefruit juice --straight to the hard stuff. at this age whatever doesn't kill us makes us stronger...mostly
Mar 30, 2015 18:48:50 GMT -5
Fossilman: I'm not much on beer,hate the taste (bitter)....Will have one on a hot day though..LOL Tequila has always been my choice of liquor,when I drank...The bad thing about it,it makes you braver than you should be-LMAO..
Mar 31, 2015 11:10:14 GMT -5
drocknut: Does tequila really make your clothes fall off like the song says?
Mar 31, 2015 11:43:43 GMT -5
catmandewe: Oh yes, and sometimes it is not a pretty sight!
Mar 31, 2015 14:52:05 GMT -5
catmandewe: It also makes my motorcycle go faster
Mar 31, 2015 14:52:33 GMT -5
mr.mohs: all the above and Montezuma Revenge
Mar 31, 2015 16:59:45 GMT -5
bsky4463: Hey Mohs...saw your shout out in an earlier thread. On the coast for another month then back to MT. Not on the forum as much when I am out here. Thanks for the "heart"-felt howdy from the Superstitions. Cheers
Mar 31, 2015 17:57:05 GMT -5
Fossilman: Catching any fish,while you are out this way???
Mar 31, 2015 18:01:44 GMT -5