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: its a nice long road trip out of AZ...mostly... easy does it...
Oct 7, 2015 9:30:50 GMT -5
Rockhobbit: Where you headed Diane??
Oct 7, 2015 12:04:01 GMT -5
mr.mohs: not sure...last time I tried to guess her destination... I was horribly wrong ...mostly
Oct 7, 2015 20:01:34 GMT -5
drocknut: Won't keep you in suspense this time Ed ;-) Going to Montana for a quick trip.
Oct 8, 2015 7:54:07 GMT -5
mr.mohs: wow lots of on the road there, Diane --take it easy !
Oct 8, 2015 8:39:36 GMT -5
Rockhobbit: While most count down the days till Christmas, I count down the days till Quartzsite! LOL
Oct 8, 2015 11:55:23 GMT -5
jakesrocks: Ya Ya Ya. Diane can drive all the way to Montana, but can't come next door to South Dakota to say hi.
Oct 8, 2015 12:25:27 GMT -5
shotgunner: Diane go say hi to Don. I bet hE'd like a hug from a young woman.
Oct 8, 2015 15:35:31 GMT -5
jakesrocks: Dang, if a young woman hugged me, I'd probably keel over dead.
Oct 8, 2015 15:54:35 GMT -5
mr.mohs: on the 12th day of Q my true rock pal gave to me...now you started something Sheri
Oct 8, 2015 16:39:32 GMT -5
drocknut: Sorry Don, I'm renting a uhaul trailer and only have 5 days to get it back and turned in in Arizona. Wouldn't want you to keel over ya know ;-)
Oct 8, 2015 20:32:43 GMT -5
mr.mohs: don't overload that trailer with too much rock weight... rolling into Q ?
Oct 8, 2015 20:51:17 GMT -5
jakesrocks: Heck girl, I was gonna load ya up with 3 or 4 buckets of rock, and all the fresh hot coffee ya can handle. And Jake was gonna wash the road dust off your neck & ears.
Oct 8, 2015 20:59:20 GMT -5
shotgunner: Dang Diane, if Don were to really step up and offer a nice home cooked meal, you would HAVE to go!
Oct 8, 2015 22:31:00 GMT -5
jakesrocks: Maybe my chicken n rice dish. Everybody who's tried it likes it.
Oct 8, 2015 22:42:21 GMT -5
jakesrocks: Night all. Gonna hit it early tonight.
Oct 8, 2015 22:43:45 GMT -5
drocknut: Well geez Don, you sure make it hard for a girl to pass you up. Can I get a raincheck on the rocks, coffee, dinner, and Jake wash?
Oct 9, 2015 8:54:14 GMT -5
drocknut: Ed, not going to Q just yet. Going to my mom's with this trailer. I'll have to be careful about the weight in the trailer for sure.
Oct 9, 2015 8:55:03 GMT -5
jakesrocks: Rock on Diane. Rockers are always welcome here. No raincheck needed, but a quick heads up a couple days in advance is always appreciated.
Oct 9, 2015 9:34:38 GMT -5
mr.mohs: are you posting from the road Diane? let us know your locations..
Oct 9, 2015 10:54:19 GMT -5