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.
jenb: I get it....didnt mean the ?
Jul 24, 2015 19:57:48 GMT -5
mr.mohs: when in doubt-- shout it out! mostly™
Jul 24, 2015 20:11:47 GMT -5
drocknut: Rainy day here, we need the rain but it sure puts a damper on my mood and work.
Jul 27, 2015 10:55:12 GMT -5
jakesrocks: No rain here yet. Just very high dew point. 85 & feels like 95. Rain coming again tonight.
Jul 27, 2015 13:07:17 GMT -5
Fossilman: Cool today,showers lastnite-We get 7 or 8 days of triple digits coming again,starting tomorrow!!!....Huge frown!!!
Jul 27, 2015 15:00:52 GMT -5
jakesrocks: Better come back to the Dakotas Mike. Low to mid 80's for the next week. 50% chance of a sound & light show tonight.
Jul 27, 2015 21:03:12 GMT -5
jakesrocks: WooHoo, gully washer last night. Came in around 1:00 AM. 60 + MPH winds. Got all of the siding on the house washed. Don't need to haul out the pressure washer to do it.
Jul 28, 2015 11:03:40 GMT -5
drocknut: Sun came out and it's warming up but the wind is horrible.
Jul 28, 2015 12:26:38 GMT -5
woodman: 101.2 here west of Portland right now, 1:21 pm.
Jul 30, 2015 15:23:52 GMT -5
rockpickerforever: Mercy! That's not a temperature, that's a radio station! Try to stay cool, woodman.
Jul 30, 2015 15:36:03 GMT -5
woodman: now 102.1 71.3 in basement with AC running hope power don't go off!
Jul 30, 2015 15:40:23 GMT -5
woodman: I wonder what this will do to rockhounging in the aea..http://www.oregonlive.com/travel/index.ssf/2015/07/owyhee_preservation_proposal_i.html#incart_river
Jul 30, 2015 16:22:44 GMT -5