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.
rockpickerforever: Or maybe some other kind of therapy...
Mar 4, 2014 11:28:51 GMT -5
mr.mohs: best I can say is deep breaths. they've gotten me this far hope it gets rolling smooth again soon!! edmohs
Mar 4, 2014 12:41:39 GMT -5
rockpickerforever: Thanks for the suggestion and well wishes, Ed. With the family all coming together, we'll make it through. Aging parents is something everyone has to face at some point. I know a lot of the RTH members already have or are dealing with it now.
Mar 4, 2014 15:11:11 GMT -5
drocknut: Jean hope you get in some rock therapy, the other kind is a bit expensive from what I've been told. Hang in there.
Mar 4, 2014 19:19:17 GMT -5
tumbleon: hi guys, best of wishes and prayers to everyone... just saying hello and goodnight
Mar 4, 2014 20:39:40 GMT -5
rockpickerforever: Thanks, Diane and tumbleon. Was just kidding about the other therapy, Diane, I'm doing okay. Trips to the hospital to see mom filling my days, not much time to play on the flat lap. But it's set up, so if I can get a minute...
Mar 4, 2014 21:05:02 GMT -5
mr.mohs: concerning therapy...I went to a shrink to get my head examined...no help...the doc ran into a rock
Mar 5, 2014 0:41:52 GMT -5
rockpickerforever: mr.mohs, I think we all have rocks in our heads, lol. Thanks, Paul, and mine with yours.
Mar 5, 2014 10:02:53 GMT -5
wireholic: Does anyone know if there are gems/stones or even just colors associated with the 12 step programs? My jewelry is being displayed in a shop that specializes in "recovery gifts" and I'd like to tailor the jewelry to the theme.
Mar 5, 2014 11:41:40 GMT -5
mr.mohs: recovery stones are probably a subjective thing- but the 'Book of Stones' would be a good resource...
Mar 5, 2014 12:39:23 GMT -5
wireholic: Good idea! Not sure if I have that book but I think I have a book on healing crystals somewhere
Mar 5, 2014 13:28:57 GMT -5
The Dad_Ohs: If you don't find your book, you can look up most any stone online and get a metaphysical answer about the stone, what chakras it opens if it works better with other stones or alone, what parts of the body/mind it affects, all that long hair stuff !!! LOL
Mar 5, 2014 19:50:14 GMT -5