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: Let's hope tomorrow is a really "Good Friday!!" But, ya know, I never met a Friday that wasn't good, lol! Lent is almost over, and soon back to the grind. Next week, no more fish on Friday, yay! You grind some rock'n hearts, mr.mohs, they'll luv 'em!
Apr 17, 2014 21:07:45 GMT -5
mr.mohs: the moon & blood stone is in the grind mode...
Apr 18, 2014 11:52:48 GMT -5
mr.mohs: grindus interruptus!...jus got called into work...no rest for old rock grinders...
Apr 18, 2014 14:15:11 GMT -5
rockpickerforever: Dang, I hate it when that happens!! (Why'd ya answer the phone? LOL)
Apr 18, 2014 15:15:51 GMT -5
mr.mohs: usually I don't Jean --I'm impossible to get hold of...its a reduced schedule- jus a bunch old men-- trying hard--got lots done on the heart -- have more grind time--so I might well make a dime... mostly
Apr 18, 2014 15:45:24 GMT -5
rockpickerforever: Except for this time! Isn't that how it always goes? Yeah, I hear you, Ed, chasing the dime. But gee, I hope you made more than one... Or maybe just peanuts - mohstly... (it needed an "h"!) Ya got, what, one more week for your Heart hearts?
Apr 18, 2014 18:02:45 GMT -5
mr.mohs: always Jean I have Murphy law posted in my work area-- but I'm in good shape on the hearts...mostly
Apr 18, 2014 19:17:08 GMT -5
mr.mohs: its a good day when I make more than one
Apr 18, 2014 19:19:28 GMT -5
drocknut: Guess what?? Naw you'll never guess. I now am the owner of a new travel trailer and I'm off on my journey to maybe being a full-timer living in the trailer. I've never towed a trailer before so please warn all the pedestrians in Montana I'm on the road.
Apr 18, 2014 20:18:42 GMT -5
drocknut: I just happened to have to wait out a big wind at a KOA so got internet at least for tonight. Miss chatting with you all.
Apr 18, 2014 20:19:50 GMT -5
mr.mohs: sounds great Diane!! trailers for sale or rent....
Apr 18, 2014 20:24:54 GMT -5
mr.mohs: o you may not know that -- I just broke into roger miller tune --cause I'm king of the road
Apr 18, 2014 20:27:57 GMT -5