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.
drocknut: Yes I do know what I'm missing Jean, heartburn. ...lol.
Feb 28, 2015 10:36:05 GMT -5
drocknut: Mmmm brownies, mmmmm fudge now I'm getting hungry.
Feb 28, 2015 10:38:13 GMT -5
snowmom: jean, they are plain with powdered sugar on top, son has "bodfl" and ordered them that way.
Feb 28, 2015 11:32:26 GMT -5
snowmom: Bodfl is 'brownies on demand for life' my life or my ability to keep making them. Very few people have bodfl
Feb 28, 2015 11:32:56 GMT -5
snowmom: my other specialty is fudge. nobody has fodfl..
Feb 28, 2015 11:35:10 GMT -5
drocknut: My grandfather made wonderful fudge. We kids got to help him mske it. Fun memories of him.
Feb 28, 2015 12:23:20 GMT -5
Pat: rockpickerforever 's jelly is the best! I make peanut brittle, and peppermint bark. Used to make caramels (yum), but can't handle the butter anymore.
Feb 28, 2015 15:15:23 GMT -5
jakesrocks: Dang rockpicker, what you talking about "too hot" ? Ain't no such critter. The hotter the better.
Feb 28, 2015 17:54:32 GMT -5
Shotgunner: Ok guys. That's three dogs in one week. Enough already!! Gtg have a good cry.
Feb 28, 2015 19:30:15 GMT -5
snowmom: Pat caramel is my favorite, no butter would be a major bummer. I'd forgotten but my grandma always made peanut brittle to give as gifts at Christmas time, we helped her do that and also made taffy (ever pull taffy?)
Mar 1, 2015 5:32:34 GMT -5
1dave: jakesrocks HOT? I was in LaPaz Bolivia and asked for a typical Bolivian meal at a restaurant. Never tasted another thing for a week!
Mar 1, 2015 8:25:51 GMT -5
rockpickerforever: Pat makes the BEST peppermint bark! I suspect anything she makes is delicious!
Mar 1, 2015 8:52:59 GMT -5
drocknut: Ok you are not helping me give up sugar....grrrrr
Mar 1, 2015 10:24:52 GMT -5
rockpickerforever: drocknut Why would you want to give up sugar? Isn't that what makes you sweet?
Mar 1, 2015 12:41:45 GMT -5
wampidy: Who wants to be sweet? Better to be a crabby old bastard (or bastette).
Mar 1, 2015 17:46:47 GMT -5
drocknut: lol rockpickerforever naw, it's my sparkling personality that makes me sweet, sugar just makes me fat...lol.
Mar 1, 2015 19:18:50 GMT -5
drocknut: wampidy, you are sweet, you just try to look like a crabby old bastard to hide it.
Mar 1, 2015 19:20:04 GMT -5
drocknut: Ok this cruddy rain and dreary weather can quit anytime. .what happened to sunny Arizona?
Mar 2, 2015 10:39:28 GMT -5
Fossilman: Diana,we got your sunny days,we gave you our rains-enjoy...LMAO...........
Mar 2, 2015 10:56:03 GMT -5
drocknut: No fair Fossilman..give back that sun.
Mar 2, 2015 10:58:18 GMT -5