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.
Shotgunner: Nothing better than the sound of the slab going 'clunk' at at the same moment the saw shuts off.
Sept 11, 2014 21:21:31 GMT -5
Geoff: Thanks for trying to keep the heat off me everyone
Sept 11, 2014 22:13:10 GMT -5
wampidy: Well dude, you are not forgettable and would hate to see a great father torn away from his beautiful babies so he could do hard time or community service. Plus you post some cool s..t. How are the babies by the way? When I see your name on here it reminds
Sept 12, 2014 8:26:06 GMT -5
wampidy: me of the photo of you and your daughter at the flat lap polishing rocks. Best photo of the decade.
Sept 12, 2014 8:27:02 GMT -5
Geoff: Those kids are obscene with their cuteness. Makes me want to throw up. :p
Sept 13, 2014 16:31:15 GMT -5
broseph82: Met a lady at my kids baseball game who is a former rockhound from Washington state. She said she had a bucket full of Adventurine that she would let me pick my fill from.
Sept 14, 2014 16:20:22 GMT -5
mr.mohs: some guys have all the luck
Sept 14, 2014 18:06:52 GMT -5
broseph82: and its all stock thats about 20yrs old
Sept 15, 2014 9:08:43 GMT -5
linus: I am trying to contact bobby1. Proboards says he often connects. I sent a message through "Send Message" but never got an answer probably because he never reads those messages.
Sept 15, 2014 15:50:27 GMT -5
linus: Is there another way to contact him ?
Sept 15, 2014 15:50:46 GMT -5
therockviking779: So probably a lame question but oh well, trying to post pic's with a thread and wont let me says all my pics are to many MB's what do i do?
Sept 15, 2014 16:14:49 GMT -5
linus: bobby1, you are online. Please read my personal message ! I tried the chat but it is not working.
Sept 15, 2014 16:32:26 GMT -5
Fossilman: I use "photobucket" for my pics,they automatically set the MB's on my photos..
Sept 16, 2014 14:54:14 GMT -5
150FromFundy: Photobucket is the way to go. It is a pain, but after posting pictures since 2009, I'm only 30% full.
Sept 16, 2014 17:27:38 GMT -5
Shotgunner: Flickr give a terabyte and has a much better user experience. They automatically allow you many different sizes.
Sept 16, 2014 20:05:58 GMT -5
Shotgunner: linus does Bob know who you are? If you had pm'd me I may have ignored too. Perhaps some posts and a self intro are in order?
Sept 16, 2014 20:07:04 GMT -5