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Lapidary / Gemstone Community Forum
February 17, 2019, 12:52:02 pm
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Rock Clamps for Slabbing

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Author Topic: Rock Clamps for Slabbing  (Read 6713 times)
Steel and Stone
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« Reply #15 on: September 27, 2009, 09:31:22 pm »

On the movable clamp, if you put the nut on on the top of the jaw on the end nearest the stone and the nut on the underside of the jaw furthest away from the rock you can use the leverage of pivoting  on the front nut and really get a death grip on the rock. It is shown in my pictures of the clamp. This also eliminates having to perfectly adjust the distance on the clamp. It is a much simpler approach for the clamp.
Bob

Bob,

I know exactly what you mean about the nuts, I tried it both ways yesterday and just put all the nuts back on to store it (Just in case I ever need them all or a spare). You are right though about the death grip I just put a little "test" groove in a scrap piece and it sure seemed to hold like crazy.
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hulagrub
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« Reply #16 on: October 12, 2009, 06:07:01 pm »

Guys, you have some great ideas. Put my duff to work yesterday, and made one. Already had some steel, went Tractor supply and spent about 3 bucks on allthread and nuts. Still needs some fine tuning, better grooves and closer to the ends. Kind of hard to do pricise work with a four and a half inch angle grinder. Also added wing nuts and offset one end a quarter inch, in case of whatever.


* geodes,clamp,sift 003.JPG (200.97 KB, 752x575 - viewed 68 times.)
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Dave, a certified Rockaholic

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« Reply #17 on: October 12, 2009, 06:56:23 pm »

Dave, great job on the clamp.  Wish i had the time, tools, and drive to make one myself.

Mark
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CMan
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« Reply #18 on: October 12, 2009, 07:02:33 pm »

Here is some slab grabbers.
http://www.arrowheadlapidarysupply.com/news/details.php?unid=38
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« Reply #19 on: October 12, 2009, 10:11:48 pm »

I too wish had some stock steel and the tools.

Great job on yours Dave.. Looks like it is pretty close. Even as it is your going to salvage a lot of extra slabs !
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Chuck
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« Reply #20 on: November 16, 2009, 07:13:11 pm »

www.sphereproducts.com   markets a product that is called a "Slab Grabber".  It looks very similar to the product with the four screws that can hold many challenging shaped rocks.   The price is $34.  I ordered one last week but have yet to get it.  I did have a similar product years ago and recall that it was a tremndous asset to my slabbing efforts.  It really opened up a new avenue of cheap stones, since I could buy heels and thinner materials that not many people would buy.  I have often gotten some exciting slabs out of it.   I have found that commercial cutters often have some really nice heels for sale if you ask. I did acquire an exquisite, although on the smaller side, piece of Montana agate for $2.  It cut two $40-50 stones.  Not bad for a hobbyist.
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« Reply #21 on: November 16, 2009, 07:52:43 pm »

Thanks for the link Chuck ...  :)
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« Reply #22 on: April 24, 2010, 09:39:50 pm »

Here you go Gary!
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« Reply #23 on: April 25, 2010, 12:44:41 pm »

Thanks for the link. I have been looking around the net at different clamps since the Tucson gem show. This one looks great. Thanks! I also saw at the Tucson electric park show a guy that makes interesting rock clamps. I was soooo tempted to buy one. They are not cheap. They were real heavy duty and looked well made. Check them out on U-Tube. I am not sure how to put a link up on this forum. If anyone knows how, and if we can, please link it up. The clamp is called  CRS GRIPPERS. Eric.
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Eric

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« Reply #24 on: April 28, 2010, 11:10:03 am »

Ran into this on Ebay today..
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« Reply #25 on: April 28, 2010, 04:25:36 pm »

My father purchased one of the gripper clamps the first year they were in Tuscon.  They work but he was not very impressed.  You can cut a few more odd shaped rocks with one but they still do not do a good job of cutting up heels and end cuts.  I have been using a clamp similar to the one you made Dave.  Make sure you notch the rock first!  I lost a couple of blades on ends that did not hold in the clamp well.  I am currently just glueing rocks to scrap 2x4s and it seems to work well.
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« Reply #26 on: April 28, 2010, 09:10:59 pm »

I know what you are saying. The gripper has some limitations. I found out that in the lapidary world, there is not a magic clamp that does it all. I am still working with wood and glue. I found it works great! The slab grabber looks good for me too. It is also less $$$. Eric
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Eric

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« Reply #27 on: April 30, 2010, 08:44:56 pm »

great information all. Gearge help where was the clamp for $40?? I would have to pay a machinest more than that.
Alvin
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« Reply #28 on: April 30, 2010, 09:26:09 pm »

There are a few on this eBay page Alvin.

 walker
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« Reply #29 on: May 02, 2010, 06:59:14 pm »

well guys I can not make those tools dancer5 found them all on ebay under slab grabbers. thanks for letting me know these existed. never seen them before.
Alvin
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