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December 16, 2018, 01:19:07 pm
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Slab Grabber

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Author Topic: Slab Grabber  (Read 730 times)
minkos61
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« on: October 26, 2014, 11:43:09 pm »

Needed a slab grabber so I went ahead and built one.





Very happy with how it worked out.
Thanks for looking.

Ernie
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Ernie

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« Reply #1 on: October 26, 2014, 11:53:45 pm »

Good job Ernie.
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Justin
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« Reply #2 on: October 26, 2014, 11:59:42 pm »

Very nice. Looks solid. I love my slab grabber. Makes slabbing so much easier. I don't stress about maximizing slabs on the first go around. Just cut what you can and go back to it later!
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39don
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« Reply #3 on: October 27, 2014, 07:53:16 am »


Super design Ernie and easy to make...........I like how the top bar pivots to grab the heel......

I have question.......What are the 2 larger, non threaded holes, on each side of the threaded holes for?

39don
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deb193
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« Reply #4 on: October 27, 2014, 09:15:34 am »

The top-bar pivot does seem to be the best design. I have a commercial (I think Lortone) large slab grabber that has the pivot, and The 2nd edition of Tony's smaller grabbers had a pivot.

The other design element I like in grabbers is more than one row of threaded holes or at least staggered holes. (Less necessary when the top bar pivots, but still sometimes useful.)

I have been thinking about a design feature where the top of the vertical bars have a flat plate added to allow top-bottom clamps to bear down, although I can often just turn the clamp sideways and elevate it in the vise.) I also tried moving the vertical bars into the face of the grabber, but that eats into the cross-thread movement.

Taking the time to make these gadgets is a real investment in slabbing technology. I enjoy seeing rockhounds building tools to solve problems. Kudos.
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minkos61
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« Reply #5 on: October 27, 2014, 06:15:37 pm »

Thanks everyone for the kind words.
39don the outer holes are also tapped! Just tapped them to a bigger size ! The inner holes are 1/4"N.C. and the outer bigger ones are tapped to 3/8"N.C.  and I only did them bigger for larger end cuts .

Ernie
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« Reply #6 on: October 27, 2014, 06:24:03 pm »

It is a lot easier to use JB Weld to glue a piece of wood to the stone.........
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« Reply #7 on: October 27, 2014, 07:42:17 pm »

Glue does require patience and planning, which I often lack since I cut on a whim.
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« Reply #8 on: October 27, 2014, 09:22:21 pm »

I use slab grabbers all the time. I like that I can put it in a grabber and then orient the grabber to get different angles on the stone. Invaluable with material like Labradorite, rainbow obsidian and  some Pietersite.

Nice design Ernie!



Tony
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jakesrocks
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« Reply #9 on: October 27, 2014, 09:49:42 pm »

Very nice job on the slab grabber. Very similar to a couple of vintage grabbers that I have.



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minkos61
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« Reply #10 on: October 27, 2014, 11:49:51 pm »

Thanks guys ! 
Don thats a cool little grabber.

Ernie
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Ernie
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« Reply #11 on: October 28, 2014, 06:38:45 am »

I like your grabber Ernie!!  Great job!  yes
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« Reply #12 on: October 28, 2014, 12:32:22 pm »

Well done on the construction project. Here is another beauty that was made a few years back but no more:



It's a mini grabber that works perfect for smaller end cuts. This clamp is about 4 inches by 4 inches and was made and sold on eBay. But the seller apparently disappeared or stopped making them. I considered trying to produce them or something similar but figured the cost for equipment (welding, threading and cutting) would be too high to justify selling 100-200 units. However if you already have the equipment, bringing this to market again would help the lapidary community. Here is a fast hole threader that is used on a drill press:



This is assuming of course that the original guy doesn't have a problem with it and there's no patent. The only downside as mentioned above is that the market is limited and very specific. Once everyone has one sales will be very slow.
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jakesrocks
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« Reply #13 on: October 28, 2014, 02:04:53 pm »

Ernie, my grabber was produced in the 50's and 69's, before casting costs went through the roof. A person couldn't afford to make them now. I have 2 different versions of it. Here's pics of both,

Back side.


Front


Side view


And finally, for grabbing small pieces the jaws can be removed, and screws put in their mounting holes.


There is also an extension which attaches to the back of the larger grabber, so it will grip in larger vice jaws.


There were other attachments for these vices, including an indexing head for cutting sphere preforms. I'm constantly watching the various auction sites, looking for the other attachments.
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A day spent without learning something new, is a day wasted.

Don

minkos61
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« Reply #14 on: October 28, 2014, 09:59:09 pm »

Thanks everyone I really enjoy building stuff and really love building stuff that has a use  yippie
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Ernie


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