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Post by captbob on Oct 10, 2016 13:09:50 GMT -5
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Post by Deleted on Oct 10, 2016 13:38:10 GMT -5
Why segmented blades Scott? Those that I have seen were continuous blades. I read, maybe here (?), that segmented blades aid in faster waste removal, bit don't understand any benefit other than that. For the very reason you state. Better waste removal keeps the diamonds on the work piece doing their job. We have both at class. Continuous rim cuts half as fast. jamesp I use advanta tools on ebay Skinny cutting surface cuts deeper faster, make the cutting surface too wide and your psi on the cutting area diminishes dramatically.
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jamesp
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Post by jamesp on Oct 10, 2016 14:25:11 GMT -5
Why segmented blades Scott? Those that I have seen were continuous blades. I read, maybe here (?), that segmented blades aid in faster waste removal, bit don't understand any benefit other than that. For the very reason you state. Better waste removal keeps the diamonds on the work piece doing their job. We have both at class. Continuous rim cuts half as fast. jamesp I use advanta tools on ebay Skinny cutting surface cuts deeper faster, make the cutting surface too wide and your psi on the cutting area diminishes dramatically. What spacing, like a washer ? Like this ? : www.ebay.com/itm/8-Diamond-Saw-Blade-for-Brick-Block-Concrete-Masonry-Pavers-Stone-/120742212952?hash=item1c1ccbf558:g:y70AAOSw9mFWLVhJ
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jamesp
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Post by jamesp on Oct 10, 2016 14:34:41 GMT -5
McGill has a similar 9 inch for cheaper. McGill has low prices.
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Post by Deleted on Oct 10, 2016 14:43:51 GMT -5
McGill has a similar 9 inch for cheaper. McGill has low prices. I would look for granite blade. Advanta is adding for ebay commission. I buy direct and pickup. Way better prices this way. Volume discounts too. I would use stainless washers as spacers. No corrosion on a part that cannot be cleaned and dried.
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jamesp
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Post by jamesp on Oct 10, 2016 14:53:27 GMT -5
That Sumatra Flame agate made coral feel like butter. Still in shock at how hard that rock is.
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jamesp
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Post by jamesp on Oct 10, 2016 14:56:18 GMT -5
Always considered any type blade/grinding wheel rated for granite to be best for lapidary. The concept of using spaced blades is a good one. I get it. Stainless ? Oh yes.
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Post by captbob on Oct 10, 2016 14:59:28 GMT -5
I've seen a couple builds where CDs were used as spacers. Guess the center needed to be drilled out some?
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jamesp
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Post by jamesp on Oct 11, 2016 5:10:18 GMT -5
I've seen a couple builds where CDs were used as spacers. Guess the center needed to be drilled out some? Builds on Youtube ? Would like to study them. As cheap and easy as the king kong build thinking about an assortment of grinders for various needs. Gang saw for fast removal. Cup for flatfish areas. Vertical head for concave profiles. One thing for sure, in a months time I will have a whole cabinet full of shiny specimens. The vibe is the bottleneck, 3 of the 5 barrels are making it work full time. Normally it sits 90% of the time. I am going to divide the Viking hopper in half with a thick (3/4") rubber insert so I can run a big stone in each side. Wish I had a Thumbler barrel with the full open end. It would be good for doing a 5 pounder with nothing but pea gravel for media(my preference). The opening in the Viking would limit to a 5 pound egg shape. And concerns of a jam in the Viking may be justified. Regardless, grind time is still the least issue as far as time. Grit adds and clean outs are the work makers. I put AO 80 in the vibe, do a clean out and then do AO 500 or AO 14,000 polish. Remove finished rock. Add AO 80 without doing a cleaning out and do it all over again. Mixing AO 80 with the clean polish run means nothing. If doing AO 500 and AO 14,000 on a rock then yes, a clean out before the 14,000. Found out yesterday that Borax + AO 80 is 2-3 times faster than sugar. But must watch for dry out which will mess up your stuff. That will help with the vibe bottleneck. Developing a crap load of crap tumbles. Rejects mostly rejected for shape issues. I had broken and set aside. Screened to 1 inch +/-. About half are sexy materials. They get shuffled around at mass 5 barrel clean outs. Big rocks are chewing them up fast. Requiring lots of additions of this size during tumble. They have various times in the rotary. Many finished in coarse grind and set aside for finish. Strange concept, a bunch of small easy to clean out barrels spitting out a lot of production and one big bonus rock per barrel. As opposed to one big barrel.
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jamesp
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Post by jamesp on Oct 11, 2016 7:38:47 GMT -5
Got a ripped shine on this coral @ 13 ounces. Only fractures are the two little ones to the left of the reflections. Tiny pits in glare are typical of coral, runs throughout. Smaller media(1" or smaller) better for big rocks unless you can thicken slurry carefully. Small marks in coral, not bruises. 3rd big rock finished, getting it dialed in.
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jamesp
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Post by jamesp on Oct 11, 2016 8:06:17 GMT -5
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Post by captbob on Oct 11, 2016 8:07:38 GMT -5
I've not seen anything on youtube, there are actually a couple threads here on the forum about these gangsaws. I tried searching for them yesterday and couldn't find them. must not be using the right search words, or another thread morphed into gangsaw discussion. there is this - www.hgms.org/Articles/SuperGrinder.htmlthis thread from here isn't the one I was looking for - forum.rocktumblinghobby.com/thread/23041
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jamesp
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Post by jamesp on Oct 11, 2016 8:34:11 GMT -5
Thanks captbob. May stick to my easy on easy off interchangeable system. Grinding head mounted on shaft end for easy interchange of different grinding heads.
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Fossilman
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Post by Fossilman on Oct 11, 2016 9:40:25 GMT -5
Beautiful knife work orrum!!! Skills are awesome!! James the tumbled bigger material is coming along great,skills to match too..... Two thumbs up for both of ya'!!!
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jamesp
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Post by jamesp on Oct 11, 2016 9:42:51 GMT -5
Beautiful knife work orrum!!! Skills are awesome!! James the tumbled bigger material is coming along great,skills to match too..... Two thumbs up for both of ya'!!! Diggin the new knife. Keep it next to the computer. Too close to the Ms' though. May have to back off the aggravating rhetoric.
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Post by Deleted on Oct 11, 2016 10:23:20 GMT -5
It's not really a gang saw. That is a machine that cuts many slabs at once.
It's a super grinder. As you found.
I had forgotten about the CD trick. Thanks!
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jamesp
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Post by jamesp on Oct 11, 2016 11:23:08 GMT -5
It's not really a gang saw. That is a machine that cuts many slabs at once. It's a super grinder. As you found. I had forgotten about the CD trick. Thanks! Never thought about using saw blades on the 5/8-11 threads on my machine. If the hole in the blade is bigger a bushing will make it work. As I mentioned to Bob I do like the open end shaft on my machine for changing cutters. A thought.
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Post by captbob on Oct 11, 2016 11:34:37 GMT -5
Any reason that you couldn't stack multiple blades on that shaft? I believe these super grinders are usually used with water though. Scott, the two you use have a water drip system?
Scott's post that the segmented blades remove material so much faster changed my plans for using continuous blades.
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jamesp
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Post by jamesp on Oct 11, 2016 11:53:53 GMT -5
Segmented a good thing to remove cuttings. Yes, mine can do a blade stack. Just thought about it since we've been discussing. I keep 2 open end wrenches at arms reach and change out cutting heads in a minutes's time. Threads on vertical shaft 2.5 inches long so you can put a good may blades between 2 nuts. Most of the wheels I use are threaded requiring one stop nut. But there is a plethra of 5/8-11 threaded cutters out there and more being designed. I could have built the machine horizontal or vertical. Horizontal probably better for water feed. Lapper design (horizontal) could have a catch bowl though.
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Post by Deleted on Oct 11, 2016 13:02:11 GMT -5
Yes water feed
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