meviva
Cave Dweller 
Member since July 2013
Posts: 1,474 
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Post by meviva on Sept 7, 2017 18:18:47 GMT -5
I have a Barranca Diamond HP-14 slab saw. Lately the rock stops moving through the blade around one inch into the cut. The blade still spins. I end up having to turn off the saw and pull the vise back and start it again. Sometimes it will then finish the cut but sometimes I have to stop it again. I tried to tighten the clutch but that didn't work. It seemed like the rock was being shoved into the blade too fast before the blade was done cutting. The blade got pushed to the side a little and it was stuck in the rock. Any ideas what might help?
Thanks,
Andrea
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Post by orrum on Sept 7, 2017 19:25:06 GMT -5
Might need to sharpen it by sawing a piece or two of grindstone.
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Post by orrum on Sept 7, 2017 19:27:33 GMT -5
Other things too like carriage out of line or out feed messed up are a possibly but I would check the grindstone thing out first. It freshens up the diamonds and also gets the metal that smears across the diamonds off.
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meviva
Cave Dweller
Member since July 2013
Posts: 1,474
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Post by meviva on Sept 7, 2017 19:35:13 GMT -5
orrum would cutting through a brick do the same thing?
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Post by johnjsgems on Sept 7, 2017 19:40:05 GMT -5
Fire brick would or a fake concrete brick. The old clay bricks color oil bright red. Check the blade edge. It should be flat not rounded. If rounded tap along edge with a hammer. If glazed over or dull dressing open by cutting through the dressing stick, brick, etc. will correct. Harbor Freight sells dressing stones (may be edge grinders for tile) cheaper than dressing sticks from lapidary suppliers.
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Post by johnjsgems on Sept 7, 2017 19:41:51 GMT -5
Fire brick would or a fake concrete brick. The old clay bricks color oil bright red. Check the blade edge. It should be flat not rounded. If rounded tap along edge with a hammer. If glazed over or dull dressing open by cutting through the dressing stick, brick, etc. will correct. Harbor Freight sells dressing stones (may be edge grinders for tile) cheaper than dressing sticks from lapidary suppliers.
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meviva
Cave Dweller
Member since July 2013
Posts: 1,474
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Post by meviva on Sept 7, 2017 20:36:38 GMT -5
johnjsgems this is what the blade looks like now. In one pic you can see how far it got into the rock before the vise stopped pushing it through. The cuts are smooth when it finally makes it through. I just have to stop and restart it one or more times per cut. I think it might have something to do with the carriage. Also, the sound changes when it happens. It sounds like it might be backing off and then trying again....kind of like a skipping record. I took a video but I don't think I can post it....I tried with rockshow. Andrea   
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meviva
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Member since July 2013
Posts: 1,474
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Post by meviva on Sept 7, 2017 20:36:49 GMT -5
johnjsgems this is what the blade looks like now. In one pic you can see how far it got into the rock before the vise stopped pushing it through. The cuts are smooth when it finally makes it through. I just have to stop and restart it one or more times per cut. I think it might have something to do with the carriage. Also, the sound changes when it happens. It sounds like it might be backing off and then trying again....kind of like a skipping record. I took a video but I don't think I can post it....I tried with rockshow. Andrea
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Post by Peruano on Sept 7, 2017 20:58:15 GMT -5
Your photo makes it look like the rock is climbing on the blade (i.e. not tightly held in vice) and especially if the vice is traveling faster than the cut (dull blade?, or exceptionally bigger or harder rock than usual). I'd try the entire set up with a softer and smaller rock. If it works, then you can start focusing on blade and not on the vice movement mechanism. I rarely have to dress a blade, but I do cut a variety of material, not just one hardness. Your blade looks reasonable so consider all the other factors too.
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Deleted
Deleted Member
Member since January 1970
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Post by Deleted on Sept 7, 2017 21:27:08 GMT -5
Possible the free clamp is stripped?
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meviva
Cave Dweller
Member since July 2013
Posts: 1,474
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Post by meviva on Sept 7, 2017 21:49:52 GMT -5
Your photo makes it look like the rock is climbing on the blade (i.e. not tightly held in vice) and especially if the vice is traveling faster than the cut (dull blade?, or exceptionally bigger or harder rock than usual). I'd try the entire set up with a softer and smaller rock. If it works, then you can start focusing on blade and not on the vice movement mechanism. I rarely have to dress a blade, but I do cut a variety of material, not just one hardness. Your blade looks reasonable so consider all the other factors too. I think it's the shape of the rock that makes it look like that. I just tried to move it and it's solid. I will try with a softer rock and see what happens. Thanks Andrea |
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Post by Rockoonz on Sept 7, 2017 22:58:14 GMT -5
The sound you're hearing is the carriage half nuts slipping on threads of the feed, gets quieter every time it skips. It is normal, the built in safety to keep the feed from bending the blade. Your blade is probably dull and looks rounded to me as well. First cut a piece of grindstone to expose diamonds, then flatten the edge.
Take the blade out of the saw, lay it flat on a workbench with just a little hangs off the edge, mark a spot with a sharpie, then tap the edge with a hammer while rotating, the spot tells you when you're done. Tap very straight into the edge of the blade and look for the rounded edge to be flat again, no more than that.
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sphereguy
having dreams about rocks
Hello all I've been lurking for months now
Member since March 2017
Posts: 73 
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Post by sphereguy on Sept 7, 2017 23:21:14 GMT -5
I had a 14 inch loretone do the same thing and found that the key was missing on a pulley.
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,640
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Post by QuailRiver on Sept 8, 2017 1:55:48 GMT -5
I'm going to make my first attempt at using Google Photos hosting service here to post an illustration of the before and after cross sections of a saw blade with a worn down side kerf and rounded edge v.s. what it should look like after being hammered.  Larry C. |
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Post by orrum on Sept 8, 2017 7:41:39 GMT -5
Keep trying Larry please? I want to see this.
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Fossilman
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Member since January 2009
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Post by Fossilman on Sept 8, 2017 9:09:14 GMT -5
Run some Obsidian through your saw too,it helps a bunch too..........Sounds like your feed it goofing up on you.....
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meviva
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Member since July 2013
Posts: 1,474
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Post by meviva on Sept 8, 2017 11:19:38 GMT -5
The sound you're hearing is the carriage half nuts slipping on threads of the feed, gets quieter every time it skips. It is normal, the built in safety to keep the feed from bending the blade. Your blade is probably dull and looks rounded to me as well. First cut a piece of grindstone to expose diamonds, then flatten the edge. Take the blade out of the saw, lay it flat on a workbench with just a little hangs off the edge, mark a spot with a sharpie, then tap the edge with a hammer while rotating, the spot tells you when you're done. Tap very straight into the edge of the blade and look for the rounded edge to be flat again, no more than that. Yes, it does get quieter every time it skips. Is a dressing stone the same thing as a grindstone? I do have some obsidian I can cut as Fossilman suggested. The blade doesn't look rounded to me, I'll see how it does after sharpening. I hope that's all it needs. Thanks, Andrea |
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meviva
Cave Dweller
Member since July 2013
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Post by meviva on Sept 8, 2017 14:15:36 GMT -5
Will this work? I got it at Harbor Freight. It's for sharpening knives. Andrea  |
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Post by orrum on Sept 8, 2017 14:40:40 GMT -5
Yes that will do it.
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meviva
Cave Dweller
Member since July 2013
Posts: 1,474
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Post by meviva on Sept 8, 2017 14:51:16 GMT -5
Thanks orrum I'm going to try it now. |
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