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Post by mountainshadowrocks on Jan 13, 2018 15:26:10 GMT -5
I've been doing a lot of reading about slabbing correctly and working with the bigger diamond blades.
I was reading an older lap club's newsletter online, and it mentioned that when your slab drops off you are supposed to turn off the saw and not let the rest of the rock's nub feed through. It said that if you let those nubs finish cutting it will ruin the blade?
I am also wondering how people remove said nubby things when they find them on their finished slabs? I've been knapping mine off on an old vice on my bench, but this isn't always the best option because it does occasionally result in a broken slab... I don't have a grinder, so that's not currently an option. Would a small tile nipper thing work?
My new blade arrived a minute ago, so now I can look at a new blade with some magnification and know what my other blade should look like. It came installed on the saw, so I never really looked at it and have been wishing I had... Off to take my first whacks at labradorite rough...
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Post by rockjunquie on Jan 13, 2018 15:43:52 GMT -5
I don't have a big saw, so I can't help with that, but I buy slabs with nubs. I usually use a heavy pair of wire cutters I have to pop it off. It works about 75% of the time. I reckon tile nippers would work, too.
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Post by woodman on Jan 13, 2018 15:44:21 GMT -5
I've been doing a lot of reading about slabbing correctly and working with the bigger diamond blades. I was reading an older lap club's newsletter online, and it mentioned that when your slab drops off you are supposed to turn off the saw and not let the rest of the rock's nub feed through. It said that if you let those nubs finish cutting it will ruin the blade? I am also wondering how people remove said nubby things when they find them on their finished slabs? I've been knapping mine off on an old vice on my bench, but this isn't always the best option because it does occasionally result in a broken slab... I don't have a grinder, so that's not currently an option. Would a small tile nipper thing work? My new blade arrived a minute ago, so now I can look at a new blade with some magnification and know what my other blade should look like. It came installed on the saw, so I never really looked at it and have been wishing I had... Off to take my first whacks at labradorite rough... Harbour freight sell 4 in angle grinders and diamond blades for them. That is what i use to trim the slabs. |
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Post by rmf on Jan 13, 2018 16:14:14 GMT -5
I have a 24" saw and have never had an issue with this. Nubs stay on the slab until they are in my way for something like trim work. Unless they are real big and can cut you.
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Post by parfive on Jan 13, 2018 16:35:51 GMT -5
I was reading an older lap club's newsletter online, and it mentioned that when your slab drops off you are supposed to turn off the saw and not let the rest of the rock's nub feed through. It said that if you let those nubs finish cutting it will ruin the blade? Someone’s gonna have to explain that one to me because it makes no sense whatsoever. The blade just cut umpteen square inches of rock and a little nub is gonna hurt it? Who's gonna tell Auto Shutoff it's obsolete now? |
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70karmann
starting to spend too much on rocks
Member since February 2011
Posts: 190
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Post by 70karmann on Jan 13, 2018 23:48:35 GMT -5
I just start up the old Lortone Pro 8 and grind them away.
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Post by Peruano on Jan 14, 2018 8:28:48 GMT -5
I have read the same advice that the OP cited, but I doubt that it relevant to a modern world. I believe its related to recommending that its not good to cut with only one side of the blade. Without the rock slot your blade may be deflected slightly and contribute to a dished blade. This might be more relevant to a real thin blade. I believe this advice may be related to the admonition to not grind or cut with only one side of a trim saw blade, and when trimming by hand to start your cut perpendicular to the rock surface and then adjust your direction of cut once the blade is in a significant notch (again avoiding deflection). Just guessing and not really concerned about cutting off the nibs in the saw when I'm patient enough to let it run on out. I do cut most of mine on slabs with the trim saw and certainly use the side cutters to nip them off when its more convenient. You really should remove them so your slab lays flat on the trim saw.
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Post by 1dave on Jan 14, 2018 9:18:50 GMT -5
Aggressively pushing a rock thru could be problem. Slow advance in a vise never.
The problem is fractures that break half way thru. THAT can destroy a blade.
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Post by mountainshadowrocks on Jan 14, 2018 18:45:34 GMT -5
I was reading this newsletter, www.lapidaryclub.org/graphics/sep2012_cutting_remarks.pdfIn the newsletter, it says; "Diamond blades nearly always end a cut by breaking the material at a notch, which can distort or ruin the blade if allowed to keep feeding (the work is at an angle to the blade, right? No good!)" I have been running my nubs through, but can see where that would wear one side of the blade faster than the other. Ironically, as I was cutting some labradorite yesterday, my slab dropped between the blade and the slab holder and bound my blade so badly I had to remove it to get the slab out. This is the one complaint I have about this 14" Panther saw - it always kicks off my slabs against the blade or anywhere other than where they should be dropping... |
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Post by 1dave on Jan 14, 2018 20:46:35 GMT -5
I was reading this newsletter, www.lapidaryclub.org/graphics/sep2012_cutting_remarks.pdfIn the newsletter, it says; "Diamond blades nearly always end a cut by breaking the material at a notch, which can distort or ruin the blade if allowed to keep feeding (the work is at an angle to the blade, right? No good!)" I have been running my nubs through, but can see where that would wear one side of the blade faster than the other. Ironically, as I was cutting some labradorite yesterday, my slab dropped between the blade and the slab holder and bound my blade so badly I had to remove it to get the slab out. This is the one complaint I have about this 14" Panther saw - it always kicks off my slabs against the blade or anywhere other than where they should be dropping... I have slotted a piece of plastic so it can be slid over and tightened tight against the side of the blade so nothing can slide between. a couple of short pieces of rubber tubing cushions the slabs as they fall. |
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Post by Rockoonz on Jan 14, 2018 21:05:39 GMT -5
I was reading this newsletter, www.lapidaryclub.org/graphics/sep2012_cutting_remarks.pdfIn the newsletter, it says; "Diamond blades nearly always end a cut by breaking the material at a notch, which can distort or ruin the blade if allowed to keep feeding (the work is at an angle to the blade, right? No good!)" I have been running my nubs through, but can see where that would wear one side of the blade faster than the other. Ironically, as I was cutting some labradorite yesterday, my slab dropped between the blade and the slab holder and bound my blade so badly I had to remove it to get the slab out. This is the one complaint I have about this 14" Panther saw - it always kicks off my slabs against the blade or anywhere other than where they should be dropping... My 12" Nelson was quite the slab slinger too. Solution was to bend the sheet metal tray that the slabs are supposed to drop into so it was closer to the blade, did it while the blade was taken off to clean the saw. I cut thin slabs at times, so it was as close as I could get it without touching, but for normal 1/4 inch slabs I think I would try for about 1/8 inch. As far as the nubs go, I usually shut off a saw if I hear the slab drop, but if I'm not close to the saw I don't worry about it too much. |
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Post by woodman on Jan 21, 2018 12:16:24 GMT -5
Some nubs are always there but if you are getting large nubs, it may mean that you have a misaligned blade.
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