sambiguous
off to a rocking start
Member since March 2024
Posts: 1
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Post by sambiguous on Mar 31, 2024 4:20:29 GMT -5
Hi guys, I'm about to build a basic lapidary drop saw with either the 16" or 18" mk 303. Mainly to cut rocks in half to create suiseki or viewing stones. The stones in NZ are pretty hard. Grossular garnet, argillite, nephrite...Mohs of around 6.5 to 7ish. I've been offered a quality industrial 1450 rpm motor at a good price. My question is will this motor work for my purpose or would I be better off waiting for a 1750 rpm? I can source different wheel sizes for the belt I'm assuming...thanks for your help guys
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Post by liveoak on Mar 31, 2024 6:19:36 GMT -5
I can't help you with your motor, but I'll tag Rockoonz for you. Lee knows a bunch about saws.
Welcome to the forum from NW Florida.
Patty
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Post by Peruano on Mar 31, 2024 7:33:28 GMT -5
Hi guys, I'm about to build a basic lapidary drop saw with either the 16" or 18" mk 303. Mainly to cut rocks in half to create suiseki or viewing stones. The stones in NZ are pretty hard. Grossular garnet, argillite, nephrite...Mohs of around 6.5 to 7ish. I've been offered a quality industrial 1450 rpm motor at a good price. My question is will this motor work for my purpose or would I be better off waiting for a 1750 rpm? I can source different wheel sizes for the belt I'm assuming...thanks for your help guys F you go to the mk diamond website they have subtopic on speed recommendations for various sizes of blades. |
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Post by chris1956 on Mar 31, 2024 9:07:49 GMT -5
Welcome from Missouri.
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Post by Rockoonz on Mar 31, 2024 11:16:38 GMT -5
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Post by Rockoonz on Mar 31, 2024 11:23:35 GMT -5
From the chart above you can see that your motor speed is at the top end for a 16" blade and too fast for the 18. If you will use straight water for a coolant you should consider a different blade, these are made to use with oil.
With a blade that size a drop saw needs a dampener for the arm that the blade drops on, to control the speed and prevent bouncing.
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john19
off to a rocking start
Member since March 2024
Posts: 12
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Post by john19 on Apr 1, 2024 0:49:30 GMT -5
I can't help you with your motor, but I'll tag Rockoonz for you. Lee knows a bunch about saws.
Welcome to the forum from NW Florida.
Patty
16" to 18" should be running about 900 to 1000 RPM. 1450 is a bit too fast |
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Post by Rockoonz on Apr 1, 2024 2:39:32 GMT -5
I can't help you with your motor, but I'll tag Rockoonz for you. Lee knows a bunch about saws. Welcome to the forum from NW Florida.
Patty
16" to 18" should be running about 900 to 1000 RPM. 1450 is a bit too fast With a 301, old or new style, or a crimped edge budget blade, I agree. With the 303 and most of the clones I run them in the speed range they recommended. The chart I posted is the one from the MK and BD websites, screenshot that I saved and cropped since I imagine the wesites may disappear. If the saw hollers I slow them a little, but I've only had to run one 18 below 1000 rpm, cut finish is so much better with RPM faster and feed slower. |
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john19
off to a rocking start
Member since March 2024
Posts: 12
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Post by john19 on Apr 2, 2024 1:53:31 GMT -5
16" to 18" should be running about 900 to 1000 RPM. 1450 is a bit too fast With a 301, old or new style, or a crimped edge budget blade, I agree. With the 303 and most of the clones I run them in the speed range they recommended. The chart I posted is the one from the MK and BD websites, screenshot that I saved and cropped since I imagine the wesites may disappear. If the saw hollers I slow them a little, but I've only had to run one 18 below 1000 rpm, cut finish is so much better with RPM faster and feed slower. I agree with this for slab saws and certainly see the same results with our similar segmented blades , but his question was pertaining to a drop saw, and I think running that fast would be likely to introduce more hopping and at that rpm hopping would likely damage the blade. |
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Post by Rockoonz on Apr 2, 2024 3:14:07 GMT -5
With a 301, old or new style, or a crimped edge budget blade, I agree. With the 303 and most of the clones I run them in the speed range they recommended. The chart I posted is the one from the MK and BD websites, screenshot that I saved and cropped since I imagine the wesites may disappear. If the saw hollers I slow them a little, but I've only had to run one 18 below 1000 rpm, cut finish is so much better with RPM faster and feed slower. I agree with this for slab saws and certainly see the same results with our similar segmented blades , but his question was pertaining to a drop saw, and I think running that fast would be likely to introduce more hopping and at that rpm hopping would likely damage the blade. Makes sense to me, so more like the lower end of their speed range then. If he plans to use water like a lot of people do with drop saws I wouldn't use a 303 anyway, more like the Hot Dog/Agate eater. I have not used drop saws at all so far, I'll be rebuilding a 14" SLIK sometime this year so any tips would be appreciated. |
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