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Post by henry180 on Jul 10, 2020 13:20:37 GMT -5
Attached pic, alumilite clear slow, 60 lbs in pressure pot for 24 hours, 1 week before turning. Am new to resin turning but been turning wood for some time. Any suggestions as to what caused, and how to prevent the tear outs? I tried easy wood tool round cutters, and conventional bowl gouge, both sharp. 1800 rpm's, light pressure. Thanks in advance for your help. Attachments:
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Post by Brian on Jul 14, 2020 21:40:40 GMT -5
Carol at Alumilite has asked that you please give her a call at 1 800 447 9344 (M-F reg bus. hrs.) to further discuss the issue that you are having. Your patience on this matter is appreciated.
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Post by smccusker1 on Aug 1, 2020 22:32:43 GMT -5
Try a negative rake carbide from easy wood tools. This should fix your problem right away! You do need to be a little less aggress than with turning wood. Once rounded, you can get the speed up which can also help.
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vtdw
New Member
Posts: 3
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Post by vtdw on Aug 28, 2020 12:45:35 GMT -5
The same thing has happened to me. I find that keeping my cutting/shearing angle proper is paramount!! Once I ‘hear’ that little tool chatter it nearly always means chip/tear out.
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Post by rstone on Sept 22, 2020 18:11:50 GMT -5
Try a negative rake carbide from easy wood tools. This should fix your problem right away! You do need to be a little less aggress than with turning wood. Once rounded, you can get the speed up which can also help. This is the correct answer. Negative rake always for resin.. The circular carbide is notorious for resin tearout, you'll be picking chips out of your underwear with that tool. The square negative rakes work great. Currently they are selling for about $20 each but you want to turn resin, they are almost a must have.
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Post by LawnBoy on Sept 26, 2020 1:09:37 GMT -5
I don't use negative rake tools. I use standard hollowing tools and gouges. No need to buy new tools when the ones I have work great. I understand the geometry.
VTDW is right. Regardless of what tool you are using, you must keep the angle the tool conacts the work at less than 90 degrees. In other words, you have to scrape. If you try to cut (90' or more), the elasticity of the resin will cause the tool to chatter.
Negative rake simply decreases that angle for you. So will lowering your toolrest slightly, or lifting the handle of the tool.
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