02-21-2008, 06:03 PM
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| | | Join Date: Sep 2007 Location: USA
Posts: 740
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Originally Posted by ger21 
Assuming a machine similar in size to Joes 2006, You can get 100ipm with 300 oz motors and 1/2-8 2 start acme running at 36V with a HobbyCNC board. Want to go faster? Get some 5-6amp motors and Gecko Drives, and run them at 15-20x their rated voltage. Faster still? Move up to 400 oz-in 6 amp motors, get some 1/2-10 5 start screws, and a 36V-48V power supply. You can probably get 300ipm from that.
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I have a Joes 2006 running the HobbyCNC kit with 305 motors, and 1/2-8 2 start screws. I regularly run the machine at 100 ipm cutting speed. Rapids have been as high as 250 ipm, but now are usually set at 200 ipm. I once typoed the feed rate at 500 ipm instead of 50 ipm into a Vcarve file. The machine ran at max (250 ipm at the time) until I realized it and hit feed hold in Mach. No problem, and I was using a 1/4" bit at 0.25" cut depth at the time.
I would say Ger21 is correct, at least on a Joes machine and the HobbyCNC kit. I could probably run a little faster if I wanted (125 - 150 ipm), but 100 is comfortable and I have no issues at that speed.
The HCNC motors are rated 305 ounce inch unipolar (which is what the HCNC board will do). If you run them bipolar with geckos you can get 425 ounce inch. Geckos can also deal with a higher voltage supply than the HCNC board. You might get 200 ipm out of the same motors with Geckos, if you up the screw to 1/2-10 5 start.  |
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