motor sizing?
Hello all! I'm new to the cnc retro world. And wanted to purchase a CNC trainer lathe. However I decided that it would be more beneficial in the future to build a 4th axis . I am curious about motor sizing in regards to weight holding/stopping/starting. I purchased my mill already converted and need to install limits and homing switches. And for some reason my mach 2 doesn't show any activity in the encoder portion of the screen. ( but that's a different issue)
Any insight to proper sizing to hold ( start / Stop precisely ) will be greatly appreciated. I'm guessing my maximum weight to be 10#.
I would only like to build this unit once. No upgrades for heavier product or motor inefficiencies.
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Re: motor sizing?
Are you providing a planetary gear for this rotary axis, or just sticking a chuck on the end of a motor? With the gearing, you can use a much smaller motor than with the direct-drive plan. The ratio would factor in the torque required. The weight of your workpiece isn't that significant; it's the force required to turn it while cutting that makes more difference.
[FONT=Verdana]Andrew Werby[/FONT]
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Re: motor sizing?
There is a sizing program on the Kollmorgen site that used to be very useful for sizing.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
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