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Unread 28-02-2003, 05:13
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SiliconKnight SiliconKnight is offline
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Motor duty cycle / advice on a non-FIRST project

Hi all,

During the build period (once upon a time), someone on my team made a comment, "THat's crazy, if you looked at the poewr output of the Chippy and the new drill motors, they are almost identical. Why is the chippy soooo much bigger?"

I ventured a guess that the drill motor is probably not designed with continous duty in mind, while the chippy, well, I don't have the info handy, but could probably run longer without overheating. Are there any other theories or explainations out there?

Reason I asked, is I am considering building a new milling machine spindle for our TAIG CNC mill. Design criteria for this milling machine spindle: Different gears (can be done with belts, just like the Bridgeport J-Heads), to give different speed. I want high torque at lower RPMs to cut steel (we would like to cut our own gears next year), but also retain the ability to run the spindle at 10k RPM if not higher for PCB routing and for high speed machining of aluminum. Because it's a small machine that we'll potentially use in the 2004 season, it *has* to be able to run almost continous duty. The motors I've considered are:

* A replacement motor for a Chinese-made mini-mill, such as those on littlemachineshop.com. Model shown below is rated for roughly half horsepower

http://www.littlemachineshop.com/pro...ProductID=1311

* A drill motor. Hey, after 2 build seasons, I know the trannies in and out. This baby looks beautiful, from DeWalt (if only if we can get that in our kit!) :-)

http://www.botparts.com/product_info...roducts_id=195
(2 HP motor, 24VDC, 68Amp nominal, 192 in-lbs stall torque)

* The CIM / Chippy motor. It's not too shabby at half horsepower, and it seems pretty closely match to what Sherline is using default in their mills, which is actually fairly respectable a motor.

* Wheelchair motors. They don't seem to be made for high RPM though.

Any comments / suggestions? How is duty cycle determined?

-=- Terence
__________________
Terence Tak-Shing Tam <ttstam@u.washington.edu>
Engineering Team Captain, SWAT Robotics
http://www.swatrobotics.org
 


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