The project was designed at first with 2 motors on the y axis, and it weight apx 200 pounds, but the fact that I could not mecanically sync the two ballscrews involved, had me worried and I.ve decided to go with one screw in the middle, as any kind of failure does not have the potential to break or bend something. Adjusting each motor to a certain speed seems to work fine. I did not have any problem so far with the supported rails and bearings, or screws and motors, just a limitation in speed, as a hard stop at a high speed will shake the whole thing. The part of the gantry moving left and right weighs apx 65 pounds (30 kg), while the whole gantry apx 240 pounds (110kg). Nema 34 motors (overkill for z axis, but i.ve bought a kit of 4 a few years ago, I.ll get a nema 23 kit sometime in the future). It is a 5/5 machine (1.5m/1.5m) made of 2.3 inches (6cm) steel tubing, and aluminium plates. Here are the photos I.ve promised 4 weeks ago. The extra 1.7% current should not be a problem Then I expect you can safely set the motor current to 5.7A Setting the motor current to 4.9A instead of 5.6A will do two things Set to ON the motor will run hotter but should be OK I expect sw4 sets the current reduction when the switch is set to OFF and the motor is idle ( not being stepped )
The motor can safely run at 70 to 80 degrees C - too hot to touch !Ī quick look on line did not find clear instructions for the setting of sw4īut going by a photo of your DQ860MA driver So the current does not go up when you mechanically load the motor as you may of expectedĭepending on which manufactures data sheet you look at With stepper motors the motor current depends on what you set by the DIP switches - sw1 to sw3 I can not see any thing wrong with how the stepper driver is set up
0 kommentar(er)
