Hi,
I’m looking for a motion control package that will rotate a cylinder +/- 180 degrees at 20 rpm, be able to lift a 2lb weight, and stop and start smoothly.
I need it in a week.
It should be easily programmable (intuitive HMI/GUI)
It should cost <$300
Can you assist?
Thanks.
Best Regards,
Chris
To confirm, you need a system that will both rotate and move linearly (“lift up a 2lb weight”)?
Do you need to control position or just direction and speed?
While we wait for your reply, we suggest taking a look at the following article:
robotshop.com/blog/en/how-to … ors-2-3703
Hi Coleman,
The system only needs to rotate a shaft of approximately 0.5 inches, from which the weight is suspended. The weight will move up and down, as the cycle progresses.
I need to control position in as far as 1 cycle = +/- 180 degrees (180 in one direction, back to zero, and 180 in the other direction, back to zero, etc.). I’d like the starts, stops and reverses to be somewhat smooth, or at least not abrupt.
This is an industrial application that will see 150k+ cycles.
It will run for 1500 cycles at a time, for roughly 1.25 hrs, pausing for ~ 20 min between runs.
Thanks.
Best Regards,
Chris
A stepper motor is likely the best solution, but keep in mind the stepper motors we offer are not industrial quality - they are rated for hobby use.
robotshop.com/en/stepper-motors.html
You would need a stepper motor controller
robotshop.com/en/stepper-mot … llers.html
Ex: robotshop.com/en/phidgetstep … RB-Phi-179 (offers easy to use interface)
“Programming” a specific routine however is up to you - the interface allows for basic control.
Maybe you could point me to your strongest stepper motor (that’s compatible with the RB-Phi-179), and hopefully it would be able to survive many cycles, with a relatively light load?
Thanks.
Chris
What kind of holding torque would I need for this application?
Thanks.
Chris
The most powerful non-geared steppers we offer:
robotshop.com/en/12v-068a-12 … =RB-Soy-14
robotshop.com/en/12v-068a-12 … =RB-Soy-11
You might also consider geared steppers:
robotshop.com/en/12v-17a-667 … RB-Phi-267
robotshop.com/en/12v-28a-333 … RB-Phi-266
robotshop.com/en/12v-17a-416 … RB-Phi-210
As far as holding torque, you’ll need to calculate it.
Is that stepper powerful enough to lift 2 lbs?
To lift 2 pounds, you need to know the lever arm - so what is the diameter of the pulley you plan to use?
0.5"
Chris
You therefore need 2lb-in of torque, or 32oz-in (ounce inches) at minimum.
The stepper motors in the previous reply can provide up to 125oz-in, which should be more than enough.
Keep in mind they consume higher current, so the stepper driver you choose needs to be suitable.
Let’s assume I’m going with the RB-Soy-14 stepper.
Could you recommend everything else I’d need to program and run a simple, repetative cycle (+/- 180 degree rotations), like controller, driver, power supply, etc.
Thanks.
Chris
For predefined motion, you normally need a microcontroller and programming - there are not many interfaces which allow for scripting.
robotshop.com/en/microcontrollers.html
You need a motor controller which can provide 2A per coil
robotshop.com/en/stepper-mot … llers.html
We suggest taking a look at the software available for these (downloadable free on the manufacturer’s sites):
robotshop.com/en/phidgetstep … =RB-Phi-67
robotshop.com/en/me-2h-micro … RB-Mab-157
robotshop.com/en/phidgetstep … RB-Phi-179
I see the RB-Phi-179 can use LabView vi scripts which we do use and write here. Would I even need a micro-controller in that case?
Thanks.
Chris
