3 axis pick and place

Damien Allen

I am aiming to build a 3 axis pick and place machine and I was wondering what is the main advantage of servo motors over stepper motors because there is a large price difference and control requirements. Speed isn't really an issue here but cost and +/- 0.5 accuracy are important.

any thoughts or comments?

Searider

There are several differences between a Servo Motor and a Stepper Motor. With a Stepper motor you can control the rotatation very presicely this can allow you to have great accuracy and repeatability with only some sort of sycronization process at the begining of each sequence of actions. With a servo motor you do not have any built in accuracy and would have to add a positional feedback subsystem. Steppers probably can be purchased with much higher torque than a servo. Servo's can be much easier to control than a Stepper. There are more things but this should get you started. I have found a lot of good information on both steppers and Servo's on the web.

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Searider

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kelvin james

Ah yes, the 'ol servo vs. stepper debate, many opinions. To make it short, what you are trying to do is not any different than making a 3 axis mill, ckeck out sites like cnczone for info on diy stuff. The motor / electronics is not too hard, it gets a little tougher with the mechanical end. Nice thing about a stepper setup is it can be controlled by a pc, and the software is readily available. Servo systems are generally used on industrial machines with a high torque requirement, and need the positional feedback. And the control system gets complicated, having to drive the motors and monitor the encoders at the same time. Both have their pros and cons, with steppers you just have to be aware of the limitations of the motors, like speed and torque. Most of the resolution factor involves the mechanical assembly with the lead screws, nuts and bearings.

Damien Allen

I've done some research and I think steppers should do the job. As Kelvin as pointed out the mechanical side is difficult. Does anyone know where I can purchase CNC type axis slides?

kelvin james

Look at ebay, all kinds of parts for a reasonable price. While you are there, have a look at the zenbot. It may be possible to convert it to your needs.

parts-man73

I'm working on a small homebrew CNC mill based on these general plans
www.instructables.com/id/Easy-to-Build-Desk-Top-3-Axis-CNC-Milling-Machine/

but I'm going to attempt to use some bottom mount drawer slides in place of the aluminum channel that he suggests. I just wonder how much play the Drawer slides will have.

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Brian

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morgandeo

Hi friend,
Actually i have find out information on pick and place machine for my industry for packaging department.there is requirement from this department so i found one of the best pick and place machine for our company.I haven't more information about pick and place machine.If you want to get more information on that machine i will give you the resource. I am sure it's very helpful to you.

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Pick and Place Systems
" Other people can stop you temporarily. You're the only one who can do it permanently."

SRLM

You could use a flatbed scanner for one or two axis. These are already built and ready to use, and are cheap (free) if you find the right time and place.