an X-Y stage implementation based on the mayline bar, (ancient drafting tool)

[John Griessen]

http://corexy.com/index.html

describes a Mayline bar like system of motion by two motors. It has no absolute position
measuring, just counting of steps in code, so the motors could get out of whack under load.

You could add a belt tension sensor to recover from that though...

Might be good for assembly pick and place of mostly 2-D stuff like circuit boards.
Cost can be very low. It's informal OSHW with soldworks files and IGES files of the mech parts.

No code per se.

[Joshua D. Johnson]

T

hat's exactly how etch-a-sketch was done and we had a Stratasys that driven similarly. Not sure if code would need to change, you'd be limited by weakness of belts and pulleys though. You could try cutting with a flex shaft type device so no motor was out on gantry. Seems like the Stratasys had some springs to maintain tension.

JOSH

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[John Griessen]

On 06/22/2013 02:05 PM, Joshua D. Johnson wrote:
> T
> hat's exactly how etch-a-sketch was done and we had a Stratasys that
> driven similarly. Not sure if code would need to change,

Yes, motor directions have some reverses compared to X motor Y motor set ups.

you'd be limited
> by weakness of belts and pulleys though. You could try cutting with a flex
> shaft type device so no motor was out on gantry.

The drive motors are stationary, so do not contribute to inertia.
They put a high speed cutter on the driven gantry. I don't see this as
a metal cutter, just for lighter duty low low costs. It uses bushings
and guides to allow decent accelerations while staying on a desired path.

[James Jones]

looks like 3d printing, 3d scanning, LCMMs, contact probe etc...

although laser engraving and similar processes offer little resistance to the positioning mechanism....

[John Griessen]

On 06/23/2013 10:52 AM, James Jones wrote:
> looks like 3d printing, 3d scanning, LCMMs, contact probe etc...
> although laser engraving and similar processes offer little resistance to
> the positioning mechanism....

They use guide bushings so it can push some, and position will not oscillate after a move.
Would be fine for PCB assembly, light routing.

Is LCMM for "Life Cycle Material Management"?

John

[James Jones]

Laser Coordinate Measuring Machine