My turn for help with Pulse multiplier for test rig.

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Originally Posted by EddyCurrent

Fit a hand crank to the rear stub shaft of the stepper motor.

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That works on so many levels, a complete solution, I am truly in awe :beer:

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Originally Posted by Robin Hewitt

That works on so many levels, a complete solution, I am truly in awe :beer:

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Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

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Originally Posted by Neale

Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

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Like me you are forgetting Gotama's advice to Siddhartha... "Beware of too much cleverness".

When I was about 20 years old my work colleagues presented me with the (fictitious) Duke of Edinburgh Award for 'Use of Stone Age Tools'.

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Originally Posted by Neale

Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

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Or, when the handle stops turning, you've hit the end stops.

OK, here's version 0.1 for discussion....

Attachment 12250

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Originally Posted by irving2008

Tbh my approach just generates n pulses for each wheel pulse at a rate that's fast enough to finish before the next wheel pulse.

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As touched upon earlier, the 'jitter' this adds to the pulse stream will reduce the maximum feedrate somewhat as the motors wont run as smoothly. How much is hard to say, but it could be a problem...

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Originally Posted by irving2008

OK, here's version 0.1 for discussion....

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Direction required?

More and more it looks to me that the best approach is a mechanical step-up! Trying to multiply the number of pulses electronically is inherently the wrong way to go.

Fix the mpg down on a board and mount a larger mdf wheel next to it on an improvised pivot. Use a wide rubber band as a belt . Should be relatively easy to get a 5:1 step up.

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Originally Posted by JohnHaine

Fix the mpg down on a board and mount a larger mdf wheel next to it on an improvised pivot. Use a wide rubber band as a belt . Should be relatively easy to get a 5:1 step up.

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Better still, connect the rubber band to the stepper motor to get a closed loop system. I'm sure you'd get positive feedback for that idea ;)