My turn for help with Pulse multiplier for test rig.

[Neale]

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

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.

[Robin Hewitt]

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.

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

[EddyCurrent]

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.

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

[EddyCurrent]

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'.

[irving2008]

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

[JohnHaine]

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.

[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.

[Jonathan]

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.

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 ;)

[magicniner]

Given the above refined spec with direct ratio not required, rather than a pulse multiplier I'd suggest a frequency generator with the output frequency programmed to ramp up and down quickly but smoothly with the running target frequency output based on the pulse frequency input.
I'm afraid I don't have my PIC programming system set up at the moment, it's all in a box somewhere in the loft :-(
If only I had an Australian Bloke's Shed, then I could have all my toys out at once!

- Nick

[irving2008]

A possible issue with the mechanical option is potentially the pulse rate the wheel can achieve. One datasheet shows one such wheel has a fixed 800uS pulse per detent, which limits it to 125 steps/sec or 75rpm.