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Quick and Dirty X2 Mill feed

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klank:
A bit more on "centre off" pots - Circlip suggested finding a pot with a centre detent - similar to those on audio amps for tone control/balance. Trouble is I think most of those are Log pots - a Lin pot is needed in this application.
Maybe there is one listed somewhere - 100k (I think) is the right value.

Darren:
Umm, you might have a job finding one of those esp a lin one.

My amps are "pure" so never used one,

Where to look,

Farnels
CPC
Maplin
Rapid
Cricklewood

There are others, peeps please add to the list..... :thumbup:

Darren:
RS
Farnels
CPC
Maplin
Rapid
Cricklewood

Darren:
Over the pond but it seems they are available

http://www.guitarpartsdepot.com/100K-100K_Pot_Linear_Center_Click.html

Now to find one on this side  :)

klank:
Just to finish this off:-

I cut to length, drilled and counter bored the "input" shaft for the motor shaft/flatted end, cross drilled and tapped M4 for a couple of grub screws to catch the flat on the motor shaft and fitted it up.





To stop the motor "kicking" when under power I fitted a length of M6 studding to one of the mounting lugs and drilled the end plate to match for a free sliding fit.
To prevent the motor pulling out of the shaft when dis-engaging, a couple of M6 nuts, thread-locked at the right place on the stud seem to do the trick.

Engaged


Disengaged


I admit this is all very simple and very crude compared to the lovely projects shown on the other thread, but it will do for my needs.

In case of using suds, I appreciate the motor is (probably) not water-proofed - I can either cover it in a plastic bag, or it is really quick and easy to pull off - just undo the grubscrews and unscrew the stud form underneath.

I am not 100% happy with the present pwm motor control - as Darren pointed out, the centre-off position can be hard to spot if in a hurry. A centre detent pot would do very well here - but none of the usual suppliers stock one over here. Motor control and slow speed is excellent however.

If anybody wants a selection of ex-car 12v motors (including wwm's) I would be delighted to pass them on to a good home.

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