hi
I can see from the last mail,that you could have had a sound sleep and make the group get the answer :)
anyway.. your question on doing so to make it run very slow ..
Once I made a x-t writer , it used among other things a cassette deck to move the paper with the pinch roller..and I needed times as 10 mm /hour.so I gave the motor so small pulses that it turned less than 1 revolution .. here was the belt also a problem..but if I turn it on now, I'm sure it works.
This was ,I think it was made with a 555 and a driver transistor.
So you search for this circuit and then try it.
alex
--- In Homebrew_PCBs@yahoogroups.com, Richard Spelling <rls@...> wrote:
>
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> Went to bed tired and annoyed I couldn't easily find a slower gear motor
> for the laminator.
>
> Dreamed about building a magical speed controller that would let me run
> the existing motor infinitely slow.
>
> Realized I could use "temporal kinetic and thermal stabilization" since
> it's a worm gear motor.
>
> I.E., I build a standard PWM controller but set the frequency real
> sloowwwwww.
>
> Imagine having the speed turned down real low. Along comes a pulse. The
> motor spins up and turns the worm screw a revolution or two, then spins
> down. The board advances a fraction of an inch. An in-determinant amount
> of time later, along comes another pulse.
>
> Yes, it's "jogging" the board forward and not continuous motion, but
> between jogs it sits between the rollers long enough for the heat to
> transfer through the paper.
>
> I'm thinking about 10Hz.
>
> Whatcha think? Just another crazy idear from Richard?
>
> Now I just need to build the board.
>
> Wait a second, I need my laminator to build the board to fix the laminator!
>
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