About how fast does the JOBO drums turn? What does the change in direction really do? I am on the same basic track as the OP and need some info...this is a nice set up so far :)
Change in direction is used so that the chemicals are mixed randomly, instead of exhausted developer "dragging" along the film which could cause some streaking. When it stops suddenly, the chemical in motion spreads everywhere.
You could offset the rollers so it rocks instead of reversing if you making your own
Can I ask - how are you making the motor reverse direction?
Depends on the sort of motor, if its a permanent magnet DC motor then just reverse the connection with a relay and timer.
But still this would yield a rather constant flow (depending on the cam though). Reversing would induce turbulances and thus more mixing of the processing solution.
I heard of someone using the wheels of an RC car as a rotation motor. I wish I was handy with electronics...
This is AWSOME! I, and perhaps many others, would apprete it very much if you did a write up on the build. A site like instructables.com is a really easy way to make such a write up.
Thank you so much for sharing this!