Jobo CPP motor with pictures.

Edtog · Nov 29, 2010

Here are a couple of pics of a Jobo CPP motor for anyone who's interested...So anyone know if it's a windscreen motor or not? Be good to finally know. (White cable should be green, thanks to Ed Bray for pics)

GeorgesGiralt · Nov 29, 2010

Yes it is a windscreen wiper motor. The black cyndrical "thing" is the actual motor, and the metal flat "thing" is a reductor to reduce speed.
The oscillating movement is made with the coupling of the wipers.
This motor was made by SWF which has been absorbed by bigger than them. Unfortunatelly they bought them to suppress a competitor so the production line went down....

ic-racer · Nov 29, 2010

These things are made in a myriad of mounting configurations, so I suspect one that matches those mounting holes could be found. I suspect that shaft is unique to the Jobo application with most wiper motors having threaded, splined or "D" shafts.

Seems like a project that would involve mating a new motor to the existing worm drive or making a shaft adapter and perhaps a 3 hole mounting adapter. Rebuilding the motor would be my first try. If the arm is blown, it could be re-wound. New brushes could be adapted and made to fit if needed. If the commutator came apart, that may be a terminal condition.

sandholm · Nov 29, 2010

Yes, i replace a motor in one of my Jobo, and i grabbed a similar motor and then i had to do some adaptor brackets to fit the motor, but it works perfect. So any motor with the same specification will work (if you tweak it a tiny bit)

GeorgesGiralt · Nov 29, 2010

If you plan to change the motor, bear in mind that you have to get the same rotation speed otherwise you could make butter in the tank....

domaz · Nov 29, 2010

It would be interesting to test the Voltage draw and no-load current of the motor. That would make it easier to find a replacement. The gearing, however, is probably a unique item and not easy to replace.

ic-racer · Nov 29, 2010

domaz said:
It would be interesting to test the Voltage draw and no-load current of the motor. That would make it easier to find a replacement. The gearing, however, is probably a unique item and not easy to replace.

Unless its for a Lamborgini Countach or something, most windshield wipers would be driven by similar motors running on 12V. The gearing is also probably right from the windshield wiper application with a different shaft.

Sandholm: is that shaft on that gearbox the same shaft that the gear or magnet screws onto, or is there another shaft inbetween?

AgX · Nov 29, 2010

The Jobo one runs on 24V (if I read that printing right), so one would have to look for truck wiper motors.
Can that motor be departed from the gearbox?

GeorgesGiralt · Nov 30, 2010

The early Jobo used a coupling for the magnet based on a claw. Later they changed for a more traditional screw fixture.
I think that, due to the fact that the wiper was for a truck, the coupling has to be able to slip. (when the big wipers get stuck by, say, ice, it would destroy the gearbox it you allowed a very firm coupling between the gearbox and the wiper mechanism.)
I do not think it would be so easy to replace the whole motor/gear. Space is limited in the Jobo head, and some gearboxes are quite big today. Last but not least, wiper system has become more complicated with a multitude of speed and intermittent wiping which is often made into the motor itself now... But I may be wrong, and maybe there are still plain motors for truck out there...

sandholm · Nov 30, 2010

ic-racer said:
Sandholm: is that shaft on that gearbox the same shaft that the gear or magnet screws onto, or is there another shaft inbetween?

The problem were not to fix the motor to the processor (it was a screw mount) the problem were space and to found a motor which had a same shaft from the gearbox as the jobo. After a bit of searching at the local junkyards i found on, were the shaft were longer but the same diameter, then it was just a mater to fix the correct length of the shaft and mounting brackets. The speed were different, but I fix that by measuring (with the original motor) the speed at 1/2/3.. and then i just made a table what a setting 2 now means.., not that hard.

Current i am working on a new processor unit which will be controlled by an Arduino board, it will be able to handle C-41/E-6/BW and ilfochrome, everything will be modual and the system will be able to handle replenishing. The system will also be able to handle the temperatur much more closer then the jobo system did and plans is also made to have an automatic NO2 gas delivery system to the chemical bottles to make them last longer. This processor will not be powered by a windscreen wiper but an regular 24 volt DC motor.

cheers

paul ewins · Nov 30, 2010

It's a 24v motor, but the PS supplies 16v. Car electricals are nominally 12v, but usually get 13.8 when the battery and alternator are healthy.

Actually, it might be safer to say that the one in my CPP is 24v, the same as the one shown - that doesn't mean they all were.

I've got a different problem in that the motor is fine but the motor control circuit is dead. I've bought a generic motor control unit and will see how that goes.

Sandholm, I'll be interested to see your new processor.

Jobo CPP motor with pictures.

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