Jobo CPE-2 motor overhaul

[Lee L]

Something else just occurred to me, not having handled a 2502 rollfilm reel before, and just having looked them up online. The 2501 rollfilm reel, in addition to being 'open-sided' with only a few radial support arms, takes up to two rolls of 135-36 film on a single reel, loaded end-to-end. This means that the distance between layers of film loaded on the 2502 reel (which only takes one roll of 135-36) is approximately double of that of the 2501 reel. That and the open-sided design would go a long way to explaining why I was getting the surge/flow marks from the radial support arms as well as extra edge density on 35mm and 120 film. With closer spaced film and open sides, the developer would tend not to flow as readily at the center of the film and more readily at the edges with the 2501 reel, creating a difference in effective agitation from center to edge. That may also be the reason that the increased turbulence from the higher speed worked better with the 2501.

Given that the 2509 and 2501 reels were fairly quickly replaced with significantly different designs and different procedure recommendations, I'd have to say that I was working with 'beta' hardware all 'round, and that my results are probably not repeatable with the later 2509N and 2502 reels. I'll accept donations of the final releases of these products via PM. Bet I could reproduce my problems with the 2501 and perfectly good results with the 2502 reels side-by-side on the same run.

Lee

 

[jon.oman]

This thread is interesting. I also am worried that my CPE-2 motor will fail someday. It would be nice to pick up a replacement motor before that happens!

 

[Sirius Glass]

Ditto for a CPP 2.

Steve

 

[RalphLambrecht]

I'm sure there must be several more people feeling in need of a replacement motor, even if they want it just in case. Why don't we ask the Joboman to find alternative motors, modify them and sell them to us?

 

[hoffy]

Ralph, hopefully I can help with that. I have sourced a motor locally and I am waiting for it to arrive. There will be modifications required to make it fit, but hopefully not too much cutting of the unit. The only drama's (for others) is the rotation speed, as I am using a different power supply, I can regulate this better.

What I would like, if anyone is confident and handy with a multi meter, is for some one to measure the voltage across the motor at the different speeds and report back. Then I should be able to work out if my solution will work for others.

Cheers

 

[Lee L]

What I would like, if anyone is confident and handy with a multi meter, is for somoe to measure the voltage across the motor at the different speeds and report back. Then I should be able to work out if my solution will work for others.

Cheers

This is for a CPE-2 Artikel #4060 apparent serial no. 3811.

No load conditions.

11 VDC - motor speed 1 - 25 RPM
22 VDC - motor speed 2 - 65 RPM

Lee

 

[hoffy]

Cheers for that Lee

 

[Lee L]

Cheers for that Lee

You're welcome. Only took a couple of minutes. I'm interested to see what you come up with as potential replacement hardware.

Lee

 

[RalphLambrecht]

APUG is a wonderful thing! An international photo project, I love it!

 

[CatLABS]

did you ever install the new replacement motor? how did it come out?

 

[hoffy]

It's still on it's way!

 

[hoffy]

Well, better late then never. I picked up my little replacement motor from my Brother the other day(he works in the engineering industry and 'got me a good price'). I finally got to having a look at it compared to my CPE2. Unfortunately it's EXACTLY the width of the controls compartment, so to play it safe, (plus I need to space it out past the rocker switch for reversing direction), I will need to cut a hole in the back side to make it fit. I also have to make a coupling and a spacer (to clear the switch) but I already knew that (do you know how hard it is to find an electric motor with a long metric shaft in this country???).

I also connected it to my power supply and measured the rotation. @ aprox 18V, it was rotating at exactly 60RPM. @ aprox 9V, it was rotating at around 35RPM. This means that it should suit me perfectly, as I am no longer using the PSU that is in the unit. I would say, though, that if anyone was to follow my lead, but use the original 22V PSU, they may need to find something a bit slower, or throttle the motor back.

I'll keep you posted....hmmm, now to find someone with a lathe....

 

[morganharri]

I have also replace my CPE-2 With CPE-2 plus and it is working very well.

 

[CatLABS]

I have also replace my CPE-2 With CPE-2 plus and it is working very well.

CPE2 = 24V
CPE2+ = 12V

?

 

[Sirius Glass]

I have also replace my CPE-2 With CPE-2 plus and it is working very well.

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