Jobo rotary drum for multiple 10x8 sheets of film??

Tom Stanworth · Aug 14, 2006

Anyone know if there is a system for developing multiple sheets of 10x8 film at once with even results, such as one can with 5x4 in the jobo system?

I am not referring to the BTZS tubes but lots of sheets within one drum.

Same question for 5x7 as well I guess!??

Just wondering.....

Tom

MenacingTourist · Aug 14, 2006

I do this with 5x7 and I think my tank is the 3010. I also use a beseler rotating base. Very simple and everything packs away in a small(ish) box when not in use.

I have only used Rollo Pyro dev in mine and it's worked great. The film I've used has been JandC 100/200/400, Ilford FP4 and Efke 25.

wfwhitaker · Aug 14, 2006

The Jobo 3005 Expert drum can be used for both 8x10 and 5x7.

Tom Stanworth · Aug 14, 2006

wfwhitaker said:
The Jobo 3005 Expert drum can be used for both 8x10 and 5x7.

The correct answer would have been, "No Tom. This is impossible. Spare it not another thought"

Now I am going to have to have one (when I have a new darkroom). What processor system is this - what machine as I am very unfamiliar with the JOBO stuff?

Cheers,

Tom

Jim Noel · Aug 14, 2006

Tom.
The Jobo Expert Drums are designed to be put on a Jobo CPA2 or CPP2. These are motor driven with a water bath to assist in controlling temperature. They are expensive, and getting more and more difficult to find. They oftne appear on EBay, but are expensive to ship because of their size.

The drums can also be rolled on a roller base by Jobo, or a person can easily make one. The requirement is that the tanks be rolled back and forth to keep the chemistry moving around the film.
I have friend who rolls one of the Expert tanks in his sink, by hand, no rollers with good success.

Jim

Ole · Aug 14, 2006

Since I've only got a JOBO CPE, I use paper drums (the 28xx series). It works just great - even with E6. I just did another four 13x18cm (5x7" + a little) today, no problems at all.

wfwhitaker · Aug 14, 2006

Tom Stanworth said:
Now I am going to have to have one (when I have a new darkroom). What processor system is this - what machine ...?

I use my 3005 with a roller base made expressly for the purpose. Works well for me. Unlike the drum, it's fairly inexpensive.

Certainly a major reason for using a Jobo drum in the first place is that you don't need a darkroom, only a dark place to load it. That could be a changing tent. Everything else is done in the daylight.

don sigl · Aug 14, 2006

I got a jobo 3005 expert drum,(new and pretty expensive), a cheap beseler rotating base (very cheap on ebay), and a cool variator for adjusting router speeds (very cheap new on one of the woodworking sites MCS, or Rockler). I use Pyrocat and have had considerable success with 8x10 in the 3005 drum. The real money saver was the variator, this thing was made for slowing down single speed routers, but works great for slowing the the Beseler based down to a creeping rate. This is what made the difference. And turned out to be a lot cheaper than a jobo processeor.

MenacingTourist · Aug 14, 2006

Don,

How did you incorportate the speed adjuster? Do you have a link to one of these items? I would love to slow down my Beseler roller base and your idea sounds perfect.

Thanks,

Alan.

don sigl · Aug 14, 2006

MenacingTourist said:
Don,

How did you incorportate the speed adjuster? Do you have a link to one of these items? I would love to slow down my Beseler roller base and your idea sounds perfect.

Thanks,

Alan.

Alan:

You can get one at rockler .com search for a router speed control.
The better buy is at MLCS http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/speedcon.html

I got one of these and it works great. Just plug it into the wall and plug the roller base into it. You can then adjust the speed by moving the variator. The only catch is that the speed change won't be contiuous. I find that I get full speed, a medium slow speed and a slow speed. The volume of chemistry will affect the speeds, so you will have to adjust the variator based on the weight of the drum. This is because the variator reduces the amount of power getting to the drum base. My dad is a cabinetmaker, and told me about this little gadget. Interestingly enough, the thing is not very effective for use in woodworking, because the reduced speeds reduce the torque in the router, and make the cuts very inconsistent. My father threw his away. I'm keeping mine.

Regards,

Rolleiflexible · Aug 14, 2006

Will wrote: "The Jobo 3005 Expert drum can be used for both 8x10 and 5x7."

In fact, though Jobo tells you the 3005 can accommodate only five sheets of 5x7 film, I always run 10 sheets through it. How? Tape the long edges of two 5x7 sheets together (on the base side, of course!) and put them into a single tank tube as if they were a single 7x10 sheet of film. I use ordinary cellophane tape.

The only problem with this is that the antihalation dyes under the tape do not wash away during the development stage, so you have to wash the negatives unjoined, outside the tank, for 30-45 minutes until the dyes wash off. But that seems like a small price to pay, to be able to double the tank capacity for 5x7 negatives.

Sanders McNew

Jobo rotary drum for multiple 10x8 sheets of film??

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