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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Wed Jun 02, 2010 1:05 am Post subject: DIY Jobo Expert Drum |
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Farside wrote:
Some of you might know about the Jobo Expert Drum, which takes 5 sheets of 4x5 or 9x12 film in tubes, arranged like a revolver cylinder.
I've commenced construction of a simple imitator of that, consisting of 6 tubes inside an empty Jobo cylinder for prints. I have a longer one too, which will hold 18 films.
Photos to follow... watch this space _________________ Dave - Moderator
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Last edited by Farside on Wed Jun 02, 2010 11:20 pm; edited 1 time in total |
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rawhead
Joined: 09 Feb 2009 Posts: 1525 Location: Boston, MA
Expire: 2014-04-29
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Posted: Wed Jun 02, 2010 1:36 am Post subject: |
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rawhead wrote:
Very curious... especially if it can save me hundreds of dollars
What about size? Would it be usable on the lesser Jobos, like my CPE2? _________________ Sony α7R, Pentax 67II, Kiev-60, Hasselblad 203FE, 903SWC, Graflex Norita 66, Mamiya M645 1000s, Burke & James 8x10, Graflex Pacemaker Speed Graphic (4x5 and 3x4), Century Graphic (2x3), R.B. Graflex Seried D, Rolleiflex SL66E, Rolleiflex 2.8C Xenotar, Mamiya C330f, a few M42, six P6, three OM, four Hasselblad, two Pentax 67, two Mamiya 645, one Noritar, and a sprinkle of EF. Oh, and an Aero Ektar and Leica Noctilux |
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Wed Jun 02, 2010 11:17 pm Post subject: |
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Farside wrote:
OK, here is the Non-Expert Drum
I'm fitting this to a CPP, first generation machine.
First, take an ancient Jobodrum 4531, designed to develop prints and usually to be found on ebay for a fiver or so. These drums went with the first generation of Jobo desktop machines with the magnet drive in the base of the drums. As far as I know they also fit the later machines.
First of all, a rough fitting exercise
Cut six lengths of uPVC 38mm OD waste pipe to just 2mm longer than a sheet of 4x5 lengthways, then glue them together around a shorter central tube.
Cut some 3" (75mm) lengths of uPVC reinforcing strip (this was capping from electrical conduit) and glue across every side opening.
There is an internal boss at the base of the cylinder which houses the magnet drive. To clear this, the ends of the tubes must be softened with a hot air gun and deformed with pliers, else the lid will not seal.
It needs properly cleaned up, but this is the nearly finished article.
I only have to see if it works, and even if it doesn't I realised it would be easy to glue some longer sections of those capping strips lengthways to the inside of the drum and just slide some sheet film into them. It's cheap enough to buy another drum and have one for 4x5 and one for 9x12. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Tue Jun 29, 2010 12:09 am Post subject: |
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Farside wrote:
And it actually works!
Shanghai 4x5 processed in D76+3 for 15mins on Jobo CPA.
This is just a suck-it-and-see exercise - a starting point, so the neg isn't as good as I would like, but it's an image of some sort.
_________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
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Orio
Joined: 24 Feb 2007 Posts: 29545 Location: West Emilia
Expire: 2012-12-04
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Posted: Tue Jun 29, 2010 12:15 am Post subject: |
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Orio wrote:
very interesting, thanks! _________________ Orio, Administrator
T*
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Tue Jun 29, 2010 8:02 pm Post subject: |
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Farside wrote:
It's not perfect, yet. There's a tendency for the film to stick to the back of the tubes and the anti-halation backing doesn't all remove, even with a pre-soak. I shall lightly saw shallow slots or drill a series of small holes in the position, to allow water into the back.
The remaining AH backing was just narrow streaks and easily removed whilst the film was still wet, but best to avoid too much handling, as I did scratch the negs doing it. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
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philslizzy
Joined: 07 Aug 2012 Posts: 4745 Location: Cheshire, England
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Posted: Mon Aug 26, 2013 10:23 am Post subject: |
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philslizzy wrote:
perhaps a few strips of 1.5mm plastic rod glued into the tubes may work. The only contact then will be with the upper surface of the rods.
I've mocked up a photoshop version to illustrate my point. The rods perhaps need to be thinner but you get the idea. I'm sure I have seen a print tube with moulded ridges, this is just copying the idea. This also makes removing the film so much easier.
_________________ Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Mon Aug 26, 2013 8:01 pm Post subject: |
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Farside wrote:
I'll try something like that - it's been too long since I last looked at it. The Jobo print drums have the ridges but more suited to print sizes. I thought of simply slotting film sheets in them before I did all this, but then realised there wasn't much stopping the sheets from sliding onto each other during processing. I need to look afresh at it to make sure that the introduction of ridges in the diy pipes won't reduce the internal circumference. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
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philslizzy
Joined: 07 Aug 2012 Posts: 4745 Location: Cheshire, England
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Posted: Mon Aug 26, 2013 11:03 pm Post subject: |
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philslizzy wrote:
I think I may drill holes in the sides too just to get a flow going. I'm assuming the whole tank is filled not just the tubes. _________________ Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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David
Joined: 13 Apr 2011 Posts: 1869 Location: Denver, Colorado
Expire: 2013-01-25
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Posted: Tue Aug 27, 2013 2:18 pm Post subject: |
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David wrote:
Dave, you could try heavily scarifying the tubes' insides with 60 grit or rougher abrasive paper. I do that with my home-made film tank and process-destroyed antihalation layers are removed. Another option might be to glue some pegs to the top and bottom so that the film tacos in a way that prevents it from suctioning to the tubes. The Jobo 3010 inerst has vertical ridges inside the tube so that the film has a different arc than the tube, allowing fluid behind the back. _________________ http://www.youtube.com/user/hancockDavidM |
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Lloydy
Joined: 02 Sep 2009 Posts: 7795 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Tue Aug 27, 2013 2:35 pm Post subject: |
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Lloydy wrote:
How about flexible, corrugated and perforated land drain tubing?
http://www.plasticdrainage.co.uk/underground_drainage/Land_Drainage
It's 60mm dia' and bigger, and it comes in rolls which is expensive. But I bet the DIY sheds like B&Q will have shorter rolls for domestic use.
And if you use the conduit capping or something similar to hold it all together the flex of the short lengths won't matter. _________________ LENSES & CAMERAS FOR SALE.....
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Tue Aug 27, 2013 11:12 pm Post subject: |
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Farside wrote:
philslizzy wrote: |
I think I may drill holes in the sides too just to get a flow going. I'm assuming the whole tank is filled not just the tubes. |
I dug it out and I'd already drilled holes, but not touched it or tried it since.
Iirc, in order to lighten the load on the motor, the drum was only holding 400ml or so, perhaps less. Just enough to comfortably do the job and I suspect that I could get away with much less if the distribution is attended to.
The date on the original thread puts it just before a major health incident of my partner's and this stuff got forgotten about. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Tue Aug 27, 2013 11:54 pm Post subject: |
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Attila wrote:
I have this drum too, thank you Dave! _________________ -------------------------------
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