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Re: Info On Jobo Drums

Peter,

I have been trying to figure out why a rotation sequence that only 
turns the drum 0.6 - 0.7 of a rotation is a problem. There must be 
simple answer that escapes me  but my first thought is that as long 
as each of the individual tubes can empty out/fill up again the total 
amount of solution would be in a constant mix and the agitation 
pattern would be even. What have I missed?

Sandy




>Sandy:
>
>I use the 5-sheet Expert drum for my 10x8's on  a Jobo CPP 
>processor. I tried to use a Unicolor roller base before I got the 
>CPP, and found that the rotation sequence only turned the drum about 
>0.6-0.7 of a rotation. I was in the process of modifying the timing 
>sequence but gave up when I got the CPP. Modification required 
>building a switched relay unit using a 555 timer, transformer, etc, 
>and was proving to be something of a pain.
>
>I also had problems with anti-halation when I used a Jobo print drum 
>to do my 10x8's, but have not had any at all since using the 3005 
>(and I have a two sheet Expert drum for 10x8's as well, which 
>wouldn't work for smaller film sizes, I suspect).
>
>The one thing I didn't realise about the 5-sheet drum initially is 
>that the drum actually has holes in the bottom to allow water from 
>the tempered bath to fill up the space around the film slots to 
>maintain solution temperature. The drum is quite heavy when lifting 
>it to dump chemicals.
>
>Cheers
>
>Peter.
>
>
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