[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Info On Jobo Drums

If you don't exceed 360 degrees of rotation you don't get full coverage of
the film.

----- Original Message -----
From: "Sandy King" <sanking@hubcap.clemson.edu>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, October 30, 2000 8:27 PM
Subject: 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.
> >
> >
> >**********************************************************************
> >                                 WARNING
> >
> >This email message and any attached files may contain information
> >that is confidential and subject of legal privilege intended only for
> >use by the individual or entity to whom they are addressed.   If you
> >are not the intended recipient or the person responsible for
> >delivering the message to the intended recipient be advised that you
> >have received this message in error and that any use, copying,
> >circulation, forwarding, printing or publication of this message or
> >attached files is strictly forbidden, as is the disclosure of the
> >information contained therein. If you have received this message in
> >error, please notify the sender immediately and delete it from your
> >InBox.
> >
> >AFP Web site: http://www.afp.gov.au
> >**********************************************************************
>
>