Vandercook 320G issues

I’m in the thick of trying to get my Vandercook 320G up and running. This is different than other Vandercooks I’ve printed on for various reasons (it’s completely manual, the metal and rubber rollers are behind the cylinder, etc). I’ve encountered a couple of things so far that I’d love advice with if you have any expertise to offer:

-On other presses, it seems as though you can use a screwdriver to raise/lower the rubber rollers to the right height (right to raise, left to lower). Is this different on this press?

-Along with that, I can’t seem to get the rollers raised (at all/enough) so that they aren’t contacting the metal sheet behind them (under the feed board) each time I make a revolution. Any thoughts?

-This press doesn’t seem as though it’s been operable for many years. What’s the best way to be able to tell if the rubber rollers need to be replaced/recovered, or is it just inevitable that they will need to be?

-I’ve only got a five or six sheets of tympan on the cylinder, but it doesn’t seem near enough to make contact with the polymer plate for a good impression. What’s the best kind of (non-brand name) paper to use for packing? What’s the max number of sheets you can use as hard/soft packing?

I know I’m asking a lot here. If you have any helpful advice, I’d be much obliged!

cory

Vandercook 320G issues

7 thoughts on “Vandercook 320G issues

  • July 12, 2011 at 12:13 am
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    Yes, ink onto the plate; brayering it can speed distribution considerably. I also feed the plate by brayering from a separate slab where the ink is worked (loosened with an ink knife).
    It is tougher in cold weather, since this arrangement doesn’t provide the friction and heat that powered ink drums do. Sometimes I have turned a propane torch to the plate to pre-heat it before laying on the ink. The metal should be towards 70 degrees to work the ink; at 60 degrees or lower the ink just sits and won’t distribute, even when worked on the slab.

  • July 11, 2011 at 10:30 am
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    Thanks so much for all of this helpful advice. I’ll go home and check on the cylinder measurement this afternoon. I also know that the press did come with a bed liner (two actually). They are both pretty rusted, but I’ll look at getting those cleaned and in place so that the plate on a boxcar base is high enough to make contact with the rollers when they’re in position.

    Glad to know that the metal plate is the inking slab! So, do I put the ink there for distribution or directly onto the metal rollers?

    Also, I’ll those rubber rollers off and sent to be recovered. Thanks so much again for the help!

    cory

  • July 10, 2011 at 2:58 pm
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    It is inevitable that rollers need to be replaced. Over time the diameter shrinks and the rubber hardens. Be sure to remove the gears and send only the cores to be recovered.

    The cylinder is probably undercut .070″ Confirm this by looking for the number stamped into the channel between the cylinder bearer and the impression surface when the carriage is at the feed board. See photo below.

    One sheet of tympan is only .006″. The total amount for impression includes the drawsheet (top sheet) and the paper to be printed. For a kiss impression you need an addition .003″, so .073″. For a deeper impression for example on 110 lb. Lettra (.021″) the total could be 080″.

    As Daniel mentioned a bed plate (.050″) needs to be placed under your polymer base to bring the printing surface high enough to be inked by the rollers.

  • July 10, 2011 at 12:13 pm
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    Oh, I didn’t realize that was an ink slab! So is that where I want to spread the ink initially?

    Is it the same way to raise/lower the rollers? Right to raise, left to lower? I do have a roller gauge, but I was so alarmed that it was inking that back plate, that I got scared I was doing it all wrong!

    I believe everything is in place, but I can take a picture and upload to clear it up. Thanks so much for your help!

  • July 10, 2011 at 12:06 pm
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    That metal sheet is your inking slab! You want it to make contact there. Imagine that slab as a flattened out ink drum.

    You can set your rollers with a flat head screwdriver and a roller setting gauge. Is the bed plate in place on the bed of the press?

    Daniel Morris
    The Arm Letterpress
    Brooklyn, NY

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