Re: [PPLetterpress] Re: Rollers up or down?
- Thanks for the notes Fritz, I'm going to contact you off-list regarding the rollers...
----- Original Message -----
Sent: Friday, June 20, 2008 11:39 AM
Subject: [PPLetterpress] Re: Rollers up or down?
In terms or roller measurement, there is considerable difference
between .03 to .05 on the minus side of 2.500. Measure to the
thousandth and if a roller is actually at 2.450, it is undersize and
out of specification and thus can cause ink adjustment problems.
Original Vandercook specifications are for rollers to be made
oversize to allow for inevitable shrinkage so that the roller ends up
at the correct 2.500 diameter. In terms of machining and the way
these presses were designed, the difference between .03 to .05 is big
enough to drive a truck through. Take 2 rollers at that big a
measurement and it doubles the dimension problem. The solution may in
part require new rollers made to spec.
> Hi Eric,
> Last question first: yes, nyliners on the inside (which is why you
don't see them in the photo).
> As for the brackets, if you look closely at the picture,
specifically at the thick-head screws that hold it in place, you'll
see that the bracket is not lowered as far as it should be - that is,
the screw slots in the bracket itself show significant potential
movement below where the screws appear in the photo. This is because
the toe of the L is stopping the bracket from lowering any further
when the rollers are set down. Thus, the first roller (closest to the
carriage) is always held above type high, even when the adjustment
knobs are lowered fully.
> I've measured the rollers with a micrometer and each is within .03-
.05 of 2.5" (that is, measuring from 2.45-2.47"), well within the
range of adjustment it seems to me.
> ----- Original Message -----
> From: parallel_imp
> To: PPLetterpress@yahoogroups.com
> Sent: Friday, June 20, 2008 9:33 AM
> Subject: [PPLetterpress] Re: Rollers up or down?
> --- In PPLetterpress@yahoogroups.com, <jason@> wrote:
> <<What I'm thinking is to hold the brackets in a vise and slightly
> correct the right-angle, so that the foot of the L is more
> perpendicular, thereby allowing more up-and-down play in the
> adjustment of the inner roller.>>
> Jason, yeah, that bracket is not correct. It should be a right-
> the support arm parallel to the bed. However, correcting that
> solve the problem of the inner roller because that roller does
> support at the correct position. It is the outer roller that is
> supported below the correct position. If the inner roller can't be
> lowered to .918" its diameter may be too small. I don't recall the
> correct diameter, might be 2.5", but at any rate it won't be in
> eighths or sixteenths of an inch.
> Does the end of the inner roller near the operator side adjust
> lower than the gear end? At a certain point an undersize roller
> be stopped by the roller gear bottoming out in the bed gear rack.
> Also, I don't see nyliners on the roller core (though you can see
> one at the pivot point for the arm holding the rider rollers). Are
> they present on the inner side of the block? If you need nyliners
> don't have them, the rollers will have some play in the bearer
> --Eric Holub, SF
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