On 6/13/02 8:44 AM, "Katie Harper" <knharper@...
> I also did a test by moving the plate across from right to left, inking and
> printing after each move. This was very revealing.
Yes it sounds like issues with the roller tracks.
Roller bearers might help alleviate some of the printing irregularities if
your tracks are worn unevenly.
> Harold Kyle, whose boxcar base I am
> using, says that the base+plate is slightly lower than type high, so I will
> have to find a happy medium on roller height, since one doesn't want to be
> moving them up or down on a whim.
The reason they are lower is so that, no matter where the machining
tolerances leave the overall thickness, you can easily raise the surface to
Case in point:
According to the paperwork, our machinists left less than 0.0003" variation
in thickness across Katie's base. (This minute variation will not produce
inking irregularities). The lowest point, when properly mounted with a
0.0394" (1mm) plate and 0.0040" film adhesive will be 0.9171". This means a
0.001" underlay will bring the base to type high. All one needs is a piece
of glassine or item number 9513K27 (page 3382) at
Then adjust your rollers and packing to 0.918" for all forms.
> The larger display type printed
> beautifully, while the body type was sloppy. In other words, it looked like
> the ink was perfect on the larger type and over inking on the smaller. Does
> larger type need different treatment (ie, makeready or roller height) than
> smaller type? Or does this indicate an uneveness in the plate's
Larger solids need more ink. Titling might need a separate print run from
the text as a result. The sloppiness you describe in the text sounds like
This could also be roller problems flaring up again. Low rollers are a much
more visible problem on smaller text sizes.
Some of the inks you describe may have dryers, which can cause fuzzy type if
you leave them on the press for an extended time.
I hope these thoughts help,
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