Re: G7 press calibration, best press conditions or average?
Re: G7 press calibration, best press conditions or average?
- Subject: Re: G7 press calibration, best press conditions or average?
- From: Bruce Bayne <email@hidden>
- Date: Mon, 03 Nov 2008 06:01:18 -0800
- Organization: Alder Technology, Inc.
Mike,
Very interesting point! Still, how do you know when you are at that
'average' state, and how do you get back to that state? I will go back
to what others have said in this thread, that the basis for process
control is to have a known, repeatable baseline from which to measure from.
If one is measuring, monitoring and adjusting a press to a known target,
the likelihood of it remaining close to that target is much higher than
just running the press to SID over an extended period of time. I have
almost 1,000 readings from different presses and proofers in my copy of
SpotOn! and when you analyze all the data in the database, it comes
surprisingly close to what we're shooting for.
Therefore my stand, based on experience, is that having a target to
shoot at, and performing SPC on a variable device will keep that device
performing very close to the target, until the device mechanically or
chemically drifts to a point, where it becomes obvious (due to the
continuous monitoring and tweaking) that it can no longer hit the
target. That being said, I will continue to set up presses to their
optimum conditions prior to performing a G7 calibration run.
My 2 cents.
--
Bruce Bayne
SpotOn! Press, LLC
P: 503-226-7598
F: 503-226-7892
C: 503-709-9413
I don't think the answer is quite as cut and dry. It actually might
depend on how long the press stays in each state (ideal, average, or
declining). If your press operates the longest in the average state,
than a calibration performed in the ideal state might not give you the
optimum results for the longest period of time. If you buy a new pair
of shoes, there's often a break in period until optimum comfort is
achieved, which is usually longer lasting than the break in period.
True, I can always return to that ideal state by purchasing another
new pair, but stability should play a role in the decision here.
Alright, the shoe thing is kind of a crappy analogy, but the point is
that the optimum time to generate Rip compensation could be when the
state of the press is the most stable, and that may not necessarily be
immediately after maintenance. Of course there's the possibility that
its all decline after the ideal with no break in period...trending
might give you more insight here.
Mike
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