User Manual
40
The sample itself, particularly if pressing a sample within an evacuable
pellet die, may though have been
partially compressed
from any load
condition that had been attained before the piston of the press reached
the limit of its travel. With retraction of the piston face (
7
) to its
start/rest position, a gap will be created between the top of the
evacuable pellet dies own plunger and the top lead screw anvil
pressing surface (
10
), due to the partially, but not fully, compressed
sample within the die. (Typically the gap created could be circa 20mm).
To continue with any pressing process to apply a desired “
Pump up
to
” load to the sample, the lead screw (
8
) should then be adjusted to
close the gap so that the top bolster anvil face (
10
) is 2mm to 3mm
from the top of the evacuable pellet die plunger and the “
Pump up to
”
load (for the program step) is re-applied by pressing of the start button
(
11
) again, to re-run the program.
It is highly probable that a “pre-compression” of the sample from an
initial limit of travel distance movement of the press piston, means that
a full ”
Pump up to
” load to apply and maintain and/or hold can be
achieved within a
second
piston travel limit distance from the load re-
application; hence a two-stage pressing process for such sample
types.
Use of the Stop Button (12)
Given from the
important statement
“If at all possible it is desirable to
avoid running the press piston to the limit of its travel”, it is advisable if
using highly compressible samples
to observe
the pressing process
until the desired load level to apply is achieved.
Full compression of the sample may require a two-stage pressing
operation. Therefore, for the first pressing stage allow the piston to
travel approximately 20mm and then stop the travel of the piston and
the pressing process (program) using the stop button (
12
), particularly
if the “
Pump up to
” load has not been reached after this initial distance
of travel for the piston. When the stop button (
12
) is pressed the
Screen Display (
4
) will change to show a “
Stop key pressed
!”
message
in red text
.
Содержание Atlas Autotouch 40T
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Страница 81: ...Atlas Autotouch 40T Hydraulic Presses 79 13 EC Declaration Of Conformity...
