Mahr Digimar 817 CLM Operating Instructions Manual - page 122
122
Mahr GmbH • Digimar 817 CLM
8.5.2
Display the process control chart
Process control charts are computed on the basis of
measured values and saved with a measuring program
with the chosen selection criteria.
Additionally, there is still the choice of a mean-value
process control chart (range control chart) or the
sigma control chart. Which of these charts can be
appropriately displayed, please refer to 8.3 „Control
chart settings“.
The control limits and the mean on mean value chart
can be the shown in a graph.
The lower control limit is also the basis line for the
range control chart or sigma control chart.
If the process control chart is based on less than 5
workpieces or samples, the chart only occupies the
right-hand part of the display. If it is based on more
than 40 workpieces or samples, only the last 40 are
taken into account.
If the sample size was set to 1, each computed point
corresponds to a workpiece. For sample sizes >1, each
computed point corresponds to a sample.
1. <-_______
2. Enter production data text
3. x-bar S/R charts configuration
4. Menu Histogram
5. Menu x-bar S-charts
6. Pareto chart menu
The height measuring instrument offers a quality control
chart in form of a process control chart (mean value), a
range chart as well as a sigma chart with upper and
lower control limits.
Display SPC charts
PRG1
09:57
05/Sep/06
40 1
40/5000 read.
1/50 blocks
1/40 files
1. <-_______
2. Display SPC charts
3. Print SPC charts
4. Selection criteria
on the quality control chart; these are due to such
factors as variations in temperature or material
composition. Systematic influences lead to a slower
shift in the inspection data on the quality control chart,
such influential factors are tool wear or inaccurately
adjusted machines. Systematic influences are usually
foreseeable by using further inspection data.