Linx 4900 Operating Manual page 186

This typically requires trial and error; first select an encoder/gear
combination, and then multiply it by whole numbers to get the actual pitch.
This is then compared to the required pitch.
Encoder/Gearing
Try 1
Try 2
Try 3
For each encoder pitch that you try, the starting point for the pitch factors
can be:
Pitch Factor (rounded to the nearest whole number) =
Using the example from Step 1, the required raster pitch is 0.373 mm. A
standard Linx encoder and wheel is used to try to achieve this.
Encoder/Gearing
Try 1
2500 p.p.r./200 mm
Try 2
2500 p.p.r./200 mm
Try 3
5000 p.p.r./200 mm
The actual raster pitch from Try 3 is close enough to the required raster
pitch to be used, particularly as the required raster pitch is the maximum,
therefore, a 5000 p.p.r. encoder and a 200 mm wheel is specified, and the
pitch factor is 9.
It can be seen that the higher the encoder pulses per revolution, the closer
the actual pitch approaches the required pitch. This also gives the
possibility of accommodating changes in the required pitch, however, the
cost of the encoder will be higher and there may be limitations in terms of
speed.
MP65492–1
Encoder Pitch
Figure A-12 Selecting Encoder Pitch Combinations
Required Pitch (mm)
Encoder Pitch (mm)
Encoder Pitch
0.080 mm
0.080 mm
0.040 mm
Figure A-13 Example Encoder Pitch Combinations
167
Appendix A: Installation and Setup
x Pitch Factor = Actual Raster
x Pitch Factor =
4
5
9
Linx 4900 Operating Manual
6512
Pitch
&#"!
Actual Raster
Pitch
0.32 mm
oo Low
0.40 mm
oo High
0.36 mm