The scale factors are numbers that represent the smallest increment that can
be distinguished per unit length. They're used to inform the software of how
much linear distance corresponds to the distance between encoder markers.
Scale factors are printed on the front leg of all new routers.
### Scale Factor Setup
Scale factors can be changed by going to Setup > System, and changing the
M1 through M4 scales. A negative sign indicates direction.
Scale
Factor Interface Setup (pdf)
- Click on Setup > System
- Find the "Mx Scale" section.
- Change the Scale Factor(s) to the correct value(s) for the machine. See
the Scale Factor label on the gantry or front leg for details. Otherwise, see
below for a guess.
- Click "OK" to save change
If the scale factors are unavailable, try the following values, depending on
your machine:
### LC
### LC 3024
- M1: 20320
- M2: -20320
- M3: -20320
### LC plus
- M1: -12192
- M2: -7620
- M3: -20320
### RG
- M1: -10160 (most) or -12192 (59"x50")
- M2: -7620 (newer) or -5080 (older)
- M3: -20320
### Premium Class
- M1: 10160
- M2: 5080
- M3: -20320
If none of these values work, please check your measurement device. Try
measuring over a larger, or shorter area for verification.
### Manual Scale
Factor Generation
If you are still having problems, perform the following operation:
- Using calipers, measure exactly how far the machine moves when you use
jog step to move the machine 1 inch.
- Take the current scale factor value, and divide it by the result you just
got. (i.e. 20320 / .9")
The resulting number is the correct scale factor. Repeat this test until you
achieve the desired accuracy. The number will likely be a round number.
###
Mathematical Scale Factor Generation
On some machines, unusual pulleys have been used. This results in scale
factors unlike the typical ones listed above. To obtain an exact scale factor
for these, some simple math is necessary.
- Count the number of teeth on the motor pulley and ball screw pulley
- The number of pulses per revolution on a standard motor is 4000.
- The typical screw pitches are 5,10 and 20 mm. Spin the screw once while
measuring the distance traveled and ascertain which pitch screw you have.
Using these numbers, you can calculate what the appropriate scale factor is.
Scale Factor for 1 inch = ((1/(screw pitch /25.4))*4000)*(ball screw pulley
teeth /motor pulley teeth) Scale Factor for 1 millimeter = ((1/(screw
pitch))*4000)*(ball screw pulley teeth /motor pulley teeth)
So a scale factor for 1" units:
- On a 20mm screw
- With 4000 pulses per rev of the motor
- 20 teeth on the pulley
- 22 teeth on the ball screw
Will be:
((1/(20/25.4))*4000) * (22/20) = 5588 |