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Section Section 33 Initial SetupInitial Setup
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7. Enter 70% of the value you found in the Max Unramped Feedrate text box
for the X axis, then choose OK.
8. Repeat this process for all axes.
4 To Set the Maximum Feedrates
After finding the maximum unramped feedrates, you’re ready to find the
maximum feedrates achievable with ramping.
1. Choose Feedrate/Ramping from the Setup Menu. The Feedrate/Ramping
Setup dialog box will appear.
2. Enter 10,000 full steps/sec/sec in the Ramping Rate text box for the X
axis. (This is an average ramping rate.)
3. Leave the Max Unramped Feedrates at the values you found earlier.
Leave the Maximum Feedrates at the very high number (100 in/min) and
choose OK.
4. Choose the Point button on the Control Box. Select Any Point from the
Name pull-down menu and Incremental from the Coord pull-down menu.
Enter 1.0 in the X text box and enter a feedrate that is about 50% higher
than the Max Unramped Feedrate for the X axis. Make sure you have
room to move the X axis 1 inch, then choose Start.
5. If the motor slips, repeat this process with a slower feedrate. If the motor
doesn’t slip, try a faster feedrate. Note that slight slippage can be detected
by reading the values on the table feed hand-wheel.
6. Repeat this process you find the highest feedrate that doesn’t cause motor
slippage.
7. Now run the entire length of each the X in both directions to make sure
there is no slippage at any point on the entire axis.
8. Choose Feedrate/Ramping from the Setup Menu.
9. Enter 70% of the highest no-slip feedrate you found in the X axis
Maximum Feedrate text box.
10. Repeat this process for all axes.
4 To Set the Ramping Rate
Ramping Rates typically range from 1000 to 100000 full steps/sec/sec.
Slower ramping rates require more time to ramp up to the maximum feedrate
and to ramp down to a stop. This may become a potentially dangerous
situation when using the Feed Hold button or jogging since the machine will
take longer to come to a complete stop. The goal is to choose a fast ramping
rate that will start and stop the tool responsively without losing steps. Fast
ramping rates can also allow acceleration past resonant speeds of the stepper
motor.