7: TROUBLESHOOTING
©Tormach® 2021
Specifications subject to change without notice.
Page 70 UM10753: 8L Operator's Manual (Version 0321B)
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Cause: A limit switch flag is improperly adjusted.
Probability How-To Steps Need More?
Low If the machine crashes into the hard stop during the referencing procedure:
1. Jog the machine to its reference position.
2. From the PathPilot interface, on the Settings tab, clear the Limit Switches
checkbox. Then, on the dialog box, select OK.
3. Push in the Emergency Stop button on the operator box.
4. Adjust the limit switch flag so that the limit switch's red LED is off.
5. Jog the machine off of the limit switch.
6. From the PathPilot interface, on the Settings tab, select the Limit Switches
checkbox to re-enable the limit switches.
For information, see "The machine is stuck on a limit switch." earlier in
this section.
If the limit switch flags are improperly
adjusted, the limit switch won't trigger
when the machine is referenced.
Instead, the axis will crash into the
hard stop.
Cause: The control board is defective.
Probability How-To Steps Need More?
Low
Go to Limit Switch Function Reference.
A defective control board will report no
change in the state of the limit switch,
even though the switch and wiring are
functioning properly.
7.14.5 Lost Motion on Axis Travel
The machine uses stepper motors — open-loop control motors that are accurate and reliable — to control axis motion. With stepper
motors, however, there's a chance of losing steps in axis motion. This is because lost steps occur when the commanded number of steps
and the actual number of steps don't match (a risk with open-loop control). A step mismatch results in a loss of motion on the axis.
In most cases, when a machine loses steps, it loses many steps all at once — resulting in a visible stutter or a stall in axis motion, and/or
an audible noise. Lost steps often occur when a stepper motor is pushed too hard or too fast, and it exceeds its limits.
Although this machine uses stepper motors to control axis motion, the entire system is designed to reduce the likelihood of losing steps. In
most cases, the machine breaks smaller cutting tools or stalls the spindle with bigger cutting tools before losing steps. Outside variables,
like programming, tooling, workholding, and operator error, are sometimes misinterpreted as lost steps.
Cause: Improper use of tool offset, work offset, or cutter compensation.
Probability How-To Steps Need More?
High
Examine the G-code programs. You must fully understand tool offsets,
work offsets, and cutter compensation.
The most common cause of a
perceived loss of position or lost steps
is operator error.
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