APM
All alarm codes
ALARM 293

Optional Sensor 4 (Tailstock not Homed)

Tailstock quill was not homed after E-stop was pressed — the control no longer knows where the tailstock is. On QT machines without a tailstock installed, th...

Controls
T-2, T-32
Machine series
Quick Turn

Causes

  1. Tailstock quill was not homed after E-stop was pressed — the control no longer knows where the tailstock is. On QT machines without a tailstock installed, the alarm fires when the tailstock limit switch position is wrong.

    • Philabusterforum
      Alarm 293 pops up most commonly because you are pushing the E-stop button for some reason.
    • gelosforum
      In my machine tailstock is removed. Limit switch in tailstock box was moved. After set the limit switch problem is solved.

How to clear it

  1. 1

    Extend the tailstock quill fully, then retract it. The control will re-acquire the home position and the alarm will clear.

    • Philabusterforum
      Solution: Extend tailstock quill and then retract it. Should work.
  2. 2

    If the tailstock has been removed from the machine, the issue is at the tailstock-box limit switch — verify the switch is in the position the control expects.

    • gelosforum
      In my machine tailstock is removed. Limit switch in tailstock box was moved. After set the limit switch problem is solved.

Confidence: high · Two independent sources (PM and CNCZone) with the same fix, plus a second confirmation on CNCZone from the OP that the limit-switch variant solved his case. Philabuster (Diamond member) gave the same answer in both forums.

First sourced: 5/21/2026

Related alarms

Same control or a nearby code on the same machine.