The supplied program positions at X-41 Y25, calls CYCLE85 with a programmed depth of -35, then issues a second X-41 Y25 position. Whether that produces the intended bore depends on the control’s cycle definition, active work offset, tool data, and machine configuration; verify those before running the block on a machine.
Does the control recognize this CYCLE85 call?
Read the control’s program syntax or cycle diagnostic for the exact CYCLE85 argument order. The snippet uses a positional call with an empty field, so commas and field positions matter: deleting the empty field or moving an argument can assign values to different cycle inputs.
| Program element | Reading or check | Next decision |
|---|---|---|
CYCLE85(10,0,2,-35,,0,850,0) |
Confirm the supported syntax and the meaning of each argument for this control. | If syntax or argument order differs, rewrite the call from the control documentation before execution. |
Empty argument between -35 and 0
|
Confirm whether the blank is permitted and what default or omitted value it invokes. | If the control rejects it or applies an unintended default, enter the intended value explicitly. |
MCALL before and after the cycle call |
Check whether the modal cycle is active at the hole position and canceled afterward. | If activation/cancellation behavior differs, adjust the call sequence to the control’s syntax. |
A positional cycle call is not self-documenting: the numbers alone do not prove which plane, depth, clearance, dwell, or feed each field controls. Do not infer that mapping from the values or from another control family. Confirm it on the target control.
Does the physical setup match the programmed path?
Before investigating cycle parameters, check the physical and coordinate inputs that determine where the tool can travel. The sequence selects tool T9, calls M6, starts clockwise spindle rotation with S6800 M3, enables M8, selects G54, and uses G17. Verify that the installed tool, spindle, coolant, fixture, and work offset correspond to those commands.
- Compare the displayed active work offset with the part datum used to derive X-41 and Y25.
- Check the tool table and tool-length compensation against the actual drill identified in the comment as diameter 5.5.
- Confirm the spindle command and coolant command are supported and mapped as intended by the machine builder.
- Check the clearance move
G0 X-41. Y25. Z10.against the fixture, stock, and tool length.
If the offset or tool data is wrong, correct that input and recheck the approach position before cycle testing. A correct cycle call cannot compensate for an incorrect datum or tool setup.
What do the motion and feed commands request?
The program selects G54, continuous-path mode G64, and the XY plane with G17; then it commands a rapid move to X-41 Y25 Z10. It sets F850 before the cycle and also passes 850 as an argument to CYCLE85. Check the control’s active unit system and feed mode before interpreting the numeric feed. The snippet does not identify whether these values represent mm/min, another feed unit, or a particular feed mode.
The repeated XY coordinates at N80 and N110 may be intentional: the first is an explicit approach, and the later coordinate can trigger the modal cycle after MCALL. Confirm this behavior in the control’s block display or simulation. If the later position is not interpreted as a cycle point, the tool may not execute the intended drilling motion.
Which checks isolate a stopped or incorrect drilling cycle?
Use the control’s program test or simulation and observe block-by-block execution. Read the active cycle status at N100, then inspect the motion produced by N110. An alarm at the cycle call points to syntax, argument, or configuration compatibility; an accepted call with an incorrect endpoint points to cycle-field interpretation, active units, or coordinate setup.
| Observed result | Likely check | Next action |
|---|---|---|
Alarm at CYCLE85
|
Cycle availability, call syntax, omitted field, and argument count. | Correct the call according to the target control’s cycle reference, then retest. |
| Cycle accepted but wrong depth or plane motion | Argument mapping, reference datum, sign convention, and active coordinate system. | Compare simulated endpoint with the intended hole depth and work datum. |
| No drilling motion at N110 | Whether MCALL activated a modal cycle and whether the coordinate block is its trigger. |
Check cycle status and the target control’s modal-cycle rules. |
| Unexpected motion after drilling | Cycle cancellation, following H30, and M29M30 interpretation. |
Review each block’s machine-specific meaning and verify the post-cycle path. |
The snippet does not define H30 or the combined M29M30 block. Do not assign them a meaning by appearance; check the target machine’s M-code and address assignments and verify their effect in simulation.
How should the program be corrected and verified?
Resolve discrepancies in this order: machine/control syntax, physical tool and datum setup, cycle parameter mapping, then modal activation and cancellation. Preserve the intended hole location and depth only after confirming them against the part drawing and setup.
- Use the exact target control’s cycle reference to map every CYCLE85 field, including the blank argument.
- Correct the call or coordinate blocks only where the control syntax or intended motion requires it.
- Run program test/simulation and inspect the approach, cycle entry, drilling endpoint, retract, and exit blocks.
- At the machine, use the approved setup procedure and a controlled first run; compare the displayed position and resulting bore with the intended datum and depth before production.
Do not treat the comment’s drill diameter or the programmed numeric values as proof of suitability. Validate tool limits, material conditions, and feed/speed against the tool and process requirements.
Frequently asked questions
What happens if the blank CYCLE85 argument is removed?
The remaining values may shift into different positional fields. Keep the blank only if the target control permits an omitted field; otherwise enter the documented intended value explicitly.
What happens if the control alarms on CYCLE85?
Check cycle support, argument count and order, and the empty field first. Retest only after matching the call to the target control’s syntax.
What happens if the bore ends at the wrong depth?
Verify which cycle argument sets depth, the active work offset, the programmed sign convention, and the displayed endpoint. The value -35 alone does not confirm the control’s depth interpretation.
What happens if N110 only moves to the XY coordinate?
Check whether MCALL activated the cycle and whether a coordinate block triggers it on this control. Inspect cycle status and the simulated motion at N110.
What happens if H30 or M29M30 changes the exit motion?
Read the target machine’s address and M-code assignments; their meanings are not defined in the program excerpt. Verify the blocks’ effects in simulation before running the final verification step: compare the controlled first bore’s location and depth with the intended part datum and drawing.