Error 133, “Format Fault,” occurs at the cutter-compensation command in the supplied Delta 20 program. The evidence identifies two post-processor conflicts: the control accepts only one G code per block, and cutter and length offsets are tied to the tool number rather than selected with D or H words. The G41 block containing D1 is therefore the first block to correct.
Identify the format conflicts
| Program element | Finding | Required correction |
|---|---|---|
| N45G41X-0.18Y1.2269D1$ | Error 133 occurs here; D-number output is unsupported according to the available Delta 20 guidance. | Remove D1. Use the offset associated with the active tool. |
| N15G00G40... | Contains two G codes in one block. | Place G00 and G40 in separate blocks. |
| N65G01G40... and N135G01G40... | Each contains two G codes in one block. | Separate the motion command from G40. |
| G43 H-number output | Length-offset selection is also tied to the tool number. | Do not configure the post to emit G43 H-number commands. |
Configure the post processor
Configure the Delta 20 post for one G code per block. Emit the Z feed move with G01, then emit G41 or G42 on the compensation-entry move. Remove D-number output from G41 and G42 blocks, and prevent combined blocks such as G01 G40.
Do not treat G17 as the demonstrated solution to this fault. Although the available manual guidance associates cutter compensation with the selected plane, adding G17 did not resolve this program's Error 133. Keep plane selection correct for the intended toolpath, but correct the block format and D1 output first.
Correct and repost the toolpath
- Remove D1 from the faulting G41 block and suppress all D-number output in the post.
- Split every block containing multiple G codes, including the G00/G40 entry block and both G01/G40 exit blocks.
- Generate a linear G01 lead-in before G41 or G42 so the control has an entry direction. The field-reported requirement is a lead-in at least one cutter diameter long; verify that requirement against the applicable control documentation and toolpath geometry.
- Repost and transfer the program. If control-side compensation remains unsuitable, disable part-surface programming in the CAM system so compensation is calculated into the posted coordinates and G40, G41, and G42 are omitted.
The CAM-calculated workaround removes control-side diameter adjustment. Any cutter-diameter correction then requires changing the CAM setup and reposting the program.
Verify transfer and execution
Confirm that the transferred program retains only one G code per block and contains no D-number or H-number offset selection. End-of-block handling is mode-dependent in the evidence: the control may add $ while displaying an EIA/ISO program, while conversational-format input was reported to require $. Because the reports differ by entry and transfer method, validate the required terminator with a short non-cutting transfer before changing the entire post.
Run the corrected path using the machine's normal safe verification process. Confirm that Error 133 no longer appears at compensation entry, that G41 or G42 engages on the intended linear lead-in, and that G40 cancels in its own block before rapid repositioning.
FAQ
Why does Delta 20 show Error 133 on a G41 block?
In the supplied program, the faulting G41 block contains D1. Remove D1 because the available Delta 20 guidance states that the radial offset is tied to the tool number rather than selected with a D word.
Can a Delta 20 program contain two G codes on one line?
The available EIA/ISO guidance permits only one G code per block. Split G00 G40 and G01 G40 combinations into separate blocks.
How can I machine without G40, G41, and G42 on a Delta 20?
Disable part-surface programming in the CAM system and post coordinates with cutter compensation already calculated. This avoids the compensation codes but requires a CAM change and repost to fine-tune cutter diameter.
