CNC Squareness Adjustment Calculator

01 / Measurements

Enter expected spans and actual measurements

Expected X test span

Expected Y test span

ULURLLLR

A · LL → URB · LR → UL

Actual diagonal A · LL to UR

Actual diagonal B · LR to UL

Actual Y-drive/reference spacingUse the actual mechanical spacing, which may differ from the expected X test span.

02 / Adjustment

Actual correction · move one side by

0.135in

Actual axis error 0.172° · actual included angle 89.828°

Expected diagonal

Actual diagonal average

Actual diagonal difference

Actual vs. expected

Actual split correction

Move each side in opposite directions.

03 / Test programs

Squareness G-code files

These programs reproduce the expected 45 × 108-inch test. Use the air test first, make the corner dimples and actual measurements, then run the repeatability test.

Program settings

Values follow the selected unit; downloads use metric G-code (G21).

Actual safe Z from spoilboard

Actual dimple depth

Actual air-test feed

in/min

Actual plunge feed

in/min

Actual left-edge offset from spoilboard left-edge

Actual front-edge offset from spoilboard front-edge

Before runningReview the generated G-code for your controller and confirm work zero, tool, safe Z and clearances.

Step 1Generated

00_AIR_TEST.mmg

Locate the test positions and place the aluminum tape without touching the surface.

Download ↓

Step 2Generated

01_CORNER_DIMPLES.mmg

Create the four dimples used for the two diagonal measurements.

Download ↓

Step 3Generated

02_REPEAT_DIMPLES.mmg

Revisit each dimple clockwise and counter-clockwise to check repeatability.

Download ↓