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Archive for September 24th, 2019

CNC 3018-Pro: CD Fixture Probe Camera Target

Taping the CD fixture to the CNC 3018-Pro’s raised platform solves the repeatability problem by putting the CD at a fixed location relative to the machine’s Home coordinates. The next step puts the XY=0 coordinate origin at the exact center of the platter, so the pattern comes out exactly centered on the disc:

CNC 3018-Pro - CD fixture
CNC 3018-Pro – CD fixture

The fixture has a central boss:

Platter Fixtures - CD on 3018 - tape flange
Platter Fixtures – CD on 3018 – tape flange

The blue boss centers the CD’s hub hole, the red plateau supports the disc, and the white background lies 5 mm below the CD’s upper surface:

CNC 3018-Pro - CD holder target
CNC 3018-Pro – CD holder target

Yup, red and blue Sharpies FTW.

The bCNC probe camera image includes two faint cyan rings centered on the crosshair:

CNC 3018-Pro - bCNC probe camera - red-blue CD target
CNC 3018-Pro – bCNC probe camera – red-blue CD target

Set the diameter to 15 mm (or a bit less), center the outer ring on the hub hole = the border between blue & red, set XY=0, and it’s within maybe ±0.1 mm of the true center.

Done!

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