Reading Probe Results

Read the Q-parameters a probe fills in and average opposite edges into a centre.

A touch probe leaves what it measured in Q-parameters the control fills in for you. Reading those into your own boxes — then averaging opposite edges — is how a macro finds the middle of a feature it just probed.

Read firstHeidenhain TNC 640: Touch-Probe CyclesTNC 640 probing reference: manual probing functions, TS calibration cycles 460-463, workpiece cycles 400-431 and the 14xx generation, TT tool-measurement cycles 480-485, result Q-parameters, and common gotchas.→

Your turn

The probe captured four edge touches: the two X edges in Q115 and Q116, the two Y edges in Q117 and Q118. Compute the feature centre — Q1 = centre X, Q2 = centre Y — and its X span into Q3.

The machine gives you

boss around (40, 25):Q115 = -10Q116 = 90Q117 = 5Q118 = 45
a different feature:Q115 = 0Q116 = 50Q117 = 0Q118 = 30

Your program is run once for each set of conditions. It has to work for all of them.

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This is a learning simulation — always prove out a program on the actual control before you cut metal.

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