Method for controlling a coordinate measuring apparatus
AssigneeCarl-Zeiss-Stiftung
InventorUlrich Staaden
Life of this patent
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Abstract
The invention is directed to a method wherein the probe head of a coordinate measuring apparatus is driven in a controlled manner in accordance with desired data. The control data, which are necessary for the control, are prepared in the computer of the coordinate measuring apparatus as a point sequence (S1 to Sm) from the geometric data (G1 to Gn) as, for example CAD data. These CAD data describe the work profile to be scanned. For this purpose, the computer encodes the speed profile which ensures a jolt-free movement and a measurement time as short as possible by appropriately selecting the spacings between the points (S1 to Sm) of the control data.
Claims16
A method for controlling a coordinate measuring apparatus for measuring a workpiece surface defined by geometric data (G1 to Gn), the apparatus including a probe head which is driven in a controlled manner in accordance with desired data, the method comprising the steps of:
- (a) processing said geometric data (G1 to Gn) of said workpiece surface by generating control data (S1 to Sm) therefrom in the form of a sequence of points, the spacing between each two mutually adjacent ones of said points defining the desired course of the speed (v(t)) and the desired course of the acceleration (a(t)) and the spacing between each two mutually adjacent ones of said points always being less than a pregiven first value (vmax) and the first derivative of the point spacing at each position being less than a pregiven second value (amax) wherein said desired course of the speed (v(t)) defines a speed profile (v(t)) and said desired course of the acceleration (a(t)) defines an acceleration profile (a(t));
- (b) selecting the spacings of the points (S1 to Sm) so that, when advancing at even time intervals from one point to the next, a jolt-free course of movement results without jumps in the speed profile (v(t) and without jumps in the acceleration profile (a(t) of said apparatus;
- and,
- (c) driving said probe head with said control data determined in steps (a) and (b).
A method for controlling a coordinate measuring apparatus for measuring a workpiece surface defined by geometric data (G1 to Gn), the apparatus including a probe head which is driven in a controlled manner in accordance with desired data, the method comprising the steps of:
- (a) processing said geometric data (G1 to Gn) of said workpiece surface by generating control data (S1 to Sm) therefrom in the form of a sequence of points, the spacing between each two mutually adjacent ones of said points defining the desired course of the speed (v(t)) and the desired course of the acceleration (a(t)) and the spacing between each two mutually adjacent ones of said points always being less than a pregiven first value (vmax) and the first derivative of the point spacing at each position being less than a pregiven second value (amax);
- (b) selecting the spacings of the points (S1 to Sm) so that, when advancing at even time intervals from point to point, neither the permissible maximum value of the speed (vmax) of said coordinate measuring apparatus nor the permissible maximum acceleration (amax) thereof is exceeded;
- and,
- (c) driving said probe head with said control data determined in steps (a) and (b).
Dependencies are inferred from the claim text.