US 2017/0167844 A1Published application

Method of determining a radius of a cutting end of a tool for a turning machine

AssigneePratt & Whitney Canada Corp.

InventorsLAFLECHE GAGNON, RACHID GUIASSA, PHILIPPE ST-JACQUES

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Abstract

A method of determining a radius of a cutting end of a tool for a turning machine using a touch probe is provided. One of the cutting end and the touch probe is movable relative to a reference frame having a first axis and a second axis and having a reference point trackable in the reference frame. The method comprises establishing a first contact point and recording a first coordinate of the reference point on the first axis; establishing a second contact point and recording a second coordinate of the reference point on the second axis; establishing a third contact point and recording a third coordinate of the reference point on the first axis and a fourth coordinate of the reference point on the second axis upon contact; and determining a radius of the cutting end based on the first, second, third and fourth coordinates.

Claims14

Dependent claims

A method of determining a radius of a cutting end of a tool for a turning machine using a touch probe, one of the cutting end and the touch probe being movable relative to a reference frame having a first axis and a second axis, the one of the one of the cutting end and the touch probe having a reference point trackable in the reference frame, the method comprising:

a) establishing a first contact point between the touch probe and the cutting end and recording a first coordinate of the reference point on the first axis, the first contact point having a known coordinate on the first axis;
and
b) establishing a second contact point between the touch probe and the cutting end and recording a second coordinate of the reference point on the second axis, the second contact point having a known coordinate on the second axis;
and
c) establishing a third contact point between the touch probe and the cutting end by moving an end point of the one of the cutting end and the touch probe along a predetermined direction at an angle with the first and second axes and recording a third coordinate of the reference point on the first axis and a fourth coordinate of the reference point on the second axis upon contact, the pre-determined direction being dependent on the coordinate of the first contact point on the first axis and the coordinate of the second contact point on the second axis, the end point being offset from the reference point by an amount deduced from the first coordinate and the second coordinate recorded at steps a) and b);
and
d) determining a radius of the cutting end based on the first, second, third and fourth coordinates.

4 more elements

a) recording a first coordinate of the reference point on the first axis upon contacting the touch probe and the cutting end at a first contact point having a known coordinate on the first axis;
b) calculating a first offset of an end point of the one of the cutting end and the touch probe relative to the reference point on the first axis based on the first coordinate;
c) recording a second coordinate of the reference point on the second axis upon contacting the touch probe and the cutting end at a second contact point having a known coordinate on the second axis;
and
d) calculating a second offset of the end point relative to the reference point on the second axis based on the second coordinate;
e) recording a third coordinate of the reference point on the first axis and a fourth coordinate of the reference point on the second axis upon moving an end point of the one of the cutting end and the touch probe along a predetermined direction and contacting the touch probe and the cutting end at a third contact point along the predetermined direction, the third contact point having known coordinates on the first and second axes, the predetermined direction being at an angle with the first and second axes and being determined from the coordinate of the first contact point on the first axis and the coordinate of the second contact point on the second axis, the end point calculated using the first and second offsets;
and
f) determining a radius of the cutting end based on the first, second, third and fourth coordinates.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/445,293Filed 28 Feb 2017
Priority: 15 Apr 2014
Published: 15 Jun 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G05B 19/401
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
G01B 5/08
Measuring arrangements characterised by the use of mechanical techniques: for measuring diameters
G01B 5/213
For measuring contours or curvatures: for measuring radius of curvature
G05B 19/19
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…

Family

Application14/252,910Continuation · filed 15 Apr 2014
Application15/445,293Continuation
US 10,101,722 B2Related patent
US 2015/0292854 A1Published application
US 9,618,927 B2Related patent
US 2017/0167844 A1This patent

From the US filing history. Foreign family members aren’t listed.