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Part Deflection Calibration System

IP.com Disclosure Number: IPCOM000079943D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Lankford, LG: AUTHOR

Abstract

Fig. 1, top view, and Fig. 2, end view, of workpiece P show deflection forces on piece P created by tool T during machining in a turning operation. Force F is the cutting force of tool T which can be at an odd angle. Force F shown offset from the center of the piece P is analyzed to include axial force F(a), force F(o) through the center of moment of the part, tending to deflect it, and couple F(c) tending to rotate piece P. Force F(o) equals the x-y components of force F (neglecting z component).

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Part Deflection Calibration System

Fig. 1, top view, and Fig. 2, end view, of workpiece P show deflection forces on piece P created by tool T during machining in a turning operation. Force F is the cutting force of tool T which can be at an odd angle. Force F shown offset from the center of the piece P is analyzed to include axial force F(a), force F(o) through the center of moment of the part, tending to deflect it, and couple F(c) tending to rotate piece P. Force F(o) equals the x-y components of force F (neglecting z component).

A top view Fig. 3 and end view Fig. 4 of a lathe shows a dynamometer D (force to voltage transducer) secured to tool T. Piece P, held by a chuck C on a spindle, is deflected 0.01 in. by tool T as shown in solid lines from the normal (phantom) position p1. Dynamometer D measures along the direction of deflection, the force required to move 0.01 in. from initial bearing of the tool upon the piece P. The difference between deflection forces before and after the motion is the result.

In some cases, it is necessary to adjust the measurement for deflection of the tool and measuring system. This is done as follows: Let F = force of deflection measured, d = deflection measured, KP = force per unit deflection of the part at this point, and KS = force per unit deflection of the tool and measuring system. F over KS is the deflection that can be attributed to the tool and measuring system, d - F over KS is the actual deflection of the part, and KP...