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By Graham T. Smith (auth.)

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This technique allows the programmer to specify gear tooth forms based upon an involute form, to be quickly and accurately defined using just a few data inputs. General note: When considering the variety of interpolation techniques available then the following observations based on the part geometry to be machined can be made. If the profile is: a straight line - use linear interpolation a circle - use circular interpolation a helix - use helical interpolation if none of these, use linear interpolation - to approximate the curve, but never allow the cutter path to deviate more than the component's tolerance.

By supplying a swarf conveyor on a turning centre, the swarf can be deposited in a container well away from the cutting region. There are several varieties of design of swarf conveyors, ranging from the most common chain-type to the rotating spiral Fig. 15. A partially programmable tailstock supporting a long workpiece in the "latch-up" position. It can be "latched-down" (lowered) when not required. ] The Development and Design of CNC Machine Tools 19 a b Fig. 16. Turret configurations. a 2-axis, driven/conventional tooling.

When the slide is moved, a binary signal is produced and can be analysed, allowing the exact position of an axis to be established. A problem arises with this technique in that the photo-diodes cannot be exactly positioned so that all tracks are "switched" at the same time, leading to the likelihood of faults in the reader system. The problem is overcome by using a "greycode" switch track and a V-form reader. The photo-diodes are arranged in the V-form with the finest track using a single photo-cell, whilst other tracks have two photo-cells positioned such that they are in the middle of the respective distance quanta producing the so-called V-form.

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