Taking the guesswork out of parting, Part 2

Note: This is the second in a two-part series on proper parting procedures. In Part 2, a look at a better method.

When you’re parting a torque converter, a CNC lathe is the Cadillac of parting devices. With a CNC lathe, you can cut 50 or more converters apart in an hour and virtually eliminate the follow- up machine work – bowl build-ups, installation of renewal rings, and general clean-up – that is necessary with any other conventional method for parting the same converters. One of the factors that allows extra machine work to be eliminated is the small amount of material that is removed when the converter is cut. The bit of the parting tool on a CNC lathe is a .087” wide carbide parting bit held by a boring bar.

This bit only removes a .087” wide band of material and leaves two perfectly parallel surfaces. Working with parallel surfaces makes it easier to reassemble the converter and ensures that the halves run true. The life span of the cutting bit is remarkable, considering its narrow width. Operators are cutting 400 to 500 converters with a single side of an insert. They claim they break more bits setting up programs than they do cutting converters. There are two factors that keep shops from parting their converters on a CNC lathe: fear of the unknown and the start-up cost.

To read the rest of this Technical Article on the Sonnax Website click here.

Article No.: TCTIP-11-05
Author: Ed Lee
Total Pages: 1

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