Grinding a Polyurethane Part

Grinding a Polyurethane Part Urethanes 55A to 80A durometer can be ground successfully in an engine lathe using a tool post grinder. Use low turning speeds – below 150 rpm, with the lathe running in reverse. Start with the grinder feed rate set .005 inches per...

Knifing a Polyurethane Part

Knifing a Polyurethane Part Knifing polyurethane parts to close tolerances can be done without too much difficulty. The tool must be absolutely razor sharp and be as thin as possible. When knifing, the urethane will have a tendency to pull into the tool. This...

Parting Urethane Parts

Parting Urethane Parts​ Tools that work well for parting are .060″ to .100″ (1.524 to 2.54 mm) wide with a 20 to 30 degree front rake and no top rake. A small 3/64″ radius is ground into the top of the tool. Starting on the cutting edge, some side clearance is...

Turning & Facing Urethane Parts

In general, use sharp tools, high turning speed, and slow to moderate feeds (depending on hardness). Cutting tools for urethane must have sharp, carefully honed cutting edges. Sharpen tools on a honing stone for a razor sharp edge on the sides, tip, and top of your...

Milling Polyurethane Parts

Milling Polyurethane Parts Urethane ranging from 90A to 70D durometer can be successfully milled without much difficulty. Attempting to mill parts below 80A is not recommended. Tools must be sharp and the work must be fixtured securely. Two-fluted end mills and single...

Contouring Polyurethane Parts

Contouring Polyurethane Parts Machining tapers, chamfers, grooves, and other surface configurations into wheels, rollers, and other round parts all fall into the general category of contouring. The tool works best when positioned .025 to .075 inches (.6 to 2 mm) below...

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