Polyurethane Design Glossary

A B C D E F G H I J K L M M N O P Q R S T U W Y Z A Abraded Worn away by friction. Abrasion  Wear due to friction. Abrasion Resistance Index (ARI)  A measure of abrasion resistance of a urethane elastomer relative to a standard urethane elastomer under the identical...

Drilling Polyurethane Parts

When drilling polyurethane parts, slow spiral drills perform best because the large flute area permits free discharge of chips with a minimum of binding and heat build-up. Frequent retraction of the drill aids in eliminating chip blockage of the flutes. Why Choose...

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 revolution. Use a slower feed to...

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 displacement of the material will...

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 helpful. Three to five degrees...

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...