A shape-and-sand machine holds stock down against the abrasive, and the rollers doing the holding wear against a moving, dusty surface all day. Poly Tube replaces them: urethane tube in a range of diameters and hardnesses, cut to the width your machine takes.
What you choose
- the outside diameter — the roller face that rides on the stock
- the inside diameter — the bore that goes over your shaft, bushing or keyed core
- the width, in quarter inches, up to 12"
- the durometer, which is the hardness of the urethane
Every combination is cut from standard tooling, so a size nobody else stocks is not a custom job and is not priced like one.
Choosing a hardness
A durometer is the hardness of the urethane on the Shore A scale — 40 is soft and rubbery, 95 is nearly rigid. WRC casts each hardness in its own color, so a roller on the machine can be read without a gauge:
| Durometer |
Color |
| 40A |
Clear |
| 50A |
Blue |
| 60A |
Green |
| 70A |
Yellow |
| 85A |
Orange |
| 95A |
Red |
A softer roller conforms to stock that is not perfectly flat and holds it without slipping; a harder one lasts longer and resists the abrasive dust that shortens roller life on these machines. If the machine is running well, match what came off it — the color is the record of what was there.
Longer than 12 inches
Poly Tube is cut to a 12" maximum. Stack two or more pieces on the same shaft for a wider roller; that is how WRC covers spans of several feet.
Before you order
Measure the roller you are taking off rather than working from the machine's spec sheet — shafts and bushings differ between build years and after any repair. If what you need is not offered, call 800-541-2317. WRC pours sizes that are not listed online and can usually match a part from the one in your hand.
