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 improve surface finish […]
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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 cause a “dish” on the finished
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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
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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 point fly cutters are preferred. Fly cutters should utilize high-speed tool bits ground
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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 the center of the work-piece. The chips should come off in a continuous ribbon.
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Cutting Polyurethane Parts One of the best machines for cutting urethane parts is a band saw. Long blades of 125 to 175 inches (3,175 to 4,445 mm) are desirable because they stay cooler and keep the urethane from melting. A band type we have found to work well is a 4 tooth per inch with
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Let’s jump in… The best way for us to get to know your project, and for you to get to know our capabilities, is to schedule a quick, virtual Introductory Meeting with our polyurethane experts. This 15-minute meeting saves you the typical lag of back and-forth emails and jump-starts your project.
We encourage you to share visuals and invite the necessary people to this meeting. Talk soon!
