Rare Earth Magnet Manufacturing
Mission-critical rare earth magnet wire saw operations depend on precision guide rollers and pulleys for reliability with every cut.
— The Recurring Problems
Tight, repeatable slices
Guide roller or pulley wear lets the wire walk and ruins cut consistency
Overseas-only servicing
Guide rollers and pulleys are sourced and serviced from the saw OEM overseas
Consumables that wear
Guide rollers and pulleys wear under diamond-wire contact and need frequent replacing
Scarce, costly feedstock
Yield loss and scrap hit far harder on scarce, costly rare earth manufacturing
US-content requirements
Defense and other government programs require US-origin supply chains
— The Differentiator
Where overseas-sourced wire-saw consumables fall short
Today most US plants service their wire saws through the saw OEM overseas — the OEM specifies urethane guide rollers and pulleys, so replacements and servicing come from abroad — and that path falls short:
- High transportation cost to ship guide rollers and pulleys from the overseas OEM
- Long lead times on overseas-sourced replacements and servicing
- To cover those lead times, plants carry many more spare rollers and pulleys — tying up capital and floor space
- Downtime risk if a consumable isn't on hand when it's needed
- For defense and other government programs, overseas sourcing can be a compliance problem
The Result – High servicing cost, oversized spare-parts inventory, downtime risk on the most critical material in the line, and a supply chain that can clash with defense or government requirements.
— Solution Spotlights
The custom parts that solve it
Wire Saw Guide & Pulleys
On a diamond wire saw the guide rollers and pulleys hold the wire in precise alignment. MPC manufactures, coats, grooves and refurbishes them in-house, made in the United States with short lead times. Most new US magnet teams have never run a wire saw, so MPC brings its extensive experience in this space to help them onboard and support their wire saw operations efficiently — a partnership, not just a parts order.
Polyurethane Wheels
Wire saws aren’t the only machines that wear. Grinders, lathes and other magnet-handling equipment use urethane wheels and other components that need domestic replacement, and MPC can engineer and supply them in the United States.
Polyurethane Rollers
MPC manufactures and supplies urethane rollers for grinders, lathes and handling equipment across the magnet manufacturing process, so more of the line’s wear parts come from one domestic partner.
Polyurethane Bumpers
MPC also supplies the custom urethane bumpers that protect magnet-handling equipment, engineered and made in the US alongside the wheels and rollers.
Talk it through with a polyurethane expert who’ll tell you what’s achievable and what is not.
— Technical Specifications
The specs that matter for wire-saw guide rollers
Property
Range for this application
Hardness
ASTM D2240
- Durethane® S hardness range shore 20A–70D
- Hardness of wire saw guide rollers and pulleys is typically in the 85A-95A range
Durethane® S mechanical properties
- Tensile strength 250–7,800 PSI
- Tear strength, Die C 30–800 PLI
- Elongation 160–850%
Groove geometry
- Custom groove profile and pitch; molded and grooved in-house
- Tailored to your machine type and cut set-up
Abrasion and surface finish
High abrasion resistance polyurethane materials with tolerance to tight surface finishes
Chemical exposure
Thermoset polyurethane resists a wide range of chemicals and oils — see the chemical resistance table for the general guideline by substance
Relevant technical downloads
Document
What it gives the engineer
Hardness 20A–70D with tensile, elongation, tear and compression set per material.
General chemical resistance guidelines
— HOW IT WORKS
From concept to scaled production
Connect With Us
Share your application, performance needs, or a part you want to improve.
Collaborate on Design
Our engineers will help optimize materials and geometry for manufacturability.
Prototype & Refine
We produce samples using our proprietary polyurethane formulations for testing.
Move to Production
Once approved, we move to scalable molding with full quality assurance.
That’s exactly the conversation we like to have – get a polyurethane expert on a quick call to pressure-test your idea before you commit.
— Proof
Case studies & white papers
White Papers
Engineering Polyurethane Components for Heavy-Duty Applications
Modern automation pushes mechanical parts past what standard materials can handle. This white paper covers the material, process, and design choices behind heavy-duty polyurethane components for robotics and precision systems, so they hold up under continuous duty.
Engineering Urethane Wheels and Rollers for Robotics and Automation
Wheels and rollers are among the hardest-working parts in any automated system. This white paper walks engineers through designing them for load, wear, traction, and reliability in heavy-duty robotics, so they last instead of becoming the weak link.
— Design Guide
How to specify and refurbish custom urethane wire saw guide rollers and pulleys for magnet slicing
What to consider, what’s possible, and where custom urethane outperforms other material options – drawn from the same expertise MPC brings to your application.
— FAQ
Frequently Asked Questions
What urethane guide-roller / pulley spec holds wire alignment and tension when slicing hard, brittle sintered rare earth magnet blocks?
A polyurethane guide roller with custom groove geometry. MPC coats and grooves the wire-contact surface to hold the diamond wire in precise alignment as it cuts the hard, brittle media — so cuts stay consistent and in tolerance.
How do I reduce chipped slices, taper and kerf loss on expensive rare earth magnet material?
Keep the wire from walking. Worn or imprecise guide rollers let the diamond wire drift, chipping corners and tapering slices — wasting costly materials. MPC’s expertise in wire saw rollers and pulleys can keep your operations running smoothly, keeping cuts consistent and reducing scrap.
Can I source wire-saw guide rollers and pulleys domestically instead of waiting on long overseas lead times from the saw OEM?
Yes. MPC services and manufactures wire-saw guide rollers and pulleys in the United States, so you avoid the transport cost, long lead times and oversized spare inventory of working with an overseas saw OEM — and get parts when you need them.
Can I get wire-saw guide rollers and pulleys made in the US to meet defense and other government sourcing requirements?
Yes. MPC’s wire-saw guide rollers and pulleys are made in the United States, which supports the US-origin supply-chain requirements that defense and other government programs carry — whereas overseas-sourced consumables can be disqualifying.
Can you qualify and scale wire-saw guide rollers and pulleys while our new plant is commissioning?
Yes. MPC works with new plants as they commission new wire saws — helping identify groove pitch and other critical specifications, then qualifying and supporting the wire saw operations through scale-up. For teams new to wire saws, MPC brings its decades of experience to shorten your learning curve.
Can you re-coat and re-groove our wire saw guide rollers domestically to our tight tolerances?
Yes. MPC re-coats and re-grooves worn guide rollers in the US, restoring the groove geometry that keeps the wire aligned and extending service life — without shipping consumables overseas for servicing.
— Keep Exploring