Magnetic compounds · Molded geometry · Drawing review
Define the magnetic part and its interfaces
Injection molded magnets combine magnetic powder with a polymer binder in a molded part. For a custom design, Magnetstek reviews the proposed compound, geometry, magnetization and operating conditions before confirming feasibility and a quotation.
Send the drawing or model, critical fits, target field and quantity. Include any inserts, shafts or mating components so the material and tooling requirements can be discussed together.
Identify the working gap, locating surfaces, bore and any insert. Mark the relationship between the magnetic poles and the mechanical reference features on the drawing.
Compound & geometry
NdFeB, ferrite and SmCo powder systems offer different material options. A molded compound’s properties also depend on its binder, powder loading and orientation.
Provide an existing grade or compound callout if your drawing specifies one. Otherwise, describe the required field, flux or torque and its measurement conditions so a proposed material can be reviewed.
Polyamide and PPS are examples of binders used in magnetic compounds. Selection needs the proposed material data and the part’s thermal, moisture, chemical and mechanical conditions.
For a design involving inserts, show the shaft, bushing or housing dimensions, locating features and required fit. Confirm the material combination and tooling scope with the drawing review.
What to specify
Mark the drawing revision, critical dimensions and pole pattern. Include the mating-part interfaces and the conditions used for magnetic acceptance.
Provide the revision, dimensions, tolerances, wall sections, bores and locating surfaces. Mark which dimensions are critical in the assembly.
State a mandatory powder, polymer or compound grade if known. Identify requirements that can be reviewed with an alternative.
Show any shaft, bushing, housing or other component. Define interfaces, assembly loads and the proposed supply scope.
Mark pole faces, pole count, orientation and an angular reference. Specify the field or torque target and where it is measured.
Include continuous and peak temperature, duration, cycling, moisture, chemicals, load and any protective finish or housing.
Give sample and production quantities, tooling constraints, inspection checks and required records. Confirm price and delivery with the quote.
Application review
For a sensor, encoder or small motor design, specify the field or torque needed at the working gap and show how the pole pattern aligns with the assembly. For a rotor, include the shaft interface, retention, speed, balance and temperature requirements.
Use the rotor and arc magnet review to prepare the assembly information. Material and manufacturing scope are confirmed from the drawing.
Geometry concepts
These concepts show the features to define in an RFQ. The proposed compound, forming details and pole arrangement need review for the finished part.
Define the bore, wall section and active magnetic surface. Mark the pole pattern and the working gap.
Discuss this geometry
Show locating shoulders and critical fits. Review the molding geometry and measurement conditions together.
Discuss this geometry
Provide the mating-part drawing, alignment surfaces and retention requirements for an assembly review.
Discuss this geometry
Use a drawing or model to describe the outline, holes and mating surfaces for feasibility review.
Discuss this geometryAI-generated geometry illustrations; they do not identify a supplied grade or an available stock item.
Technical reference
Review the topics relevant to your part and request the supporting compound data with the quotation.
Identify the proposed compound and its magnetic powder, binder and orientation. Compare remanence, coercivity and energy-product values with their units, measurement conditions and temperature.
For the finished part, agree the required dimensions, pole arrangement and magnetic output separately. List any compound datasheet or temperature-dependent demagnetization curves needed for the review.
Confirm whether the proposed material needs magnetic orientation during forming and how that orientation relates to the final pole pattern. Review the material, tooling and magnetization requirements together.
A ring or shaped-part name leaves the pole arrangement open. Mark the intended poles and their relationship to any mechanical reference on the drawing.
Identify critical fits, wall sections, holes, ribs and mating surfaces. Discuss the dimensions and measurement conditions for the proposed compound and tooling.
Consider the effect of molding shrinkage, conditioning and the operating environment on the finished dimensions. Confirm achievable tolerances through the part review and the agreed sample inspection.
Provide the insert material, drawing, dimensional limits and required location in the molded part. Define assembly loads, retention requirements and the surfaces used for alignment.
Clarify whether the request covers a magnet alone or a proposed assembly. Review the interface and inspection plan before confirming the tooling or manufacturing scope.
Review the magnetic powder, binder, geometry and complete exposure cycle. Include continuous and peak temperature, duration, opposing fields and the working point.
State the test method and conditions behind any physical-property value, including heat-deflection data. Agree which material limits and finished-part tests are relevant to the actual service conditions.
Describe humidity, liquid or chemical contact, cleaning and expected exposure duration. Include any protective coating, encapsulation or housing and its dimensional allowance.
Confirm the proposed compound’s environmental data and the acceptance test. Define the conditioning used for dimensional and magnetic measurements where it matters.
Specify the pole count, active surface, pole sequence and angular reference. Show the sensor position, working gap and mating components.
Agree the field, flux or waveform requirement, fixture, measurement location and allowed range. Use the same conditions when comparing samples and later deliveries.
Magnetization direction reference →Agree the drawing revision, sample size, dimensional checks, polarity or field tests, surface condition and any environmental qualification. Identify the records required for the compound and for the finished part.
Provide applicable system or device requirements for regulated or safety-critical uses. Confirm the available documentation and supply scope before the order.
First article inspection checklist →From drawing to quotation
Step 1
Provide the drawing, magnetic function, interfaces, operating conditions and quantity.
Step 2
Discuss compound, geometry, inserts, orientation, magnetization and tooling requirements.
Step 3
Confirm critical dimensions, magnetic acceptance, conditioning and the required records.
Step 4
Review specifications, tooling terms, quantities, price and delivery before ordering.
Documents & related options
List required compound data, magnetic curves, environmental tests and inspection records in the inquiry. Confirm their applicability to the proposed part and availability with the order.
Collect the geometry, magnetic function and operating conditions.
RFQ checklist →Compare the forming route against the required part and quantity.
Bonded magnets →Describe the mating parts, retention and output at the working gap.
Assembly requirements →Review a different material against the same design conditions.
Custom NdFeB →Technical context: thyssenkrupp’s plastic-bonded NdFeB material reference and NTN Advanced Materials’ sensor magnet comparison. Their material and test information illustrates how properties are specified; it is not a Magnetstek product specification.