PEEK may suit parts that need mechanical performance under thermal load. Grade, fillers and chemical exposure determine suitability, and an allowable service temperature is confirmed for the named grade.[1]
POM combines low moisture absorption with useful sliding properties. Specify POM-C or POM-H, rather than treating all acetal stock as identical. A drawing that names a particular brand or grade needs that requirement carried into the quote. [2]
Nylon can suit tough mechanical components, but it absorbs moisture. The resulting dimensional change depends on the grade and environment, so the required condition at inspection and in service should be stated. [3]
Acrylic is a candidate where a clear view through the part matters. Identify the viewing faces and edge appearance separately from dimensional tolerances; a machined surface is not automatically an optical-quality surface. [4]
More engineering plastics: ABS · HDPE CNC machining for custom polyethylene parts · PEI CNC Machining · Polycarbonate CNC machining for clear mechanical parts · Polypropylene CNC machining for custom PP components · PPS CNC Machining · PTFE · UHMW-PE CNC Machining
Show pocket depths, wall sections and the surfaces that locate the assembly. Identify holes that need inserts and faces where clamp marks are not acceptable.
Provide the mating shaft or bore, operating load and any lubrication. State the required inspection condition so the fit has an agreed meaning.
Guide blocks and wear pads need a defined sliding face and mounting references. Mating material, load, motion and replacement criteria guide the material choice.
For a gear, include the tooth specification and acceptance method; for a roller, identify the running surface, bore and bearing arrangement. Feasibility is geometry-specific.
List the electrical or handling requirement and the exact approved grade. Add the locating features and any areas requiring a clean, unmarked surface.
Identify the viewing area, edge finish, fasteners and cleaning method. State whether appearance is assessed against an approved sample or written criteria.
| Material / stock grade | Reference property | Test condition | Selection use |
|---|---|---|---|
| POM-C TECAFORM AH natural | Tensile modulus 2,800 MPa | ISO 527-2, 1 mm/min | Stiffness of guides and spacers |
| PA6 TECAMID 6 natural | Water absorption 0.30 / 0.60% | ISO 62, 24 / 96 h at 23°C | Moisture allowance for mating dimensions |
| Unfilled PEEK TECAPEEK natural | Tensile modulus 4,200 MPa | ISO 527-2, 1 mm/min | Compare stiffness with unfilled POM-C |
| Clear cast PMMA PLEXIGLAS GS 0F00 | Light transmittance ≈92% | D65, DIN 5036-3 | Clear viewing areas |
| Unfilled PEEK TECAPEEK natural | Volume resistivity 10¹⁵ Ω·cm | 23°C, 12% RH; silver electrode | Electrical-insulation grade selection |
Typical named-grade properties from Ensinger TECAFORM AH natural, TECAMID 6 natural and TECAPEEK natural product data, and Röhm PLEXIGLAS GS / XT. Finished-part wear life, service temperature and application approval come from testing at part level.
Pocket depth, thin walls and locating features determine tool access and workpiece support. Clamping surfaces and features that need a separate finishing setup also affect the milling plan.
CNC milling servicesFor bushings and spacers, define the surfaces that control the assembly. Include the useful bore depth, edge breaks, thread form and limits on workholding marks. The bore and outside diameter should be reviewed together when the wall is thin.
CNC turning servicesMulti-axis machining can provide access to features on different faces. Workholding and inspection access still need to suit the geometry.
5-axis CNC machiningMark thin sections, deep pockets and long unsupported features. Show where support or clamp marks are allowed, and which surfaces cannot be altered. Discuss any suggested wall, corner or stock-size change before releasing the drawing.
State the thread form, useful depth and how often the joint will be assembled. Where inserts are required, include the insert drawing or part number, retention requirements and whether installation is included in the order.
Include humidity, contact fluids, cleaning agents and operating temperature. Nylon is particularly worth reviewing for moisture-related size change; acrylic machining can introduce stress that may require an agreed relief step. [3] [5]
The material specification includes polymer, grade, supplier restrictions, reinforcement and color. Compound or stock-route changes need recorded approval, even when material names are similar.
| Feature | Drawing requirements | Acceptance conditions |
|---|---|---|
| Bores, shafts and sliding fits | Mating dimensions; fit; datums; operating condition | Measurement condition/method; assembly samples where specified |
| Flatness and parallel faces | Datums; wall thickness; permitted support | Defined support; before or after assembly |
| Hole position and threads | Datums; hole pattern; thread form; usable depth | Suitable gauges/measurements; access to internal features |
| Moisture-conditioned or stress-relieved parts | Conditioning; stabilization; stress-relief process | Specified conditioning, finish-machining and measurement sequence |
| Clear and cosmetic surfaces | Viewing faces; permitted marks; appearance criteria | Approved sample/criteria; inspection lighting; protective packaging |
Achievable tolerance follows the plastic, the size and the geometry. Keep critical dimensions distinct from general dimensions, and state the condition in which they must pass. We review the material, feature access and inspection method before accepting the requirement.
Functional surfaces with agreed tool-mark and edge requirements. State which faces matter for fit, sliding or sealing.
Specify edge breaks and any no-break edges. Internal passages need their own burr and loose-particle acceptance criteria.
Identify the viewing faces and final size. Agree the polishing method and any stress-relief sequence for the selected stock.
Provide the finish or marking specification, its location and the evidence required. Compatibility is reviewed for the exact polymer.
Acrylic stress relief and polishing are separate process decisions. ACRYLITE guidance describes annealing to relieve stress; the actual sequence must suit the selected material and geometry. [5]
Request the exact records needed for your order: supplier and grade identification, stock or batch references, and any required declarations. Define how material identification should be carried through machining, packing and delivery.
Specify the dimensions to report, the revision used and the agreed measurement condition. A material document and a dimensional report answer different questions, and suitability of the design for service stays with the designer.
For clear faces, clean assemblies or scratch-sensitive parts, define handling and acceptance before production. Tell us about allowed residues, protective wrapping, labeling and whether a sample must be approved before the full batch is released.
Ask for the exact compound, stock form and procurement assumptions to appear in the quote. A special color or approved-source restriction should not emerge after the order is placed.
Deep pockets, thin sections, critical fits and appearance requirements each affect the work needed. Highlight the genuinely critical features instead of applying the tightest requirement to every surface.
Request pricing for the quantities you actually expect to order. Keep sample approval, preparation work and recurring part costs separate so a prototype price is not mistaken for a repeat-production price.
Confirm the polymer, critical features, working conditions and requested records. Separate mandatory details from possible design adjustments.
Review material sourcing, machining, any finishing, inspection and sample requirements. Put price, scope and timing in the written quotation.
Evaluate the first parts against the agreed drawing and assembly criteria. Record changes under a new revision before releasing further quantities.
Keep the approved grade, revision, inspection condition and packing instructions linked to the order. Review changes before a repeat run.
This page covers PEEK, POM/acetal, nylon, acrylic, ABS and PTFE. Send the exact grade, stock form, color and required records so availability and machining scope can be confirmed for your part.
POM has low moisture absorption and useful sliding properties. Nylon offers a different balance of toughness and moisture behavior. Give us the load, motion, mating surface and environment; selection should be checked against the actual grade data and your design. [2] [3]
PEEK is a high-performance polymer used where thermal and mechanical demands occur together. State the exact grade, continuous and peak temperature, exposure time and load. Suitability and machining feasibility are reviewed for that specification rather than assumed from a generic temperature rating. [1]
Not necessarily on every face. Identify which faces are viewed through, the acceptable marks and any required polishing. Agree appearance and dimensions separately, including a reference sample when useful. [4] [5]
Send the drawing with the critical dimensions and datums identified. We review the polymer, geometry, stock condition, feature access and measurement method before accepting tolerances. A blanket tolerance on this page would not describe every part reliably.
That needs to be agreed for the application. Nylon absorbs moisture, and this can change dimensions and mechanical properties. Put the intended moisture or conditioning state and acceptance method into the specification. [3]
Do not treat a material change as only a change of raw stock. Review the assembly load, temperature, clearances, fastening method and acceptance criteria with the drawing authority. A proposed plastic version should be evaluated before it replaces the original design.
Include the insert specification or part number, installation requirements, retention checks and marking location. We can then review the requested work and confirm what is included in the quote. Do not assume every insert or process suits every plastic.
Tell us exactly which records are required and the material source restrictions. Required documents and the scope of verification must be agreed before sourcing. Compliance for a finished component rests on the agreed documents and material-source restrictions, settled before sourcing.
A sample is particularly useful when assembly fit, appearance or handling needs confirmation. State the approval criteria and whether production must wait for written approval. Sample quantity, timing and batch release are agreed with the quotation.
Send the matched 3D model and dimensioned drawing, material grade, quantity and required delivery date. Include the working environment, critical dimensions and inspection requirements. Use the inquiry button to contact us directly.
Discuss confidentiality and the permitted sharing scope before sending restricted files. If the project needs a partner, agree the arrangement and responsibility with VETCNC first; direct introduction is also an option to discuss.
Agree confidentiality and the transfer method before sharing sensitive or restricted files.
Share your drawing, material and quantity. Tell us what you need and we will reply by email.
Grade-specific thermal, mechanical and chemical considerations.
POM-C and POM-H; sliding properties and moisture absorption.
Nylon families and moisture-related changes in dimensions and properties.
Acrylic / PMMA material background; confirm the actual grade and appearance requirements.
Stress relief after fabrication; treatment must suit the actual material and part.
Manufacturer references for polymer properties and machining. Product-specific data and the released customer specification govern the order.
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