PEEK is worth discussing when the part needs to retain mechanical performance under thermal load. The exact grade, fillers and chemical exposure still matter; the material name alone is not a service-temperature approval. [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]
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.
Mark the sliding face and mounting references. Tell us about the mating material, load, motion and replacement criteria rather than specifying color alone.
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.
| What the part needs | Material discussion | Information to provide | What still needs checking |
|---|---|---|---|
| Repeated sliding or wear | POM and nylon are discussion starting points. | Contact pressure, speed, lubricant and acceptable wear. | Confirm the grade and service condition before transferring a metal-part fit to a polymer. [2] [3] |
| Heat together with sustained load | Review a specified PEEK grade. | Continuous and peak temperature, dwell time and load. | Use the supplier data for the exact grade; a temperature figure is not a guarantee for the finished assembly. [1] |
| Humidity or intermittent water exposure | Compare moisture behavior, not just dry dimensions. | Humidity range, immersion, drying and inspection condition. | Nylon moisture uptake can change dimensions and properties; a dry measurement may not describe the in-service condition. [3] |
| A clear view through the part | Review the required acrylic / PMMA stock. | Viewing faces, haze, scratches, edge finish and cleaning. | Agree appearance acceptance and any polishing or stress-relief process before manufacture. [4] [5] |
| Electrical, food-contact or other controlled use | Start with the approved material specification. | Exact grade, color, additives, process and required evidence. | Do not infer suitability from a generic polymer name, a color or a photograph. |
This is a discussion guide, not an automatic material recommendation. The released specification and application review take precedence.
A milled plastic part needs support while material is removed. Send the model and drawing with pocket depths, thin walls and locating features identified. We can then discuss tool access, the surfaces used for clamping and any features that need a separate finishing setup.
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 may help with features on different faces, but the workholding and inspection access still need to suit the geometry. A process proposal should explain how the part will be held and checked, not simply name a machine.
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]
Specify the polymer, grade, supplier restrictions, reinforcement and color. A proposed substitute remains a proposal: changes to the compound or stock route should be approved and recorded rather than assumed from a similar material name.
| Feature | Specify on the drawing | Agree for acceptance |
|---|---|---|
| Bores, shafts and sliding fits | Mating dimension, fit, datum and operating condition. | Measurement condition and method; agreed samples where assembly behavior matters. |
| Flatness and parallel faces | Datum references, wall thickness and the permitted support condition. | How the part is supported during measurement and whether it is measured before or after assembly. |
| Hole position and threads | Datum system, hole pattern, thread form and useful depth. | Suitable gauges or measurements, including access to internal features. |
| Moisture or stress-relieved parts | Required conditioning, stabilization or stress-relief process, if any. | The sequence of conditioning, finish machining and final measurement. |
| Clear and cosmetic surfaces | Viewing faces, permitted marks and appearance criteria. | Approved reference sample or inspection criteria, lighting and protected packaging. |
There is no single tolerance that applies to every plastic, size and 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 does not replace a dimensional report, and an inspection report does not establish the suitability of the design for service.
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.
Selections are included with your inquiry. Nothing is sent until a live submission endpoint is connected and you submit the inquiry.
I have spent ten years in CNC, following the work my father’s generation began. With vetcnc, I want a new customer to understand the people and responsibilities behind an order before needing to travel to China.
We have several factories in China. When a requirement is outside our own scope, we can discuss a partner arrangement or make a direct introduction. We should be clear about who manufactures, who checks the work and who takes responsibility.
About vetcncReview whether the material and geometry fit the work we can accept.
Confirm the additional scope, responsibility and records before work begins.
Discuss direct contact with a suitable partner when that better fits the project.
This page covers PEEK, POM / acetal, nylon and acrylic. Send the exact material specification, stock form, color and required records. Other polymers can be reviewed, but a listed material is not a claim of current inventory or confirmed suitability for every geometry.
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. A generic polymer name does not establish compliance for a finished component.
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 a matching 3D model and dimensioned drawing, the exact material requirements, quantity and required delivery date. Add the operating environment, important dimensions, finish, sample approval and inspection records. The brief on this page helps collect those details.
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.
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 support general material discussion; they do not establish vetcnc stock, certification or the suitability of a finished component. Product-specific data and the released customer specification take precedence. Reviewed September 18, 2026.