CNC Machining FAQ

Karry Precision provides custom CNC machining, plastic injection molding, prototyping, surface finishing, assembly, and related manufacturing support. We serve projects ranging from individual prototypes to low-volume and repeat production.

Please provide 2D drawings or 3D CAD files, material requirements, quantities, surface finishes, tolerances, and any special inspection or assembly requirements. Complete project information helps us prepare a more accurate quotation.

Commonly accepted formats include STEP, STP, IGES, IGS, X_T, STL, DWG, DXF, and PDF. STEP files are generally preferred for reviewing three-dimensional part geometry.

Yes. We support rapid prototypes, engineering samples, low-volume production, and repeat manufacturing. The production process can be adjusted according to the required quantity, material, tolerance, and delivery schedule.

We work with a wide range of metals and engineering plastics, including aluminum, stainless steel, carbon steel, brass, copper, titanium, ABS, PC, POM, PA, PMMA, PEEK, and other application-specific materials.

Lead time depends on part complexity, quantity, material availability, surface treatment, tooling requirements, and inspection standards. Simple prototypes may be completed relatively quickly, while molds and larger production orders require additional preparation time.

Yes. Available secondary services may include anodizing, plating, painting, powder coating, polishing, sandblasting, heat treatment, printing, laser marking, and mechanical assembly. Suitable options depend on the part material and application.

Customer drawings, CAD files, specifications, and commercial information are handled as confidential project data. Non-disclosure agreements can also be signed when required before technical evaluation or production.

Achievable tolerances depend on part size, geometry, material, machining method, and measurement requirements. General machining tolerances are applied unless tighter tolerances are clearly marked on the drawing and reviewed by our engineering team.

Yes. Our engineers can review wall thickness, corner radii, tool accessibility, undercuts, draft angles, tolerance requirements, and material selection. Design for manufacturability recommendations can help reduce production risks and unnecessary costs.

Three-axis machining is suitable for many standard prismatic parts. Four-axis machining supports rotational features and multiple-side processing, while five-axis machining is better suited to complex surfaces, compound angles, and parts requiring fewer setups.

Only functionally important dimensions should receive tight tolerances. Drawings should clearly define dimensional tolerances, geometric tolerances, datum references, surface finish, threads, critical features, and inspection requirements.

A draft angle of approximately 1° to 2° per side is commonly recommended for standard surfaces. Textured surfaces, deep ribs, and complex geometries may require larger draft angles to support reliable mold release.

Consistent wall thickness, properly designed ribs, balanced gate placement, suitable cooling, appropriate material selection, and controlled molding parameters can help reduce sink marks and warpage. Thick sections should be cored out whenever possible.

Major cost factors include material, part dimensions, geometric complexity, tolerance level, setup time, machining time, tooling structure, surface finish, inspection requirements, assembly work, and order quantity.

Inspection may include incoming material verification, dimensional measurement, visual inspection, thread and gauge checks, surface finish evaluation, functional testing, and final shipment inspection. Inspection reports can be prepared according to project requirements.