Custom Parts
Custom CNC Parts
Custom CNC parts are machined to your print or 3D model instead of bought from a catalog: brackets, plates, housings, shafts, bushings, fittings, and the replacement part nobody stocks any more. Send a STEP file, a PDF drawing or both. A person reads the files and sends back a price, a lead time and design notes in 24-48 hours, and every part is inspected against your print before it ships. If a part doesn’t match the print, it’s remade or credited.
Updated October 2026
Example part, shown for illustration.
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Get a Quote in 24-48 Hours
Send us your files and we’ll quote it, usually within 24-48 hours.
Need an NDA before you send files? Ask for one and it’s sent the same day.
Commercial work only. We don’t quote firearms, DoD, ITAR, or EAR-controlled parts.
Or email your print to evan@micncparts.com.
No account, no portal: one contact for every order.
What can be made as a custom CNC part?
Most parts that can be cut from bar, plate or sheet and drawn on a print can be quoted, in any of the materials listed under At a Glance. Other alloys and plastics quoted on request. Name the grade on the print. Most listed grades have their own page in the materials index, and if the material is still open, the CNC material selection guide compares them.
You do not need to name a process to get a quote. Round parts are turned: the stock spins while a nearly stationary tool cuts cylinders and flat faces (source 1). Blocky and flat parts are milled: a rotating cutter cuts faces, slots, pockets and threads (source 2).
The table covers the rest, and most of these part types have their own page in the custom machined parts index. Parts for a robot cell or an automated line, such as motor mounts, gripper plates and bearing blocks, are quoted the same way, and the robotics and automation page lists the typical ones.
| Part | Examples | Usual process |
|---|---|---|
| Round | Shafts, including keyed and splined shafts, pins, bushings, spacers, fittings, knobs | CNC turning (source 1). A spline is cut by a separate method, such as milling, broaching or shaping (source 9). Small, slender parts in volume often go on a Swiss-type lathe, where a guide bushing supports the stock next to the tool (source 3) |
| Flat or blocky | Brackets, plates, housings, manifolds, fixture plates | CNC milling (source 2) |
| Hardened or intricate profile | Punches, die inserts, parts in hardened tool steel | Wire EDM, which cuts hard, electrically conductive metal that is difficult to machine another way (source 4) |
| Tight size, flatness or finish | Ground pins, bearing fits, flat plates, hardened parts | Grinding, which gives accurate dimensions and fine finishes and suits hard material (source 5) |
| Flat profile from sheet | Plates, cut-and-bent brackets, panels | Laser cutting (source 6). Laser lead time: quoted per job, rush available |
What should the print say, and what should you expect?
Put the finish and the revision letter on the print, and the quantity in the request. Anodize on an aluminum part can be clear, black or a dyed color such as blue, and CNC machined aluminum parts covers the grades and finishes in detail. Any dimension without its own tolerance takes the default tolerance in the title block (source 7), so a tighter number belongs only on the features that need it, such as a bearing bore or a locating pin: the tighter the tolerance, the more the part costs to machine (source 8). What each process holds is on the precision machined parts page.
With no drawing, a STEP file is quoted to ±0.005 in, or to the tolerance your notes name, and the STEP file quoting page says when a drawing is asked for instead. Either way, the design-for-manufacturing notes that come back with the quote point out what will cost more than it needs to and what may not work, before anything is ordered.
No C of C or material certifications ship with parts by default. If your PO needs them, say so before the quote. Inspection reports on critical dimensions aren't included by default. If you need one, ask when you place the order.
Lead time starts at order approval. Put your need date in the part description and the quote answers it. Rush 1-2 weeks applies to machined parts with no secondary operations. Heat treat, grinding, EDM and finishing add time, and the quote gives the real date.
Sources
All accessed 27 September 2026. Where a figure here differs from your print, the print governs.
1. Wikipedia, "Turning": en.wikipedia.org/wiki/Turning (a nearly stationary tool cuts a rotating workpiece; cylindrical shapes and flat surfaces).
2. Wikipedia, "Milling (machining)": en.wikipedia.org/wiki/Milling_(machining) (rotary cutters; flat faces, slots, threads and flat-bottomed cavities).
3. Wikipedia, "Metal lathe", section "Swiss-style lathe / Swiss turning center": en.wikipedia.org/wiki/Metal_lathe (tools cut next to the guide bushing, where the stock is most rigid; ideal for slender workpieces and for large production runs of small-diameter parts).
4. Wikipedia, "Electrical discharge machining": en.wikipedia.org/wiki/Electrical_discharge_machining (works on electrically conductive material, including hardened tool steels; wire EDM for punches, tools and dies from hard metals).
5. Wikipedia, "Grinding (abrasive cutting)": en.wikipedia.org/wiki/Grinding_(abrasive_cutting) (very fine finishes and very accurate dimensions; better suited than cutting to very hard materials).
6. Wikipedia, "Laser cutting": en.wikipedia.org/wiki/Laser_cutting (sheet metal cutting; metals and plastics).
7. Wikipedia, "Engineering drawing": en.wikipedia.org/wiki/Engineering_drawing (the title block carries default tolerances for dimensions with no tolerance of their own; the revisions block).
8. Wikipedia, "Design for manufacturability", section "Tolerances" under CNC machining: en.wikipedia.org/wiki/Design_for_manufacturability (the tighter the tolerance, the more a part costs to machine).
9. Wikipedia, "Spline (mechanical)": en.wikipedia.org/wiki/Spline_(mechanical) (external splines may be broached, shaped, milled, hobbed, rolled, ground or extruded).
Questions
Before you send a job.
01 Can you make a replacement part for a machine?
If the part is machined, yes. A nozzle mount, a set of soft jaws, an adapter plate, a bushing or a shaft is quoted from its print. Cast parts are not quoted, either as a casting or as a machined replacement for a part that was originally cast. With no print, a sketch, a photo or a new sample part can start the quote. The sample ships back with the parts. The CAD work to draw it up from a sketch or sample is quoted up front, as its own line, and the no-drawing route covers what to send. A stock item with the maker’s part number on it, such as a linear guide block, a way cover or a cutting insert, is ordered by that number from the machine builder or a distributor.
02 Can one quote cover several quantities?
Yes. Ask for more than one quantity, such as 1, 25 and 100, and the quote shows each.
03 I already have a quote from another supplier. Can you meet it?
Send it with your files. On like-for-like parts you get a price that meets or beats it, or a straight no. To move the part number over for good, the machined parts supplier page covers how the ongoing arrangement works.
Related
Where to go next.
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