0.01mm Tolerance Compound Angle Machining Angled Mounting Base and Wedge Block for Prototype Small Batch

Dongguan Changxinda Precision Technology Co., Ltd. is a contract machining supplier established in 2008, operating from a plant in Dongguan equipped with 4-axis and 5-axis machining centers, turn-mill combined lathes, and CNC lathes, supported by a team of more than 90 people. Roughly 50 to 60 percent of our output ships to overseas buyers in robotics, automation, medical equipment, automotive, aerospace, laser, LED, and lithium battery equipment. We take on work that does not exist in any catalogue: parts defined only by a customer drawing, a 3D model, or sometimes a worn sample that has to be reverse engineered.

This product line covers angled mounting bases and wedge blocks machined from 6061-T6 or 7075 aluminum plate, where the functional faces are not square to each other. The part carries two or more compound inclined faces, dowel pin bores, counterbored fixing holes, and a machined reference edge. It is the kind of component that positions a sensor, a laser head, a camera module, or a gripper at a specific compound angle — and it only works if that angle is right the first time.

A face that is inclined in two directions at once cannot be produced by simply tilting a vice in one plane. We choose the setup according to the angle and the tolerance attached to it.

• 3 plus 2 positioning is used when each inclined face can be reached by indexing the trunnion to a fixed orientation. It gives the highest rigidity, so face flatness and surface finish are easier to hold.
• Simultaneous 5-axis contouring is used where the inclined face blends into a curved wall, or where a ball nose tool must be kept normal to the surface to avoid step marks between passes.
• Single datum, one program. The part is modelled from the same datum scheme as the drawing, and all inclined faces are generated from that coordinate system. This is what keeps the relationship between two angled features correct, instead of holding each angle separately and losing the intersection.
• Stock and stress control. Plate stock is face milled on both sides before the angle cuts, and roughing is done symmetrically. Angled thin sections are released before the finishing pass so the surface does not spring back after the fixture is opened.
• Cutter approach. Inclined seats are finished with a tool path that enters normal to the face, using a corner radius end mill for the seat and a ball nose for blends. Sharp internal corners that a rotating tool cannot reach are flagged in the DFM report with a proposed corner radius, rather than silently left with a tool mark.

The declared accuracy on this part family is ±0.01 mm on hole position and bore size, with angular tolerance of ±0.05 degrees on the inclined faces and flatness of 0.01 mm per 100 mm.

• Three-plane datum scheme (A, B, C) established on the machined reference edges, not on saw cut surfaces
• True position of angled holes verified against the datum frame, not against the nearest edge
• Dowel bores machined to H7 with a boring head for size control, then checked with pin gauges
• CMM measurement on a rotary table so inclined features can be probed normal to their surface
• Angle verification with a sine bar and gauge blocks as an independent cross check
• Metrology room held at 20 degrees Celsius, CMM resolution 0.001 mm
• First article report with a ballooned drawing, 15 to 25 measured dimensions, plus material certificate

Most projects in this part family start as one or two pieces for validation, then move to a small batch. The workflow is built around that reality.

1. Step 1 — Drawing review, within 24 hours: we check datum choice, angle definition, corner radii, bore tolerances, and finish callouts, and return a marked-up PDF with questions and cost-down suggestions.
2. Step 2 — Quotation: price is built from the process route, not from a per-kilo rate, so the number you receive is the number the part actually costs to make.
3. Step 3 — First piece: 3 to 5 working days for a single prototype, including first article inspection.
4. Step 4 — Approval loop: dimensional report and photos are sent before shipping, so any deviation is discussed before the parts leave the plant.
5. Step 5 — Batch release: 11 to 100 pieces run in 7 to 14 working days on a proven program, with the same fixture and the same inspection plan as the first piece.

Customization is open-ended. We accept STEP, IGES, X_T, DWG, DXF, and PDF files, or a physical sample. Material can be 6061-T6, 7075-T6, 5083, 2024, plus 304 or 316L stainless steel where the environment demands it. Finish options include clear anodizing, black anodizing, hard anodizing, bead blasting, laser marking, and chromate-free conversion coating. Inserts such as helicoils and pressed bushings can be installed and inspected in-house.

A prototype shop that misses dates is worse than no shop at all, so the schedule is managed as a commitment rather than an estimate.

• Every order is assigned a named project engineer who owns the delivery date
• Prototype orders are not queued behind mass production runs; they are scheduled into a dedicated slot
• Weekly progress mail with work-in-progress photos, and a written notice at least 5 working days ahead if a date becomes at risk
• Repeat batches keep reserved machine capacity, so the lead time does not creep upward order after order
• Shipping by express, air, or sea, door to door, with export documentation prepared in-house
• Parts are packed in foam-partitioned cartons, with protective wrapping on machined inclined faces