Recess Bore Mounting Plate with Recess Depth 0.02mm and Hole Pattern Checked, Post-Coating Verified Mounting Plate

A mounting plate with several circular recesses looks like a turning job with a few holes added. In service, each recess holds a lens, a boss or a bearing seat, and each one is judged against the face it sits in — a bore 0.03 mm deep measured from the wrong face will not seat its part, even though the number in the programme is correct. Add a hole pattern that has to line up with a mating plate and the problem multiplies: bores that are individually good but positioned as a pattern by two separate setups will not assemble.

So we machine the plate from one datum face, cut every recess from the face it belongs to, and drill the hole pattern in the same setup family so position is a pattern property rather than a sum of individual tolerances. Anodising is then compensated: the coating grows into the bore and adds to the face, so recess diameters and depths are adjusted before coating and verified after it — not before.

• Material: 6061-T6 standard, 7075-T651 for higher strength, 5083 for weldability, 2024 where specified, stainless 304 for corrosion-critical plates.
• Features: single or multiple recess bores, stepped recess, recess with a bottom relief groove, through bore with counterbore, dowel holes, tapped holes, slots, lightening pockets, spigot.
• Patterns: any bolt circle or rectangular grid, clocked patterns, mixed hole sizes, helicoil or insert threads.
• Finish: clear or black anodising (Type II or III), chem film, chromate conversion, bead blast, laser marking, as-machined.
• Size: diameter 20 mm to 400 mm, thickness 3 mm to 60 mm.
• Input: STEP, IGES, DXF, PDF drawing, or a sample plate we measure and re-model.

A mounting plate drawing carries a hole pattern, a recess depth and often the optical or sensor interface it serves — the pattern alone can describe an instrument. We sign a mutual NDA before any file is opened, in English or Chinese or on your own form, and return a countersigned copy before work starts. Access is limited to the project engineer, the lathe programmer and the cell supervisor, with the file in a restricted folder rather than the open shop network. The cell is camera free: no photographs for our catalogue or website, no customer part kept on display or reused as a sample, subcontracting only with your written approval, and at program close drawings and inspection data are deleted or returned with written confirmation.

Dongguan Changxinda Precision Technology Co., Ltd has machined custom metal parts since 2008: 15+ years, 90 to 100 staff, 50–60% of output exported to North America and Europe, 200+ customers served, turnover in the RMB 10–20 million band. The plant runs CNC lathes, turn-mill combined centres with live tooling and sub-spindle, and 4-axis / 5-axis machining centres under an ISO 9001:2015 quality system, serving medical, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision instrument programs. Turning, recess boring, pattern drilling, anodising coordination and CMM inspection are managed in our own plant in Dongguan.

Turned and milled plates from this plant ship into ten sectors. The list is what customers order, not a marketing wish-list.

All ten sectors run through the same plant and the same ISO 9001:2015 inspection discipline — only the material, finish and documentation package change.

• Prototype: 4–8 working days after drawing approval when anodising is included.
• Small batch 10–100 pcs: 8–15 working days.
• Repeat orders: released from archived program and fixture; recess depth and pattern position repeat to the same values.
• Capacity: 10,000 pieces per month across the plant.
• Visibility: a dated progress note with photos of your actual plates at recess boring, drilling and post-coating measurement.
• Shipping: faces protected with film, plates separated by foam, cartons marked fragile so a coated face arrives unmarked.
• Rush: anodising slots booked weekly; tell us the deadline and we confirm before the order.