Deep Recess Cup Body and Thin Wall Cup with 0.01mm Wall Thickness, Ultrasonic Wall Verification and 0.01mm Bore to OD Runout

A deep recess cup body with the wall held to 0.01 mm at depth, with the bore measured where a dial cannot reach. Wall thickness is verified by ultrasonic mapping plus CMM section, and bore-to-OD runout at depth is held to 0.01 mm — measured inside the recess, not at the mouth.

• Wall thickness±0.01 mm, ultrasonic plus CMM section
• Bore to OD runout at depth0.01 mm, measured inside the recess
• Order size1 piece, prototype in 3–7 working days
• Materials6061 / 7075 aluminium, SS304 / 316L
• Bore capability4×D and deeper
• Quality systemISO 9001:2015, exporting since 2008

A cup body with a deep recess and a thin wall has two enemies, and neither shows up at the mouth. The first is chatter: a boring bar hanging four diameters deep in a 1.5 mm wall will ring, leaving a lobed bore that a two-point measurement reads as round. The second is wall thickness drift: the outside is turned first, then the bore is opened from the inside, and any offset between the two turns into an egg-shaped wall that looks fine at the opening and pinches near the bottom.

We attack both with sequence and support. The outside is semi-finished, the bore is roughed out while the wall is still thick enough not to deflect, the outside is finished, and only then is the bore finished with a damped boring bar at a modest depth of cut. Wall thickness is verified ultrasonically at several heights and a sample is sectioned on the first article, so the number on the report comes from inside the part rather than from the rim.

• Material: 6061 and 7075 aluminium for lightweight cups, SS304 and 316L for corrosion and hygiene, brass C36000, 17-4PH, PEEK and PTFE for chemical service.
• Geometry: deep recess cup, conical bottom, flat bottom, radius bottom, stepped bore, internal groove, cross port, flange, hex or spanner flats, thin wall from 0.8 mm.
• Depth to diameter: 4×D standard, deeper on review with a specific tooling plan agreed before quotation.
• Finish: passivation, anodising for aluminium, electropolish, bead blast, black oxide, as-machined bore.
• Size: body diameter 10 mm to 150 mm, depth 10 mm to 250 mm.
• Input: STEP, IGES, DXF, PDF drawing, or a sample cup we measure and re-model.

A deep cup drawing describes an internal volume, a bottom geometry and a wall — often the working chamber of a device, which is the part of the design a customer least wants circulated. 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. No photographs of customer parts are taken for our catalogue or website, customer parts are never displayed or reused as samples, subcontracting requires your written approval, and at program close files, sectioned samples and inspection data are deleted or returned with written confirmation.

Dongguan Changxinda Precision Technology Co., Ltd has been machining custom parts since 2008: 15+ years, 90 to 100 staff, 50–60% exported to North America and Europe, 200+ customers served, turnover in the RMB 10–20 million band. The floor holds CNC lathes, turn-mill combined centres with live tooling and sub-spindle, and 4-axis / 5-axis machining centres under an ISO 9001:2015 system, producing parts for medical, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision instrument programs. Deep bore turning, grooving, ultrasonic wall measurement and CMM inspection are in our own plant in Dongguan.

Deep recess and thin wall turned parts from this plant ship into ten industries. Each line is a category we machine regularly, with the parts customers actually order.

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: 3–7 working days after drawing approval, including inspection.
• Small batch 10–100 pcs: 7–14 working days.
• Repeat orders: run from archived programs, boring bar and damped bar settings; wall and depth repeat to the same values.
• Capacity: 10,000 pieces per month across the plant.
• Visibility: a dated progress note with photographs of your actual parts at roughing, bore finishing and inspection.
• Shipping: parts nested in foam, bores protected, cartons marked so a thin wall cup is not crushed by stacking.
• Rush: overtime slots held weekly; tell us the deadline and we confirm before you order.