Gongyan: start with the optical surface, not the smallest number.

Choose the surface and the manufacturing route

Rotational optical surface

SPHERE200 ↗

The original reference describes spherical mirrors and mirror finishing of flat and cylindrical surfaces, using an aerostatic spindle and rotary tool table. Begin with the substrate, clear aperture and required surface form.

Flat optical surface or prism

SQUARE-200 ↗

The 80/200/300 family has different travel, spindle-to-table height and cutter sweep. Indexing, turning conversion and a special CNC are optional packages; identify the required operation first.

Holes and milled features

FANUC α-D14MiA reference ↗

A BT30 drill/tap and milling route for a different job. Gongyan's page identifies FANUC as the manufacturer and describes its own agency sales/service role. It is not a Gongyan-built optical finishing machine.

The company also lists horizontal, vertical and five-axis machining centres, special machines and functional components. The three references below explain distinct processes; they are not a complete catalogue or proof that all optional operations coexist on one build.

SPHERE200: keep the rotary-table and no-table envelopes separate

The source lists 200 mm maximum workpiece swing with the rotary table and a 450 mm no-table alternative. Removing the table changes the configuration; it does not give the rotary-table build a 450 mm optical aperture. X/Z travel is 340/200 mm. Check the blank, chuck, tool holders and complete cut through the proposed surface profile.

The page describes an aerostatic spindle and rotary table, pneumatic chuck, fixed multiple-tool arrangement and closed-loop slide. Spindle position sensing is described, but a C axis is optional. Specify the actual positioning/indexing functions, tool-centre calibration and gripping sequence; do not assume a milling package or simultaneous multi-axis machining.

Published test material

Oxygen-free copper

Surface roughness reference

Ra ≤0.025 μm

Roundness reference

≤0.3 μm on a Ø50 mm copper workpiece

Published machine air pressure

0.6 MPa

These are different tests. Spindle/table axial and radial runout of ≤0.3 μm is a machine reference, not a guarantee of optical figure across your aperture. Agree material, tool, form measurement and release conditions for the actual mirror.

SQUARE: cutter sweep is not the workpiece envelope

The source describes air-bearing spindle and table arrangements, with oxygen-free copper and aluminium as example nonferrous workpiece materials. The SQUARE-200 column gives 200 mm X travel, 100 mm Z travel, 200 mm spindle-centre height above the table and Ø300 mm cutter rotation. Cutter sweep is not a Ø300 mm finished-part capacity.

For a flat surface, show the entire fixture, clamping points, stock allowance and tool entry/exit. Check the surface remains accessible at its furthest edge without fixture collision. For a prism, define how each face is indexed and referenced; the high-precision indexing table is optional.

Compare adjacent SQUARE sizes and added functions

SQUARE-80 lists X/Z 80/50 mm, spindle-centre height 80 mm and Ø90 mm cutter sweep. SQUARE-300 lists X/Z 400/200 mm, height 300 mm and Ø560 mm cutter sweep. These values belong to separate columns. The manufacturer offers a special CNC for nanometre-level motion, an indexing table for prisms, dedicated boring tools/fixtures and a fine-adjustment toolholder for turning. Enhanced turning/milling conversion and a nanometre-resolution interface are additional configurations. Motion resolution is not finished-surface accuracy.

The family's Ra 0.01 μm figure is a manufacturer surface reference. Define the measurement instrument, evaluation length/filter, substrate and machining conditions for acceptance; do not transfer that figure to hardened steel, glass or an arbitrary coating.

α-D14MiA: a FANUC machine and a separate service arrangement

Gongyan's original page says this series is a FANUC product supplied through its agency sales and service. Treat that as a dated catalogue description: ask for current model availability, the actual seller, serial/build revision and who commissions and supports it at the destination.

Published spindle speed is 100–10,000 rpm and rapid feed 48 m/min. The 1.4 s entry is tool-to-tool change time, not a complete chip-to-chip or accepted-part cycle. Trial the deepest hole, thread and milled feature with chip removal, indexing and inspection included. The reviewed catalogue image is marked by a D21MiA filename, so it is not used as a D14MiA photograph.

For an optical surface, put the site conditions in the offer

Agree tool setting, spare-tool strategy, chuck/fixture maintenance, parameters and software backups, operator training and metrology responsibility. Current utility and site requirements must come from the delivered build; do not design the installation from a family illustration.

Accept the optical surface on its drawing

1. Define what is measured

   Provide substrate grade/coating, geometry, clear aperture, datum scheme, form and roughness limits. Agree edge exclusions and how form, waviness and roughness are separated. A roundness result on a Ø50 mm copper testpiece does not establish spherical figure over a larger mirror.

2. Machine with the final support concept

   Use the intended chuck or fixture, real blank allowance and cutting tools. Test the difficult edge or slope, tool changes and repeated locating. Record machine/configuration, material, tool setting, air supply and thermal state.

3. Release, re-reference and inspect

   Agree the inspection setup before the cut. Check the surface after release where fixture distortion matters, with instrument calibration and analysis settings recorded. For prisms, inspect relationships between faces; for a drilled housing, inspect the hole/datum relationships instead of borrowing optical-finish criteria.

4. Time the usable result

   Include cleaning, loading, setting, cutting, release and inspection. Report rejects and repeatability across the agreed sample. Catalogue runout, rapid speed or motion resolution alone does not settle production output.

Separate the research company, machine builder and agent

The original company page identifies 北京工研精机股份有限公司 in Shunyi, Beijing, and describes precision/ultra-precision machine development and test laboratories. A Beijing government report dated 19 May 2025 records an official visit to the company, including workshops/laboratories. This supports company/site context; it does not certify a model's accuracy or a proposed order.

Use the exact legal seller and builder on the contract. Assign optical-process development, fixtures, metrology, machine acceptance, installation and warranty responsibility explicitly. For FANUC-supplied equipment, confirm the current agency/service arrangement separately from Gongyan's own ultra-precision range. General company capabilities and historical platform descriptions are not delivered-machine configuration records.