Selection guide
How to Choose a Busbar Punching, Shearing and Bending Machine
Choose a copper busbar machine by operation-specific capacity, hole tooling, bend geometry and handling. Compare WM-9400 configurations and plan a sample trial.
Technically reviewed by: Lao Xiaoyu (劳晓宇) · Senior Engineer
Content updated:
Review confirmed:
Choose a busbar processing machine against the most demanding operation on the finished drawing. A bar can fit the bending station and still exceed the shear capacity, require a different punch, or collide with the tooling after its first bend.
Our WM-9400 three-workstation busbar machine combines punching, shearing and CNC-controlled bending. This guide explains how to narrow the configuration before using our sample-trial acceptance checklist.
Identify the material and the job
Rigid copper bars and insulated flexible copper connections need different preparation steps. For holes, cut ends and bends in rigid bar, start with the busbar processing range. For removing insulation from flexible copper connections, review our WM-195 busbar peeling machine.
Provide the bar dimensions as width × thickness in mm. Cable cross-sectional area in mm² does not describe the rectangular shape a punch, shear or bending tool must accommodate.
| Drawing input | What we check |
|---|---|
| Copper grade, temper and any coating | Material compatibility, bend trial and surface requirements |
| Width, thickness and starting length | Station capacity and support during handling |
| Hole diameter, slots, positions and edge distances | Punch/die combination and access to every hole |
| Bend direction, angle, inside radius and spacing | Tool shape, forming capacity and clearance around earlier bends |
| Finished dimensions and tolerances | Measurement method and trial acceptance |
| Part quantity and mix | Loading time, tool changes and repeat-job setup |
Copper temper and thickness affect the radius that can be formed successfully. The Copper Development Association discusses these relationships in Copper for Busbars, section 1.2.2.2.7. Use the specified material condition and drawing radius when arranging a trial; a generic radius rule cannot establish a particular machine’s capability.
Compare each station separately
The WM-9400 has three capacity configurations. These selected figures come from our published specification:
| Configuration | Maximum shearing size, width × thickness | Specified punch diameter range |
|---|---|---|
| 160 mm | 160 × 12 mm | Ø4.3–32 mm |
| 260 mm | 260 × 16 mm | Confirmed on the quote |
| 300 mm | 300 × 20 mm | Ø4.3–25 mm |
Two comparisons matter. First, the 160 mm configuration’s 12 mm shear thickness differs from its 16 mm punching and flat-bending thickness limits. Second, the 300 mm configuration has greater punching force but a smaller stated maximum hole diameter than the 160 mm version. Selecting the largest machine does not settle the tool choice.
Where width and thickness are listed as separate maxima, we confirm the combined working size. Likewise, the smallest specified hole diameter is not a promise that this hole can be punched through the maximum bar thickness. Material, hole size and tooling must be checked together.
Show the bend direction and the complete part
Mark flat bends, edgewise bends and offsets on the drawing. A flat-bending capacity cannot be applied to an edgewise bend. Include the short legs and distances between bends: a part that fits the first operation may have restricted access at the next one.
We review the intended sequence using the complete part outline. Punching before bending may preserve access, while some geometries need another sequence or tool arrangement. Approve the sequence after checking both intermediate clearance and the final dimensions.
Measure the work cycle you will actually run
On the WM-9400, the operator loads, supports and repositions the bar. Assess output using a complete cycle that includes station transfers, tool changes where required, unloading and inspection. Record changeover time separately when comparing mixed batches.
The product video shows punching, end-corner rounding and bending. Corner-rounding tooling is confirmed on the quote. The video does not establish shearing capacity, dimensional accuracy or a production rate for your drawing.
Move from a shortlist to a confirmed configuration
Send a dimensioned drawing, material details and target quantity through our sample-trial inquiry. We match the configuration and tools, agree acceptance checks and record your actual material being processed. Leave your email and our engineering and sales team will contact you within 12 hours with a quotation proposal.
Use the busbar defect guide to identify which surfaces and dimensions deserve particular attention during that trial.
See the process in action
Demonstrations from the machines referenced in this guide. Click to watch the operation, then request a trial with your own material.
Questions engineers ask
What information is needed to choose a busbar processing machine?
Send the material grade and temper, bar width and thickness, finished drawing, hole diameters and positions, bend directions and radii, tolerances and production quantity. We check each operation and the handling sequence before selecting a capacity configuration and tool set.
Does CNC busbar bending mean automatic feeding?
On our WM-9400, the operator loads, supports and repositions the bar between stations. CNC-controlled bending does not establish automatic feeding or transfer. We demonstrate the complete working cycle for your part.
Can the 160 mm WM-9400 configuration shear a 16 mm thick bar?
Its stated maximum shearing size is 160 × 12 mm. The 16 mm thickness limit applies to punching and flat bending, with the combined width and thickness checked for the intended operation. For thicker shearing, we review the 260 or 300 mm configuration against your drawing.
Can the copper capacity also be used for aluminium busbars?
We confirm aluminium grade, temper, dimensions and tooling separately on the quote. The published copper configuration is not an automatic aluminium capacity guarantee. Send the actual material for a trial.