Welding positioners and rotators: what the load rating does not settle

Koike's positioner guidance explains that selection depends on the workpiece's size and shape as well as weight. Its examples relate capacity to the centre of gravity and distinguish tilt and rotation loading.

The commercial implication is simple: "rated for X tonnes" can be too broad if the original rating includes conditions. Copy the capacity plate clearly and supply the matching documentation. Do not remove the qualifying information to make a shorter advert.

A buyer's proposed workpiece may differ substantially from the one last used. The seller should provide equipment evidence and refer application questions to the manufacturer or a competent engineer. A sale catalogue is not the place to calculate a new permitted load.

Prepare the following information for each proposed lot:

1. Identity and documents: Record manufacturer, full model, serial number, plate photographs and the manual reference.
2. Documented rating: Transcribe the value, units and stated conditions together. Mark unreadable or missing information.
3. Offered configuration: List the table, chuck or fixture, controller, pendant, linked units and other included equipment.
4. Known changes: Identify replaced controls, modified bases or other alterations, with supporting records.
5. Observed condition: Record dated observations, service history and known faults separately from original specifications.
6. Unanswered questions: Name the point, who will answer it and whether it affects the proposed sale description.

Those headings can form one page. The underlying evidence should remain accessible rather than being compressed into a general "tested" claim.

Useful questions for the manufacturer include: Which capacity document applies to this serial number? What conditions belong to the stated rating? Does the present configuration match the documented one? What information would you need to assess a buyer's proposed application?

For rotators, add: Which units make up the rated set? Which controls or linking equipment belong with it? Do the available records describe the units now offered? These questions avoid assuming that a rating on one component describes every possible arrangement.

An identified positioner and its documented controls can be easier to assess as a package. If the controller belongs to a larger cell, a separate sale may require an integrator's advice before anyone calls the positioner standalone.

The robotic welding cell guide covers that system boundary. Do not allocate the same controller to both the robot-cell lot and the positioner lot.

A customer-specific fixture can create a different problem. Its presence on the table does not establish that the seller can include it. Use the welding fixture ownership register to record authority and any drawing restrictions.

If the fixture is excluded, show or state the exclusion clearly. A buyer looking at the photograph needs to understand whether it is assessing a bare table, a chuck-equipped package or a production fixture arrangement.

An authorised demonstration may show rotation or tilt under recorded conditions. It does not establish suitability for every load within a headline weight figure.

Agree a brief through the fabrication demonstration guide and leave technical assessment to a competent person. There is no need to mount a new workpiece simply to improve a sales photograph.

For installed equipment, the foundation and anchoring questions help define the contractor enquiry. The manufacturer or contractor should determine the removal method and any reinstatement scope.

Send the rating-context sheet and proposed inclusions to UK Auction Group's manufacturing asset service. That provides a definite package for discussion. The fabrication and welding hub connects the surrounding equipment guides.