Plate rolls: describe capacity with the material conditions attached
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"Rolls 10 mm plate" leaves too much unsaid. A plate roll's useful capacity depends on the material, working width and required bend, and the quoted pre-bending capacity may differ from its rolling capacity. A sale description should preserve those conditions.
The aim is to let a buyer compare the machine with a proposed job. You do not need to calculate a new capacity for an unfamiliar grade of steel. You need the correct specification, the machine's identity and a clear account of any gaps.
Why two capacity figures can both be right
Rolling capacity concerns forming the plate to a stated curvature under specified conditions. Pre-bending concerns forming the ends, where an otherwise unformed flat portion can remain. Manufacturers may therefore publish separate figures for these functions.
Bendmak's plate-roll buying guide discusses material strength, plate width, required diameter and the distinction between bending and pre-bending capacity. These are reasons to read a specification as a set of conditions. They are not a formula for extending a machine's rating to another job.
A brochure figure for a specified material at full working width should stay attached to that material and width in the sale listing. If the document also gives a different figure at a shorter width, retain the distinction. Do not select the larger thickness and discard the condition that explains it.
The same care applies to guillotine capacity descriptions. In a workshop with both machines, copying a common material assumption across every lot can create a misleading catalogue.
Transcribe the specification without losing the small print
Use the original manual or a manufacturer document matched to the model and serial range. Record the document's date or revision if available.
| Field | What to copy or establish | If the answer is missing |
|---|---|---|
| Machine identity | Manufacturer, exact model, serial number and stated year | Photograph the plate and request identification |
| Working width | Rated usable width and its unit | Leave it unconfirmed rather than estimate from a photograph |
| Material condition | Grade or strength assumption used in the rating | Ask the manufacturer to explain the applicable rating |
| Rolling capacity | Thickness with the associated width and diameter conditions | Quote only the supported part |
| Pre-bending capacity | Separate figure and its conditions, where supplied | Do not substitute the rolling figure |
| Diameter information | Relevant rated diameter or capacity-table reference | Avoid promising a buyer's finished diameter |
| Roll arrangement | Number of rolls and identified model configuration | Use documented terminology |
| Accessories | Supports, controls and attachments actually included | Mark missing, retained or unconfirmed items |
Keep units consistent. If the manufacturer's sheet uses a different unit system from the sale listing, preserve the original alongside any checked conversion. Rounded figures can matter when the buyer is comparing a borderline job.
What the machine includes still matters
A machine with the right nominal capacity may be a poor fit if the buyer needs an accessory that is absent. Record the control unit and any documented side or overhead support arrangements. State whether accessories in old workshop photographs remain with the machine.
Describe visible wear and known faults without diagnosing them from appearance. A surface mark, a reported control fault and a specialist's assessment are different kinds of evidence. Attribute each plainly.
For a demonstration, agree the material and observation in advance. The demonstration planning guide explains how to describe what was observed without turning one trial into a general performance guarantee. A photograph of a finished cylinder from years ago does not establish present condition.
Compare the job before comparing the price
A prospective buyer may also consider a press brake or a tube bender, but those machines answer different forming needs. The stock shape, required geometry and production method belong in that comparison. Avoid describing every bending machine as a substitute for every other one.
For a valuation enquiry, give UK Auction Group the complete capacity page, machine photographs and included-accessory list. A short, qualified description is more useful than an impressive thickness figure with its conditions missing.
The fabrication and welding guide covers other forming and cutting equipment.
Sources
This guide gives general information. Equipment-specific, legal, tax and safety decisions may need a qualified adviser or competent specialist. The guides do not promise sale prices, fees or results.