SHEET METAL / PRACTICAL MANUFACTURING GUIDE
Sheet metal design: beyond the flat pattern
A cut profile is only part of a formed component. Connect the material, bends, hardware and finish to the finished shape and installation requirements.
Define the finished component
Provide folded geometry or a drawing showing bend directions, angles and the dimensions that control installation. State material grade and thickness. Identify mating parts and assembly clearances where necessary. The finished part is the acceptance basis, even when a flat profile is supplied for cutting.
Clarify the flat-pattern assumptions
Bend allowance and tooling need to suit the chosen material and manufacturing method. If a customer-supplied flat pattern must be used, state that requirement and provide the finished geometry too. The production resource should confirm compatibility before files are released, rather than silently changing the intended part.
Review features near bends
Holes, slots, short flanges and other details close to a bend can affect forming and access. Identify features that control installation so that any proposed adjustment can be evaluated. Review the actual part with the selected manufacturing resource; a generic minimum distance is not appropriate for every material and tool setup.
Include hardware and joining
Specify inserts, studs, fasteners and any joining work. Explain which items are supplied, which must be sourced and how the assembly should fit. Cutting, forming, hardware and joining need a coordinated sequence. An enquiry for the cut profile alone may omit work required for the usable component.
Describe surfaces and coating
Mark visible faces, brushed or grain direction where relevant, edge condition and finish requirements. Identify masked threads, contacts or locating surfaces. Agree the sequence of hardware and finishing, plus the final inspection stage. A coating can affect both appearance and the fit of an interface.
Prepare one consistent order
Use matching drawing, model and flat-pattern revisions with quantities by part. Include inspection records, packing requirements, destination and target date. Any change to thickness, material, bends or hardware should be reviewed against the assembled component and approved before manufacture.