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Resources: the reference material we use ourselves

Tolerance tables, material comparisons, forming windows and export terms — written by the people who run the machines, not by a marketing department.

Start here

Three pages answer most first questions

Technical guides

Forty guides, each on one decision

Each runs roughly 1,000–1,800 words with the tables we actually work from. Seven are listed here; the index has all forty.

Acrylic, PC, PS, PETG or glass?

Five transparent materials on seven dimensions, plus cast versus extruded sheet and the eight application cases that settle the choice.

Material selection

How tight should the tolerance be?

Three tolerance bands for three situations, achievable values by size range, and why acrylic is not metal under heat.

Tolerance guide

How thick does the panel need to be?

Span, load and edge support decide thickness. Tables by support condition, plus ribs versus extra millimetres.

Thickness guide

Why bent acrylic goes white or bubbles

The forming window, pre-drying for thick sheet, four sources of trapped bubbles, minimum bend radius by thickness.

Heat bending

Stopping chips and cracks at the router

Feed rate, spindle speed, tool geometry, workholding — and the part-design changes that have to go with them.

Machining defects

Instrument panel precision: how far to push

Five critical dimensions and the tolerance each really needs, plus four ways to interface with sheet metal at ±0.5 mm.

Panel precision

Machine guard: acrylic or polycarbonate?

Four guard types, thickness by position, the fogging problem, and why you cannot tap threads directly into acrylic.

Guard material choice

All 40 guides, indexed

The full list with abstracts, word counts and reading times, if you would rather browse than jump.

Technical index

Before you order: drawing checklist

What a drawing needs to contain for a quotation to be accurate the first time — views, tolerances, finish, material grade, quantity break.

Ordering checklist

Reference tables

Numbers you can quote internally

Tolerance at a glance

General fabrication ±0.3 mm · production parts ±0.2 mm · CNC and laser features ±0.1 mm. Tight limits need an agreed reference temperature.

Lead time at a glance

Samples 3–7 business days · standard production 7–15 business days · larger or highly complex jobs scheduled against the drawing. Every batch is filmed before packing, and the shipment is held until you confirm the video.

Sheet sizes we stock

Cast sheet 2–50 mm, standard 1220×2440 mm and 2050×3050 mm. Larger assemblies are produced by bonding, with the joint line agreed on the drawing.

Colour tolerance

ΔE ≤ 2 under D65 against a retained master swatch; ΔE ≤ 1.5 when the buyer also holds a swatch. Measured per batch, not per shipment pair.

Forming window

150–170 °C for line bending. Thick sheet is pre-dried because moisture is the main cause of bubbles and white haze at the bend.

Packing standard

Foam interleave, corner protection, double-wall carton, pallet and shrink wrap for sea freight. Neutral packing available on request.

Cannot find the answer?

Send the question with a sketch or drawing. If it is a real technical question we will answer it whether or not it turns into an order.

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