Start with the application and material form
Acrylic, also called PMMA, is used where a part needs a rigid plastic form and may need light transmission. The finished result depends on the stock, geometry, machining, handling and any post-processing. State the intended use, material form and any required grade so the quotation is based on the right specification.
Design for machining access
Review wall thickness, unsupported spans, hole spacing, slots and internal corners. Thin sections and small edge distances can be sensitive to the part geometry and workholding. Dimension critical holes and interfaces from clear datums, and identify surfaces that must remain visible or mate with another component.
Set appearance expectations clearly
A machined acrylic face should not automatically be described as optically clear. If transparency, gloss or a particular edge appearance matters, call out the viewing surfaces and the required finish. Discuss polishing or other secondary work as a separate requirement so it can be reviewed for the part.
Send a complete drawing package
Include a 2D drawing and 3D model when available, plus material, quantity, critical dimensions, finish and inspection needs. A useful comparison page is à usiner des pièces en PMMA. For broader plastic part questions, see our CNC plastic materials information and Fraisage CNC process page.