Quoting a 3+1 Axis CNC End Milling Machine
Ask for an axis diagram and trial on the most difficult transom joint before comparing an aluminum window end milling machine quotation.
Specify what the additional axis must do
Ask the vendor to name the axis, show its direction and explain whether it indexes between operations or moves during cutting. The phrase 3+1 by itself does not establish tool access to a specific shoulder or angled end. Provide a section with each machined face marked and ask the vendor to identify the cutter approach.
Compare the tooling package
Request line items for the approved cutters, holders, locators, guards and software used in the demo. Show both left and right versions of the joint. Ask how the machine returns to a proven stop position when switching profiles and how a revised contour is saved. Put optional tooling in the scope comparison rather than assuming the quoted machine includes it.
Tie the quotation to a sample trial
Use a wide section, the least accessible end and a recurring standard profile. Check contour depth, bearing surfaces and fit against the mating extrusion. Measure time from one accepted profile to the first accepted part of the next profile. Record the setup used in the quote so the factory acceptance test can repeat it.
What to record before production release
In the RFQ, require a feature-to-tool matrix with three fields for every joint: tool approach, fixture orientation and included tooling. Ask for a signed exception list covering features demonstrated with optional equipment or left for a separate station.
Related equipment and reading
Send your drawings or samples for review.
Technical reference
Fom Industrie MISTRAL technical sheet. An example of separate angle, profile-stop, vice and cutter specifications.