Question 1

When should I choose mill-turn instead of separate turning + milling?

Accepted Answer

Choose mill-turn when the part has milled features (flats, cross-holes, ports, keyways) that must stay tightly related to the turning axis, or when removing secondary setups reduces cost and risk. If the milled features are simple and non-critical, separate processes can sometimes be cheaper.

Question 2

What tolerances are realistic for mill-turn parts?

Accepted Answer

Realistic tolerances depend on feature type and size. Non-critical dimensions are often best left at general tolerances. For functional fits, we focus on the specific features that matter (runout, bore/shaft fits, and feature position to the axis) and build the process + inspection plan around those CTQs.

Question 3

Does live tooling reduce lead time?

Accepted Answer

It can. Live tooling often removes an entire secondary operation, which reduces queue time, handling, and inspection steps. The real benefit shows up when the part can be completed in one run (especially with a sub-spindle).

Question 4

Do you support back-side machining in the same cycle?

Accepted Answer

When the part and machine configuration support it, a sub-spindle can complete the back side without a flip. This improves face-to-axis control and reduces tolerance stack-up.

Question 5

What do you need to quote a mill-turn part correctly?

Accepted Answer

A 3D model plus a 2D drawing with datums, CTQ callouts, thread specs, and any clocking/angle requirements. If you need inspection reporting (FAI/control plan), include that in the RFQ.

Question 6

How should I specify clocking (angular orientation)?

Accepted Answer

Only specify it when function requires it. Use a clear datum feature (flat, keyway, or hole pattern) and define the angular relationship to the primary axis. Avoid unnecessary angle callouts—they add cost.

Complex Parts,One Setup

Complex Parts,One Setup