Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p101
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 285966–288652

1: 2B001.a. does not apply to turning machines specially designed for producing contact lenses, having all of the following:
a. Machine controller limited to using ophthalmic based software for part programming data input; and
b. No vacuum chucking.

                Note 2: 2B001.a. does not apply to bar machines (Swissturn), limited to machining only bar feed thru, if maximum bar diameter is equal to or less than 42 mm and there is no capability of mounting chucks. Machines may have drilling or milling capabilities for machining parts with diameters less than 42 mm.

2. B. 001. b. Machine tools for milling having any of the following:
2. B. 001. b. 1. Three linear axes plus one rotary axis which can be coordinated simultaneously for "contouring control" having any of the following:
2. B. 001. b. 1. a. "Unidirectional positioning repeatability" equal to or less (better) than 0.9 µm along one or more linear axis with a travel length less than 1.0 m; or
b. "Unidirectional positioning repeatability" equal to or less (better) than 1.1 µm along one or more linear axis with a travel length equal to or greater than 1.0 m;
2. B. 001. b. 2. Five or more axes which can be coordinated simultaneously for "contouring control" having any of the following:
                  a. "Unidirectional positioning repeatability" equal to or less (better) than 0.9 µm along one or more linear axis with a travel length less than 1 m;
                  b. "Unidirectional positioning repeatability" equal to or less (better) than 1.4 µm along one or more linear axis with a travel length equal to or greater than 1 m and less than 4 m;
                  c. "Unidirectional positioning repeatability" equal to or less (better) than 6.0 µm along one or more linear axis with a travel length equal to or greater than 4 m; or
2. B. 001. b. 3. A "unidirectional positioning repeatability" for jig boring machines, equal to or less (better) than 1.1 µm along one or more linear axis; or
2. B. 001. b. 4. Fly cutting machines having all of the following:
a. Spindle "run‑out" and "camming" less (better) than 0.0004 mm TIR; and
b. Angular deviation of slide movement (yaw, pitch and roll) less (better) than 2 seconds of arc, TIR over 300 mm of travel;
2. B. 001. c. Machine tools for grinding having any of the following:
1. Having all of the following:
a. "Unidirectional positioning repeatability" equal to or less (better) than 1.1 µm along one or more linear axis; and
b. Three or four axes which can be coordinated simultaneously for "contouring control"; or
2. Five or more axes which can be coordinated simultaneously for "contouring control" having any of the following;
a. "Unidirectional