1964_IMPORT_AND_EXPORT_(STRATEGIC_COMMODITIES)_REGULATIONS — Page 17

1988 Ed.]

Import and Export (Strategic Commodities) Regulations

[CAP. 60

G 17

[Subsidiary]

Technical Note:

Positioning accuracy is that accuracy which would be obtained in a temperature-controlled environment of 20°C±2°C with any mechanical compensation techniques shipped with the machine or any electronic compensation described in sub-item (a)(iv). Positioning accuracy of machines shipped without numerical control units will be that attained with a control unit used during checkout of the machine and with feedback systems identical to those that will be used with the machine, or by accuracy previously obtained with an identical machine and feedback system and control unit which will be connected to the machine. (See Technical Note 6.)

(ii) Jig grinders having all of the following characteristics:

(1) Overall positioning accuracy in any axis equal to or greater (coarser) than:

(a) ±0.005 mm for machines with total length of axis travel equal to or less than 300 mm;

(b) (0.005+(0.002/300) (L-300)) for machines with total length of axis travel, L, greater than 300 mm;

(2) Not more than two axes capable of simultaneously coordinated contouring motion;

(iii) Machine-tools (other than boring mills, milling machines and machining centres and jig grinders described in (i) and (ii) above and dimensional-inspection machines described in (A) below), having all of the following characteristics-

(1) Radial-axis motion measured at the spindle axis equal to or greater than 0.0008 mm TIR (peak-to-peak) in one revolution of the spindle (for lathes, turning machines, contour grinding machines, etc.);

(2) Meeting the requirements of (i)(1)(a), (i)(6) and (i)(7) above;

(iv) Dimensional inspection machines, having all of the following characteristics:

(1) A linear positioning accuracy equal to or worse than:

(a) ±(3+L/300) micrometre for L shorter than or equal to 300 mm;

(b) 14 micrometre for L longer than 300 mm;

(2) A rotary accuracy of equal to or worse than 5 second in every 90 degrees; and

(3) Meeting the requirements of (i)(1) above;

(For high precision turning machinery, see also Item IL 1370.)

(c) "Direct numerical control systems" (DNC) consisting of a dedicated stored programme computer acting as a host computer and controlling, on-line or off-line, one or more numerically controlled machine-tools or inspection machines, as defined in sub-item (b) above, related "software", and interface and communication equipment for data transfer between the host computer memory, the interpolation functions, and the numerically controlled machine-tools;

(d) Specially designed sub-assemblies and software which according to the manufacturer's technical specifications, can upgrade the capabilities of numerical control units and machine-tools either so that they would become embargoed by sub-items (a), (b) or (c) above, or so that they would cease to be eligible for consideration for export at national discretion.

Note:

Specially designed printed circuit board sub-assemblies are embargoed by this sub-item.

(For machine-tool parts and components, see also Item IL 1093.)

Technical Notes:

1.

2.

"Numerical control" is defined as the "automatic control of a process performed by a device that makes use of numeric data usually introduced as the operation is in progress" (Ref. ISO 2382).

"Contouring control" is defined as: "two or more numerically controlled motions operating in accordance with instructions that specify the next required position and the required feed rates to that position. These feed rates are varied in relation to each other so that a desired contour is generated" (Ref. ISO/DIS 2806).