1、SMPTE 37M 94 m 8357403 O003567 8T3 m E- SMPTE STANDARD 1.02 mm f 0.040 in ANSI/SMPTE 37M-1994 Revision of ANSIISMPTE 37M-1987 O for Motion-Picture Equipment - CAUTION NOTICE: This Standard may be revised or withdrawn at any time. The procedures of the Standard Developer require that action be taken
2、to reaffirm, revise. or withdraw this standard no later than five years from the date of publication Purchasers of standards may receive current information on all standards by calling or writing the Standard Developer. Printed in USA. Raw Stock Cores Page 1 of 3 pages 1 Scope 3 Concentricity allowa
3、nce This standard specifies the recommended sizes and dimensions of raw stock cores for 8-, 16-, 35-, 65, and 70-mm motion-picture films. The concentricity of the inside and outside diameters of the core shall be as specified in figure 1. 4 Drive holes in 35-mm x 125-mm cores Cores of 35-mm x 125-mm
4、 shall have eight drive holes with dimensions and locations as shown in figure 2 and table 2. 2 Dimensions The dimensions of all cores shall be as given in figure 1 and table 1. Figure 1 - Core Copyright O 1994 by THE SOCIETY OF - American National Standard MOTION PICTURE AND TELEVISION ENGINEERS 59
5、5 W. Harisdale Ave., Whiie Plains. NY 10607 (91 4) 761 -1 1 O0 Approved May 12,1994 ANSI/SMPTE 37M-1994 Table 1 - Core dimensions - Dimension A Dimension B MiIlimeters) Inches Millimeters Inches Nominal size + 0.00 7.90 - 0.50 + 0.00 15.90 - 0.50 + 0.00 15.90 - 0.50 + 0.00 15.90 - 0.50 + 0.00 34.90
6、 1.00 + 0.00 34.90 - 1 .o0 + 0.00 34.90 - 1.00 + 0.00 34.90 - 1.00 + 0.00 64.90 - 1 ,o0 69.90 - 1 ,o0 + 0.00 + 0.000 0.311 - 0.020 50.00 0.50 8 mm x 50 mm (8 rnm x 2 in) 1.968 t 0.020 + 0.000 0.626 - 0.020 16 rnrn x 50 mm (16 mm x 2 in) 50.00 0.50 1.968 + 0.020 + 0.000 o.626 - 0.020 + 0.079 2953 -
7、0.039 16 rnm x 75 rnm (16 mrn x 3 in) 16 rnrn x 100 rnm (16 mrn x 4 in) + 0.000 0.626 - 0.020 100.00 1.50 3.937 + 0.059 35 rnrn x 50 rnrn (35 mm x 2 in) + 0.000 1.374 - 0.039 50.00 0.50 1.968 t 0.020 + 0.000 374 - 0.039 + 0.000 .374 - 0.039 35 rnrn x 75 rnrn (35 rnrn x 3 in) 35 rnrn x 100 mm (35 rnr
8、n x 4 in) + 0.079 2953 - 0.039 100.00 1.50 3.937 t 0.059 35 rnm x 125 mm2) (35 rnrn x 5 in) + 0.000 .374 - 0.039 125.00 1.00 4.921 t 0.039 + 0.000 2555 - 0.039 + 0.000 2752 - 0.039 65 mrn x 75 rnrn (65 rnrn x 3 in) 70 mrn x 75 rnrn (70 rnrn x 3 in) + 0.079 2953 - 0.039 + 0.079 2953 - 0.039 Dimension
9、s Millimeters Inches C + 0.016 0.000 + 0.035 l.161 - 0.000 D E + 0.40 + 0.016 3.80 - 0.00 - 0.000 dOTES ) Millimeter dimensions are primary. ) See clause 4. Page 2 of 3 pages SMPTE 37M 94 m 8357401 000L5b 676 m ANSI/SMPTE 37M-1994 Detail of Drive holes (8 places) Figure 2 - Drive holes in 35-mm x 12
10、5-mm core Table 2 - Drive hole dimensions Dimensions Millimeters Inches F 10.00 * 0.50 0.394 t 0.020 G 35.00 T 0.50 1.378 2 0.020 H 14.60 * 0.50 0.575 * 0.020 J 22.5“ 22.5“ IK 45“ 45“ Annex A (informative) Additional data Means of attaching film to all cores are optional The keyway is provided as a
11、means of driving the core for take-up or of providing holdback tension on a feed spindle. The dimensions of the keyway shall be adequate to clear a square-ended key. The maximum value for dimension A has been fixed inten- tionally to encourage a common manufacturing practice of keeping the maximum w
12、idths of cores very slightly less than the minimum widths of corresponding films. The rather large tolerances on dimension 6 are necessary to encompass the satisfactory existing practices of many different manufacturers. It is expected, however, that cores O made by any one manufacturer would be hel
13、d to a consid- erably smaller tolerance range. This will help prevent large variations, including undue tapering of the core from one side to the other, of any manufacturers product. In the interest of standardization, it is recommended that future cores with diameters greater than 100 mm (4 in) be
14、designed to even-millimeter (nominal inch) dimensions, such as 125, 150, 175 millimeters, etc. Cores with keys (so-called male cores) have not been in- cluded in this standard because they are in declining use. Therefore, new equipment should be designed to accept the female core (core with keyway). Page 3 of 3 pages
