SMPTE ST 174-1994 Motion-Picture Equipment (16-mm) - Camera Spools - 50- to 400-ft Capacity.pdf

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1、SMPTE 374 94 W 8357403 OOOL58b 755 1 Scope SMPTE STANDARD ANSI/SMPTE 174-1 994 Revision of ANSIISMPTE 174-1900 for Motion-Picture Equipment (1 6-mm) - Camera Spools - 50- to 400-Ft Capacity 1.1 This standard specifies the dimensions for 16-rnm motion-picture camera spools having capacities from 50 f

2、t to 400 ft (15 m to 120 m) of film. 1.2 This standard further specifies the configu- ration of the positioning of the spindle holes in the two flanges. These shall be identified as styles 1, 2, and 3 (see figure 2). Page 1 of 3 pages 2 Dimensions The dimensions shall be as specified in the figures

3、and tables. 3 Spindle hole alignment In styles 2 and 3, the alignment of the sides of the squares in the two flanges shall be such that a test bar 0.316 in (8.03 mrn) square may be passed com- pletely through the spool. The corner keyways in the two flanges of style 2 shall be aligned with each othe

4、r. SECTIONAL VIEW VOLUME Cf ROTATION DIAGRAM Figure 1 - Camera spool CAUTION NOTICE: This Standard may be revised or withdrawn at any time. The procedures of the Standard Developer require that action be taken lo reaffirm. revise, or withdraw this standard no later than five years from the date of p

5、ublication. Purchasers of standards may receive current informalion on all standards by calling or writing the Standard Developer. Printed in USA. Copyright 0 1994 by THE SOCIETY OF American National Slandard MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Harisdale Ave., White Plains, NY 10607 (914)

6、 761-1100 Approved April 13, 1994 SflPTE 374 94 = 8357401 0003587 691 = ANSI/SMPTE 174-1 994 REAR FLANGE FRONT FLANGE* STYLE 2 O STYLE 3 TAl * THE FRONT FLANGE IS THE ONE THAT FIRST ENGAGES THE CAMERA SPINOLE. HOLES ARE ORIENTED AS SEEN BY LOOKING ATOUTER SURFACE OF EACH FLANGE SEPARATELY. Figure 2

7、- Flanges Table 1 - Nominal spool capacity Meters Inches Millimeters 15 1.26 I 0.02 32.0 0.5 30 1.26 f 0.02 32.0 0.5 200 60 1.26 f 0.02 32.0 0.5 400 120 2.12 f 0.02 53.8 0.5 K 50 15 1 O0 30 200 60 400 120 lM 50 1 O0 15 30 200 60 1.00 min 1.00 min 1.00 min 1.50 min + 0.00 281 - 0.04 + 0.00 362 - 0.04

8、 + 0.00 496 - 0.04 25.4 min 25.4 min 25.4 min 38.1 min + 0.0 + 0.0 71.4 - 1.0 91.9 - 1.0 + 0.00 + 0.0 400 120 665 - 0.04 168.9 - 1.0 Page 2 of 3 pages 4 SUPTE 374 74 8357403 0001588 528 ANSVSMPTE 174-1994 Table 2 - Dimensions common to spools in table 1 Dimensions Inches Millimeters + 0.04 + 1.0 - 0

9、.00 7.6 - 0.0 A Keyway depth + 0.02 + 0.5 - 0.00 3.0 - 0.0 8.05 - 0.00 - 0.000 *.O5 - 0.00 - 0.00 o.8 - 0.0 HI At periphery - 0.000 16.05 - 0.00 B Keyway width C D Spindle hole diameter F Film slot (see 4.1) 0.006 + 0.15 0.317 : 0.000 Side of square spindle hole + 0.006 + 0.15 + 0.03 + 0.8 + 0.014 +

10、 0.36 H2 Distance between flanges at spindle holes 0.630 min 16.00 min + 0.00 + 0.0 J Overall thickness at spindle holes - 0.02 18.5 - 0.5 P (See note 5) 0.020 max 0.51 max Specifications 4.1 Dimension F represents a slot in the spool core for attaching film. Its sides shall be straight, parallel, a

11、nd 0.028 in to 0.059 in (0.71 mm to 1.50 mm) apart. It is permissible for the slot sides to diverge in the center portion of the slot. Any divergence shall not be greater than one- half the width of the slot. 4.2 Dimension J is the thickness of the spool within the K-diameter zone, which is centered

12、 on the spindle hole axis of each flange. 4.3 The eccentricity of the core with respect to the spindle hole axis shall not exceed a total radius variation (total indicator reading) of 0.030 in (0.76 mm) for all spool sizes. NOTES 1 The style 2 configuration of spindle holes is recom- mended as the p

13、referred standard for future design. 2 Flanges shall be opaque and their inner surfaces shall have a low-reflectance characteristic. 3 If the spool or spool hub is made from plastic or other dimensionally unstable material, spindle hole dimensions C and D shall be adjusted so that at least the minim

14、um dimension is maintained throughout the normal use range of temperature and humidity. 4 Rivet heads or other fastening devices, which extend beyond the outer surface of the flange, shall lie outside the K-diameter zone but within the boundaries defined by the volume of rotation diagram (Le., 0.770

15、 in t19.56 mm max). 5 A reference plane of rotation for each flange is defined by a plane perpendicular to the axis of the spindle and coinci- dent with the surface of a flat 0.590 in (14.99 mm) diameter support in contact with the flange and centered on the spindle hole axis of the flange. Dimensio

16、n P is the distance measured outwardly from this reference plane of rotation to the farthest plane of rotation generated by any point on the flange outside the K-diameter zone when the spool is rotated on an accurate, tight-fitting spindle. 6 The maximum effective thickness of spools (including all

17、the characteristics mentioned in note 5) outside the K-diameter zone has not been stated because it is afunction of a spools specific J value between the 0.590-in (14.99- mm) diameter reference zones on each flange. The largest such overall effective thickness, however, will be J max + 2P max = 0.770 in (19.56 mm). 7 There may be other cutouts or holes in the hub area of the flanges within the limits of dimension K, provided the spool remains nominally in dynamic balance. Page 3 of 3 pages