16-mm sound motion pictures, a manual for the professional and the amateur (1949-55)
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106
V. DIMENSIONS AND STANDARDS
American Standard Cutting and Perforating Dimensions for
16-Millimeter Silent Motion Picture
Negative and Positive Row Stock
172 J1947 Revision of
Dim.n.ion,
Inches
Millimeters
A
0.629 ± 0.001
15.98 =0.03'
t>*
0.3000 0.0005
7.620 * 0.013
C
0.0720 = 0.0004
1.83 =0.01
D
0.0500 ± 0.0004
1.27 =0.01
tE
0.036 * 0.002
0.91 =0.05
to
Not > 0.001
Not > 0.025
tl
0.413 * 0.001
10.490 * 0.025
14
30.00 ± 0.03
762.00 =0.76
R
0.010
0.25
These dimensions ond tolerances apply to the material
cutting and perforating.
•In any group of (our consecutive perforation!, the maximum difference of
pitch shall not exceed 0.001 inch and should be as much smaller as possible
(This requirement has been added to the previous standard Z22. 5-1941.) fThis dimension and tolerance was given in respect to the center line of the
perforations in the previous standard Z22. 5-1941. JThu dimension represents the length of any 100 consecutive perforation
intervals.
July 16, 1947, by the American Standard! Anociotion, Society of Motion Picture Engine**.
Appendix
The dimensions given in this standard represent the practice of film manufacturers in that the dimensions and tolerances are for film immediately after perforation. The punches and dies themselves are made to tolerances considerably smaller than those given, but owing to the fact that film is a plastic material, the dimensions of the slit and perforated film never agree exactly with the dimensions of the punches ond dies. Shrinkage of the fiilm, due to change in moisture content or loss of residual solvents, invariably results in a change in these dimensions during the life of the film. This change is generally uniform throughout the roll.
The uniformity of perforation is one of the most important of the variables affecting steadiness of projection.
Variations in pitch from roll to roll are of little significance compared to variations from one sprocket hole to the next. Actually, it is the maximum variation from one sprocket hole to the next within ony small group tjtat is important. This is one of the reasons for the method of specifying uniformity in dimension B.
Figure 8
American Standard Cutting and Perforating Dimensions for
16-Millimeter Sound Motion Picture
Negative and Positive Raw Stock
Z22.11-.94J
Revision ef
MJ.IJ.ie.l
Pago I of 2 pog.i
Dimension,
Inches
Millimeters
A
0.629 ± 0.001
15.98 =0.03
tB*
0.3000 ± 0.0005
7.620 = 0.013
C
0.0720 = 0.0004
1.83 =0.01
D
0.0500 ± 0.0004
1.27 =0.01
tE
0.036 * 0.002
0.91 =0.05
4
30.00 ± 0.03
762.00 = 0.76
R
0.010
0.25
These dimensions and tolerances apply to the moteriol immediately after
cutting and perforating.
*ln any group of four consecutive perforations, the maximum difference of
pitch shall not exceed 0.001 inch and should be as much smaller as possible.
(This requirement has been odded to the previous standard Z22. 12-1 941 .) fThis dimension and tolerance was given in respect to the center line of the
perforations in the previous standard Z22. 12-1941. fThis dimension represents the length of any 100 consecutive perforation
intervals.
Approved July 16, 1947, by tht AȣilCon Standard! Aiiociatic Spamor: Society of Motion Picture Engineers.
Appendix
The dimensions given in this standard represent the practice of film manufacturers in that the dimensions and tolerances ore for film immediately after perforation. The punches and dies themselves are made to tolerances considerably smaller than those given, but owing to the fact that film is a plastic material, the dimensions of the slit and perforated film never agree exactly with the dimensions of the punches and dies. Shrinkage of the film, due to change in moisture content or loss of residual solvents, invariably results in a change in these dimensions during the life of the film. This change is generally uniform throughout the roll.
The uniformity of perforation is one of the most important of the variables affecting steadiness of projection.
Variations in pitch from roll to roll are of little significance compared to variations from one sprocket hole to the next. Actually, it is the maximum variation from one sprocket hole to the next within any small group that is important. This is one of the reasons for the method of specifying uniformity in dimension B.
Figure 9