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Technical Bulletin TRM/95

To ensure best fit for Imation Dampening Sleeves or Imation Ductor Sleeves, use periphery tape to measure roller diameter. Periphery tape, accurate to one thousandth of an inch (0.001), is a measuring tool which directly converts circumference measurements to diameter. Periphery tape is available with increments in inches or millimeter. The Periphery tape described and illustrated here is in inch increments.

Periphery tape consists of two parts, tape body and vernier scale. Increments on the tape body represent fractions of an inch. Large numbers represent inches, smaller numbers represent tenths of an inch, ( .01 ) and the four smaller spaces within each tenth of an inch represent twenty five thousandths of an inch ( .025 ). The vernier scale represents thousandths of an inch (.001). Use a 3/8 inch wide and 1 - 7 inch diameter size tape for dampening and ductor sleeve roller measurement. Collins - Phillips Periphery Tape or equivalent is recommended.

How To Use

To accurately measure roller diameter:

1. Wrap periphery tape around roller so vernier scale is under body tape. Be sure tape is snug and square to roller. If tape sticks to roller, apply talcum powder to roller surface.

2. Record diameter reading.

3. Measure roller in three places, middle and ends.

Periphery Tape

Example 1: Vernier Index

A.	2.000 inch	First full inch value to the left of the vernier index
B.	0.100 inch	First tenth division to the left of the index
C.	0.050 inch	Two full .025 inch division to the left of the index
D.	0.007 inch	The .007 inch division on the vernier scale aligns perfectly with division line on body scale.
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Total	2.157 inch

Example 2: Vernier Index

A.	3.000 inch	First full inch value to the left of vernier index
B.	0.100 inch	First tenth division to the left of index
C.	0.075 inch	Three full 0.025 inch divisions to the left of index
D.	0.000 inch	Index zero aligns perfectly with body scale division
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Total	3.175 inch

Example 3: Vernier Index

A.	2.000 inch	First full inch value to the left of vernier index
B.	0.000 inch	No tenths division to the left of index
C.	0.025 inch	One full .025 inch division to the left of index
D.	0.015 inch	The 15 on vernier scale aligns perfectly with division on body scale
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Total	2.040 inch

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