Pi Tape® Diameter Measuring Tapes

specials         how to read

The periphery tape or Pi Tape® gage, provides a quick, accurate and easy method of reading true diameters of both round and out-of-round forms.

• Perfect for measurement of thin or soft walled parts - large or small.
  
  
• Pi Tape gages consist of a narrow metal ribbon bearing special graduations.
  These graduations are designed to convert circumferential distance into diameter measurement so the observer can read the diameter directly from the scale.
  
  
• Tapes are checked over master gages at .001'"(.03mm) accuracy for standard tapes up to 144" (3600mm).
  Certificate of accuracy traceable to National Institute of Standards and Technology is furnished.
  
  
• Pi Tape gages are a precision tool made of 1095 clock spring steel (on request 420 stainless steel - for use in a corrosive atmosphere).
  They require a minimum of maintenance, but we do recommend a quick wipe with an oil moistened cloth after use. A light gun oil works very well.
  
  

Make sure the tape has not been dented or kinked. This may affect the accuracy of the tape.

Pi Tape gages are invaluable tools to the aero-space field as well as the plastic pipe industry. The variety of uses are infinite.

SPECIAL DESIGN TAPES CAN BE MADE TO YOUR REQUIREMENTS

• Extra Graduations
  
  
• Longer tapes (Reels available for many sizes)
  
  
• Wider or Narrower tapes
  
  
• Tapes calibrated for direct reading of inside diameters
  
  
• Tapes with Go and No Go Calibrations for inspection or production departments
  
  
• Stainless steel Pi Tape gages - diameters up to 108", the following width:
  1/4" Gage Member 1/2" Body
  
  
• EZ Read tapes - white lettering, blue background.
  
  
• Special design tapes are not returnable.
  
  

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To Read Outside Diameter Metric Tapes

EXAMPLE

Each line on the Gage Member of the tape represents .5mm of diameter, while each line on the Vernier represents .01 mm. The zero on the Vernier is past the 661.5 line on the Gage Member of the tape. Now find the line on the Vernier which corresponds exactly with the line above. The example shows it to be the 23 line which equals .23mm. This added to the 661.5 reading gives an outside diameter of 661.73mm.

When using standard O.D. tape on an I.D. surface, add double the tape thickness to the reading to arrive at the l.D. of the part. It is suggested that direct I.D. tapes be used for Inside Diameter readings.

As a suggestion for checking very large diameters - pieces of masking tape may be used to hold the tape in proper parallel position.

When reading the O.D. tape, apply a snug pull of 5 pounds tension, first making sure the tape and part have been properly cleaned.

Pi Tapes Gages are guaranteed +/- .03mm accuracy on standard tapes up to 3600mm.

Care

When not in use, wipe clean and apply a light rust preventive oil. Store in tape container.

No periodic adjustments are needed.

Make sure the tape has not been stepped on or kinked, which may destroy the accuracy.


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