Logo for Judge Tool and Gage

GAR - (E-9) Electrical Discharge Machined Microfinish Comparator - 16 - 200 µin

Starting at $54.00
  • Electrical Discharge Machined Microfinish Comparator (EDM): Nine replicated EDM surface finish specimens ranging from 16 to 250 microinches.
  • The E-9 EDM MICROFINISH COMPARATOR is rectangular in shape (7/8" x 5") and is a corrosion resistant electroformed nickel duplicate of actual electrical discharge machined surfaces.
  • There are nine replicated EDM surface finish specimens ranging from 16 to 250
  • The E-9 MICROFINISH COMPARATOR is supplied in a leatherette case with engineering data and instructions
  • The E-9 is also available in metric with micrometer designations.
Additional Information +
Item No. Type Inch or Metric Our Price QTY
E-9 no Calibration Inch $54.00
E-9M no Calibration Metric $54.00
E-9C w/ Calibration Certificate Inch $300.00
E-9MC w/ Calibration Certificate Metric $300.00

Features:

Electrical Discharge Machined Microfinish Comparator (EDM): Nine replicated EDM surface finish specimens ranging from 16 to 250 microinches.

The E-9 MICROFINISH COMPARATOR Surface Roughness Scale provides an economical tool which permits roughness to be specified on the same basis as linear measurements. The surfaces presented are the result of years of research and engineering. Details covering this subject are now published in The American National Standards Institute (ANSI) specification titled: "Surface Texture, Surface Roughness, Waviness and Lay". ANSI/ASME B46.1

The E-9 MICROFINISH COMPARATOR Surface Roughness Scale is made by a dual electroforming process wherein nickel is electrodeposited to provide an exact reproduction in intricate detail. The same electroforming process used to produce the Surface Roughness Scale is available from GAR Electroforming to serve your product needs.

The surfaces used in this scale are reproductions of accurately electrical discharge machined surfaces on oil-hardening tool steel measured in microinches (millionths of an inch- 0.000001"). The numbers engraved alongside each surface are the average deviation from the mean surface expressed in microinches.

The E-9 MICROFINISH COMPARATOR Surface Roughness Scale provides industry with established flat surface roughness specimens for visual and tactual comparison. It is used in specifying and controlling surface roughness when a product having the appearance of typically EDM surfaces on tool steel, is required.