We Have Resurfaced Granite Surface Plates from California to North Carolina to Mexico
The Dark areas are
as result of
normal use. Note the wear areas are on
both sides of the plate. This is good and indicates that the Inspector
is using different areas to prevent major wear in one area. These wear
areas are only a few tenth's, ( .0001's ), however if all of this wear was
to occur in one place, it would be thousandths, ( .001's) of an inch.
both sides of the plate. This is good and indicates that the Inspector
is using different areas to prevent major wear in one area. These wear
areas are only a few tenth's, ( .0001's ), however if all of this wear was
to occur in one place, it would be thousandths, ( .001's) of an inch.
After lapping, all of the plates
are inspected
using a repeat-o-meter.
This simulates an indicator on a height stand but uses a .000010
resolution indicator to determine the ability to duplicate a reading
anywhere on this surface. This is only one half of the calibration
procedure due to the fact that a repeat-o-meter can not determine
flatness, only repeatability.
This simulates an indicator on a height stand but uses a .000010
resolution indicator to determine the ability to duplicate a reading
anywhere on this surface. This is only one half of the calibration
procedure due to the fact that a repeat-o-meter can not determine
flatness, only repeatability.
An
Autocollimator is used to measure the flatness of the surface plate.
This instrument uses collimated light that is bounced off of a mirror mounted
on a sled selected for its pad spacing. Sleds work like sine bars and convert
arc. seconds into millionths of an inch, rise or fall when moved in increments
equal to the pad spacing. This data is assembled into an actual contour plot of
the surface plate and calculates the overall flatness.
This instrument uses collimated light that is bounced off of a mirror mounted
on a sled selected for its pad spacing. Sleds work like sine bars and convert
arc. seconds into millionths of an inch, rise or fall when moved in increments
equal to the pad spacing. This data is assembled into an actual contour plot of
the surface plate and calculates the overall flatness.
This information is
used to produce a Certificate of Calibration
that is traceable to NIST and compliant to ISO/IEC 17025-2005,
ISO 9001-2000, Mil.Std.45662, ANSI/NCSL Z 540-1 & TS 16949.
This Cert. references the tolerances in the Federal Spec. GGG-P-463c
The "actual flatness" Validates compliance to these tolerances.
This Cert is a real tool that gives you relevant information that allows
you to use your surface plate to its full potential.
that is traceable to NIST and compliant to ISO/IEC 17025-2005,
ISO 9001-2000, Mil.Std.45662, ANSI/NCSL Z 540-1 & TS 16949.
This Cert. references the tolerances in the Federal Spec. GGG-P-463c
The "actual flatness" Validates compliance to these tolerances.
This Cert is a real tool that gives you relevant information that allows
you to use your surface plate to its full potential.
