About Fred V Fowler
Solve Tricky Problems for Missouri Manufacturer
| Gardner Denver
Solves Unique Measuring Problem with "Double" Universal
Gage from Fowler
Question: how to measure a part 80" long to a close tolerance
of .002"? This was the challenge at Gardner Denver Machinery
Inc., which had long searched in vain for a reliable way
to check the external length of an impeller used in a blower
it produces and the case in which it fits, requiring an
equally tight tolerance.
"We had looked
for any available instrument to perform this function and
asked several manufacturers until we learned from attending
the IMTS show that there was a universal gage available
that possibly could get us to our 80" requirement," says
Ray Tyler, Quality Assurance Engineer at Gardner Denver,
the well-known producer of compressors and blowers, pumps
and oil field drilling equipment.
At the show,
Tyler reports, he saw a Fowler/Bowers internal/external
universal gage that normally measures to 10". After presenting
his impeller measuring problem to the Fred V. Fowler Company,
it was suggested that two 40" extensions could be added
to the gage to do the job. The gage was designed to accept
extensions which are standard "off the shelf" components.
However, 80" had never been requested.
After a demonstration
at Gardner Denver's facility by Fowler, using a single extension
to measure 40", it was determined that the gage should be
accurate for the 80" measurement if it is preset to a master
the same way it is to be used on Gardner Denver's components.
Later it was proven that the universal gage did repeat within
.00015" over 80".
Denver performs the unusual job of accurately measuring end
to end the external length of an 80" impeller to a tolerance
of .002" with a Fowler/Bowers internal/external universal
gage with extensions. Denis Newton of Bowers Metrology trains
Gardner Denver's staff on setting up the gages and extensions.
"It was the first
time we had needed to measure any length beyond 66" and
it was clearly an unusually difficult assignment," he said.
Tyler reports that a key part of measuring 80" was to employ
two machine operators to hold the extended gage's ends against
the part, using the constant measuring force of the gage
which has a range of .625". Tyler adds that this constant
measuring force nullifies deviations often caused by different
operators of the instrument.
The Bowers universal
gages have minimum/maximum/TIR modes, a resolution of .00005"(.001mm),
a rotating display as well as two features not yet employed
by Gardner Denver: direct RS232 output and two presets.
"We also use certain accessories, especially the spherical
contact points, depending on whether we measure flat or
curved surfaces," he says. Normally the standard Bowers
gages designed for Fowler are used to measure inside and
outside diameters, threads, slots, recesses, grooves, tapers
and similar aspects of parts.
which received its ISO 9001 certification in 1995, spends
a good deal of time in training its operators to use various
types of metrology equipment. "We believe in careful training
so that production operators can solve their own problems.
It's also highly-time efficient."
Use of this instrument
may not be confined to the long impeller and its case, according
to Tyler. "It will actually be used for anything that needs
quick inside and outside diameter measurements.