MEASUREMENT IMPROVEMENT OF 552 FIBER OPTICS STEREO VIEWER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002900040052-0
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: November 25, 2002
• Sequence Number: 52
• Publication Date: December 2, 1966
• Content Type: LETTER

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OF
2003/01/
Approved FoIL (ease
Subject:
Measurement Improvement of
2 December 1966
Stereo Viewer 25X1
As has been discussed verbally on several occasions, the measurement
accuracy of the =Machine could be improved through additional efforts. The
two approaches described below each have their individual advantages. In the
case of the first approach, it is an immediate fix but does not have a long
term advantage. The second approach (cam adjusted) has a long term advantage
in that further measurement improvement and/or calibration can be made quickly
as a function of machine usage, wear, and basic aging of machine parts.
Approach 1 - Shimming
Since the principal cause of error in the measuring capabilities of
the =Machine is due to slight distortion in the ways, refinement in the
machine geometry can be accomplished. The basic method of refinement is to
measure the slight distortion and shim the ways sufficient to bring this
distortion to a minimum. This is a time consuming and temporary approach
since time and use will cause further distortions and require further shimming.
It has a further disadvantage in that it will require the machine to be down
for a period of at least two weeks and probably four weeks for each corrective
action on each Y axis. With respect to the X axis, the down time is greater
by a factor of two.
Cost analysis sheets applicable to the estimated time to accomplish
each axis shimming are attached. We have estimated some four weeks of effort.
If all four axes are accomplished at the same time, the calendar time would
not be additive; some overlapping effort could be achieved, thereby reducing
the total time to approximately four months for all four axes.
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Approach 2 - Cam Adjustment
Because of the detailed effort and extensive down time required to
accomplish the shimming operation, another approach was taken to negate the
errors and accomplish the program with minimum down time and with major long
term effect. This approach is to design a cam which is attached to the basic
machine and carriage in such a way that as a function of distance moved the
zero of the encoder is changed and thereby provides the output to the encoders
and computer calibrated to the basic errors of the machine. A drawing of the
configuration of the cam device is attached. As shown in the figure, a fixed
roller attached to the carriage drives a pivotally mounted cam that, in turn,
actuates a rotatably mounted encoder. The cam function would include the
average composite error of ways and screw for the axis it serves. The unique
feature of this method allows change and reduction of error in a controlled
manner without disturbing optics or other mechanisms of system. Cams and
mechanism will be accessible for modification or servicing.
It should be pointed out that the cost analysis sheet attached for
this approach is for all four axes and is based on using a straight cam to
provide a straight line approximation of the errors and adjust accordingly.
The cam could be shaped to further reduce the errors to an absolute minimum,
based on a detailed calibration of the equipment. We have not estimated this
approach since we understand that if all four axes can be brought to within
asmaximum accuracy of eight microns, further refinement is not necessary. We
have estimated that the machine down time to accomplish the installation of
all four cams and associated hardware would amount to two to three weeks.
The total contract time would be two to three months to prepare the hardware
obtain the purchase items, and perform the installation.
It is firm opinion that a greater degree of measurement
accuracy could be obtained using the cam adjustment approach, a considerably
less down time, and a means of easily recalibrating the QLKachine as a
function of time and wear. It also offers the opportunity at a later time
to shape the cams to provide greater accuracy than initially proposed herein.
The quotation submitted herewith is valid for sixty days from the
submission of this letter and is based upon 75% progress payments, based on
total cost incurred during any monthly period. The contract is based on a
total estimated time of three months for the cam approach from date of award
to complete installation in your facility. If we can provide any additional
information or establish a meeting to discuss this matter in detail, please
do not hesitate to contact us.
Very truly yours,
LHB/aw
Enc1: (2) Cost Sheets 1 & 2
Fig. #1
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