TECHNICAL PROPOSAL FOR A COMMON STAGE LINKAGE FOR THE HIGH POWER STEREOVIEWER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A001400020016-9
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 37
• Document Creation Date: December 28, 2016
• Document Release Date: January 28, 2005
• Sequence Number: 16
• Publication Date: December 11, 1967
• Content Type: REQ

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NPIC# 21/68 - Copy #3 -
fnr artinn
Declass Review by NGA.
NGA Reiew Complete
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STAT
STAT Approved For Release 2005/02/17 : CIA-RDP78604770A001400020016-9
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Approved For Release 2005/02/17 : CIA-RDP78604770A001400020016-9
Technical Proposal
For A
Common Stage Linkage
For The
High Power Stereoviewer
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TABLE OF CONTENTS
1.0 INTRODUCTION
2.0 SUMMARY OF REQUIREMENTS
3.0 CONCEPT ANALYSIS
4.0 DESIGN DESCRIPTION
5.0 STATEMENT OF WORK
LIST OF FIGURES
Figure I 3 Bar Connecting Structure
Figure II 3 Bar Structure - Force Distribution
Figure III "X" - y! Adjustment
Figure IIIA Mock Up
Figure IV Focusing Adjustment
Figure V ? Attachment Assembly*
Figure VI Attachment Linkage*
* Prints Attached
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1.0 INTRODUCTION
proposes to design, develop and fabricate an attachment
for the High Power Stereoviewer in accordance with the statement of
work, section 5.0. The intent of this attachment is to minimize the
time required to re-establish a stereo model when moving to different
locations on the chip.
The particular design proposed is a very simple three bar type linkage
which uses the present stages, and their motions, without change. The
stages can be driven in common or differential from either set of exist-
ing control knobs. The proposed system is most compatible with present
High Power Viewer operational methods.
Section 2.0 summarizes the requirements for the attachment. Various
concepts of how the attachment problem may be solved are analyzed in
Section 3.0. The proposed design approach is described in Section 4.0.
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2.0 SUMNARY OF REIVIREMENTS
The attachment is to meet the following requirements:
2.1 A minimum modification to the Stereovicwer is desirable and the
attachment shall be removable from the instrument.
2.2 The attachment shall allow 1/2 inch independent vertical move-
ment of the stages for focusing.
2.3 The attachment shall provide less than .005 inch backlash or lost
motion between the stages.
2.4 Independent motion of the stages shall have less than .003 inch
backlash or lost motion.
2.5 4 x 5 inch film holders shall be provided which allow viewing of
any 2 x 3 inch area within the 4 x 5 inch format.
276 The chips shall remain in focus over any 2 x 3 viewing area while
operating at a system magnification of 200X.
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3.0 CONCEPT ANALYSIS
Prior to analysis another specific requirement was added to those in
paragraph 2.0. As a goal the attachment should not degrade the scanning
performance of the present stages. The operator-instrument direct
relationship experienced in manual mechanical drive through the control
knobs should be maintained. With this requirement as a background, the
stages were tested for fineness of adjustment and adjustment speed. Using
a cross hair eyepiece and a scale on the stage at highest magnification,
four individuals measured their minimum mechanical resolution. That is
the smallest amount they could perceptively move the stage. This was
averaged at .4 microns. The same four individuals were then asked to
drive the stage from one extreme to the other at a fast rate. The readings
averaged a scan speed of .25 inch per second in the X direction and close
to .3 inch per second in the Y direction.
To meet the stated and generated requirements, four general approaches were
considered:
1. Electric Motor Drives
2. Mechanical Coupling
3. Duplex Stage Control
4. Simple Stage Connectors
3.1 Electric Motor Drives
In this approach, electric motors would be connected to each of the
stage drives. Each of the (4) motors could be controlled separately
or coupled electronically to provide common stage motion. The
. analysis showed:
a) Servo-motors with the required shaft encoders and circuitry would
be costly relative to the basic instrument.
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b) Synchronous motors or stepper motors do not provide both the
control resolution and acceptable speed without gear changes.
c) Motors do not provide the direct control feeling obtained
through direct knob drive.
3.2 Mechanical Coupling
This concept consists of coupling the existing stage drive knobs
together with a mechanical drive train so that either, or both
stages could be operated by turning the present knobs. Since the
knobs traverse along with the stage, any such coupling would require
a number of splines, gears and racks which inherently add backlash
and play to the system. It would also be costly.
3.3 Duplex Stage Control
The use of a control pod mounted between the two stages was consider-
ed. The pod would be attached to the base of the Viewer and contain
drive arms extending to the stages. The present drive knobs would be
eliminated and stage control would be from 4 knobs placed at the
center of the pod.
This system would necessitate extensive changes to the Viewer, al-
though it would meet the precision requirements of the system. It
also is costly in itself.
3.4 The geometry of the present stage location and travel distances makes
it unlikely that an X-Y-Z slide arrangement would be successful. This
would be a system which adds an entirely new X-Y stage system The "Y"
motion is added on top of the "X" and independent "Z" motion on top of
the "Y". The stages can be coupled for common motion. The relative
bearing lengths allowed by the maximum and minimum stage separation
would involve high bending loads (and deflections) at the wider separa-
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tions. The approach would also be undesirable from the number of
parts required, the manufacturing tolerances or adjustments and the
number of locks involved to tighten or release the system.
3.5 Simple Stage Connectors
A number of linkages were considered for a direct connection between
the stages. This type of connection between stages must be siMple,
structurally rigid and require very little rerun. Layout drawings,
deflection calculations and an actual mock up on the instrument were
used in this analysis. The analysis indicated:
a) It is possible to drive the stages from the existing control knobs
while the stages are rigidly connected together.
b) Paragraph 3.1.5 of RFP RD-8-68 requires a 4 x 5 inch chip capa-
bility. To meet this specification, it will be necessary to modify
the stage in such a way as to restrict the space available for a
connection between the stages. It is therefore unlikely that a
folding bar or parallelogram mechanism could be used because of
the space limitations.
3.5.1 3 Bar Linkage
Ailalysis of a three bar linkage principle led to discovery of
a simple, inexpensive approach that is ideally suited to solv-
ing the problem. The three bar structure is arranged as shown
in Figure I and is composed of two connecting bars and the side
of the stage.
LEFT
STAGE
RIGHT
STAGE
Figure 1 - 3 Bar Connecting Structure
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This construction is inherently rigid since any force on the
structure is supported solely by tension or compression in
the legs or bars. For example, if the right stage is pushed
toward the rear of the instrument, the force distribution in
the structure is as shown in Figure II.
Load from Left Stage
Tension
Reaction Force
Reaction Force
Figure II - 3 Bar Structure - Force Distribution
If the load is 1#, the reaction forces are 2# and the rear link
is in the 2# tension and the front link is in 2.2# compression.
If 1/4 inch diameter steel bars are used, the deflections could
be calculated as:
= x
2 10 -5 inches
AE
= 21 = 1.36 x 10 inches
AE x(.125)2 x 30 x 106 due to extension
and
2.2 x 11.2 -5
1.67 x 10 inches due to
X(.125)2 X 30 x 106 compression
The resulting displacement of point A relative to point B can
be found by simple trigonometry to be 6.4 x 10-5 inches.
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In comparison, if a single wide plate were used to connect
the stages, the deflection of point A would be caused by
bending in the plate. To restrict the deflection to the
same as the 3 bar linkage, the width of 1/4" thick steel
plate would have to be:
3
_
3
4000
30 x 64 x .25
3
14 =.p.32
Width = 2.0 inches
Thus the 3 bar approach, with its flexibility for vertical
focus and convenient means for converting to differential
motion, provides the-necessary rigidity in a simple, light
weight manner.
Comparing the 3 bar structure to the alternative methods of
connecting the stages shows that the bar structure has the
following advantages:
A) It contains no moving parts in the driving mode and is
inherently free of backlash.
b) The structure requires a minimum of space.
c) Only minor assembly changes are needed to the existing
instrument. The attachment can be easily removed from the
instrument by means of only four screws.
d) The structure is inherently rigid since no bending deflect-
ions are encountered.
e) The relative simplicity of the system minimizes cost.
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The 3 bar structure was mocked up aAd attached to a stereo-
viewer. (Figure IIIA). In this mock up the stages moved
within .002 inch when driven in one direction along the y
axis. Due to the normal fits and clearances in the stage
bearings of the standard High Power Stereoviewer, up to
.015 inch backlash occurred when the direction of movement
was reversed. A production model of the 3 bar linkage With
its telescoping fits, used with instruments with possible
greater wear and looser fits from usage, may have slightly
more play.
Because the 3 Bar linkage uses the existing stages as they are,
backlash values may exceed specification requirements. Of
course this can be removed by a simple reversing procedure.
The 3 bar linkage is proposed because it is felt its many
advantages (simplicity, lower cost, ease of operation, ease
of detachment and assembly, etc.) far outweight the backlash
that may be encountered with some existing instruments. This
approach is assessed as complying with the stated design intent
of "minimizing the time necessary to re-establish a stereo
model".
would be pleased to supply the mock up parts
pictured in Figure IIIA for customer evaluation of the approach
on their instruments. Though this mock up only provides for one
stage to stage configuration and focus position, the application
of this simple solution may be evaluated.
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4.0 DESIGN DESCRIPTION
The simplicity of design, operation and attachment of the proposed three
bar linkage is best described by a series of figures. Figures V and. VI
are preliminary layouts showing the attachment and connecting bar con-
struction. These will be discussed in detail later.
Figure III illustrates how the two connecting bars telescope together to
allow various stage separations. The right stage assembly actually makes
up the 3rd bar.
Referring to Figure III:
A) Shows the position of the connecting structure at the nominal stage
position.
B) Shows the structure at maximum stage separation in X.
C) Shows the structure at maximum stage separation in X and Y.
D) Shows the minimum stage separation in X and the maximum in Y.
To achieve the range of independent motion required two telescoping sections
are required in each connecting bar. These are shown two times size in
detail 1 of Figure VI. Knurled rings A and B are locks.
For independent motion the operator unlocks the connecting bars with the A
rings. See Figure V. If this does not provide sufficient range of motion
the B rings are also used to unlock the second telescoping section. For
common motion the operator locks whichever of the A or B rings that are
unlocked. All stage motion is accomplished through the present drive knobs,
both independent and common.
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Larger stage plates and film clips are provided to accommodate the larger
film chips. The clip configurations can easily be modified to pivot if
required, for varying chip orientations.
The connecting bars are terminated in balls which permit vertical motion
of either stage for focus. Figure IV illustrates how the 3 bar structure
would function during focus adjustment. The stages could be raised or
lowered through the same range as available on the present Stereoviewers.
Obviously, a slight change in stage separation will occur due to the consine
of the inclination angle e. For a tl/4" adjustment however, the stage
separation would change less than .008 inches (at minimum stage separation).
The High Power Stereoviewer was not designed for simultaneous scanning of
the stages and, therefore, there are inherent aspects in the design and
? construction of the basic motion mechanisms which must be considered, if
they are to be used in conjunction with a simple linkage. The separate
stage motions of existing instruments were not aligned with respect to each
other of course. Within each stage the orthogonality of the X and Y motions
are held within 30' of angle. Thus within any instrument, rigid connection
of the stages could result in binding during common stage motion..
No adjustment may be required on most instruments while others may require
some readjustment (such as arm position, stage motion adjustment, and pod
location in the arm if affected by the other adjustments). When required,
this service could be supplied by
Since these tolerances arSTAT
inherent in the design of all existing High Power Stereoviewers some instru-
ments may require adjustment when used with any attachment device that
rigidly couples the existing stages.
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5.0
IAT
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STATEMENT OF WORK
proposes to design and fabricate one attachment to the
High Power Stereoviewer, in accordance with the Development Objec-
tives, 29 Sept. 1967 except that backlash shall be consistent with the
statements of Paragraph 3.5.1 of this proposal.
Clarification: Paragraph 3.1.3 of the Development Objectives refers to
the present stage motion as 2 x 3 inches whereas the instrument specifi-
cation calls for 50 x 75 millimeters. The proposed approach does not
change the motion provided in the basic instrument.
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STAT
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December 11, 197
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Attention: James Ac.
Subject: Request for i?roposal No, AD-C-6E
Project No. 02318
Gentlemen*
nclosed are two copies of our Technical Proposal and Cost
breakdown for the subject request. Under separate cover,
three copies of each are being forwarded directly to your
Technical Representative.
The excellent perforiaance, reliability and operator satis-
faction of the high Power 3treoviewer is well known within
your activity. The additioll of the requested common stnre
will enhance the function of this instrument,
with your guidance and direction, was responsibse Ign
Power Stereoviewer from its conception in the design stages
to the present position of production orders. Our intimate
knowledge of the High Powert.ereovi
specifications and applications make 1771 its tolerances,
uniquely qualified
to perform the proposed development. ey personnel as-
sociated with the High Power Stereoviewer developJlent also,
will be available for work on the Common Stage, either
directly or as required on a consulting basis.
As indicated on the enclo3e.3 Alrm 633-4, f1rL1 fixed price
for the prototype unit is I It is our best judgement
that delivery can be made . wees after receipt of a con-
tract. For planning purpose, budgetary se111n prices for
10 units are each and for 100 units I I each,
Please contact the writer for any question concernin this
proposal.
zin'cs. 2
V 1:47.'U' f "WI 11 At 1
Program Administrat64(
Photogrammetric & alitary 4yste7as
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