TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 319 of 590

TM 9-1240-401-34&P

6-9

a. SETTING UP INSPECTION FIXTURE

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Place inspection fixture (1) on a clean level surface

at a height suitable for comfortable viewing through

collimating projector and collimating telescope.

Mount reflecting mirrors (2) on inspection fixture

(l), making sure that all mating surfaces are free of

dirt, burrs, and other defects which would interfere

with proper seating.

Insert special test reticle 8599932-15 into collimat-

ing projector (3).

Install collimating projector (3) in collimator holding

fixture (4) with vertical reticle line approximately

vertical.

Insert special test reticle 8599932-14 into auxiliary

telescope (5).

Install auxiliary telescope (5) in support (6) with

vertical reticle line approximately vertical.

Mount collimating telescope (7) in collimating tele-

scope holder (8) on surface gage.

Adjust height of collimating telescope (7) to height

of auxiliary telescope (5) on inspection fixture (1).

Suspend a plumbline approximately 10 feet

(3.05m) from collimating telescope (7) viewing

point.

View plumbline through collimating telescope (7)

and revolve collimating telescope (7) until vertical

reticle line is in coincidence with plumbline image.

Secure collimating telescope (7) in collimating tele-

scope holder (8) to maintain the trueness of the

vertical reticle line.

Place collimating telescope (7) in line with auxiliary

telescope (5).