Crankshaft Distortion Dial/Strain Gage
No. 696 (2-3/8 - 18")
No. 696M (61 - 458 mm)
The Starrett Crankshaft Distortion Dial/Strain Gage is an ideal gage for checking bearing alignment or shaft deflection without dismantling the engine. Also useful as a strain gage on
engine frames. This inside measuring gage checks the distortion of crankshaft webs (Fig. 1 and Fig. 2 see "More" diagram). This distortion bears a direct relation to existing misalignment or excessive
bearing wear. The Starrett Crankshaft Distortion Dial/Strain Gage makes it possible to check bearing alignment or undue shaft deflection without dismantling the engine. Used on all diesel engine shafts and
the center crankshafts on any type of engine or compressor, the gage can also be applied as a strain gage on engine frames (Fig. 3 and Fig. 4 see "More" diagram) while the engine is operating. A
comparison of readings taken at top and bottom positions indicates any misalignment of cylinder and frame which results in local over-stress and eventual cracking of the frame neck.
With a special spring tension in the dial indicator, the gage is self-sustaining in any position without sacrificing necessary rigidity, thus leaving the operator`s hands free. The contact points are conical,
with an approximate 60° included angle, hardened and ground to a sharp point, and will stay in place on 45° surfaces.
Starrett No. 696B Balancing Attachment is furnished with the gage. For certain applications, like turning the crank under test with the gage in place, the attachment can be adjusted to
maintain the face of the indicator upward or in desired position. To install it on a strain gage in use, remove the knurled clamping nut, then the doweled plate or end strap at either end by the
screw. The unit is then positioned over the hubs on two sides of the indicator head. A spring plunger provides the friction that holds the balance in proper relation to position. The parts are nickel plated.
The Starrett dial indicator movement is approximately 5/32" (4 mm) and with rods and extension, provides a range from 2-3/8 - 18" or 61 - 458 mm. There are 10 rods and one extension furnished. The rods
are marked to designate the approximate overall length of the gage. The indicator has a movable bezel to adjust the dial in relation to the hand and a non-breakable crystal.
This Starrett Crankshaft Distortion Dial/Strain Gage was designed in collaboration with the Hartford Steam Boiler Inspection and Insurance Company. It was known as the Hartford Steam Boiler Engine Strain Gage and
is used by their inspectors to check the distortion of engine shafts and frames as shown. |
No. 696B Balancing Attachment
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