Dillon X Force Gauge - Manual (Page 13)

Model X Mechanical Force Gauge User Instructions 13
2.5 Helpful pointers
l Note that threaded mounting holes have been provided in opposite faces of
the “U” shaped deflection beam, #1. In the upper mounting hole, a
spherically recessed pressure button, #4, is screwed. This button is
hardened and plated. It receives the loading ball, #11. Force should be
applied directly against this ball. In operation, the deflection beam bends
inward slightly, and the ball revolves, tending to keep the line of force
vertical. A drop of light oil on the ball assists this action.
l
Never fasten the “U” shaped deflection beam in such a way that the free
movement of the upper portion will be restricted. The lower or thicker “leg”,
however, may be tightened as securely as desired, using a stud or bolt
through the threaded mounting hole.
l
Since the deflection beam is hardened, it is not possible nor would it be
recommended, to drill and tap it once it is in the field. If special mounting
holes are desired, these can be provided during early stages of
manufacture, but must be specified at that time.
l
If a particular test calls for load application through a pulley, roller or chuck,
etc., due care should be taken to see that the load is applied in a true vertical
line through the center of the top mounting hole #4. Off-center loading would
introduce leverage, thereby increasing or decreasing readings from their
true value. Universal joints or hinged fittings should be carefully machined to
obviate side slop or play. If in doubt about the best method of applying load
for specific arrangement, don’t hesitate to consult our Engineering
Department. Remember, a rough pencil sketch or snapshot will aid
tremendously in understanding your problem. Never oil the dial indicator at
any point. It is unnecessary. If oil or other fluids should get on the unit, wipe
off gently, but well. Foreign matter lodging on the plunger, #6 will retard its
free action, resulting in inaccurate readings.
l
If accidental overload is anticipated, a solid steel rod about 3/4 inch in
diameter can be inserted at the center point of the Gauge between the “U”
shaped bar. Length of this rod should be figured so that the upper, flexible
half of beam will bottom against it, once the full capacity of the instrument
has been reached. Further load will then pass through this solid path without
harm to the Force Gauge. Note the method of mounting the dial indicator to
the supporting bracket on the reverse side of the case. Allen screws are
used. Be sure to check these screws at intervals, making sure that they are
always tight. Vibration may in time loosen them slightly, and it is best to take
this precaution.