Installing the Crosshead Weights
5-7
Use
CautionCaution
Make sure the hand knobs or bolts are securely tightened. If the weightMake sure the hand knobs or bolts are securely tightened. If the weight
plates are loose, the crosshead may bind on the guide columns.plates are loose, the crosshead may bind on the guide columns.
Therefore, check the crosshead assembly on a regular basis.Therefore, check the crosshead assembly on a regular basis.
The crosshead must be equally weighted on both the front and back.The crosshead must be equally weighted on both the front and back.
5.5 and 10 lb. (2.5kg) and 4.5kg) weight sets
Install 5.5 and 10 lb weight sets as follows:
1.
Lower the crosshead onto the stop blocks and remove the front and back weight
plates. Place the back weight plate (the one without the hand knobs) on the upper
and lower crossbars so the grooves fit into the crossbar ridges. Make sure the small
dowel pins in the lower crossmember are aligned.
2.
Hold the back weight plate in place while you fit the front weight plate onto the
crossbars. The threaded end of the hand knobs must engage the back weight plate.
3.
Tighten the hand knobs.
4.
Slide the assembly up and down the guide columns. If it binds and shudders, lower
the crosshead to the stop blocks, loosen the hand knobs, rock the weights from side to
side and retighten. If the crosshead continues to bind or shudder, contact Instron
Dynatup.
25 lb. and 50 lb. (11.3kg and 22.7kg) weight sets
25 and 50 lb weight sets are installed in a similar manner as 5.5 and 10 lb weight sets
described in the previous section. However, 25 and 50 lb weight sets are secured by two
3/8 inch, 16 threads per inch bolts, rather than hand knobs.
75 lb. (34kg) Crosshead
A 75 lb. (34 kg) crosshead is built by installing a 50 lb. (22.7kg) with add-on plates, as
follows:
1.
Install the 50 lb. (22.7kg) weight set (refer to the previous section).
2.
Attach the add-on plates labeled 75 lbs. (34kg) by aligning the dowel pins on the
plates with the non-threaded holes on the crosshead. Secure with two 1/4 inch, 20
threads per inch x .62 inch (16mm) long socket-head cap screws on the opposing
diagonal from the dowel pins. Align the dowel pins on the plates. One add-on plate
should be mounted on the front and back of the 50 lb. (22.7kg) weight set.
100 lb. (45kg) Crosshead
A 100 lb (45 kg) crosshead is built by installing a 75 lb. (34 kg) crosshead with add-on
plates, as follows:
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