YZ traverse operation
The tank's YZ traverse carriage has the ability to position with a cross-tank (y) range of 3 m and a vertical (z) range of about 1 m.
- Mount the Vectrino+ probe in the holder, aligning it with a machinist's square and calipers. The measurement shown in the photo in the upper right should be approximately 0.432". This can be verified by flipping the square to the other side and remeasuring, ensuring the probe is equidistant from the square in each position.
- Lower the beach (see Beach operation).
- Install the linear bearing blocks onto the shafts at the beach end of the tank by removing the collars and carefully sliding the bearings into place. Note the marked orientation and direction of the bearings. Note that the Thomson bearings must be installed such that the shaft pushes out the plastic plug inside the bearing.
- Using the beach hoists, lift the traverse carriage from the two carabiners and remove the legs. Store the legs on the appropriate shelf up on the tank control platform.
- Lift the traverse carriage up and over the beach and push into position over the linear bearing blocks.
- Carefully lower the traverse carriage down onto the bearing blocks, lowering the slave side first, making sure the limit switch trip block does not catch the master side shaft mounting angle.
- Install the 1/4-20 SHCS from the "YZ Traverse" bin in each of the pillow block bearings threaded holes. The two stainless screws with washers get installed in the master-wavemaker side bearing.
- Tighten the slave side screws only finger tight, and torque the master side screws to _____.
- Ensure that the limit switch is indeed tripped when the traverse carriage is moved into position.
- Attach the traverse carriage to the tow carriage using 80/20 1515 extrusions, ensuring its parallelism with the tow carriage's beach side face.
- Plug the y- and z-axis cables into the circular connectors on the side of the on-board electronics cabinet.
Removal is essentially the reverse of installation. Be sure to use the bearing plugs with the Thomson bearings, and to install the traverse carriage legs appropriately.
If the traverse is to be stored in a high traffic area with the Vectrino probe installed, remove the probe from its holder, enclose it with the foam tube, and tape it to the side of the foil strut with gaffer's tape. Note the foam tube has 4 slits in it so the probe can slide down inside, protecting the small transducer prongs. See Figure 5 for more details.
The two axes in the ACS controller are defined as y and z. Units are in meters and seconds, similar to the tow axis. The axes can be controlled inside ACSPL+ programs, and by sending commands to the controller via the SPiiPlus terminal, e.g. ptp y, 0.1, which will move the y-axis to absolute position 0.1 m. Program buffers 12 and 11 will home the y- and z- axes, respectively.
The following motion parameters have been found to provide a good balance between speed, accuracy, and vibration:
y |
z |
|
|---|---|---|
VEL |
0.015 |
0.015 |
ACC |
100 |
100 |
DEC |
100 |
100 |
JERK |
1000 |
1000 |
The probe holder should be pulled out of the water. This can be achieved by executing ptp z, 1.18 from the SPiiPlus MMI terminal. The Tow Tank Controller Cabinet and On-Board Servo disconnects can then be shut off.