Specifications

Southwestern Industries, Inc.

ProtoTRAK SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual

2. The next thing to do is to visually inspect the sensor and base to determine if there has

been a crash. A damaged base will usually have crinkles in the small, spring plates on

the front and back.

3. Next make sure the sensor is preloaded correctly against the running surface. There is a

setscrew on the base that allows for adjustment.

4. If no outward signs of damage are present, remove the sensor from its base, and inspect

the wheel for damage and wear.

If the wheel is worn smooth in the center, replace the sensor.

Note: Sensors should not wear smooth for many years of normal operation.

5. If the sensor looks normal, it is probably OK and there is a mechanical obstruction

somewhere in the set-up. Look for the following possible problems:

• Broken sensor base

• Broken bracket

• Sensor tilted too much (so that the wheel is not engaging the running surface)

• Sensor chip scraper has doubled back and is pushing the wheel away from the

running surface

• Sensor chip scraper is defective or has worn and is pushing the sensor unevenly

4.7.2 Measurements Do Not Repeat

1. Determine if the error in repeatability is random or accumulating:

• Mount a dial indicator in the quill

• Touch off a fixed point on the table and set the DRO to 0.

• Traverse away approximately 6 inches

• Return and touch off again

• Write down the reading on the DRO.

• Do not re-zero the DRO, traverse away and return several times

• Write down the DRO readings

Random error will be unpredictable and give scattered readings, adding and/or

subtracting the error after each traverse with no pattern. See Step 2.

Accumulating error will add roughly the same amount to the reading after each

traverse. See Step 3.

2. For random error, look for problems in the set-up of the TRAK Sensor that have resulted

in a loss of rigidity. Common sources of random error include:

• broken base

• broken bracket

• loose puller screws

• loose run bar

• very loose motion of the table or saddle

• loose clamp screw