4
After motion is complete the cam is considered to be in dwell for the reminder of the 360°
rotation. During dwell the output of the Index Drive is stationary even though the input shaft
continues to rotate.
Example: For a 270° motion, during 270° of input rotation the output shaft makes one index.
During the remaining 90° of input rotation the output is stationary.
IMPORTANT NOTE:
Some CAMCO units are called "type 2" units. In this case the cam has
two motion periods and two dwell periods on the cam.
Example: 250P6H20-270 Type 2 (also shown as Type II)
For 135° on input rotation the output shaft makes one index. During the next 45° of input
rotation the output does not move. For the next 135° of input rotation the output makes a
second index. During the next 45° of input rotation the output does not move. In summary,
two complete cycles of index and dwell are provided for one rotation of the input shaft.
Therefore, 50RPM at the input (cam) shaft equals 100 indexes/minute.
Index Drive Basic Service Requirements
1. The Index Drive oil level should be checked monthly and oil added as required to maintain proper
level.
2. The oil should be changed as outlined in the lubrication section.
3. All grease fittings should be lubricated with the recommended grease once per month.
4. All index drive mounting bolts should be checked for tightness after three months of service and
annually thereafter.
5. Cam followers should be inspected every 8000 hours of operation.
Inspection of Cam Followers
The cam followers should be inspected every 8000 hours of operation. Backlash at any station
indicates worn or damaged cam followers. Any binding during rotation of the input shaft could indicate
broken cam followers.
To inspect for excessive backlash, place the indexer in a dwell position and check for looseness by
physically trying to force the dial or crank arm back and forth. Excessive looseness (.0015” at 6"
radius) indicates replacement of the cam followers is required and the Index Drive should be returned
to DESTACO for repair.
Contact your local DESTACO representative for assistance if necessary.
