DE-STA-CO INDEX DRIVES QuickStart User Manual
Page 2
INDUSTRIAL MOTION CONTROL, LLC
PHONE: 847-459-5200
1444 SOUTH WOLF ROAD
FAX: 847-459-3064
WHEELING, IL 60090 USA
©Industrial Motion Control, LLC 1999-2004 All Rights Reserved. This publication is for information purposes only and should not be considered a binding description of the
product except if confirmed in writing by Industrial Motion Control, LLC.
12/2004 SKU 0157
V. ADDITIONAL HINTS:
1. Cam followers with radial looseness indicate wear and
should be replaced immediately. Axial play of the
follower outer shell on the stud is normal.
2. Cracked or broken cam followers indicate overloading –
replace followers and check for malfunction of overload
protection. When installing new followers, care should
be taken to push only on the center of the stud head
and not on the flange of the stud. The stud should be
lubricated and carefully aligned when it is pressed into
the hole.
3. Backlash at any station indicates worn or damaged cam
followers.
4. Any binding on rotation of the input shaft is an indication
of broken cam followers.
5. Contact your nearest IMC representative for assistance
if necessary
VI. TROUBLESHOOTING GUIDE:
IMC recommends that only technicians experienced in index
drives maintenance make repairs. A full year warranty is
given on any unit rebuilt by IMC.
If the customer must rebuild the unit themselves, they
should refer to the individual service manual that applies to
theirs model index drive. They should follow step-by-step
procedures for disassembly and assembly as described in
theses manuals. Cautions and warnings should also be
followed.
NOTE: IMC will not warrant any unit rebuilt by the
customer.
SYMPTOM: INDEXER APPEARS INACCURATE
1. Check if unit stops in dwell. See the assembly drawing
for your unit for keyway position in dwell. Also refer to
the cycle cam and limit switch function in the General
Service Manual.
2. Is the output shaft backlash-free in dwell? Be sure to
disconnect all other devices from the indexer output
including an output overload clutch. All indexers must
be backlash-free in dwell (see SYMPTOM: Looseness
in Dwell).
3. How is the accuracy being checked? IMC uses a
computer controlled checking machine to check each
index against a theoretical perfect index. Contact the
factory for assistance. IMC keeps inspection reports for
units with special accuracy (units required to be within
closer tolerances that the standard).
SYMPTOM: LOOSENESS IN ONE DWELL
1. Followers are worn and need replacing.
2. Follower wheel is damaged and needs rework or
replacement.
SYMPTOM: LOOSENESS IN EACH DWELL
1. Camshaft is loose in bearings. Check for end play in
input shaft. Adjust shims on bearing caps. See
individual service manual for pre-load setting
procedures.
2. Cam is loose on shaft. Usually repaired at the factory.
3. Cam is broken. (This rarely happens and is an
indication of an overload application or a jam.)
4. Unit was very heavily overloaded and all bearings
loosened up. Factory rework required.
5. All followers are worn. Rebuilding by factory is best
remedy.
6. Output shaft to follower wheel connection is loose.
Factory repair is recommended.
7. Customer output member connection loose. Tighten
output member and dowel in place.
SYMPTOM: INDEXER IS NOISY
1. Check to see if output is backlash-free in dwell.
2. Check for excess looseness in motion. Cam or follower
could be broken.
3. Is the noise from the reducer rather than the indexer?
4. Occasionally, variable speed D.C. controls cause the
input to pulsate and create noise. Adjust the Internal
Resistance Compensation within control.
5. Are the input and output connections backlash free?
6. Is the unit overloaded? Loads can change over a
period of time due to wear.
7. Is the unit support (base) rigid?
8. The unit could be overheated and have loose pre-load.
9. Is there sufficient oil in the unit? Is oil used consistent
with IMC specifications? (See Index Drive Lubrication).
SYMPTOM: PREMATURE WEAR ON FOLLOWERS
1. Actual forces on the unit could be greater than
calculated due to loose input or output.
2. Lack of oil or wrong oil used (See Lubrication section of
Index Drive Service).
3. Frequent or severe overloads.
4. Improper input systems (where there is not a constant
velocity input) will cause an erratic output or excessive
output vibration. This will result in forces several times
higher than calculated (see input recommendations).
5. Defective cam or follower wheel assembly.
SYMPTOM: OUTPUT MOVEMENT IS ERRATIC AND
VIBRATING
1. Input does not run at a constant velocity. The prime
objective of a good input connection to an Index Drive is
to maintain a constant shock free velocity (see input
recommendations). Motor running too slowly could also
cause an erratic output.
2. Output connections loose, flexing, or winding up.
Check all connections (see recommended output
connections).
3. Excessive friction drag on output. Disconnect indexer
and investigate friction torque.
4. Unit is overloaded due to excessive speed or loads.
Contact your Sales agent to check data sheet
application loads and speeds. Decrease speed.
5. Unit could be internally damaged. Check other
symptoms.
6. Unit support is not rigid. Check rigidity of index drive
mount with an indicator. Stiffen support or decrease
speed.