All specifications are subject to change without notice.
All marks indicated by ® and ™ are trademarks of Hardinge Brothers, Inc.
Mounting a Machined Dead-Length
®
Step Chuck in the Lathe
Litho in U.S.A.
April 1996
Form No. B-67A
Part No. BA -0009500-0067
QUICK START
Mounting-D.L. Step Chuck
• Clean Spindle & D.L. Step
Chuck
• Open the Collet Closer
• Slide DL Step Chuck into
spindle aligning Key with Key-
way
• Put the workpiece in the Dead-
Length Step Chuck
• Adjust Closer until back face
of DL Step Chuck just Con-
tacts spindle face
• Turn Closer 1/2 Turn more &
Continue to next screw hole.
• Tighten Screws in Closer
• Do not exceed a chucking
force of 5,000 pounds
•
Clean the machine spindle & the Dead-Length Step Chuck.
•
Activate Closer to its
"Open" Position.
•
Slide the complete assembly into the spindle of the machine aligning the spindle
key with the keyway on the Outer Collet.
•
Place a workpiece in the bore of the Dead-Length Step Chuck.
•
Draw the assembly into the spindle by adjusting the collet closer draw tube
until the back face of the Step Chuck just contacts the face of the spindle. A
very noticeable increase in resistance will be felt at this point.
•
Further tighten the draw tube 1/2 turn and then continue turning until the next
screw hole lines up.
•
Tighten the Screws on the collet closer.
•
Close the collet closer.
•
Adjust the collet closer to the proper closing force. Maximum Recommended
Force: 5,000 pounds.
PARTS LIST
Stop Rod
Spring Retainer
Nut
Nut
Outer Collet
D.L. Step Chuck
Stop Body
Belleville Springs (2)
Coil Spring
1-1/8"
Pin
Stop
Rod
Drive Pin
Description
Hardinge Part Number
Quantity
20C Dead-Length Step Chuck Assembly
2041-00-00-000000
1
– Emergency Dead Length Step Chuck
2037-00-00-000000
1
- Pin (Used when machining out the step chuck)
7731-00-00-000000
3
- Drive Pin
7734-00-00-000000
1
– Nut
1185-00-00-000000
2
– Outer Collet Body
2039-00-00-000000
1
– Spring - Coil
1187-00-00-000000
1
– Spring - Belleville
AM-9011700
2
– Spring Retainer
1815-00-00-000000
1
– Stop Body
1813-00-00-000000
1
– Stop Rod
1271-00-00-000000
1
20C Collet Wrench
(For holding Outer Collet during assembly)
CL-0011759-A
1
20C Inner Collet Spanner Wrench
7897-00-00-0000001
1
Molybdenum Disulfide Grease (Moly-Lub,3 Oz.)
VS-10440
1
HARDINGE INC.
One Hardinge Drive, PO Box 1507
Elmira, New York 14902-1507 USA
To Order call:
800-843-8801 • Canada : 800-468-5946 • Phone: 607-734-2281 • FAX: 607-734-3886
