dual thrust lead screws
Introduction

•Installation
Specifications
Lead Screw
Lead Screw Diameter
1/2"
Lead Accuracy
Standard
0.000050"/turn, 0.000100"/inch

Available
0.000010"/turn, 0.000025"/inch

Bearing Thrust Plane Accuracy
Standard 0.000030" TIR
Available 0.000010" TIR
Standard Travel
Each nut 2", 4", 6"
Standard Leads
0.025", 0.050", 0.100", 0.200", 2 mm
Lead Screw Material
A6 hardened and low temperature stabilized
Lead Nut
Max. No-Load Torque
8 oz in per nut
Max. Load (including inertial)
50 lb
Working Load (including inertial)
10 lb
Stiffness of Nut
5 lb/0.0001"

1/2 Inch Diameter Screw

Installation
Shaft Coupling
A flexible antibacklash coupling is needed between the drive motor and lead screw to isolate the motor bearing errors from the lead screw thrust bearing. Split clamps are recommended to prevent loosening by motor torque pulses.

Lubrication
Each thrust nut requires periodic lubrication. Universal can supply a recommended lubricant.

Mounting
The lead screw must be rigidly mounted precisely parallel to the direction of motion. The O.D. of the thrust bearing must be a sliding fit in its bore, and must be clamped axially only.
      For travel of two inches or less, the thrust bearing provides adequate radial support, and a bearing at the outboard end may be omitted.
      The nut clamp area must be fully and rigidly supported by the other slide member. Coaxial alignment of the clamp area with the lead screw must be preserved within 0.002".

Mounting Brackets
Universal offers optional mounting brackets to simplify installation of the dual lead screw assembly. A thrust bearing bracket provides proper support and alignment for the thrust bearing. A motor bracket is available to use with the thrust bearing bracket for simple, prealigned motor support. The thrust bearing and motor brackets are factory assembled. Depending on the configuration, a nut bracket, assembled by the user, is available.

Ordering
Specify lead, travel, and accuracy required. Mounting brackets can be specified separately. Nonstandard leads can be supplied.

Note:
Nut assemblies must not be removed.

For complete specifications on our single thread lead screw assemblies, see precision lead screw assemblies, get our catalog, or call us to review your requirements.

30 Chambers St., Fairfield, Connecticut 06825
Tel: 203/336-1849 Fax: 203/366-1326
E-mail: Sales

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