Section 1 - Introduction; Section 2 - Description - Newport 850G Series User Manual

Section 1
850G Series Linear Actuator User Manual
1.0 Introduction
Section 2
2.0 Description
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This manual describes the operation of Newport 850G Series Linear
Actuator. When purchased with a Newport controller, the 850G is fully
compatible with the ESP MotionMaster, and PMC200 series controllers. If
you have purchased the 850G for use with your existing Newport
controller, please read carefully the section below listing your controller
for compatibility and upgrade information.
The 850G actuator incorporates a versatile design which can be
configured with travel limits from as little as approximately 1/32 inch to 2
inches (0.8mm – 50mm), enabling it to be used on a wide variety of
Newport translation stages and mirror mounts. Mechanical limit switches
cut motor power preventing accidental over-travel. The actuator
incorporates a manual actuation knob for coarse adjustment (with the
motor power off).
To provide accurate motion, the actuator's 3/16 inch diameter plunger is
non-rotating. The standard gearbox ratio actuator can produce a maximum
thrust in excess of 25 pounds (11 kg); but, when operating continuously
over many cycles, the maximum load is rated at 18 pounds (8 kg).
The actuator's internal structure is a precision-rolled leadscrew with a
0.8mm pitch. The pitch of the leadscrew has been chosen to provide the
same encoder resolution when combined with the standard gearbox ratio
(See table section 3.4). Production variations about this average figure can
be compensated by Newport controllers via software commands allowing
the user to limit cumulative, monotonic inaccuracies to within 0.005%. A
non-rotating low friction Turcite nut engages the leadscrew and pushes
the plunger. A Turcite half-nut is used to trigger a travel limit in the
extended position while the lead screw nut trips the limit at full retraction.
The limit switches are repeatable to approximately 40µm.
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