User Manual

950MD
Mill-Duty Housing
1
1080 N. Crooks Road • Clawson, MI 48017 • 800-635-0289 • 248-435-0700 • Fax [phone] • www.ametekapt.com
Series 950MD Housing
The series 950 Mill-Duty Housing (950MD) was designed for
applications where mounting a stand-alone rod style linear
displacement transducer (LDT) is prohibitive.
Potential physical damage, environmental conditions
or mounting limitations are all elements that are
involved in specifying a linear position feedback
system that will perform flawlessly for many years to
come. The 950MD housing has been designed to
eliminate all of the above problems by protecting the
LDT from physical and environmental damage such
as temperature, corrosives, shock & vibration, or
dust and debris. Additionally, the 950MD offers a
simple two point mounting scheme that can
compensate for lateral and/or horizontal movement
of the machine while in operation. Mounting bolts
are provided for both the trunnion mount and rod
ends in either standard steel or optional Stainless
Steel when specified.
The 950MD housing is also perfect for retrofitting existing
cylinders with an LDT providing a continuous position
feedback signal. The 950MD allows for a convenient way
to mount the 950MD and internal LDT parallel to the
cylinder. This eliminates the need to tear down and gun
drill the cylinder to accommodate an LDT simply for
providing position feedback that had not previously been
available.
The housing may also be of benefit in this same
configuration when you have an existing cylinder in
operation that does not allow for an easy removal of the
LDT. Old machines and even some existing machines or
newly designed machines did not take into consideration
the need for continuous position feedback. Certain
machines may require that the entire cylinder be
removed in order to replace the LDT.
The actuator contains a 1/2" spherical rod end with
approximately 1" of adjustment (length). This spherical
rod end allows mechanical movement in a horizontal
and/or vertical motion to compensate for any mechanical
slop or misalignment between the housing and machine.
A rear trunnion mount is provided for mounting either
directly in front of the head assembly or on the rear of the
head. An optional 3/4" spherical rod end can be supplied
on the rear of the unit (see drawing for details).
The back cap is supplied with threaded and plugged
holes that allow for field installation of the 3/4" diameter
trunnion mount bracket to the back cap. The trunnion
mount bracket is positioned at the point where the head
and barrel connect. A simple exchange of hardware is
all that is necessary to move the trunnion mount bracket
to the back cap and plug the no longer required bracket
mounting holes. When ordering the 3/4" rear rod end
option, the trunnion mount bracket is not supplied since it
would not be required.
The actuator rod is supported by two bearings within the
guide tube. The front piston bearing contains a wiper
assembly to keep contaminants from entering the guide
tube. The rear, or movable, bearing assembly is
manufactured from Rulon
®
. This high-temperature
polymer material provides low wear and smooth
operation.
The transducer magnet is mounted within the rear
bearing assembly. The magnet is a 1" O.D. cylinder
magnet (SD0410300). The magnet is positioned 2" from
the end of the transducer hex when the actuator is fully
retracted and 5" from the end of the transducer guide
tube when the actuator is fully extended.
The 950MD is designed to incorporate an LDT which has
a minimum 2" Null Zone and 5" Dead Band. The 951
LDT has a minimum 1.5" Null Zone and 2.25" Dead Band
standard. When specifying a 951 LDT to be used in a
Mill-Duty Housing, you must specify a 2" Null Zone and
5" Dead Band minimum to ensure mechanical and
electrical compatibility.