T.E.A. Transmissions introduces the new Extra Strong Rack drives (ESR)
from HepcoMotion designed to simplify heavy lifting applications.
Cartesian gantries used in heavy lifting applications often require two
Z axes linked together, with two racks fitted to the structure separately to
provide sufficient lifting force. Though a single larger rack could be
considered, it would also mean a larger rack module size and a correspondingly
bigger pinion to match.
HepcoMotion’s ESR rack has been specially developed to address this
issue by achieving a high lifting capacity in a limited amount of space. Combining
high quality materials with an advanced manufacturing process to provide a
single rack drive capable of 5000N lifting force, the ESR rack can be
configured in double arrangements for particularly heavy loads.
Similar to the guides from the Hepco Heavy Duty HDS2 system, the rack is
integral with the V guide, ensuring excellent parallelism with the V guide
running surface offering smooth motion over the entire travel length. The time
saved from not having to set two components parallel when a separate rack and
guide are used, is an additional benefit.
The guide size with the advanced ESR product is slightly thicker than
the standard HDS2 guide with a mod 5 hardened rack cut over a 28mm face width. The
controlled hardening process contributes greatly to the capacity obtained
together with high precision rack machining ensuring accurate pitch error
control. Rail lengths produced as standard are less than two metres with longer
lengths achieved by butting.
The whole package is complemented by a hardened and ground 15-tooth
pinion that can be easily fitted into standard HDS2 carriage plates. The design
enables a geared motor/flange arrangement to be located directly to the
carriage, taking up minimal space.
ESR guides are normally used with HDS2 beams HB25C or HB25 for
simplicity and cost benefits. Both beams are the default choice for Z axes in
XYZ gantry designs produced by Hepco.
V bearings to suit can be selected from 64, 95 and 120mm diameters
depending on any offset or twisting load conditions. A standard lubrication
facility is available for both rack and V guide running surfaces providing a
long and trouble-free service life.