Nexen HGP25 969053 - Manual (Page 6)

FORM NO. L-21277-B-1213 6
r
ack
r
equirementS
• CAUTION Handle the rack with care; it is a high precision product. Do not drop it, allow anything to fall on it, or
place it on non-flat surfaces that could affect rack straightness. Doing so may negatively affect RPS performance.
• Five sides of the RPS rack are reference surfaces. The side displaying the part number, or ends that have been
cut (not factory full or half sections) are non-reference surfaces. The side displaying the part number should not be
mounted against the machine bed and cut rack ends must be positioned at the end of the run.
• Secure the rack using all of the available mounting holes to a precision step in the machine bed. Refer to Table 2 for
proper fastener tightening torque. This will ensure the highest degree of rack stability and precision performance.
• Install the RPS at the temperature at which it will be used to minimize thermal expansion or contraction affecting the
positional accuracy of the system.
• The RPS rack is hardened on the tooth faces only.
• Nexen offers rack sections in lengths of up to one meter long. When joining multiple rack sections, a special alignment
tool is strongly recommended and available from Nexen. The alignment tool’s primary purpose is to ensure proper
pinion meshing and system accuracy over rack joints. The alignment tool is simply a spacing jig and can be manually
seated to establish the spacing of a rack joint, see Figures 9 and 10 for details.
• Avoid mounting the rack with the teeth facing up, as debris could collect on the rack and interfere with the meshing
of the RPS. If the rack must be mounted with the teeth facing up, shield the RPS from debris or install an air knife
on the moving carriage just ahead of the pinion.
HGP r
equirementS
• The HGP can be mounted in any orientation, however must meet the recommended mounting specifications found
later in this document.
• The pinion roller bearings are sealed, however it is still recommended that the pinion body be shielded from liquids,
dust, and debris.
• The HGP can be operated such that the pinion remains stationary while the rack moves as it travels along a linear guide
system. In this scenario, the supporting structure and guide system are still required to be within the specifications
found later in this document, to ensure that proper preload and system performance.
• There are two pilot options on the HGP product. If using the primary mounting pilot the product can be mounted
directly to the machine frame or pre-loader. If the secondary mounting pilot is desired, it will require a transition plate
as shown below.
SECONDARY
MOUNTING
PILOT
PRIMARY
MOUNTING
PILOT
Figure 1
SECONDARY
MOUNTING
PILOT
FRONT MOUNT ADAPTOR RING
Figure 2