RM / RE Installation
Product installation involves the mounting of the body of the encoder and then:
- for RM products: the alignment of the magnetic actuator on the customer shaft with the body (or vice versa), or
- for RE products: the coupling of the shaft to the customer shaft.
RM22 and RM36 Encoder Installation
The RM22 is attached using the flanged face, whilst the RM36 can be screwed into its end face or by use of mounting lugs (see picture below). The alignment datums and the installation tolerances are as shown in the installation guide. The alignment datums are the outside diameter of the spigot and the bottom face of the flange. The body needs to be concentric with and square to the shaft and at the correct axial position.
RM22 mounting - using spigot and mounting flange
Mounting lugs fit into the rebate around the side of the body. These are sometimes called "Synchro Mounting Clamps" since they are common amongst synchro encoders.
RM36 mounting - using spigot and mounting lugs
Holes in the RM22 flange are for M3 screws, and the RM36 has M3 tapped holes. To achieve the necessary alignments a pair of alignment bushes could be made up and used as follows: The position of either the shaft or of the mounting surface of the encoder need to be adjustable.
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The first bush is used to achieve squareness and concentricity between the two. It has a tight fit in the mounting hole and is held in contact with the mounting surface. It is also a good fit on the shaft and the shaft needs to bottom in the bush. This sets the end of the shaft to approximately the correct position with respect to the mounting. | |
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The 2nd bush is used to set up the axial position of the actuator on the shaft. The grub screw can be tightened.
Once this bush is removed, the sensor body can be put into place and attached with screws. |
RE22 and RE36 Encoder Installation
Both the RE22 and RE36 can be mounted by screws into the front face of the mounting spigot, or can use mounting lugs (see picture below).
The RE22 uses M2,5 screws and the RE36 uses M3 screws.
If pre-alignment between the customer shaft and the encoder mounting is done, then the spigot diameters can be used and alignment should be almost perfect.
However, it is still recommended that a coupling is used between the customer shaft and the shaft of the encoder in order to allow for the remaining misalignments without the imposition of large radial or axial loads onto the encoder which will cause bearing failure and a short life.
If the mounting is done without the spigot diameter, ie only by screws, then a coupling will certainly be needed and should have additional compliance.
Couplings should be rotationally stiff but do not need to be rated for any significant torque unless the encoder is being fitted to a shaft that has very high rotational accelerations.
RE22 mounting - using front face
RE36 mounting - using front face
RE22 mounting - using spigot and mounting lugs
