MicroE 3500Si Mercury - Manual (Page 10)

Reference Section
Installation of Linear Scales
Page 8
MicroE Systems
L
0.2L 0.6L 0.2L
Benching pins
Positioning the Scale
Note: Before beginning mounting procedure, use talc-free gloves or finger cots to handle the scales.
"Benching" the scale to the system means aligning the scale by means of benching pins. Pin locations are described on the appropriate interface drawing.
Two benching pins are recommended on the long side of the scale and one at the end as shown . This is marked datum A on the interface drawing.
Position the benching pins in from either end. 20% of the overall
scale length is the recommended location from the edge. Be sure the benching pins do not extend too high in the Z direction to
prevent mechanical interference with the sensor or sensor mount. 2 1
End
Benching
Pin
Mounting the Scale
MicroE Systems' linear scales should be affixed to the mounting surface. Two different approaches are described below:
RTV around entire
outside edge of scale.
End Benching
Pin
Hard epoxy
at one corner,
this end only.
Epoxy and RTV Mounting (Recommended for best accuracy)
1 Make sure the mounting surface is
clean and dry.
Optionally, scale clamps may be used to secure the
scale while the adhesive cures. Avoid damage to
the top surface.
Side view showing
optional scale clamps
and scale. Space
clamps every 75mm
on scales over 150
mm in length.
4 Apply a hard epoxy, such as Tra-Con’s Tra-Bond 2116, to the end of the scale at the end benching pin. Apply 100% Silicone RTV adhesive
around the edges of the scale. This method allows thermal expansion from the benched end of the scale. After adhesive curing, remove
the scale mounting clamps or, if permanently installing clamps, make sure they do not interfere with the sensor or sensor mount.
3
MicroE Systems
L
2
Align the scale by placing the edges against the benching pins.
Benching pins
Scale clamp
with adhesive
Mounting clamp
Mounting clamp
Mounting clamp
Benching pins
MicroE Systems
L
2
3 1
Two Sided Adhesive Tape Mounting
Make sure the mounting surface is clean and dry. Peel the
cover paper off and place the scale above the final location.
Align the scale by placing the edges against the benching pins.
Gently place the scale on the mounting surface. Positioning adjustments
can be made until the scale is firmly pressed down. After final positioning,
push down on the top of the scale to secure it.
End Benching
Pin
Hard epoxy at
one corner,
this end only.