ACU-RITE ENC 250 Referenzhandbuch - Seite 7

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ENC 250

™

MULTI-SECTION

End to end distance must be

xx40mm ± 2mm

• Check for proper spacing between sections. Using a tape

measure, record the over all length of the mounted scale

sections (no end caps). Convert the length to millimeters

by multiplying by 25.4. If the sections are mounted

correctly, the last two digits of your measurement should

be very close to 40 mm; (e.g. 6640 mm, 8040 mm, 10840

mm etc.). If this distance is off by more than two

millimeters from nominal (e.g. 6637 mm, 6643 mm) shift

the location of the right end section to bring it within the

nominal distance.

Scale face alignment

• To align the front face of the scale case to the axis travel,

first locate the high point. This is the TIR point furthest

away from the mounting surface along the axis travel.

Example:

high point

• Loosen the next two fasteners to the right of the high point.

• Move indicator to the first hole location, insert two M3 x 25mm

SHSS (leveling set screws).

• Use the leveling screws to align the face to within [.012"]

.3mm to the high point along the axis travel and secure the

fastener.

• Move indicator to the next hole location, then loosen the

next fastener to the right. Align this location to within

[.012"] .3mm. Continue alignment with the remaining

fasteners.

• Return to the high point, and use the same procedure

working out to the left end.

Run an indicator along the front

face to locate the high point.

Mark the location, and set the

indicator to 0.000" [0.0mm]

Loosen next two

fasteners

• Recheck the scale face alignment at a second location to

insure the encoder is parallel. Use the leveling screws for

further alignment if necessary.

Top surface

• Following the face alignment procedure, the top alignment

must be rechecked. Follow the previous steps placing the

indicator over each mounting hole.

Dowel pin anchoring ...

• Drill a [.302"] 7.7mm diameter hole through the dowel pin

hole locations at each end of the scale case [3/8"] 9.5mm

deep.

• Use a [.312] 8mm reamer to provide a press fit.

• Insert the dowel pins at each end, with the threaded hole

facing outward.

Suggested second location

Suggested first location

Move the indicator to a different

location on the face of the scale case

[5/16"] 8mm Dowel

Threaded hole

Scale case holes are undersized to

insure accurate centering.

Pin (2)

Acu-Rite Companies Inc.