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ST-35 - Non Contact Encoder Ring - Replacement

Service Home How To Procedures ST-35 - Non Contact Encoder Ring - Replacement
Recently Updated Last updated: 03/04/2020

ST-35 - Non Contact Encoder Ring - Replacement


ST-35 - Non Contact Encoder Ring - Replacement

- Jump to Section - 1. ST-35 - Non Contact Encoder Ring - Removal (4 steps) 2. ST-35 - Non Contact Encoder Ring - Installation (2 steps) 3. Conclusion Back to Top

ST-35 - Non Contact Encoder Ring - Removal

1

Power off the machine.

Remove the front left enclosure panel [1] to gain access to the spindle encoder.

2

Disconnect the spindle encoder cable from the readhead.

Remove the bolts [1].

Remove the readhead [2].

Remove the bolts [3].

Remove the NCE readhead mount [4].

3

Slide the halves of the T-0116 [1] around the NCE ring.

Install the shoulder bolts [3] through the cross bar [4]. 

4

Turn the bolt [1] to pull the NCE ring from the hub.

NOTE: Hold the T-0116 crossbar from rotating with the 1" open end wrench while pulling the NCE ring.

ST-35 - Non Contact Encoder Ring - Installation

1

Use the hot plate to heat the replacement NCE ring to 300°F (150°C).

IMPORTANT: Do not exceed 320°F (160°C) when heating the NCE ring. Overheating the NCE ring will cause permanent damage.  

Slip the hot NCE ring over the hub until the shoulder on the NCE ring is up against the hub.

Allow the NCE ring to cool.

Using a dial indicator measure the runout of the NCE ring and mark the high spot. The TIR must not exceed 0.002".

Install the NCE readhead mount [3] and torque the bolts [3]

Fasten the readhead [6] to the mount with use two WASHER FLAT 0.170ID X 0.400OD and two bolts [5]. Leave these bolts hand tight to set the air gap between the readhead and the ring.   

2

Align the previously marked high spot on the NCE ring with the readhead.

Use the plastic shim that came with the replacement encoder [2] to set the air gap between the NCE ring and the readhead.

Tighten the readhead mounting bolts [1]. 

Connect the spindle encoder cable.

Install previously removed enclosure covers.

Conclusion

If the machine is equipped with the C axis use the link below to reset the C axis engagement offset.

Lathe - C-axis Engagement Offset
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