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ST-30 Gearbox Non-Contact Encoder Upgrade Kit

Service Home How To Procedures ST-30 Gearbox Non-Contact Encoder Upgrade Kit
Recently Updated Last updated: 03/04/2020

ST-30 Gearbox Non-Contact Encoder Upgrade Kit


This procedure is for service kits 93-2946 (FLD UPGRADE KIT ST-30 GBOX NCE 10" CHU) and 93-2983 (FLD UPGRADE KIT ST-30 GBOX NCE 12" CHU). The only difference between the kits is parameters based on chuck size. Please be sure to verify the kit is correct for your machine.

AD0442

ST-30 Gearbox Non-Contact Encoder Upgrade Kit

- Jump to Section - 1. If Applicable: Upgrade Motor Mount Plate (3 steps) 2. Install 3" Non-Contact Encoder (1 step) 3. Install Spindle Home Switch (3 steps) 4. Wiring and Software (3 steps) Back to Top

If Applicable: Upgrade Motor Mount Plate

1

  • If the exisiting plate is machined without holes for the 3" non-contact encoder mount: plate [1], then you need the upgraded plate [2]. that's included in the kit
  • If your machine already has plate [2] you can skip to the next section.  Otherwise follow the next steps for installation.

2

  • Break loose gearbox motor mount screws [1]
  • Loosen belt tension block screws [2]
  • Remove the spindle drive belt
  • Use lift hooks secured with hex nuts on the rear studs of the motor [3]
  • Use a lift hook secure on the motor mount plate center slot [4]
  • Float the motor and remove the gearbox motor mount screws [1]

3

  • With the motor [1] securely on the floor remove the screws that secure the motor plate [2] to the brackets
  • Remove the belt tension blocks for installation onto the new plate
  • Install the new motor mount plate
  • Install the belt tension blocks to the plate
  • Install the motor to the machine reverse of removal
  • Refer to Haas Torque Specifications
  • Leave the belt off until you have installed the new spindle home switch

Install 3" Non-Contact Encoder

1

  • The non-contact encoder (NCE) ring mount hub [1] is aluminum and sweat fit to the output of the motor shaft
  • Heat the NCE ring mount hub on a hot plate to 220° F
    • Use heat resistant gloves
  • Install to motor shaft quickly
    • Press the hub onto the shaft and hold
    • Ensure it grips and seats square before releasing
  • Wait for the hub to cool to room temperature
    • Skip to installing the home switch while the hub cools down
  • Use T-0103 [3]  (RING MOUNT FIELD INSTALL TOOL ST-30 GB) to install the non-contact encoder ring [2] to the hub [1]
    • Tighten each of the 4 screws evenly, in a pattern, to bring the ring down square with the hub
    • Remove the tool when finished
  • Install the encoder read head spacer [4] and read head mount [5] to the motor mount plate
  • Install the NCE read head [6] being sure to use (2) WASHER FLAT 0.170ID X 0.400OD before installing read head mounting screws. Use the provided shim to set the gap between the ring and the read head.
  • Torque all screws per the Haas Torque Chart

Install Spindle Home Switch

1

  • Lock the spindle
  • Break loose the hydraulic union [1] screws
  • Remove the hydraulic union and drawtube assembly
    • Note orientation of clamp/unclamp hoses before disassembly
    • Do not over tighten union drain hose when re-installing
    • Do not impact the hydraulic union. Use caution when removing and installing. 
  • Note: If your machine has a C-Axis, refer to Hydraulic Cylinder - C-Axis Motor - Brake Caliper - Rotor - Replacement - ST - DS for removing the C-Axis motor to get the brake disk off
  • Remove the union adapter [2]
    • Note: Union adapters after 11/2018 have a sweat fit
    • Please reference ST Hydraulic Union and Spindle Adapter Replacement Guide
  • Remove the spindle sprocket [3]
  • Remove the 6" NCE ring and read head assembly [4]
  • Remove the read head mount [5]

2

  • Install the new spindle home switch sensor ring [1]
    • Not to exceed (NTE) 0.001" total indicated runout (TIR)
  • Install the spindle home switch [2] to the switch mount [3]
  • Install the home switch mount [3] 

3

  • Installation is reverse of removal but you must indicate each component in to the following TIR in the locations shown:
    1. Spindle Sprocket: 
      • Radial Runout: NTE 0.001" TIR [1]
      • Axial Runout: 0.0005" TIR [2]
      • Install the drive belt
    2. Hydraulic Union Adapter: 
      • Radial Runout: NTE 0.001" TIR [3]
      • Axial Runout: NTE 0.0005" TIR [4]
    3. Hydraulic Union: 
      • Radial Runout: NTE 0.0005" TIR [5]
  • Adjust belt tension using the belt tension blocks
    • See belt tension chart
    • Rule of thumb: Belt should not twist more than 90° when rotated by hand
    • Once set torque the screws while securing the nut on the bottom of the block
  • Torque the motor mount plate screws
  • Re-check belt tension and verify it remained the same

Wiring and Software

1

  • Remove the old non-contact encoder cable
  • Install the new cable to the same port and trace back along the same path
  • Connect the dual port cable to the new 3" NCE and the spindle home switch
  • Secure with cable clamps as seen in the photo

2

  • Login to the HAAS SERVICE PORTAL.
  • Download the new configuration file.
  • Load the configuration file to the control.  Refer to the NEXT GENERATION CONTROL - CONFIGURATION FILE - DOWNLOAD/LOAD procedure.
  • If the machine has a C-Axis you will need to refer to C-Axis - Engagement Offset and C Axis - Gear Mesh Contact - Load Adjustment - ST - SL

3

  • Slowly run the spindle from 1% of max RPM up to 100% max RPM
  • Stop the spindle if there are any unusual noises from the C-Axis gears or belts.  
  • Verify spindle passes vibration 
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