• This document is a checklist meant to verify lathe alignment.  The goal is to have a common centerline between the spindle, the turret pocket, and the tailstock or sub-spindle.  You will want to check alignment under the following conditions:

1. A machine crash occurred
2. You have reports of machine errors

• Record the size of each error, in the order given. Then, correct each error to align the lathe.
• To use this document, refer to ST, DS - Alignment Check.

• Use tool T-2181

Record approximate bubble location and any change across the travel:

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• Attach an indicator as shown to the face of the turret
• Rotate the spindle 360 degrees and watch indicator movemment

Total Axial Runout on Spindle Shaft Face:

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The maximum permitted error is 0.0002" (0.005 mm)

Spindle to Z-Axis Parallelism Part 2:

• Measure the radial runout at the base and end of the alignment bar
• The maximum radial error that is permitted is 0.0002 (0.005 mm)" at each end

Radial Error Base:

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Radial Error End:

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• Measure the parallelism along the top of the bar as you jog the Z-Axis
• The maximum permitted error is 0.0004"/10" (0.010 mm / 254 mm)

Top of bar parallelism:

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• Measure the parallelism along the side of the bar while jogging the z-axis
• The maximum permitted error is 0.0004"/10" (0.010 mm / 254 mm)

Side of bar parallelism:

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Spindle Alingment Bar Service Tool Part Numbers:

• T-2113 for ST-10
• T-1312 for ST-20/30, DS-30
• T-1652 for ST-30 Big Bore, ST-40 and ST-40 Big Bore
• ST-40 Big Bore also must have Adapter T-2160 and Spacer T-2161
• T-2165 and T-2166 are necessary for ST-40/45/50/55 that have the optional Steady Rest (T-1652 is too short).

Y-Axis Square to Z-Axis

RECORD PARAMETER 700 VALUE:

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• Set the parameter 700 to zero.
• Measure the parallelism of the spindle face to the Y-Axis using the gauge block
• Record the measured error

ERROR:

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The maximum permitted error is 0.0002"/5" (0.005 mm / 127 mm)

• Set Parameter 700 back to the recorded value.

X-Axis to Z-Axis Squareness

• Measure the parallelism of the spindle face to the X-Axis using the gauge block
• Record the measured error.

ERROR:

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The maximum permitted error is 0.0002"/5" (0.005 mm / 127 mm)

Turret to X-Axis Parallelism

• Attach a magnetic base to the spindle retaining ring with the indicator tip on the face of the BOT/Hybrid [1] or VDI [2] turret
• Move the turret along the X-Axis.

ERROR:

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The maximum permitted error is 0.0004"/4" (0.010 mm / 102 mm)

Spindle Centerline to Turret

For New Generation Controls (NGC), record the following parameters:

RECORD SETTING 319 FOR VDI TURRETS in INCHES or MM:

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RECORD SETTING 320 FOR BOT/BMT TURRETS in INCHES or MM:

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RECORD PARAMETER 211 (FACTORY) for Y-AXIS EQIPPPED LATHES:

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For Classic Haas Controls (CHC), record the following parameters:

RECORD PARAMETER 254 VALUE:

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RECORD PARAMETER 254 VALUE (in inches or mm):

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For CHC Y-Axis Equipped Lathes: RECORD PARAMETER 211 VALUE:

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For CHC Y-Axis Equipped Lathes: RECORD PARAMETER 211 VALUE (in inches or mm):

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Measure the spindle centerline to toolholder concentricity with a co-axial indicator.  Reference the How-To procedures listed below for detailed steps on how to find this measurement.

POCKET CONCENTRICITY (RADIAL ERROR):

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The maximum permitted error is 0.001" (0.025 mm) for pocket number 1. For other pockets, the maximum permitted error is 0.003 (0.076 mm) .

How-To Related Procedures:

• Lathe - No Y-Axis - Toolholder to Spindle Center Line Adjustment - CHC
• Lathe - Y-Axis - Toolholder to Spindle Center Line Adjustment - CHC
• Lathe - Toolholder to Spindle Center Line - NGC

INSPECTION TOOLS:

• BOT: T-0026 for ST-10
• T-0027 for ST-20/30, DS-30
• T2171 for ST-20SS/30SST
• T-0028 for ST-40
• VDI: T-2201

Tailstock Parallelism to Z-Axis:

• Install a taper alignment tool into the tailstock
• Measure across the parallelism along the side of the bar

SIDE PARALLELISM ERROR:

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The maximum permitted error is 0.001"/4" (0.025 mm / 102 mm)

• Measure parallelism across the top of the tool [2]

TOP PARALLELISM ERROR:

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The maximum permitted error is 0.001"/4" (0.025 mm / 102 mm)

TAPER ALIGNMENT TOOLS:

• T-0016 for MT3 (ST-10)
• T-1416 for MT4 (ST-20,30 and DS-30)
• T-1733 for MT5 (ST-40)

Z-Axis to B-Axis Parallelism

• Measure parallelism across the side of the tool [1]
• Jog the Z-Axis 4 inches [2]
• Jog the B-Axis 4 inches [3]
• Do this again for the full length of the B Axis travel.

SIDE PARALLELISM ERROR:

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The maximum permitted error is 0.001" (0.025 mm)/Full Travel

• Measure across the top of the taper tool
• Jog the Z-Axis 4 inches [2]
• Jog the B-Axis 4 inches [3]

TOP PARALLELISM ERROR:

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The maximum permitted error is 0.001" (0.025 mm)/Full Travel

Tailstock Concentricity to Spindle

• Attach an indicator to the face of the alignment bar.

End of Alignment Bar Error [1]:

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Base of Alingment Bar Error [2]:

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The maximum radial error is 0.001" (0.025 mm) at each end

Secondary Spindle Parallelism to Z-Axis:

• Mount the magnetic base to the turret
• Move the indicator along T-2113
• Measure across the top of the secondary spindle alignment tool [1]

TOP PARALLELISM ERROR:

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The maximum permitted error is 0.0004"/10" (0.010 mm / 254 mm)

• Measure across the side of the secondary spindle alignment tool [2]

SIDE ERROR:

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The maximum permitted error is 0.0004"/10" (0.010 mm / 254 mm)

• SECONDARY SPINDLE ALIGNMENT TOOL:
  • T-2113

Z-Axis to B-Axis Parallelism (for Secondary Spindle)

• Measure across the top of the tool [1]
• Jog the Z-Axis 4 inches [2]
• Jog the B-Axis 4 inches [3]
• Repeat for the entire length of the B-Axis travel

TOP PARALLELISM ERROR:

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The maximum permitted error is 0.001" (0.025 mm) /Full Travel

• Measure across the side of the taper tool
• Jog the Z-Axis 4 inches [2]
• Jog the B-Axis 4 inches [3]

SIDE PARALLELISM ERROR:

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The maximum permitted error is 0.001"/Full Travel

Secondary Spindle Concentricity to Main Spindle

• Attach an indicator to the face of the alignment bar and measure the main spindle nose taper radial runout as seen from the secondary spindle

RADIAL ERROR:

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The maximum permitted error is 0.002" (0.050 mm)