• 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:

Note: Depending on the Software Version the Spindle Center Line settings may be located in the User Positions tab and not the Settings tab.

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)