This document contains the Displacement (MIL) and Velocity (in/s) vibration tolerances for lathe spindles. Refer to following procedures for spindle Vibration Analysis instructions:

1. Vibration Analysis - RS-232 Interface. For use with a vibration analyzer that has an RS-232 interface.
2. Vibration Analysis - Ethernet Interface. For use with a vibration analyzer that has an Ethernet interface.

Note: Each interface has different software and Cycles Per Minute (CPM) ranges. You must take more measurements if you use the Ethernet interface.

Observe the Displacement Plot (MIL) within the correct CPM range depending on the type of vibration analysis interface you are using per the table below. Check the tolerance based on spindle type as shown in the table below.

Observe the Velocity Plot (in/s) for the following CPM ranges depending on the vibration analysis interface you are using.

The tolerance for all lathe spindles is as follows: 

• No more than a total of 3 spikes to exceed .005 in/sec across all CPM ranges (30,000 - 213,000 CPM) or (38,452 - 230,713 CPM) depending on the interface.
  
• The CPM ranges for each interface are listed in the table below.  Take a screenshot for each range when performing a test.

The image below shows the Vibration Displacement plot for a TL-1 with a max speed of 2,000 RPM.

The CPM range is 0-33,000 CPM.

Look at the spike at the maximum RPM.

In this case, the spike is under 0.05 MIL.

The spindle passes the Vibration Displacement test.

The image below shows the graph for Vibration Displacement for a ST-10 spindle with a max speed of 6,000 RPM.

The CPM range is 0-33,000 CPM.

Look at the spike at the maximum RPM.

In this case, the spike is under 0.08 mil.

The spindle passes the Vibration Displacement test.

The images below show the Vibration Velocity plots for a DS-30SS 4,800 RPM spindle.

In this case, there is only one spike that is over 0.005 in/s between 20,000 and 210,000 CPM.

Thus, the spindle passes the Vibration Velocity test.