Probe Mount and Master-Ball Target Details

Spindle Analysis TechNote LT03-0013

Summary

Dimensional detail, care instructions, and eccentricity adjustments for master-ball targets.

Care of the Targets

The targets used with the Lion Precision Spindle Error Analyzer are precision components which require special handling. Precautions are similar to those used when handling gage blocks.

Avoid touching the master ball surfaces (or gage pin surface) with bare hands. If the targets are touched and stored without proper care, it is possible for a fingerprint to become rusted onto the surface. In many cases, this damage cannot be repaired.

Steps for using a precision target:

Remove the target from its protective case
Remove the cloth cover from the target
Wipe target with dry, clean cloth to reduce oil film thickness
Mount the precision target onto the spindle

TAKE CARE TO AVOID TOUCHING THE TARGET SURFACE

When finished using the precision target:

Apply a thin coating of light oil, such as gage block cleaner/lubricant to the target surface
Place the cloth cover over the target
Place the target back into its protective case

These simple precautions will keep your precision targets clean and free from rust.

Target Dimensions

1" Diameter Single Ball

Maximum speed (runout < 25µm, 0.001") : 60,000 RPM
Maximum roundness error: 50nm, 0.000,002"

0.5" Diameter Single Ball

Maximum speed (runout < 25µm, 0.001") : 120,000 RPM
Maximum roundness error: 50nm, 0.000,002"

1" Diameter Dual Ball

Maximum speed (runout < 25µm, 0.001") : 6000 RPM
Maximum roundness error: 50nm, 0.000,002"

20mm Gage Pin, Dual Surface

Maximum speed (runout < 25µm, 0.001") : 80,000 RPM
Maximum roundness error: 75nm, 0.000,003"

0.125" Gage Pin

Maximum speed: 300,000 RPM

1" Diameter Spare/Replacement Ball

Maximum speed (runout < 25µm, 0.001") : 60,000 RPM
Maximum roundness error: 50nm, 0.000,002"

Eccentricity Adjustments

Eccentricity adjustments are different for different master target models.

1" Diameter Dual Ball

Inner Ball

Adjust the inner ball (closest to the spindle nose) first.
Loosen six clamping screws.
Two adjustment screws are in each axis. Moving the ball's center point requires tightening one adjustment screw after loosening the opposing screw. When the eccentricity is correct, tighten the opposing screw.
The ball's center of rotation will move in the same direction as the movement of the adjustment screws (see illustration below).

Tighten opposing radial screws and six clamping screws after adjustment of inner ball.

Outer Ball

The outer ball is adjusted with the same procedure as the 1" Diameter Single Ball on the next page.

1" Diameter Single Ball

Two radial adjustment screws are in each axis. Moving the ball's center point requires tightening one adjustment screw after loosening the opposing screw. When the eccentricity is correct, tighten the opposing screw.
The ball's center of rotation will move in the opposite direction as the movement of the adjustment screws (see illustration below).

0.5" Diameter Single Ball

The 0.5 " Diameter Single Ball consists of the ball on a shaft, and a mounting collet. The shaft is not centered on the ball, and the mounting hole is not centered in the collet. By rotating the position of the ball in the collet, the eccentricity is changed (see below).

Probe Mount (Nest) Dimensions

probe mount dimensions