To measure a spindle for a hub, you typically measure its diameter at key points to determine the correct hub size. One common and accurate method involves using a micrometer to obtain a precise measurement.
Essential Measurement Tool: The Micrometer
As demonstrated in the provided reference, a micrometer is an effective tool for measuring the diameter of a spindle.
- Using a Micrometer: Place the spindle between the anvil and the spindle of the micrometer. Carefully close the micrometer until it is snug against the spindle, and then read the measurement on the sleeve and thimble.
- Example Measurement: In the reference, using a micrometer on the spindle yielded a measurement of 1.375 inches, which is equivalent to inch and 3/8.
Key Spindle Measurement Points
While the reference focuses on one measurement point, it's crucial to understand that multiple diameters on a spindle are typically measured to ensure proper hub fitment. These points correspond to where the bearings and seals seat.
- Inner Bearing Journal: Measure the diameter where the inner bearing cone sits.
- Outer Bearing Journal: Measure the diameter where the outer bearing cone sits.
- Seal Seat Diameter: Measure the diameter where the grease seal rides.
Recording these specific measurements is vital for selecting the correct hub with matching bearings and seals.
Alternative Measurement Tools
Besides a micrometer, other tools can be used, though they may be less precise:
- Calipers (Digital or Dial): Can also measure external diameters accurately.
- Measuring Tape or Ruler: Not recommended for spindle measurement due to lack of precision required for bearing and seal fits.
Using a precision tool like a micrometer or caliper is essential to get the exact diameters needed for a proper hub fit.
Spindle Measurement Summary
| Measurement Point | Tool | Example (from Reference) | Purpose |
|---|---|---|---|
| Spindle Diameter | Micrometer | 1.375 inches (1 3/8") | Determine hub/bearing size |
| Inner Bearing Journal | Micrometer/Caliper | (Not shown in reference) | Fit inner bearing |
| Outer Bearing Journal | Micrometer/Caliper | (Not shown in reference) | Fit outer bearing |
| Seal Seat Diameter | Micrometer/Caliper | (Not shown in reference) | Fit grease seal |
By accurately measuring the spindle's diameters, particularly using a micrometer as shown in the reference, you can correctly identify the necessary hub kit components, including bearings, seals, and the hub itself.
