Bolt Holes – Size matters!

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Bolt Holes – Size matters!

By Steve Gordon on April 28, 2016, Vibralign

I was asked to help a customer align a 500HP Motor / Blower. The new motor came in on a skid, was lifted into place with a crane, new electrical boxes fitted and coupling put into place. Now the easy part, the precision shaft alignment!

Bolt Holes 1

We took two sets of measurements which repeated. Made one small shim correction (The motor was roughed in using the old shims which were in good shape). Using the Verti-Zontal technique we then went after the horizontal correction. While moving the motor with the horizontal jack bolts we ran out of room! We were bolt bound. How can that be? The old motor wasn’t.

Bolt Holes 2 Bolt Holes 3

What has changed? The motor. Upon further inspection the new motor has bolt holes 1” diameter. The old motor has bolt holes 1.25” diameter.

The motor had to be uncoupled, electrical removed, lifted, bolt holes enlarged and then reassembled. One day’s work, what an aggravation! I’ve been involved in machinery alignment for almost two decades and I didn’t have that one filed in my head as one of the pre-alignment checks. I do now…

As it turns out, the precision shaft alignment is again the quick and easy part. 30 minutes.

Bolt Holes 4

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  • By Brad Case

    Simple items that can cause unexpected results, non-repeatability, and soft foot issues.

    Over the years we have fielded several technical support calls from maintenance personnel having repeatability and soft foot issues (during an alignment) all of which had a common issue; other influences. Meaning not the typical looseness, coupling backlash, soft foot issues.
    During the “heat of the battle” to get the precision shaft alignment job finished it is easy to overlook simple items th

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