Posts tagged with: machine base flatness

Flatness Measurement Repeatability, Part 2

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By on January 2, 2020

In a previous blog written by Brad Case (Sept 24, 2019), he explained how to perform a repeatability test and why it is good idea to do so. Here are few other items that have contributed to repeatability issues. 1)      The top rails were not sufficiently clean prior to taking readings. Paint was not removed, […]

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Channel Strut as a Motor Sub-base?

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By on April 12, 2018

At first thought it may sound like a good idea as the specialized fasteners in the channel make it easy to tighten the motor hold down bolts, however in reality it’s a cause for precision shaft alignment issues. Here’s why. A good pump/motor base is engineered to meet specific standards (IE: ANSI, API, etc.) with […]

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Geometric Flatness “Buck In” Procedure

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By on September 29, 2015

Sometimes simple procedures can become huge pain points, especially when the necessary knowledge is not known or available. This has proven to be true with the geometric flatness “buck in” procedure involving a sweep laser transmitter and receiver (detector). First, let me begin by defining “buck in”, this phrase is utilized to describe the process […]

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Flatness for Shaft Alignment-Revisited

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By on March 25, 2015

A reader of our blog posted a comment stating that he could not cut a step shim to correct for angular soft foot, since it was not permitted in API standards. Which, naturally, made me do two things: • Look at API Standards, because, at least in my 33 years of aligning machinery, I have […]

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