Quick Thread Pitch Inspection with an Optical Comparator

For fast and accurate inspection of external threads, an optical comparator is hard to beat. Unlike contact tools, it does not deform the part and gives you a clear view of the thread form. You can measure pitch, major diameter, and flank angles without any special fixtures.

To measure thread pitch, place the threaded part on the work stage and align it perpendicular to the light beam. Start with a low magnification to find the thread, then zoom to 20x or 50x for better resolution. Use the screen protractor to set the baseline along the thread axis, then move the stage from one crest to the next. The digital readout gives you the pitch directly.

For best results, use a flat edge or a knife-edge to locate the crests precisely. If the part is shiny, reduce the intensity to avoid glare. Always verify your reading with a thread plug gauge on a sample part before trusting the comparator for production runs.

Remember, the comparator is a comparison tool. It works best when you have a known good part or a drawing with overlay. Store your overlay charts for quick pass/fail checks. This saves time and reduces measurement variability in the QC room.

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