Quick Alignment Checks Without a CMM

When you need a fast alignment check on the shop floor, a surface plate and a dial indicator are your best friends. Set the part on the plate, zero the indicator on a reference surface, and sweep across the feature you care about. Any runout or taper shows up immediately on the dial. This catches gross errors in minutes.

For checking perpendicularity or straightness without a CMM, use a precision square or a cylinder square. Place the square against the surface and look for gaps. A thin feeler gauge can size any gap you see. If the gap is consistent along the length, you likely have a taper or angle error.

When checking hole-to-hole alignment, don't overcomplicate. Insert a snug dowel pin into each hole, then measure across the pins with a caliper or micrometer. Subtract one pin diameter from the reading to get the true center distance. Repeated readings at different depths can also reveal if the holes are parallel.

A final trick is the flashlight test. Hold a known straightedge against the joint or surface and shine a bright light from behind. Light bleeding through shows misalignment. This is coarse but perfect for a quick go-no-go decision before you move to a CMM.

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