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Thread Inspection: An Overview of the Most Popular Methods
This method, however, provides limited results as thread gauges “only” say if the part is acceptable or not acceptable, but doesn’t provide a specific measurement. As the name suggests, ring gauges come in couples (the Go gage and the No Go gage) and use of them is very simple: if the thread is within the specifications, the Go gage will ...

General | Inspecting Spindle Runout - Practical Machinist
Off-hand I cannot think of an inspection method that would disclose all information and geometric conditions affecting spindle run-out. The best way to guarantee minimal run-out is to make sure that all manufacturing operations are chosen such that tolerance stack-up is minimized, but, as I stated above, many precision spindles are finish ...

Machine Reconditioning, Scraping and Inspection | Three plate method ...
The "Three Plate Metod" will in theory prodice perfect right angles as well as flat surfaces. The most economical path to the theorectically perfect right angles and/or flat surface is not strict rotatoion A to b, B to C, C to A but it will work if more laborious, The system more economical of effort is the "Reduction of Erroros" system best described in Chapter 21 of Charles Porters ...

Ideal method for inspecting flatness of a part feature.
I have a part that has a .005" flatness callout on one surface. the surface is roughly 7x7". There are flats on the opposite side to sit on the granite plate but not sure if there is a better way to test flatness. Is there is typical method for flatness inspection?

Machine Reconditioning, Scraping and Inspection | A strategic method ...
The method works in practice but is wastefully laborious if pursued to the bitter end. The following presumes competence in basic precision scraping, some experience in scraping surfaces to conform to references, and cast iron surface plates of roughly equal size and aspect ratio no greater than 3:2 of a design ensuring rigidity and stability.

Whitworth-three plate method - Practical Machinist
I've thought about doing the 3 plate method but if I have that much free time I need to be getting my butt out and making some sales! I don't know how much of a bottom feeder you are but I just got two 48 x 72 granites for just over $100. Precision castings are usually heat treated before final scraping. Dan

Whitworth-three plate method - Practical Machinist
It all depends what your goals are. If you want to experiment with the 3-plate method, I would strongly suggest starting with three smaller plates. If, instead, the main goal is to get your cast iron plate flat, follow Richard's advise. Regarding the 3-plate method with rectangular plates, I agree that it is not optimal.

Whitworth-three plate method - Practical Machinist
The three plate method dates to at least the 1830s and is normally attributed to Whitworth. Interferometers date from the late 19th century (Michelson of Michelson-Morely fame). Things like autocollimators date from 16th century or so, but I couldn't easily find a scheme for measuring flatness with one older than sometime in the 20th century.

CMM inspection of 3d profile tolerance - Practical Machinist
For a CMM inspection on what sounds like a similar problem we checked a number of points, each as a go/no go on the point. It was approximately a 16" long part that was a 18 degree segment of a 20" radius cylinder. From other features the centerline of the cylinder was constructed within the CMM software. Then points were taken on the surface.

CNC Machining | Spline Inspection - Practical Machinist
A common term used in the inspection of gears/splines is: "accumulated spacing error", which has a more tangible meaning (IMO). - - - Regarding your inspection items: 1-5 are given or calculated values. Major diameter is up to you since you're probably turning the shaft.