Runout Measurement of a shaft with screw thread

H

Harry12

#1
Who can help me to answer the following question? For our customer we need to measure the runout of a shaft with screw thread at the opposite end of the shaft. As a reference the pitch diameter of the screw thread should be used. In order to do so we need to screw the part in a fixture with a tapper female screw thread until tight.
Is this a correct method to measure? Isn’t it the same (or better) to use the outer diameter of the screw thread and clamp the part in a collet?

Rgds, Harry
 
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D

David DeLong

#2
Who can help me to answer the following question? For our customer we need to measure the runout of a shaft with screw thread at the opposite end of the shaft. As a reference the pitch diameter of the screw thread should be used. In order to do so we need to screw the part in a fixture with a tapper female screw thread until tight.
Is this a correct method to measure? Isn’t it the same (or better) to use the outer diameter of the screw thread and clamp the part in a collet?

Rgds, Harry
I am going to assume circular runout in your situation and the method you are using is correct. Take about 3 readings along the length of the simulated mating part (fixture) and report the worst reading. The pitch diameter is the effective diameter and is probably better than the major OD.
 

bobdoering

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#3
I hate when they call runout to a thread pitch diameter, but what I have done in the past is a gage fixture that the part screws into that has a round datum simulator surface which can then be chucked into a gage to determine the runout. Using the thread OD may be close if they are cut threads, but rolled threads, plated threads, etc., can provide way too much error - unless the tolerance is the broad side of a barn. It is not perfect, but that's what they get for calling out something without regard to whether it can be readily measured or not. Not uncommon...
 
T

True Position

#5
Can you guarantee the Major Diameter is running true to the Pitch Diameter? Beware of making this assumption. Check out the Rot'ex from Osborn Products.
I was going to recommend something like this. I've used Western Pegasus locking spline rings so I would assume locking thread rings exist but I didn't know a manufacturer. Unfortunately there can be long lead times on stuff like that.
 
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