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Spline Gages ???? What?

cheesiechanman
Good Morning ladies and gents,

For those of you who have ordered Go/Nogo gages for splines... how do you confirm they are made correctly? Do you all have any information you can pass along to help me understand how to compare customer print with gage maker go/nogo print? I don't know a whole lot about spline gages or splines in general and would like to understand them a little better. I attached the part print for the spline of the part. Now how would i take this and determine the sizes/specs of a Involute spline go and nogo gage.ConfusedConfusedConfused

Thanks in advance



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  • My company is a precision gear/spline manufacturer

    Our customers will state an AGMA or ISO spec that the spline shall conform to. We copy & paste that requirement into PO.

    We then purchase a gage from our 17025 Accredited facility & they send along with it a c-of-c that says it conforms to the spec on our PO.

    We WILL NOT (nor DO WE WANT) to be in the business of telling a gage manufacturer how to make a gage.

    If gages worked and all of a sudden they're binding up, it is now time for re-certification. Gages will wear quickly due to the types of materials being used (especially ones with a tight fit)

    First- essentially you are going off of the assumption that it is correct because the P.O. stated the print spec and applicable standard and the manufacturer provided a cert of calibration saying it does.

    How do I convince others that is enough? Also, I have a hard time fully swallowing that myself. I don't want to tell them how to make the gage. I just want to confirm that we are checking our parts at the proper limits. Ya know?

    Second- The parts have changed. 100%. You would think that would be enough to convince them. We have a 3 pin method to check the parts and it shows them smaller than before. However, we also have a press fit shaft that we use on a force tester. This shaft is labeled "max" from the customer stating its the max size of the shafts they use. It slides right through. But our go gage stops about halfway through and requires some force to push it the rest of the way. So they assume that means the go gage is wrong.... I tried to explain that they are two different sizes and geometrically different however.... no dice.
Reply
  • My company is a precision gear/spline manufacturer

    Our customers will state an AGMA or ISO spec that the spline shall conform to. We copy & paste that requirement into PO.

    We then purchase a gage from our 17025 Accredited facility & they send along with it a c-of-c that says it conforms to the spec on our PO.

    We WILL NOT (nor DO WE WANT) to be in the business of telling a gage manufacturer how to make a gage.

    If gages worked and all of a sudden they're binding up, it is now time for re-certification. Gages will wear quickly due to the types of materials being used (especially ones with a tight fit)

    First- essentially you are going off of the assumption that it is correct because the P.O. stated the print spec and applicable standard and the manufacturer provided a cert of calibration saying it does.

    How do I convince others that is enough? Also, I have a hard time fully swallowing that myself. I don't want to tell them how to make the gage. I just want to confirm that we are checking our parts at the proper limits. Ya know?

    Second- The parts have changed. 100%. You would think that would be enough to convince them. We have a 3 pin method to check the parts and it shows them smaller than before. However, we also have a press fit shaft that we use on a force tester. This shaft is labeled "max" from the customer stating its the max size of the shafts they use. It slides right through. But our go gage stops about halfway through and requires some force to push it the rest of the way. So they assume that means the go gage is wrong.... I tried to explain that they are two different sizes and geometrically different however.... no dice.
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