Having a small problem with a client over a splined coupling. Client has admitted that we are not the first vendor to have said problem!They have a motor, imported from the US, with male spline outputs designated SAE J744-22-4, SAE “B” (13T).They have a drawing for the coupling, with female splines designated ANSI B92.1 1970, FLAT ROOT SIDE FIT. CLASS 5These splines mate together, but maintaining a consistent fit is proving troublesome at clients end.
They want a consistent sliding fit, but some couplings are proving too tight. The motors have an identical output either end, but even on the same motor a coupling may fit one end but be tight on the other.After some deliberation (they sent us a motor, we sent it to our sub contractor to confirm fit - it did) it appears that there is significant variation in the spline profile on the motors.So, I'm having trouble finding specific specs for the SAE splines.
What is their relation to ANSI B92.1? Are they a looser tolerance class?
ANSI B92.1 splines are designed with tooth thickness and space width tolerances to allow a fit between mating parts with different classes. This document and other information from Parker-Hannifin Corporation, its subsidiaries and authorized distributors provide product or system. CLASS 7 FLAT ROOT SIDE FIT. Spline: ANSI B92.1 1996. SPLINE: SAE J498-B 1969.
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The SAE 'B' has the same basic dimensions as the ANSI spline called out on the drawing but beyond that I can't tell.Assuming for now that our s/c is making the coupling to spec (splines and gears are what they do), can anyone shed some light?