![]() I've tried looking for dimensional data on brake cam shafts on semi-trucks/trailers but haven't found anything worthwhile. The load cycles will be very low for this application as it is not a rotating assembly like a motor/pump. The splined length of the slack adjuster is 1.00'. The slack adjuster can apply ~2,300 lb*ft of torque max to the shaft. I don't believe the application is severe. 42921 Sold Out LSHT Hydraulic Motor - 15.68 in/rev - Magneto - 6B Spline - SAE Ports - CW - BMER-2-250-FS-SW-S 42921 LSHT Hydraulic Motor - 18. The method and amount of 'breaking' sharp corners and edges also depend upon the conditions and requirements of each application.' ![]() SAE J499 makes reference to the shaft dimensions, but only states the following: 'The shaft dimensions depend upon the shape and material of the parts, their heat treatment, and methods of machining to give the required fit. I can not find any references to what the external dimensions of the shaft splines should be. I have a copy of the 28th edition Machinery's Handbook, but can only find dimensional information regarding the internal splines (specifically for broached holes). The slack adjuster mates to the shaft by a 1.5' - 10C SAE spline. The slack adjuster acts as a lever arm to rotate a shaft which engages the brake pad to the rail wheel. I'm designing an air brake system for a railroad application which will use automatic slack adjusters which are typically found on over the road trucks/trailers. After several years of referencing this website, I've decided to post a question I haven't been able to find an answer to. ![]()
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