ACME Threaded Rods

vendredi 2 janvier 2015

The problem:



The threaded rod and threaded block that moves the power seat on my Expedition has issues. There is a fair amount of play that is a concern. From what I understand, the threaded rod is an 'ACME" thread (trapezoidal cut). My thought is that I can get a thread repair kit and just drill the block and install the inserts. What I do not know is how these threads work, how the kits work and what the sizes are. From what i can tell, until I get it completely apart, the outer diameter is about a 1/3 of an inch, and the inner diameter is about 1/4 of an inch. I think the rod is threaded at 13 threads per inch, but can only find a reference on the web to 12 per inch. It sucks measuring through the little slot.



If it were a finer thread, i would say helicoil. But these look special and I need a really coarse thread at a relatively small diameter.



This is also not something I know a damn thing about. Any machinists, machinery or mechanical engineers out there?



Thanks in advance.




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