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What class thread for screw actuator?

What class thread for screw actuator?

What class thread for screw actuator?

(OP)
Howdy all,

I'm reverse engineering a screw actuator used to open and close a small vent door on a air conditioning vent louver.  The thread is a 1/4-20 3 start thread with an aluminum stud and a steel trunion nut.  I'm going to need to order a tap and die set to cut these and I was wondering if I should loosen the class from 2A and 2B to 1A and 1B so that it can turn more freely even if it gets dust and dirt in it.  Is this a good idea or not?  

Thanks,

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.

RE: What class thread for screw actuator?

Only if you're planning to apply a coating with a net dimensional buildup to the aluminum.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: What class thread for screw actuator?

(OP)
No, I was thinking that I wanted more slop in the joint since this was an actuator and not a fastener.  I'll order my tap and die set as a 2A and 2B

Kirby Wilkerson

Remember, first define the problem, then solve it.

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