DescriptionDifferential adjuster from patent 585184 fig 1, 2.png
English: Exterior and cutaway drawing of
micrometer adjustment mechanism from US patent 585184[1].
Legend 1- Main barrel 4- Adjusting rod (a tab on the rod, not shown, fits into a slot on the barrel to prevent them from rotating relative to each other; they are confined to sliding in and out) 10- Female screw cut into tube1(orange); the example uses a right hand, 20 threads per inch (tpi) pitch 11- Male screw cut onto rod4(blue); the example uses a right hand, 25 tpi thread 12- Sleeve cap or
thimble 12x-Milled bead on thimble 13- Nut sleeve with, for example, outer 20 tpi threads (orange) and inner 25 tpi threads (blue); fixed attachment to sleeve cap12 14- Beveled end of sleeve cap with ruler markings to show rotational movement
Each full rotation of the thimble + nut sleeve,12+13, moves the rod 0.01 in (0.25 mm) relative to the main barrel due to the
differential motion from the 20 tpi and 25 tpi threads.
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