I have seen similar issues to Dana's and have told myself it must be torque left in the gear-train within the pot. Maybe all in my mind as well, but it seems real to me on some equipment.
-Brian, WA1ZMS > On Dec 24, 2017, at 5:26 PM, Dana Whitlow <k8yumdoo...@gmail.com> wrote: > > I think I need to clarify what I mean by "backlash". It is not simple free > play in > the adjustment mechanism- it is something much more irritating, as follows: > > I sneak up on the desired result, but manage to overshoot slightly. So I > back > off on the screw, and find that at first the result continues to change in > the > *original* direction (making the overshoot even worse) for a bit before > finally > reversing as I wanted it to. This behavior is not conducive to having a > good > time making critical adjustments, nor does it lend any confidence in the > stability > of the adjustment in the face of handling. > > Dana > > > On Sun, Dec 24, 2017 at 4:06 PM, Charles Steinmetz <csteinm...@yandex.com> > wrote: > >> John wrote: >> >> I didn't really notice much backlash, though when setting oscillators I >>> try to approach (slowly) from one direction until it's "good enough" and >>> then stop, to avoid that problem. >>> >> >> The hot tip is not to just "sneak[] up on the sweet spot and then walk[] >> away," as Dana put it. >> >> Anytime you have an adjustment with some hysteresis (classic example is >> setting a d'Arsonville movement to zero), you want to sneak up to the >> perfect setting and then run the adjuster *back* the way you came just a >> touch, to leave the adjusted part on its own without any mechanical >> connection to the adjustor mechanism. Such contact is almost always the >> culprit if the adjustment drifts after you set it. >> >> This takes some "feel" for the motion of the adjuster mechanism, but it is _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.