Archive for September 2, 2022

Equatorial Mounts With Stiction, and How to Fix: What is Stiction?

September 2, 2022

Stiction: Physics = “The friction which tends to prevent stationary surfaces from being set in motion”

I have an older Meade “medium duty” equatorial mount.  It’s been a while since I’d last used this mount. Unfortunately, while pointing the telescope, the RA and Declination shafts were “jerky” or sticking, when attempting to hand-move the mount. This is called “stiction.”  

This mount has teflon/nylon split bearings, and over the past 30 years, knowing that a petroleum based lubricant can attack plastics, nylon and teflon, I have disassembled and used paraffin.

It occurred to me to use some Mobil 1 synthetic motor oil in a tiny plastic dropper, might just be the perfect lubrication. 

I removed the counter weights, and flipped the RA and Dec shafts in all angles, and dripped small drops of Mobil 1 synthetic into the RA and declination lock down holes, which would allow permeation of the internal surfaces. 

The Meade Medium Duty mount seems to now work beautifully.