Clarification: how much is a "turn" regarding screwdrivers?

Lets assume the following:

A typical human hand turns a screwdriver 180 degrees in one motion. It takes two hand motions to achieve 360 degrees of rotation on a screw.


In these forums, when we refer to turning a screw, is one "turn" equal to 360 degrees of rotation, or equal to one motion of the hand - typically 180 degrees of rotation?

Thus, setting your mix screws to "three" turns means fully rotating the flat-head screw 360 degrees three times from the bottom. Correct?

I was helping a friend of mine fix his CB and we had a disagreement over the semantics.

 

Its one of those things that doesn't really have an answer and really depends on the person. I've always gone with 1 turn = 360 degrees. Thus 3 and a half turns would be 1260 degrees of rotation. My best friend of the other hand would call 1260 degrees of rotation 5 turns.

Consequently he too owns a CB

 

A turn would be 360.
A fraction is it's fraction- - 1/4 , 1/8 - - ETC
It has been suggested in fine tuning to think in eight degrees for the mixture screw. That is 3% of a turn. Then ride, and write down your results.

 

Tuning the Mixture Screws used to be done "By Ear"

Technology allowed for Exhaust Gas Analysis: "E-G-A"
The machines were too maintenance intensive and broke down.

Along came "The ColorTune Plug"

The ColorTune Plug will help you find the optimum "Air~Fuel Ratio" for ideal combustion to sustain IDLE.
The device allows you to see the "The Burn" at the moment of Ignition.

 

To answer your question, the turn is referring to the screw, not the human hand. So, one turn of the screw is a full revolution or 360 deg.

When I tune carbs, I will use 180 deg turns to count (2 1/2 turns = 5 x 180 deg "hand" turns). This way it's easier to get an accurate adjustment.

 

SUPPOSED to be 360* if we're all trying to actually communicate with each other.

HOWEVER it depends on who wrote the manual or instructions you're looking at; I have seen it mean 180* also which does confuse things.

I'm a "360" guy myself.

 

To me it means 360*.

I love "promo" screwdrivers that have company names on them, makes it easy to tell how much you've turned the screw.

 

Re: Clarification: how much is a "turn" regarding screwdrive

I usually use a screwdriver(tester) which has a clip at head to secure it in the shirt pocket, When i turn 360 i make sure the clip comes back where i started. Some marking on screwdriver will help i guess..