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| | | | Joined: Mar 2005 Posts: 86 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 86 | Hi All,
I have been reading Chilton Repair Manual in my spare time and have a question that has always bugged me:
What is the definition of a "turn" in degrees?
Is one full turn 360 degrees or 180? Half a turn 180 degrees or 90? A quarter turn 90 degrees or 45?
For instance, in setting the idle speed on a Rochester BV carb, "Turn the idle screw slightly to seat, and then back out 1 1/2 turns" ... "adjust the mixture screw to obtain a 20 rpm drop, then back out screw 1/4 turn". On hydraulic valves, "when all play has been removed, turn the adjusting nut in 1 full turn"
When I turn a screwdriver, wrench or ratchet I consider one physical turn equal to 180 degrees. Am I totally offbase on this? Any input? Am I thinking too hard on this subject? Thanks!
Last edited by JC; 01/10/2008 3:50 AM.
JC in KC
"The future will be better tomorrow." Dan Quayle
1965 Chevy C10 Long Fleetside
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | 1 full turn would be 360 degrees.
Bill Burmeister
| | | | | Joined: Oct 2005 Posts: 4,261 "Hey! I sound like Darth Vader!! | | "Hey! I sound like Darth Vader!! Joined: Oct 2005 Posts: 4,261 | Think of that screw having a mark on one side. Turn it 180 degrees and the mark will now be on the opposite side of where it started. So, in order to get a full turn, 360 degrees, you have to start from where the mark is and bring it around fully to end where it began. One full turn. | | | | | Joined: Dec 2007 Posts: 1,403 'Bolter | | 'Bolter Joined: Dec 2007 Posts: 1,403 | This is math. 180 is a line. Think of 360 as a full circle. | | | | | Joined: Mar 2005 Posts: 86 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 86 | Thanks for all the input. I've done a lot of math in my time and also a lot of survey work dealing with degrees, radians, azimuths etc., but never seen any reference to a "turn" vs. degrees. Thanks for clarifying this.
JC in KC
"The future will be better tomorrow." Dan Quayle
1965 Chevy C10 Long Fleetside
| | | | | Joined: Jul 2006 Posts: 707 Shop Shark | | Shop Shark Joined: Jul 2006 Posts: 707 | "Dude! He did, like, a total 360 and got pointed the other way."
Oh no, he didn't. Why do they keep saying that?
Last edited by hotshoe36; 01/13/2008 3:25 AM. Reason: none, really. Just mean-spiritedness, if that is a word.
1951 3800 Be the change you want to see. -hotshoe
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