autocad rotation ... rrrr

[clicker]

It annoys me how the default for the rotation tool is counter clockwise. Does anyone else agree? Anyone know why autocad software engineers chose to make it this way?

[ReMark]

Which rotation tool are we talking about?

[clicker]

the rotate command, aka RO

 

I just always wondered why negative values produce clockwise rotations and positive values produce counter clockwise values... seems counter-intuitive to me.

[clicker]

ya , I know it's a lame thread but I'm trying to get my posts up to 10 so I can have a custom avatar :/

[ReMark]

Set it and forget it in your template and you won't have to complain again. See the Units command.

[clicker]

DUDE! thanks!

[Patrick Hughes]

I just always wondered why negative values produce clockwise rotations and positive values produce counter clockwise values... seems counter-intuitive to me.

 

It does seem counter-intuitive. Rotation is based on something called the right hand rule. If you google that and look at the image results you'll see how it applies. Essentially if you look at the direction your right hand fingers curl, that is positive direction.

 

The right hand rule is also applied to the UCS.

 

Using the right hand rule you can also easily determine if a thread is right or left hand. Place a screw down with the shank laying in a horizontal fashion. Now place you right hand over the threads - if the angle of the thread is generally the angle of you thumb it is a right hand thread. Left hand will match you left hand thumb direction.

[clicker]

It does seem counter-intuitive. Rotation is based on something called the right hand rule. If you google that and look at the image results you'll see how it applies. Essentially if you look at the direction your right hand fingers curl, that is positive direction.

 

The right hand rule is also applied to the UCS.

 

Using the right hand rule you can also easily determine if a thread is right or left hand. Place a screw down with the shank laying in a horizontal fashion. Now place you right hand over the threads - if the angle of the thread is generally the angle of you thumb it is a right hand thread. Left hand will match you left hand thumb direction.

 

I get it, that's interesting! thanks Patrick.

[ReMark]

In his book Surveying Practice by Philip Kissam the author states the transitman should read his angles in a clockwise direction. After the initial reading of 0d00'00" all angles are turned to the right, thus putting 0deg at 12 o'clock, 90deg at 3 o'clock, 180deg at 6 o'clock and 270deg at 9 o'clock.

 

Trivia: In aviation the nose of one's aircraft is said to be at 12 o'clock. The tail of the aircraft at 6 o'clock.

[Patrick Hughes]

You're welcome.

 

(It looks like I've got a problem typing you when I mean "your")

[designerstuart]

DUDE! thanks!

at least you got your avatar now ;-)

[hazardman]

isn't the angle like some sort of cartesian rule...you start at positive x-axis and angle up towards the positve y-axis (y being +90 degrees from x)?..

[clicker]

never thought of that... but I still like clockwise being positive!

[clicker]

got my avatar ... yippee!

[clicker]

In his book Surveying Practice by Philip Kissam the author states the transitman should read his angles in a clockwise direction. After the initial reading of 0d00'00" all angles are turned to the right, thus putting 0deg at 12 o'clock, 90deg at 3 o'clock, 180deg at 6 o'clock and 270deg at 9 o'clock.

 

Trivia: In aviation the nose of one's aircraft is said to be at 12 o'clock. The tail of the aircraft at 6 o'clock.

 

boo-yah! this is the way it should be

[ReMark]

got my avatar ... yippee!

 

And here I thought they upped your requirement to 12 posts.

 

Haven't I seen you hanging around the lab? You look very familiar.

[clicker]

And here I thought they upped your requirement to 12 posts.

 

Haven't I seen you hanging around the lab? You look very familiar.

 

 

haha , I'm in the CAD lab pretty much every day. Living off the crumbs of upper management.