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Coordinate system vs compound angled planes

Coordinate system vs compound angled planes

Coordinate system vs compound angled planes

(OP)
Did a search but did not find what I am looking for.  In a solid, I would like to create a cutout (say round hole) at a compound angle...say 10deg from xy and 10deg from xz.  I created a sketch line in xy..then attached a coordinate to it's endpoint.  Then edited the angles of the coordinate system...10deg, 10deg.  I made a simple round cutout with it's centerpoint attached to the origin....now...if I measure the angle of the cutout in draft from the top and side view I get 10.000deg from the top and 10.151deg from the side..???

I then tested the same problem using two angled planes.  I noticed the same problem, however, the order in which the two angled planes are created determines in which view I will measure 10.151deg....

I also created these cutouts starting at the same origin and extended them in opposite directions to make sure of what I was measuring the top and side views....the two cutouts were not co-linear...

any ideas??

Regards,
dtctx  

RE: Coordinate system vs compound angled planes

Hi,

hmm, you are measuring one angle between two lines that do
not coincide therefore the angle will be .15 larger and
.15 smaller.

Put a coordinate system in an empty file just on the 0,0,0
point and specify the angle for x and y to be 10 degrees
Now look at the top (x/y plane) Note the deviation of
the Z-axis and the X-Axis of your coordinate system.
This is due to the fact that either rotation turns an already
'slanted' coordinate sytem about an additional axis. All
axis/planes, however must be perpendicular to each other

Hope I got the explanation the correct way. I have no ideas
how to measure the correct angle -- your cutout, however,
is OK.


dy

RE: Coordinate system vs compound angled planes

dy explains very well what is going on.  You are rotating 10 degrees about an axis that has already been rotated 10 degrees.  If I understand correctly, you want to rotate 10 degrees relative to the global axis.  To do that, you are going to have to piece-meal things together.

Start with a plane that is angled by 10 degrees.
Draw a sketch on that plane of a single line that is at a 10 degree angle relative to your other "global" datum.
Create a plane normal to that sketch line and create the hole on that plane.

--Scott

http://wertel.eng.pro

RE: Coordinate system vs compound angled planes

/Edit

or try this:

using function 'plane by 3 points'. Sample

- on the x/z plane sketch a line of arbitray length
  from 0,0 at an angle of 10
  
- repeat the above but now on the xz plane

- function plane by 3 points
  - endpoint of one line (where both lines 'meet')
  - opposite endpoint of that line
  - far endpont of second line
  
Now you have a plane to draw on an your cutout will measure
an angle of 10 regardless from which side you view it

dy

RE: Coordinate system vs compound angled planes

(OP)
Thank you everyone.  Just as DY mentioned, the second angled plane is not true to the original three planes because it is constructed from an angled plane.  I was trying to visualize this scenario when explaining it to my co-workers.  The three point plane method proves it graphically.

Thanks again,
dtctx

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