radii ???????

[Andre]

Im doing my assesment for 2d cad, the 3rd task asks me to state the radii donated by R1 R2 R3 AND R4.

 

The task was to draw a propellor then scale it and array it to show a propellor with 2 3 4 and 5 legs.

 

just dont understand the "radii donated" bit.

 

please help

[rvpas]

Hi Andre,

Radii is plural of radius

see wiki

http://en.wikipedia.org/wiki/Radius

Bye

Pascal

[Andre]

Hi pascal thanks for that

 

how do i find the radius of something that has been scaled down ?

 

Andy

[rvpas]

Have you got a scale reference on your drawing ?

[Andre]

i just started with a basic 420 297 dwg and then drew 1 leg of a propellor then scaled it 4 times 0.75 0.65 0.55 0.35 and added 1 leg to each respectively 2 3 4 5 arrayed to create the propellor effect. then it asked for the "radii donated" which i assume is asking for the radius of a certain point on the propellor as labelled ?

 

 

i hope i havent over complicated things, im sure it is very simple to you if u could see it

[rvpas]

A drawing is worth that an one talk, I'm not sure to get it !

could you post a part of your drawing ?

[Andre]

i just tried jpgout and to upload an image but it wouldnt upload for some reason and i cant see how to upload the actual autocad file ??

 

 

ps i really appreciate your help with this

[rvpas]

Which size has your dwg or jpg ? Do you tried Go advanced ?

see tutorial

http://www.cadtutor.net/forum/showthread.php?8863-How-to-add-images-to-your-posts

[Andre]

 

hallelujah i did it!!

 

notice the ri r2 r3 r4 leaders attached to the scaled and arrayed propellors i think it wants to know what the new radii of the scaled down propellors

[rvpas]

I agree with you, it's radius of each propellors.

I think You have to draw a tangent circle with the edges of blades.

see my example

sorry I got only french version

good luck

Pascal

[Andre]

Ok pascal i got values for r1 r2 r3 r4 i will double check with my tutor that im on the right track, thanks very much for all your help,

 

merci beaucoup,

 

abientot (probably

[rvpas]

Good luck for you assement

Bon courage

Salut

Pascal