« previous next »
Pages: 1 2 [All] |   Go Down

Author Topic: Inside/Outside radius  (Read 7502 times)

0 Members and 1 Guest are viewing this topic.

John Hancock

  • Guest
Inside/Outside radius
« on: May 24, 2006, 03:09:45 PM »
At one time I had a formula that would give me the inside radius of a pipe drawn in 2D if I entered the outside radius.  In other words, the inside radius looked as good as the outside radius. I use R2000 but this computation was from a board draftsman. 
Logged

cad-waulader

  • Guest
Re: Inside/Outside radius
« Reply #1 on: May 25, 2006, 06:26:21 PM »
Not clear what you're trying to do.
Logged

Bob Wahr

  • Guest
Re: Inside/Outside radius
« Reply #2 on: May 25, 2006, 07:16:11 PM »
What kind of pipe?
Logged

drizzt

  • Guest
Re: Inside/Outside radius
« Reply #3 on: May 26, 2006, 09:46:21 AM »
You would have to enter wall thickness somehow right?
Logged

Bob Wahr

  • Guest
Re: Inside/Outside radius
« Reply #4 on: May 26, 2006, 11:27:05 AM »
I'm guessing that what the formula does is approximates a wall thickness based on O.D.
Logged

Swift

  • Swamp Rat
  • Posts: 596
Re: Inside/Outside radius
« Reply #5 on: May 26, 2006, 12:28:15 PM »
Where I come from we would approximate the OD from the ID.

Just remember though, if the inner diameter is larger than the outer diameter, the hole will be on the outside.
Logged

Maverick®

  • Seagull
  • Posts: 14778
Re: Inside/Outside radius
« Reply #6 on: May 26, 2006, 02:20:09 PM »
Good one.  :-D

Logged

Greg B

  • Seagull
  • Posts: 12417
  • Tell me a Joke!
Re: Inside/Outside radius
« Reply #7 on: May 26, 2006, 02:29:54 PM »
Heh...


I must be missing something.  Whether you know the I.D. or the O.D. it doesn't matter cause what you really need to know is the thickness of the wall of the pipe.

Say you have a pipe that is 2" in diameter.  The thickness of the wall is 1/8".  That would make the interior diameter 1 3/4".


Too simple, so I must be missing some key information.

Maybe you're looking for some code that figures this out.
Logged

John Hancock

  • Guest
Re: Inside/Outside radius
« Reply #8 on: May 30, 2006, 11:14:15 AM »
It really doesn't matter what the wall thickness is.  This is simply making the inside radius look as good as the outside radius when drawn as a 2D drawing. It doesn't have to be a pipe it could be two parallel lines filleted at the corner.
John
Logged

Maverick®

  • Seagull
  • Posts: 14778
Re: Inside/Outside radius
« Reply #9 on: May 30, 2006, 12:33:15 PM »
  You just add/subtract the distance between the parallel lines to/from the radius you have.

  If you have 2 lines joined with a radius of 36" and you have 2 lines parallel to those 24" away your radius would be 60" or 12" depending on which way you are going.

  Clear as mud? 
Logged

M-dub

  • Guest
Re: Inside/Outside radius
« Reply #10 on: May 30, 2006, 12:46:34 PM »
Quote from: Maverick® on May 30, 2006, 12:33:15 PM
Clear as mud? 

Yep :-D

Now, I'm no piper, so there's a very good chance that I'm way off in left field with this one, but are we talking about the difference between copying one radius versus offsetting it?
 :?
Logged

Maverick®

  • Seagull
  • Posts: 14778
Re: Inside/Outside radius
« Reply #11 on: May 30, 2006, 12:53:05 PM »
  Clearer Mud.  Yup, that's what he's thinking of M-Dub.  I think so anyway.  BTW I'm not a programmer so if you are looking for a routine to do this for you ...... you'll have to ask someone smarter than I.   :-D
Logged

John Hancock

  • Guest
Re: Inside/Outside radius
« Reply #12 on: May 30, 2006, 01:27:26 PM »
Maverick,
I think you hit the nail on the head.
John
Logged

Bob Wahr

  • Guest
Re: Inside/Outside radius
« Reply #13 on: May 30, 2006, 02:06:52 PM »
So you want a program that emulates the OFFSET command exactly?  The formula for calculating the inside radius would be
R2=R1-D Where R1 is the outside radius, R2 is the inside radius and D is the diameter of the pipe.
Logged

John Hancock

  • Guest
Re: Inside/Outside radius
« Reply #14 on: May 30, 2006, 02:27:50 PM »
I wasn't looking for a program for the inside/outside fillets (radius) but if one is available...
Logged

Maverick®

  • Seagull
  • Posts: 14778
Re: Inside/Outside radius
« Reply #15 on: May 30, 2006, 02:37:50 PM »
  K,  I don't use Acad.  But can't you just offset?  Are you just drawing a line (2d obviously) for one side of the pipe and offsetting whatever the diameter is?  Couldn't you just offset the radius too?  Or am I missing something? 

  In the example I drew a line, and then one perpendicular to it, used curved fillet (again not Acad command but I'm pretty sure you have something similar) and then offset each one.

  I must be confused............ Again.  :-D
Logged

M-dub

  • Guest
Re: Inside/Outside radius
« Reply #16 on: May 30, 2006, 02:42:04 PM »
Quote from: Maverick® on May 30, 2006, 02:37:50 PM
I must be confused............ Again.  :-D
Right here with me...
At least your seat didn't get cold when you left.  ;)
Logged

Maverick®

  • Seagull
  • Posts: 14778
Re: Inside/Outside radius
« Reply #17 on: May 30, 2006, 02:49:18 PM »
  yeah well the A/C works here.  :-P
Logged

John Hancock

  • Guest
Re: Inside/Outside radius
« Reply #18 on: May 30, 2006, 02:58:14 PM »
It appears to me I have opened a can of worms.  I just wanted to the inside radi to looked balanced with the outside. 
Logged

M-dub

  • Guest
Re: Inside/Outside radius
« Reply #19 on: May 30, 2006, 03:01:57 PM »
I think the Offset command is your best friend, then John.
Logged

Maverick®

  • Seagull
  • Posts: 14778
Re: Inside/Outside radius
« Reply #20 on: May 30, 2006, 03:06:23 PM »
  No can of worms John.  I was just wondering.  No biggie.   :kewl:
Logged
Pages: 1 2 [All] |   Go Up
« previous next »