Distinguished Contributor
Posts: 417
Registered: ‎10-06-2008
Message 1 of 5 (3,788 Views)

# need help Drawing 2d pipe bends

3788 Views, 4 Replies
08-23-2010 07:14 AM

This something I do quite often yet I always struggle with. The bends always come out looking funny. Does anyone have a tried and true method for doing this? I'm getting sick of trial and error.

Mentor
Posts: 699
Registered: ‎04-21-2006
Message 2 of 5 (3,775 Views)

# Re: need help Drawing 2d pipe bends

08-23-2010 08:55 AM in reply to: Loffmar77

Valued Mentor
Posts: 1,257
Registered: ‎08-17-2007
Message 3 of 5 (3,744 Views)

# Re: need help Drawing 2d pipe bends

08-24-2010 02:58 PM in reply to: Loffmar77

What problem are you having?  A standard elbow is 1.5 times the nominal diameter, so the centerline radius of a 6" pipe is 9", then oftset that centerline by half the actual pipe diameter (6.625 / 2 = 3.3125), connect the ends and that's an elbow.

There are several third party piping products out there, among them are :

http://www.asvic.com.au/category/Mech-Q-Piping-18.html

Valued Contributor
Posts: 59
Registered: ‎12-21-2008
Message 4 of 5 (3,677 Views)

# Re: need help Drawing 2d pipe bends

09-17-2010 12:18 AM in reply to: Loffmar77

Using ACAD 2010 - Here you go! Use this...good luck.

Contributor
Posts: 14
Registered: ‎04-09-2010
Message 5 of 5 (3,395 Views)

# Re: need help Drawing 2d pipe bends

01-18-2011 06:05 AM in reply to: Loffmar77

See if this helps...

Draw two 10' long, 4.5" OD conduits intersecting at 90° at the southwest point (imagine the capital letter "L").

1. Construct the first conduit ("horizontal" rectangle) from #0,0 to @120,4.5
2. Construct the second conduit ("vertical" rectangle) from #0,4.5 to @-4.5,120
3. Create centerlines along the longer axis for each conduit. You will have a horizontal xline through #0,2.25 and a vertical xline through #-2.25,4.5
4. Since pipe bends are calculated from the middle of the pipe, the intersection of those two xlines will be the point to offset. This point should be #-2.25,2.25 (FOR BOTH FILLETS !!)
5. You will need to know the proper bend radius of the conduit, pipe or tube material. In this example, we'll use 4 times the outside diameter or 18 (4×4.5)
6. Create a point from #-2.25,2.25 offset @18,18. This should be at #15.75,20.25
7. Explode the two rectangles (you won't be able to fillet the rectangles correctly if you skip this)
8. Create the inside fillet. Start the FILLET command, specify RADIUS and select the point at #15.75,20.25 then select the point <270° to the horizontal conduit (this should be #15.75,4.5. The radius length will be 15.75). Select the two inner lines to fillet. End the FILLET command.
9. Create the outside fillet. Start the FILLET command, specify RADIUS and select the point at #15.75,20.25 then select the point <270° to the horizontal conduit (this should be #15.75,0. The radius length will be 20.25). Select the two outer lines to fillet.
10. Trim and/or erase any temporary and construction lines.

Once you get the hang of it, you can easily consolidate this process to about 3-4 steps. HTH !

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