|
View previous topic :: View next topic
|
| Author |
Message |
jsevinsk
Joined: 30 Aug 2005
Posts: 2
Location: Shrewsbury, MA
|
 Posted: Tue Aug 30, 2005 6:35 am Post subject: Need help drawing rafters for hip roof |
    |
|
I would like some tips for drawing the rafters for a hip roof. I can draw the normal rafters and hip rafters OK, but I'm having trouble getting the jack rafters to meet nicely with the hip rafters. Any advice?
Thanks,
John |
|
| Back to top |
|
 |
Steel Shade
Joined: 29 Jul 2005
Posts: 45
Location: Diamond Bar, CA
|
| Posted: Tue Aug 30, 2005 5:50 pm Post subject: |
|
|
I believe I have a solution for you. I struggled with the problem for some time before discovering what works and what doesn't.
Step 1: Do the math. You will need to sit down with pencil, paper, and calculator first to figure out the altitude angles of both your hip rafters and jack rafters relative to the ground. You will use these angles to rotate your rafters into place. If you don't need something so precise you could just eyeball it.
HIP RAFTER:
Step 2: Draw your hip rafter as if it where lying lengthwise on the ground, narrow side down. Make it much longer than you really need, you will trim it back later.
Step 3: Go to an elevation view to see your hip rafter lengthwise. Enter the angle you calculated in step 1 in the Object Info window. If it rotates the the wrong way, undo, and try again with a - sign in front of it. Also drag it up to the appropriate position above your floor.
Step 4: Now go to plan view and rotate it 45 degrees (assuming your walls meet at 90 degrees). Using the Shift button makes this easier. You should now have your hip rafter in place at the proper angles. (you will duplicate circular a copy of it later for the other side of the hip.)
JACK RAFTERS:
Step 5: Draw one jack rafter so that the ALT key controls the long length of the board, NOT the height or depth. In my experiments I discovered that box shapes Fit most reliably along their Alt keyed axis. I have no idea why.
Step 6: Go to plan view and place your jack rafter as if it were lengthwise on the ground perpendicular to the outside wall. The reason is because you will later use the Fit command to make all the jack rafters fit perfectly up against the Hip rafters. You don't want any Jack rafters "poking" thru your hip rafter before you Fit them.
Step 7: Go to elevation view again and either use the angle you calculated in step one for your jack rafter, or rotate by eye balling it. Then line up the angled jack rafter with the hip rafter, but not so that it will "poke thru" the hip rafter after you duplicate it. Go to an axon view and test Fit command to make sure it works right before duplicating it. Undo the Fit command.
Step 8: Duplicate Linear your Jack rafter at 16" or 24" on center.
Step 9: Make sure none of your jack rafters is touching the Hip rafter and then select all the jack rafters and use the Fit command in the appropriate direction. They should elongate and fit perfectly up against your hip rafter if all the pieces are lined up well.
Step 10: You should now have one Hip rafter and all the jack rafters abutting it nicely on one side. Now Group your jack rafters, trim off the extra length you don't need and delete it, copy and paste them in again, and Flip them in the appropriate direction. Use plan view to drag them into place. Now you have jack rafters on both sides of your hip rafter.
Step 11: Go to plan view. Group all rafters together, hip and jacks. Duplicate Circular with 2 copies at (+ or -) 90 degrees, clicking at the top of your hip rafter to define the rotation point after clicking "OK". Now you have 2 hip rafters with their jack rafters.
You're done! I know it looks complicated, but once you've done it you won't need these directions ever again.
Post another message if you have any problems. |
|
| Back to top |
|
|
|
blogger
del.icio.us
digg
slashdot
