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  #1  
Old 06-04-2005, 11:37 AM
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Default How Many Degrees of Bend For this Pattern?

I have attached a drawing of a pattern for a lantern top I want to build. With some test pieces of this pattern, I have tryed to form the part and I have gotten really close to being right with the bends. I can not seem to remember how to figure out how to calculate to bends.

Any help would be good.
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File Type: dxf lamp_top_34.dxf (12.5 KB, 160 views)
File Type: dxf topper_34.dxf (18.7 KB, 120 views)
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Old 06-04-2005, 02:46 PM
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You can measure this bend angle exactly if you create an aux.end view. Here is why you may want to understand "Discriptive Geometry" it helps you understand the stuff you can't easily see. Work on revolution skills, is this something we should go over, or do you understand what i'm refering to?
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Old 06-04-2005, 06:00 PM
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Bud, If its not to much trouble , I could use a refresher, too much duct factory for me lately.
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Old 06-04-2005, 06:06 PM
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Price..check back in the morning I have your plans adjucted to show the true angle (almost done, but the wife is calling) If you wish to work on the drawing what you want to do is is spin the drawing so that the seem is not in the hortizontal position in the top view, instead place the intersection of the two planes in that position, project down to get the true length of the intersection of both planes and then you can create the aux view of the end in the lower drawing...this will allow you to measure the exact angle? Sounds like a lot of work, but it relly isnt once you get more practice on projections...

I'll get a better view up tomorrow...
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Old 06-04-2005, 06:11 PM
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Thanks, I will take a trip through the library to see if anything comes to me.
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Old 06-05-2005, 09:45 AM
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Here is an attachment and the text will be shortly, but you may get the idea?
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projectionlocateangle.jpg  
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Old 06-05-2005, 09:53 AM
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How was B1 established?
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Old 06-05-2005, 10:57 AM
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Check this to see if I am on the right track, not 100% about it.
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File Type: dxf topper_34_2.dxf (23.1 KB, 79 views)
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Old 06-05-2005, 03:19 PM
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I'll post the instructions and how i got there after dinner sometime...you can't project the way you did, hang tight and check back..around 7 or so
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Old 06-06-2005, 05:25 AM
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When looking for the true angle in the end view, I'm focusing on A1 to A2, I'm looking for the true length of this plane ( not that that will help me with the angle (the angle wont change because of the length) But it will give me a true shape of the end view...to get the true length of this plane I projected a line to B1 and A2 is projected to B2. In creating a true length triangle A1 to A2 is the height and B1 to B2 is the base, then the true length is determined? Now in your side view these lines are projected from the front A1 and A2, from your side view and where the two planes meet (there is a slight X) strike an arc at a distance of the true length you've just established to intersect the line drawn from A2....more later, if you have any questions please ask and notice that 1 to B3 in the top view is parallel to the hoizontal plane..you need this because in order to see the true length in the front view it must be projected (perpendicular from the top view) your one drawing didn't show this and this is why I revolved to plane to be parallel with the horizontal line

Take care my friend
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