I have a sheet metal pattern that is a cylinder with the top cut at an angle. I am unsure how to dimension the top of the flat pattern so that this could be cut out of sheet metal.
It may not be easy to provide the dimensions in flat pattern vie, so give dimensions for the folded part plus 1:1 flat pattern view for reference.
You could create a grid upon a the flat pattern and give the dimension in every 1 cm on the top edge.
It's not going to be .001 accurate but i have done this multiple times and and a good iron-worker is going to
cut this with ease.
The only dimensions that you need for the flat are the over all height and width of the part.
I'm on SW2015, so forgive me if I've gone off track here.
Since the cylinder is cut on a slant, the resultant flat profile is sinusoidal.
As mentioned in previous posts, you can provide reference dimensions along this profile to aid in fabrication, but you need to modify the flat pattern view first:
1) On the flat pattern drawing view, offset the sine profile (it's 3 splines) with a zero offset. Right-click and hide the offset dimension.
2) This gives you the splines' endpoints to dimension to. Add these to your ordinate dims
3) To dimension to the bottom of the middle spline, add a point first and dim to it.
4) If you want/need more references, especially ones that are at even increments, offset the left (or right) end of the flat pattern by the desired amount. Hide the offset dim.
5) Trim the offset line to its spline and change the trimmed line to construction. Add its endpoints to your ordinate dims. (The line at X=2.00 was created this way.)
6) Repeat #4 & #5 for however many reference points you'll need.
See the attached.
I hope this helps.
It looks as though Kevin is thinking along the same line as me. I'm guessing you might be scribing this out on a piece of metal and would like to know where the points should be placed then using a Beverly shear or tin snips to cut this out. I placed a sketch line on the left edge then patterned it to the right go get 6 equal spaces then placed points at their intersection with the drawing curved edge.
I've done this a few times by saving the flat pattern view to dxf at 1:1 scale. Many metal suppliers have laser, plasma, or water jet cutters that read the dxf file and cut it out.
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