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Author Topic: adding seam allowance.  (Read 2261 times)
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tommymcmillan
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« on: June 24, 2009, 04:11 PM »

when adding seam allowance do you add it to both of the seams that are being joined or to one side?
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indigo_wolf
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« Reply #1 on: June 24, 2009, 04:59 PM »

when adding seam allowance do you add it to both of the seams that are being joined or to one side?


http://www.geocities.com/gengvall/sew/sew.html

Search for "Seams:" to scroll to the parts of interest.

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mikenchico
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« Reply #2 on: June 25, 2009, 12:42 AM »

Depends on the type of seam and your design. If using a broadseaming technique add 3/16" to both sides, that gives you a 3/8" overlap for your tape or glue and keeps your design line in the middle of the seam.

If your going with a fell seam (double fold) things get more complicated. Especially if you want the seam centered on your design line, then you have add 1/8" or 1/2" depending on which way your rolling the seam, one side (preferably the downwind) gets the short allowance the other gets the long then your first sewing line is 1/8" inside your design line on the panel with the 1/8" allowance and 1/8" outside your design line on the side with the 1/2" + allowance. When rolled and your second stich line done that will give you a 1/4" wide seam centered on your design line.

I've probably got all that wrong since I blow it even after spending an hour folding paper to prototype it  Shocked

I like broadseaming, it's way easier and you can do curves. But I sure appreciate a well built kite using fell seams, like the Delta Drive with it's complex 1/8" fell seams, a work of art IMO.



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CTaylor
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« Reply #3 on: June 25, 2009, 05:24 AM »

I typically add half the seam allowance to each of the panels.  Also remember to overlap darker colors on top on the front of the kite.
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tommymcmillan
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« Reply #4 on: June 25, 2009, 12:12 PM »

Why do you overlap darker colors on top of lighter colors?  Huh Sorry for the new builder questions. Embarrassed
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CTaylor
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« Reply #5 on: June 25, 2009, 12:49 PM »

Why do you overlap darker colors on top of lighter colors?  Huh Sorry for the new builder questions. Embarrassed
Dark colors show through the light color fabric even when they aren't backlit.  It looks better to have a dark color on the top.
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Jest_of_Eve
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« Reply #6 on: June 25, 2009, 01:13 PM »

Absolutely.

Darker over lighter on the kite-front is the basic rule, it just looks better.
Colour schemes that use high contrasting colours also work better and look sharper for this very reason.

RE seams. If you go for a simple overlap like mine or Benson, I certainly use approximately 8mm in total and that means 4mm allowance for each overlapping panel. Hidden edge areas require nothing.

I don't know about other panel stitching methods, but would probably use the same system if say, I used flat-felled seams. That way everything is equal.

Mark
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chilese
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« Reply #7 on: June 25, 2009, 01:57 PM »

If you look at the FULL SIZE version of this picture hyperlinked below, you will see how the blue panel shows up behind the white panel. Surprising to me on a Jeff Howard kite.

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EBGB
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« Reply #8 on: June 25, 2009, 05:30 PM »

Interesting... I've always added the seam allowance to the lighter colored panel, then when you stack dark-to-light, the visual edge ends up where the design edge is.

Rules are made to be broken though.
I suspect that anyone who builds volume is going to develope an assembly order, and they're not going to change every time the colors change.
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mikenchico
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« Reply #9 on: June 26, 2009, 01:29 AM »

Interesting... I've always added the seam allowance to the lighter colored panel, then when you stack dark-to-light, the visual edge ends up where the design edge is.

That actually makes real good sense and I'm sure I'll be considering your point in future builds. Always learning from everybody's input. But it does complicate a complex sail graphic even further doesn't it?

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