So much for my math ...
07-11-2011, 11:55 AM
#21
Super Member
Join Date: Feb 2010
Location: Tucker, GA
Posts: 2,042
The formula for each piece is this: Subtract 1/2" from each dimension. Divide each dimension by 2. Add 1/2" to each dimension.
Example: 8 1/2" x 4 1/2" rectangle to be made half size.
8 1/2" - 1/2" = 8. Divide by 2 = 4. Add the 1/2" back = 4 1/2"
4 1/2" - 1/2" = 4. Divide by 2 = 2. Add the 1/2" back = 2 1/2".
Example: 8 1/2" x 4 1/2" rectangle to be made half size.
8 1/2" - 1/2" = 8. Divide by 2 = 4. Add the 1/2" back = 4 1/2"
4 1/2" - 1/2" = 4. Divide by 2 = 2. Add the 1/2" back = 2 1/2".
07-11-2011, 01:02 PM
#23
Senior Member
Join Date: Jun 2011
Location: Lehigh Valley, PA
Posts: 677
Oh I totally agree! me and algebra got along great most days, but basic math, not so much! I wanted to make a miller's crossing quilt, but I wanted 12 inch blocks, not 6 inch blocks, so instead of googling it to find the correct measurements, I just double everything. NOPE!! All my 9P on point pieces don't have points, and my pinwheel blocks have little borders on them. Good luck though, you may get it!
here's half of it!
[ATTACH=CONFIG]225020[/ATTACH]
07-11-2011, 05:38 PM
#24
Super Member
Join Date: Mar 2011
Location: Pratt Kansas
Posts: 1,222
the 1/4" seam allowance also applies to each unit within the block.
A finished 12" block which is not joined to other blocks is 12 1/2".
Reduce finished 12" (not 12 1/2) to 6". But you have to add 1/4" to each component of the block and the outside seams.
A triangle in a sqare would be plus 1/2" for the outside seams, no extra width-wise, but plus 3/8" plus 3/8" for both sides of the triangle height-wise. (triangle is pointing up or down)
A pinwheel would be plus 1/2" outer SA plus 1/2" inner SA both directions, ditto a sq in a sq.
A finished 12" block which is not joined to other blocks is 12 1/2".
Reduce finished 12" (not 12 1/2) to 6". But you have to add 1/4" to each component of the block and the outside seams.
A triangle in a sqare would be plus 1/2" for the outside seams, no extra width-wise, but plus 3/8" plus 3/8" for both sides of the triangle height-wise. (triangle is pointing up or down)
A pinwheel would be plus 1/2" outer SA plus 1/2" inner SA both directions, ditto a sq in a sq.
07-11-2011, 08:23 PM
#26
Banned
Join Date: Dec 2009
Location: Enid, OK
Posts: 8,273
Originally Posted by CompulsiveQuilter
Converting a 12" block to a 6" ... divide in half and add 1/2", right. Easy peasy. WRONG. I still don't know what happened; too mad to mess with it right now.
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