Calculating Rows and Columns
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[ Kibitzer ]

Joined: September 11, 2011
Posts: 26
Submissions: 2
Location: Lexington, Kentucky

 Calculating Rows and Columns Posted on Sat May 12, 2012 12:03 am Link to Post: Not real sure how to word this, but here goes. If I'm making a 1 square foot section of mail from 18g 3/16 (or any type), how do you figure out how many rows and columns of rings that you'll need? I know that TRL has ring counts per square foot, but I know from experience that if I do a 15x15 ring section, it isn't square. How do I figure out that ratio? Thanks
Konstantin the Red

[ Uber Mouth ]

Joined: March 27, 2002
Posts: 3493
Submissions: 1

 Posted on Sat May 12, 2012 12:33 am Link to Post: Hmm. Stretch it out side to side -- row wise -- and it gets squarer. I never bother with figuring; I just go empirical. Need some more? -- add some more, and done. This is knitting, near enough -- there's such a thing as sweating it too much. Oh, first post? Welcome and well come!'The Minstrel Boy to the War is gone...'

Joined: March 3, 2002
Posts: 4378
Submissions: 79
Location: tres piedras, new mexico

Re: Calculating Rows and Columns
Posted on Sat May 12, 2012 1:54 am

 Shadowfire19 wrote: Not real sure how to word this, but here goes. If I'm making a 1 square foot section of mail from 18g 3/16 (or any type), how do you figure out how many rows and columns of rings that you'll need? I know that TRL has ring counts per square foot, but I know from experience that if I do a 15x15 ring section, it isn't square. How do I figure out that ratio?

no quantity of rings is ever enough.

you'll start thinking, "i'll just make this little patch."
two years from now you'll be giving up one of the rooms in your house to the craft.
ten years from now you'll be hopelessly hooked, wondering what you're going to do with all the things you've made. that are covering every square inch of shelving.

or else.

PSA: remember to stretch.
3.o is fixing everything.
djgm

[ Ancient Forge ]

Joined: November 25, 2010
Posts: 1726
Submissions: 100
Location: Es-whoy-malth B.C.

 Posted on Sat May 12, 2012 2:23 am Link to Post: if you made a diamond with the 225 links (or however many you would need) it would be the same on all four sides.
Rognvald

[ Big Voice ]

Joined: January 29, 2011
Posts: 240
Submissions: 0

 Posted on Sat May 12, 2012 3:57 am Link to Post: How about making a 1" or larger patch, and estimating from that sample?
Zlosk

[ Major Voice ]

Joined: February 15, 2002
Posts: 385
Submissions: 10

 Posted on Mon May 14, 2012 5:40 pm Link to Post: If you're comfortable with math, here's how I figure out rings per square foot on the page http://www.zlosk.com/maille/euro4-1.html. You can also see these equations if you look at the source code. AR = Aspect ratio WD = Wire diameter ID = Ring ID iph = inches per horizontal ring ipv = inches per vertical ring AR = ID/WD iph = WD * (0.9215*AR - 0.1566) ipv = WD * (-0.0582*AR^3 + 0.8677*AR^2 - 3.2996*AR + 6.2401) NumberOfRings = 144/(iph*ipv) This deals with the weave hanging the "right" way (as in how most armor is made) at half stretch. The equations are based on empirical measurements of several patches of Euro 4-1 at different aspect ratios (range of around 3.1 to 6). iph & ipv are what you need to figure out your rows and columns. IGP (Irregular Grid Painter) Links: Home | FAQ | Downloads

[ Kibitzer ]

Joined: September 11, 2011
Posts: 26
Submissions: 2
Location: Lexington, Kentucky

 Posted on Mon May 14, 2012 10:41 pm Link to Post: Easy enough. I did the calculation for 16g 1/4" rings by hand and came up with the same answer as your calculator does, so this works for me. Just curious, but why is there a difference between your formula's count and TRL's count (Granted, it isn't that much)? Is it a rounding difference, a # of decimals difference, or inches vs. millimeters? So, in looking at your formula, you can figure out how many rows and how many in a row by taking 12/IPV and 12/IPH respectively, right? Thanks Zlosk and everyone for taking the time to answer.
Zlosk

[ Major Voice ]

Joined: February 15, 2002
Posts: 385
Submissions: 10

 Posted on Mon May 14, 2012 10:50 pm Link to Post: I imagine the difference lies in our different methodologies, sample sets, and how we defined half-stretch. IGP (Irregular Grid Painter) Links: Home | FAQ | Downloads