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Post #4 made 14 years ago
by stux
Those calculators are including a lot of extra length to get out and down the outside of the pot.

The bag needs to basically be slightly higher than your pot side height so you can tie/fasten it around the rim. It also needs to be large enough so that you can put your pot INSIDE the bag, but not necessarily do it up.

My second generation (after modifying the first gen bag) has a base circle the same diameter as my pot, and is sized that so if I put the pot into the bag and do up the draw string it forms a tight cylinder that encloses the pot.

This means, if you're going for a can o beans style bag you need a circle with diameter slightly larger than your pot and a rectangle which is equal in length to the circumference of your pot (plus a bit) (ie π * Diameter), and a width f your pot height + diameter/2 for the top, plus a bit on all sides for seam allowance

But SWMBO really knows, she's the seamstress :)
Fermenting: -
Cubed: -
Stirplate: -
On Tap: NS Summer Ale III (WY1272), Landlord III (WY1469), Fighter's 70/- II (WY1272), Roast Porter (WY1028), Cider, Soda
Next: Munich Helles III

5/7/12

Post #5 made 14 years ago
by stux
I just whipped up a simple spreadsheet.

Haven't put much thought into it, but basically enter your pot width and height, it'll spit out the measurements for a base circle and cylinder body to make a can o beans style bag.

Everything will be in the same units, so if you use mm, cm or inches, it won't make a difference

I've add a couple of multiples of seam allowance to most dimensions... not sure if that's enough, people who know more about sewing than me might want to check it ;)

Will even tell you how much fabric to get ;) (worst case)
BIAB Bag Measurements - Cylinder Aug04.xls
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Last edited by stux on 04 Aug 2011, 10:53, edited 5 times in total.
Fermenting: -
Cubed: -
Stirplate: -
On Tap: NS Summer Ale III (WY1272), Landlord III (WY1469), Fighter's 70/- II (WY1272), Roast Porter (WY1028), Cider, Soda
Next: Munich Helles III

5/7/12
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