Heatshrink sizing [SRO]

glyphiks · July 21, 2020, 8:41am

Height + width + wiggle room = desired flat width of shrink

bollen · July 21, 2020, 9:21am

You can use the following to get the height of staggered packs

glyphiks · July 21, 2020, 10:02am

Lol, I just draw them and measure the drawing

#fuckmaths

bollen · July 21, 2020, 10:20am

Close enough for government work

malJohann · July 21, 2020, 10:44am

Pretty much this is what I do. Flat diameter is what you’re after.

Fosterqc · October 1, 2020, 10:04pm

SOOO MANY SIZES

Fosterqc · November 25, 2020, 11:41am

SOOOOOO DISAPPOINTED IN THIS THREAD

At least I want to get a confirmation on the size needed for the 12S4P PCB kits from @DRI

12S8P 18650 I got 230mm following the steps above.

Fosterqc · December 12, 2020, 11:11pm

I think the 1.2 multiplication factor could be a bit less.

I measured the extra material and there is about 30mm max so I think I could take about 20mm less.

So next time I will probably order 210mm

b264 · December 13, 2020, 12:52am

That’s going to be very difficult to shrink without getting creases.

Fosterqc · December 13, 2020, 1:04am

Good thing I’ll be selling it then

Jk but it isn’t a paid job it’s for a friend. So he can come over and fuck it up himself.

b264 · December 13, 2020, 1:05am

If you have extra heatshrink, just do it once, get all the creases and stuff in it, learn how to avoid it, then cut it off and put another piece on

Don’t short out the cells with your scissors either.

longhairedboy · December 13, 2020, 1:07am

here’s how i do it.

measure the width
measure the height
add the width and height together to get a no margin flat width
add 20mm to get a margin
buy whatever you can find that is closest to that flat width that won’t take 6 weeks to get here

b264 · December 13, 2020, 1:23am

This is the part I struggle with. Mine are always found on AliExpress

b264 · January 30, 2021, 9:51pm

frame · January 30, 2021, 10:01pm

each order is 1M? either they didn’t put the length in, or im blind

b264 · January 30, 2021, 10:02pm

Yes exactly; quantity is number of meters. All in one roll, one piece.

And if you’re in the USA, it takes SO LONG to arrive

Watch the shipping prices as you increase roll size though, there’s often a “cliff” after you pass a certain amount where shipping costs skyrocket. Sometimes better to put in two smaller orders.

For me, from meter 5 to meter 6 shipping skyrockets from $18.47 to $42.84 so I’d order in max 5 meter packages.

frame · January 30, 2021, 10:05pm

meh, i can’t even order more than 5 anyway lol

Fosterqc · January 30, 2021, 10:06pm

jokes on you it came out fucking perfect

DS 12S8P DRI kit 230mm is perf

@DRI @DerelictRobot would you stock that size of the quality stuff??

I can’t even find it actually.

DerelictRobot · January 31, 2021, 1:10am

You’ll want to ask @BenjaminF as he has taken over the Battery Builder Kits & DIY Supply mantle.

Fosterqc · January 31, 2021, 1:11am

ah duck I’ll have to get used to that.