# Thread: DIY Differential Cut UQ Calculator

1. Vote for sticky, this spreadsheet is a real time saver when your planning your DIY UQ project.

2. Thank you for this calculator , it just cleared up a lot of questions i was about to ask

3. Thanks for this calculator, CatSplat --

Just bought a new (to me) sewing machine and looking at several projects -- this is such a help!

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4. ## Thank you

I am just starting my DIY addiction. Thanks for the spreadsheet I vote for sticky also. Man you did a great job on this

5. Amazing. Thanks so much for putting this together.

The last hurdle of procrastination for starting my underquilt (doing the math to figure this out myself), is no longer an excuse. I'll be ordering my supplies next week.

6. I'm mainly asking this for accuracy in temp ratings. How is the Hc Maximum Chamber Height calculated? I am using 2.5" baffle material, and it will be differential cut using approximately the suggested baffle widths.

7. Originally Posted by Junebugdawn
I'm mainly asking this for accuracy in temp ratings. How is the Hc Maximum Chamber Height calculated? I am using 2.5" baffle material, and it will be differential cut using approximately the suggested baffle widths.
Junebugdawn, maybe I can help a tiny bit, as I just used the calculator to make a couple UQ's. The Hc (max chamber height) is an input, not an output. It basically determines (to some degree) how much difference there is (in size) between your inner shell layer and outer shell layer, thus determining how "tall" your baffle is; not at the sides where the mesh/netting is sewn to the outer shell, but the apex of the semi-circular chamber (or max loft).

I'd like to give a HUGE thank you to CatSplat for making this underquilt calculator. It helped immensely with my projects!

I know the calculation for approx. weight of the quilt is experimental, but if you'd like to include one more thing, maybe you could add input fields for side seam allowance and top/bottom seam allowance, then multiply by 2, and then have them add in the calculation for approx weight of quilt (through alternate inner shell & outer shell dimension fields, which would not be used to calculate anything else but approx weight). I kept trying to change the input dimensions to include seam allowance to get a guesstimate of overall quilt weight, but it always make the volume of quilt and down fill results too high - I did get around it by adding in a negative down over-stuff amount, though.

Keep up the good work! It's fantastic!

8. The spreadsheet is great. Ive been planning out my quilt but ran into a question. In the same way that 2x the loft was added to the width shouldn't you also add 2x the loft to the length? it seem necessary so as not to compress the ends.

9. Yes, thats a dual differential. Not required but does help some. If you search around you'll find a modification of this sheet that I made that shows that, plus allows for seam allowance.

10. great work

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