To all you sewing lot...

diameter 29” yes.

The circumference of the bottom disc also has to be 28"
Once you have set the size of the tube it can't grow.
If you make the disc bigger you will just end up with excess fabric around the edge when you sew to the quarters.
Ideally you need to set the size of the disc as you want it to end up after completion. Then add your seam allowance to the outside of it, then measure the circumference. The tube is then that size, plus whatever seam allowance you want to close the tube on each end. Because you have a closed tube already, the disc can't have a bigger circumference than the tube.

That would give a 91" circumference. :)

Fuck me, I’ve struggled with this for ages and just kept messing up. This makes so much sense, thanks. Hopefully my next attempt at a round bag will finally be round.

I found an online converter that gives me a diameter of 9.2" including seam. Will see how that goes tomorrow. Starting from the base makes more sense, I'll try that next time.

But you've already closed the seam on the tube no? If so, you just need the finished circumference of the tube. If that is 28" it should give a disc diameter of 8.91". If you then sew a half inch seam all the way around, the finished disc when you turn it right way around should be pretty much an inch less than that in diameter.

If my base and my tube both have identical circumferences then how do I attach one to the other?

Ok, think of it this way...
If your circle measures 29" all the way around its edge...
and your tube measures 28" all the way around its edge...
And you want to sew the two pieces of fabric together...with their edges meeting all the way around. You would effectively be having to stretch the tube fabric all the way around (or cut notches) to make up for the missing inch in length.

With them both being the same size, it means your outer edges match, and effectively the inner line of the seam is bunching up slightly.

You need to half and quarter the tube, and the disc, and then as you sew edge to edge, keep tracing to make sure your marks are meeting.
I also have my 'shape', in this case a circle on the bottom, and sew my boxing in (tube) on top.

You will basically end up with a kind of 'rounded', soft bottom edge, and the circumference around the finished, exposed disc will be less then 28" because of the seam.
If you want the finished disc to still have a circumference of 28", you would actually have to start with an extra inch of diameter , so 9.91", and be easing the outer edge of the disc in so it puckers as you sew. (or cut notches in the edge and allow them to slightly overlap each other)
It's hard to explain, but this would make the finished disc resemble a 'lid'...with a half inch side all the way around (which would be hidden inside the tube).

If you want the finished disc to still have a circumference of 28", you would actually have to start with an extra inch of diameter , so 9.91", and be easing the outer edge of the disc in so it puckers as you sew. (or cut notches in the edge and allow them to slightly overlap each other)
It's hard to explain, but this would make the finished disc resemble a 'lid'...with a half inch side all the way around (which would be hidden inside the tube).

Yes, this was what I wanting to do, and failing to explain! Came out ok in the end. By my standards.

Drawstrings next- any tips?

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Ah yeah. didn’t read the bit about it being laid flat 🤣

@moocher glad you got it sorted. You can make your life 100 times easier ignoring the seam allowance from all your calculations. draw/measure/calculate all the pattern pieces at their ‘finished’ size. then add your seam allowances afterwards.

another question:

if i'm joining two pieces with a basic (running?) stitch, is there a neater way to stop it unravelling than just doing a couple of short forward/reverse passes at either end? That's fine if it is going to be hidden, but where it will be visible it looks a bit messy.

You can make a knot with the threads.

Makes sure to have plenty of thread coming out of the machine before starting, and pull a good amount at the end before cutting them. At each end there will be one thread on the outside and one on the inside. Use a needle to take the outside one inside. Make a knot with the thread inside.

Personally I don't bother and just try to be careful when doing the reverse stitch bit at the start and end. Having a thread matching the fabric colour also helps :-)

You can do the forward/backward stitches using your hand on the ‘wheel’ rather than using the pedal. Not sure which machine you’re using but on mine if you put a tiny bit of pressure on the pedal it releases then tension on the wheel.

Practice with the pedal though for anywhere it won’t be seen - you’ll get the control needed eventually.

Is anyone on here doing Scrub Hub?

Been sewing again tonight.. made this frame bag to fit my bike.. beenbusing up the 1m of fabric I bought to start with. Also did a feed bag and top tube bag a few days ago..

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That looks really good. Tidy stitching.

Yeah that’s hella pro. Nice work

That turned out really well!
I like the look of that zipper garage.

Very tidy, work especially on the zip. Looking back, by comparison, some of my early works were an absolute travesty when it came to the zips. Also nice bike! is it a re-painted genesis? what RAL code is it?

Yes, Croix de Fer just painted on Monday. RAL 7004.. I have a project thread on the bike too. my sewing isn't great but I quite like the thought process of putting it all together.. I literally bought 1m of fabric and a few bits and bobs and started sewing.. I have to get my wife to put thread onto the bobbin (the wee one under the needle).. this is what I've made in lockdown.. all set and nowhere to go..

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Super impressive

^^ those bags are ace.

Much rougher stitching, my old hi-viz musette style bag was getting holes in it so I replaced it.

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Got back into the game with a little frame bag to carry tools, compatible with both of my bikes:

And I did a camera strap à la Outer Shell Adventure for a friend. Got the camera attaching hardware from AliExpress as I couldn't find a supplier in the EU and the buckles (including a magnetic one) from https://www.adventurexpert.com/ :

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Bag looks great, where did you get the rubber straps?? Camera strap also great.. any pics of it in and a camera on it?