The Sewing Place

A Bad case of Triangulitis!!!

Sewot

A Bad case of Triangulitis!!!
« on: November 18, 2020, 01:09:46 AM »
HI all.
I hope this ends up in the " Fun with Fabric " corner as I am deffo having that albeit frustrating.
I am making sails for my Radio Controlled model yachts.
With the larger sails already sewn it is not so noticeable but I am trying to sew a very small Top Sail which is supposed to be Triangular with STRAIGHT sides and the process is giving me grief.
I just cannot, however hard I try, get the sides straight.
I really would appreciate any pointers you may have to offer if you could spare me your time.
The first two attempts in yellow poplin ( 80% synthetic) are really bad.
The third attempt with Egyptian cotton is getting there but still niggling me.
I have tested my machine tensions to exhaustion and as far as I see it, it is perfectly set but I may be missing something vital here?
Less tension??
Has anyone sewn a triangle and experienced this please?
Pete

Renegade Sewist

Re: A Bad case of Triangulitis!!!
« Reply #1 on: November 18, 2020, 05:26:50 AM »
 :laughing: ah, the joy of true bias.

Next attempt, and mind you, just a theory, starch the fabric before cutting. Make sure that one of the sides is on the true straight of grain when you cut it. Also I would cut strips of stabilizer to run underneath it when I sew it. Wash away, tear away or heat away types.

You could also use a tiny width of something like steam a seam when you press up the hems.

snoozi soozi

Re: A Bad case of Triangulitis!!!
« Reply #2 on: November 18, 2020, 07:43:03 AM »
Yeah, cutting on the bias is the prob.
How about cutting a square and folding it to a triangle and stitching up that way?  :thinking:
Let it sew, let it sew, let it sew

Iminei

Re: A Bad case of Triangulitis!!!
« Reply #3 on: November 18, 2020, 08:04:42 AM »
Well if our Notifications thingy worked I would say @BrendaP  !!!

She is the mathematical whizz, a title shared with @Deafoldbat but I suggest you are cutting catawompuss
The Imperfect Perfectionist sews again

Efemera

Re: A Bad case of Triangulitis!!!
« Reply #4 on: November 18, 2020, 08:42:28 AM »
Stay stitch the edges before you turn the hem.

Flobear

Re: A Bad case of Triangulitis!!!
« Reply #5 on: November 18, 2020, 09:12:29 AM »
Two edges will always be on the bias even if one is on the straight grain. I agree with Rene, that spray starch may be your friend here but narrow hems on the wonk are never easy.
Dogs are such a help when dressmaking!

BrendaP

Re: A Bad case of Triangulitis!!!
« Reply #6 on: November 18, 2020, 09:42:59 AM »
It's not a mathematical thing, it's a problem with cutting fabric on the bias, and any triangle has to have at least two sides cut on the bias - not necessarily true bias which is 45 degrees to the grain, but nevertheless bias, or off-grain.

Things that will help are:
Choose a closely woven stable fabric.
Use starch.
Carefully stay stitch the edges - reduce presser foot tension and DON'T pull the fabric as you sew.
Press, don't iron.
Use a fusible interfacing.
Brenda.  My machines are: Corona, a 1953 Singer 201K-3, Caroline, a 1940 Singer 201K-3, Thirza, 1949 Singer 221K, Azilia, 1957 Singer 201K-MK2 and Vera, a Husqvarna 350 SewEasy about 20 years old. Also Bernina 1150 overlocker and Elna 444 Coverstitcher.
http://paternoster.orpheusweb.co.

BrendaP

Re: A Bad case of Triangulitis!!!
« Reply #7 on: November 18, 2020, 09:45:01 AM »
Well if our Notifications thingy worked I would say @BrendaP  !!!

She is the mathematical whizz, a title shared with @Deafoldbat but I suggest you are cutting catawompuss
@Iminei
I didn't get an email notification, but I did see "MyProfile" highlighted at the top of the page.
Brenda.  My machines are: Corona, a 1953 Singer 201K-3, Caroline, a 1940 Singer 201K-3, Thirza, 1949 Singer 221K, Azilia, 1957 Singer 201K-MK2 and Vera, a Husqvarna 350 SewEasy about 20 years old. Also Bernina 1150 overlocker and Elna 444 Coverstitcher.
http://paternoster.orpheusweb.co.

Acorn

Re: A Bad case of Triangulitis!!!
« Reply #8 on: November 18, 2020, 10:11:11 AM »
It's just the email notifications of the notifications that are not working.  Fortunately the onsite stuff is fine.
I might look as though I'm talking to you, but inside my head I'm sewing.

Sewot

Re: A Bad case of Triangulitis!!!
« Reply #9 on: November 18, 2020, 20:17:57 PM »
Thank you all for your help.
Mine eyes hath opened!!!
It seems like cutting on the bias is the problem.
I did use startch with the blue one but only on the edges so next time I will startch the whole piece.
Stay stitching may be a prob as its only a 1/4" hem.
I do remember moving the cloth around as I cut it due to insufficient space but next time I will lay it out on the floor and cut it whilst not moving it.( the cloth that is!!!)
I will startch it and press the hems over whilst it is still lying unmoved.
Who'd have thought such a silly simple thing eh?.

Sewot

Re: A Bad case of Triangulitis!!!
« Reply #10 on: November 18, 2020, 23:09:40 PM »
I have now almost sewn up a main sail.
I have paid attention to all your points except the fusible interfacing as I smellt somehow I am going to mess it right up taking the interfacing off.
Anyways as you can see its a lot straighter.
Not perfect but I never will be and I can live with what I have done.
I enjoyed flipping from the zig zag to straight stitching and think its quite cool.
I achieved a near perfect bias by withdrawing strands of cotton until the warp was straight then drew a line next to it.
I have never worked with Egyptian cotton before but it is lovely stuff to work with.
They seem to make the fabric differently in that there are two distinct colours.
White and dark blue.
This dark blue loses its darkness when woven with the white weft thingies?
It is very clever and easy to sort out where the straights are.
I bought the Egyptian cotton in a thrift shop for $8.00.
It was two pillow cases and and douvet cover.
Thats four quid in UK!!!!
Thats what I call good fun with fabric.
Sewing triangles is not for the faint hearted.
But now????
Huh!!! ....childsplay .
Thanks Peeps.

fajita

Re: A Bad case of Triangulitis!!!
« Reply #11 on: November 18, 2020, 23:14:34 PM »
You could draw your triangle onto your fabric, sew the outline, then cut. Helps a bit. (Bit late for this, but there you go).

Sewot

Re: A Bad case of Triangulitis!!!
« Reply #12 on: November 19, 2020, 00:53:35 AM »
You could draw your triangle onto your fabric, sew the outline, then cut. Helps a bit. (Bit late for this, but there you go).
Thats a good idea ...like stay stitching?
But which side of the stitching do I cut?
Do I keep the stitching on the inside?
Bearing in mind the hem is only 1/4" doubled over.

fajita

Re: A Bad case of Triangulitis!!!
« Reply #13 on: November 19, 2020, 10:00:15 AM »
Cut outside the stitching.

Iminei

Re: A Bad case of Triangulitis!!!
« Reply #14 on: November 19, 2020, 15:22:23 PM »
I think the last two pics looked great and I love the quality of the stitching ... Beaut!
The Imperfect Perfectionist sews again