Quilting Basics : Half Square Triangles (HSTs)

Half square triangles are another important subunit in making quilt blocks and quilts.  A half square triangle block is a square made of two different fabrics, so that each fabric forms half the square joining along the diagonal.

This instructable shows how to construct a half square triangle block from 2 squares of fabric so that they are ready to be used in a quilt.  Calculating the correct size of starting square to end up with the desired finished size is also discussed.  After following this instructable a student should be able to construct half square triangle units as used in many traditional quilt blocks.

Step 1: Materials

2 squares of cotton fabric the same size

washable fabric marking pen or pencil
ruler

sewing machine
thread

or needle and thread if you hand piece (i.e. no sewing machine)

Iron
Ironing board

Scissors
Rotary cutter (not absolutely necessary, but makes cutting squares much faster)

My sewing instructions will all be for machine piecing, but the basic idea, cutting, pressing and layout are the same for hand piecing.

Comments

[reikimaster5555]

I've made about 6 or 7 quilts in the past 15 years, but all have been with blocks. Lately I've been looking at different patterns and they seemed alittle hard. With these instructions, not so much. What I thought would be a challenge now seems do-able . Thanks for giving great instructions and the confidence to do it. Would appreciate any other quilting tips you might have up your sleeves. Thanks: )

[lizzyastro]

Thank you for your kind comments. I do have some more instructables for basic units planned, I just need to find the time to take the photographs!

[wilgubeast]

This is an excellent write-up. And your learning objective is so concise! Looks good. Don't forget to show us the finished project (if there is one) in the comments or in a new Instructable.

[lizzyastro]

Thank you! Here are two photos showing the finished project a Spring/Easter Wall hanging for the lobby at work.  

The block is from the Swoon pattern which simply uses squares, half square triangles and flying geese, so you could make this by following my already published Quilting Basics Instructables!

The finished wall hanging measures 24" x 36"

[bajablue]

Beautiful work!

You may want to edit this Ible and add these pictures as Wilgubeast suggested.

Personally, I think the close-up picture would work perfectly as the Intro picture.

Good Luck in the Challenge!!! ;-)

[bajablue]

Just a suggestion, but you might also want to add more keywords during the edit, such as:

How to, make, sew, DIY, easy quilting, technique (etc).

This will increase the number of visitors to your wonderful instructable. ;-)

[lizzyastro]

Thanks for the advice bajablue, I guess I tend not to be very good at blowing my own trumpet! I shall take a better detail picture showing the HST in situ and use that as you suggest.

[bajablue]

You're so welcome.

ha ha ha... lemme help you out with that horn business. ;-)

[jessyratfink]

Very smart technique!

[lizzyastro]

Thanks, it isn't difficult to do, but so much easier to explain with photos as well.