Throat space, normalized across every brand

This is the cluster the site is named for, and it exists because of one specific failure in how this category publishes information.

Throat space is the opening between the needle and the body of the machine: the tunnel a rolled quilt has to pass through. Harp space is the same measurement under a different name. Some manufacturers publish only the width. Some publish width and height. Some publish height first and width second, on a different page of the same website.

The result is that a quilter comparing two machines is frequently comparing two different measurements. Everything in this section exists to fix that for one specific purchase decision.

What throat space is, precisely

Stand in front of a domestic sewing machine. The needle is on the left; the upright body of the machine is on the right. The gap between them - the horizontal distance from the needle to the machine body, and the vertical distance from the bed to the underside of the arm - is the throat.

“Harp space” is a term borrowed from the shape of the arm and means exactly the same thing. If a listing quotes one and a spec sheet quotes the other, they are describing the same tunnel.

The three ways it gets published, all of them real

These are not hypotheticals. Every example below is on a live manufacturer page:

1. Width only. bernette publishes “9″ / 230 mm” for space to the right of the needle on the 79, with no height figure at all. Brother publishes “7.4″ from needle to arm” for the PE900, likewise with no height.
2. Width then height. Brother publishes the SE700 work area as “6.4″ x 4.0″” and the NQ3550W as “8.3″ x 4.1″ of usable space”. Both are width first.
3. Height then width. Brother publishes the PQ1600S needle-to-arm space as “5.7″ x 8.7″”. That is the same manufacturer, on the same website, reversing the order between two product families, with nothing on either page saying which number is which.

Juki is the exception worth naming: it publishes “215(W) x 150(H)mm / 8.5″(W) x 6″(H)” - both units, both dimensions, both labeled. That is what the whole category should look like.

Why the order matters more than it sounds like it should

Because the two dimensions are not interchangeable and the smaller one is what binds. Take three machines that all get sold as roomy:

• Janome MC6700P: 10.04 in wide, 4.72 in high → 47.4 sq in
• Brother PQ1600S: 8.7 in wide, 5.7 in high → 49.6 sq in
• Juki TL-2010Q: 8.5 in wide, 6.0 in high → 51.0 sq in

The order of the three by advertised width is the exact reverse of their order by actual opening. A quilter who bought on the 10-inch headline number bought the smallest throat of the three, and nothing on the page they read would have told them.

How much do you actually need?

It depends on the finished quilt, because what has to fit through the throat is half the quilt rolled up. A lap quilt rolls to something a domestic machine will pass. A king does not, at any width you can buy without a frame. The banded working - throw, twin, queen, king, against throat opening - is on the how-much-do-you-need page, with the arithmetic shown so you can re-run it against your own quilt.

What this section contains

The chart is the reference: every machine on this site, normalized to width by height in inches, with the manufacturer page each figure came from and a note wherever the maker published it in a different order. The roundup turns that into a purchase. The harp versus throat page answers the terminology question in the first sentence, because that is all that question needs.