Topic

How to Mark and Make really long cuts in Fabric.

Viewing 12 posts - 1 through 12 (of 12 total)
Phong D BPL Member
PostedAug 30, 2020 at 1:38 am

I made a bivy sack. I found it very hard to mark a really long cut.  For example, I want to cut a tapered rectangle, whose length is 72 inches, and one width is 32 inches, the shorter width is 24 inches.  Because the taper, I cant fold it in half and cut that…because unfolding it would make kind of a shallow V and not a straight line.  I ended up spreading the fabric on my floor and running a long string and with a 36 inch rule drawing a line, but that did not work very well, the string kept moving and my cut was not very straight.  How do you guys cut things like this?  I am thinking of using my friends ping-pong table as a work station, I don’t really have a desk that long.

PostedAug 30, 2020 at 4:11 am

Yea having a large flat surface is key. A ping pong table would work great! I’ve done larger cuts by laying out the material on my living room floor, holding the corners w/ exercise weights or tape, marking w/ a long straight edge and just cutting by hand w/ scissors. Home Depot has a 98” cutting guide for $25. A drywall T-square works well too. If you have a fabric or sewing store nearby, they might let you use their cutting table?

Jerry Adams BPL Member
PostedAug 30, 2020 at 9:30 am

yeah, I use one of those 98″ cutting guides, intended application is carpentry

I try to tape out the corners of the fabric to keep it flat and not skewed.  Don’t stretch it though.  It’s hard to get tape to stick to silnylon, so I put a weight on top of that.

I find this is the trickiest part of tent projects, laying out the lines so everything is straight.  Also, “measure twice and cut once”.

Nick Gatel BPL Member
PostedAug 30, 2020 at 12:26 pm

Use a chalk line string to snap the long line. It will be perfectly straight is you have enough tension on the string.

I don’t sew, but have used this in large home remodeling projects, such as laying tiles, hanging cabinets, etc.

Chris R BPL Member
PostedAug 30, 2020 at 3:48 pm

I also use an aluminum strip. I mark mine up with the most commonly used dimensions that I use. You can also buy adhesive measuring tapes to turn these in to a super long rule.
You may meant to gently file the corners to ensure there are no sharp edges to damage the fabric.

Dave @ Oware BPL Member
PostedSep 1, 2020 at 12:41 pm

Sampson 6 ft yardstick

chalk line

templates of cardboard

t squares

edge of metal tape measure

Roger Caffin BPL Member
PostedSep 1, 2020 at 8:27 pm

8′ long machined plank for a straight edge.
8 m carpenters tape.
Hardwood floor and sticky tape at the corners.
Felt-nib pen.

Cheers

Michael B BPL Member
PostedSep 3, 2020 at 11:05 pm

I recently started using a soldering iron to cut my synthetic fabrics. With sil- fabrics, it is not a big deal, but my taffetas and the like frayed like crazy using scissors. Taping the corners is crucial to keeping the fabric tight. Long straight edges are not hard to find for marking and cutting the fabric.

Roger Caffin BPL Member
PostedSep 4, 2020 at 12:37 am

soldering iron to cut my synthetic fabrics.
I use a Weller soldering iron: pro, and $$. You can change the tips, either for different temps or for desoldering.
Anyhow, I made a fitting to go into one of the hotter elements, with a small knife blade on it. Then I put a large bit of 3-ply on the floor as a cutting base. A wood straight edge handles the temps.
It all works very well.

Cheers

PostedSep 6, 2020 at 11:20 pm

Ping-Pong Table – 1+ as noted above.
Am in the process of replacing mine, so have to mark and cut fabric on a 5/8″ thick 4’x 8′ fiberboard crawling around the floor with knee pads. Very uncomfortable, so getting the new table installed is priority 1. Although the fiberboard, also called ‘homasote,’ is easy to stick tacks and pins in. If I did not want to spend for a ping-pong table, would consider putting a 4’x 8′ homasote board on legs or blocks for a table. My ‘new’ table was bought from the local classified ads for $75. The 5’x 10′ ping-pong tables are better because they often come on wheels, and the halves fold up so you can roll it against a wall when not in use. The old one came from Walmart, was well over $100, and was not as good quality as the new/used one. The cheap ones are a particle board that absorbs moisture and after a while the tops tend to cave a bit, making it difficult to draw lines accurately.

Both silnylon and silpolyester are sil coated, so cannot use masking and similar tapes. Bought some weights intended for just this purpose of holding the fabric in place, but also use thumb tacks or push pins (outside the seam allowance).

Have several long ALU rulers, 3′, 4′, a nice light skinny 6′ one, a 2 part one that is over 12′ when assembled, and a large ALU T-square. For curved tent seams, use curved rods made of tent pole tube, curtain hooks that attach to the tube ends, and cord that attaches to the hooks to keep the pole bowed.

For cutting, priced hot knives, and the decent ones are high cost. Tried utility knives, but sharpened Fiskars scissors often work better. Keep Fiskars sharpeners handy and use them regularly. You can slide the scissors along the cut line once the cut has been started. Of course, once the cut gets going, the tacks no longer keep the fabric taut, so both hands are needed to keep the fabric flat and cut at the same time. For those with good physical coordination, it is easier. The good news is you most often have a seam allowance, so the cut does not have to be as accurate as the marked seam line.

Before the seam is pinned in place, the seam allowance is trimmed to the needed width. For lap felled seams, if the fabric can hold a folded edge, that is also done with an iron, heat adjusted to make the edge without harming the fabric and its coating. With or without the folded edge, the ends of the seam are formed and tacked to the table, and the process begins of forming and pinning the seam. Pinning the seam with fine pins, when you can only work from one side, takes some practice. (Know that pros don’t have to do all that, but am not and never will be a pro seamster.)

It is a little different if the seam is being tailored right on the partially completed tent. Then just one line of pins is used parallel to the seam line to be sure the cat cut is good and the fabric is taut. Then the work is taken to the table and the seam redone and repinned as above. Note that on lap felled seams, the most used, the pins go in and out inside where the stitch lines will go on each side of the seam.

That Home Depot cutting guide sounds interesting. Will go take a look.

Roger Caffin BPL Member
PostedSep 6, 2020 at 11:56 pm

Know that pros don’t have to do all that, but am not and never will be a pro seamster
Yeah, but usually with much heavier fabric.

Now, how those Asian/Bangaldeshi girls manage to make those UL see-thru frilly silk knickers … dunno.

Cheers

Viewing 12 posts - 1 through 12 (of 12 total)
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