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Forum LockedStitch Locking ?

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PeteCress View Drop Down
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    Posted: 18 September 2014 at 1:55pm
Disassembling a couple of UV-worn windsurfer sails, I see a lot of this: http://tinyurl.com/n2lhgqh

The Question: 

Is this just a variation on the "go back-and-forth a little to lock the stitches" that we see in most of the vids?    Or is it something more?     

Seems like it's just running some stitches without the foot moving the material.   Maybe a special feature of the commercial machines used to make the sails?    
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MattGrant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattGrant Quote  Post ReplyReply Direct Link To This Post Posted: 18 September 2014 at 2:00pm
You have it right. It is simply a short reverse and then short forward before going full length again. It is a good way to increase stitch and reduce the chances of a seam ripping out completely.
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Matt Grant
Sailrite
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Tejas View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tejas Quote  Post ReplyReply Direct Link To This Post Posted: 18 September 2014 at 2:59pm
Isn't this just a bar tack stitch? There are specialized sewing machines for bar tacking such as for belt-loops on jeans or joining webbing were the joint must exceed the breaking strength of the webbing. In the picture the stitch was probably simulated on a zig zag sewing machine by setting the stitch length short the zig zag to the desired width.

Bar tach is described on wikipedia as:

Bar tack is a series of hand or machine made stitches used for reinforcing areas of stress on a garment, such as pocket openings, bottom of a fly opening or buttonholes. It consists of a series of close-set zig-zag stitches (machine) or whip stitches (hand), usually 1/16"-1/8" in width and 1/4"-3/8" in length. In denim jeans, it is often in a contrasting color, such as orange or white.
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MattGrant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattGrant Quote  Post ReplyReply Direct Link To This Post Posted: 18 September 2014 at 3:03pm
Correct, that is the proper term.
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Matt Grant
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