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A tuck can be created when a previous row is knit together, stitch by stitch, with the present row. This forms a round ridge that projects outwards from the face of the fabric, and is used as a decorative detail. Tuck stitches are created by working in hand knitting by working into the stitch immediately below the next stitch waiting on the needle.
Sheet metal joints might be made on a seam welding machine where weld purging is carried out automatically as part of the machine design. Where sheet metal is formed into tanks or vessels prior to welding, the inside of the vessel can be purged with a flow of inert gas, however for larger sizes the cost of the gas and the time taken is unrealistic.
There are two modes for seam welding: Intermittent and continuous. In intermittent seam welding, the wheels advance to the desired position and stop to make each weld. This process continues until the desired length of the weld is reached. In continuous seam welding, the wheels continue to roll as each weld is made.
Plain seam A seam or seamline in sewing is the line where two pieces of fabric are held together by thread. seam allowance A seam allowance is the area between the edge of fabric and the stitching line on two (or more) pieces of material being stitched together. Seam allowances can range from 1/4 inch wide (6.35 mm) to as much as several inches.
A modern industrial knitting machine in action industrial circular knitting fabric machines. A knitting machine is a device used to create knitted fabrics in a semi or fully automated fashion. There are numerous types of knitting machines, ranging from simple spool or board templates with no moving parts to highly complex mechanisms controlled ...
The term "gauge" is used in knitting to describe the fineness size of knitting machines. It is used in both hand knitting and machine knitting. The phrase in both instances refers to the number of stitches per inch rather than the size of the finished article of clothing. The gauge is calculated by counting the stitches (for hand knitting) or ...
The selvage of a knitted fabric consists of the stitch(es) that end each row ("course") of knitting. Also called selvedge, the term derives from "self-edge". The selvage may be considered finished; it may also be used in seaming garments, or finished and reinforced using crochet or other techniques.
A successful orbital weld is 100% automatic and repeatable as long as the operator monitors variables and performs periodic inspections of the weld seam for complete penetration of the weld. Noticing that a variable has changed during the welding process is a necessary skill for orbital welding technicians and operators that can be easily missed.