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2. Presser foot - Wikipedia

   en.wikipedia.org/wiki/Presser_foot

   A sewing machine presser foot. A presser foot is an attachment used with sewing machines to hold fabric flat as it is fed through the machine and stitched. Sewing machines have feed dogs in the bed of the machine to provide traction and move the fabric as it is fed through the machine, while the sewer provides extra support for the fabric by guiding it with one hand.

3. Feed dog - Wikipedia

   en.wikipedia.org/wiki/Feed_dog

   A set of feed dogs typically resembles two or three short, thin metal bars, crosscut with diagonal teeth, which move both front to back and up and down in slots in a sewing machine's needle plate: front to back to advance fabric gripped between the dogs and the presser foot toward the needle, and up and down to recess at the end of their stroke, release the fabric, and remain recessed while ...

4. Shore durometer - Wikipedia

   en.wikipedia.org/wiki/Shore_durometer

   For measuring Shore A the foot indents the material while for Shore D the foot penetrates the surface of the material. Material for testing needs to be in laboratory climate storage at least one hour before testing. Measuring time is 15s. Force is 1 kg +0.1 kg for Shore A, and 5 kg +0.5 kg for Shore D. Five measurements need to be taken.

5. The Goriest Defense Mechanism of Any Animal - AOL

   www.aol.com/goriest-defense-mechanism-animal...

   When you think of “gory” animals, creatures like great white sharks, tigers, and vampire bats might come to mind. But the most gruesome defense mechanism of any animal belongs to something ...

6. Walking foot - Wikipedia

   en.wikipedia.org/wiki/Walking_foot

   Walking foot. A walking foot is a mechanism for feeding the workpiece through a sewing machine as it is being stitched. It is most useful for sewing heavy materials where needle feed is mechanically inadequate, for spongy or cushioned materials where lifting the foot out of contact with the material helps in the feeding action, and for sewing many layers together where a drop feed will cause ...

7. Guide number - Wikipedia

   en.wikipedia.org/wiki/Guide_number

   The guide number here (full power setting, ISO 100, and normal-angle coverage) is 37 for calculations made in meters (yellow arrow) and 120 for feet (orange). For instance, on the foot scale, f /4 × 30 ft = 120, as do both f /8 × 15 ft and f /16 × 7.5 ft.