S.BatessMagneticYarn History

Hide minor edits - Show changes to markup

March 11, 2010, at 01:59 AM by 18.111.8.160 -
Changed line 38 from:

Re-imagining the fundamental yarns of a textile provides an opportunity to think about embedded intent and actuation schemes. We have seen in class materials that sense and communicate, but what about textiles that 'do'? Nitinol wire has traditionally been the first approach to this question, but large switching times and required currents continue to be obstacles to adoption. Here we explore the first steps of incorporating magnetic components as an eventual alternative.

to:

Re-imagining the fundamental yarns of a textile provides an opportunity to think about embedded intent and actuation schemes. We have seen in class materials that sense and communicate, but what about textiles that 'do' ? Nitinol wire has traditionally been the first approach to this question, but large switching times and required currents continue to be obstacles to adoption. Here we explore the first steps of incorporating magnetic components as an eventual alternative.

March 11, 2010, at 01:58 AM by 18.111.8.160 -
Changed lines 52-54 from:

EMY2:

Conductive thread was dip coated in a polymerizing silicone rubber and was removed after 6,7, and 8 minutes respectively.

to:

EMY2: Conductive thread was dip coated in a polymerizing silicone rubber and was removed after 6,7, and 8 minutes respectively. This was done to determine whether this could be a viable option to replace the coated copper wire. This has been ruled out for the time being.

Added line 58:
March 11, 2010, at 01:54 AM by 18.111.8.160 -
Deleted lines 39-59:

Data

Measure and report the following properties (if they are relevant for your yarn): diameter (micrometers) total length of yarn (meters or yards) ply fiber length (millimeters) twist direction twist (turns per inch) conductivity (ohms per centimeter or ohms per inch)

Bonus points for measuring any of the following properties and explaining how you did so: denier or tex yarn size tenacity elongation elastic recovery absorbency

Changed lines 47-48 from:

Cotton balls were unrolled and laid on top of each other with ends fanned out. The cotton was then hand spun by twisting an S twist. Copper wire was then twisted as a Z twist and coiled ~120 times every few centimeters.

to:

Cotton balls were unrolled and laid on top of each other with ends fanned out. The cotton was then hand spun by twisting an S twist. Copper wire was then twisted as a Z twist and coiled ~120 times every few centimeters. The entire piece has a resistance of less than 30 ohms. The entire yarn is insulated and is only conductive end to end.

Added line 58:
Added line 60:

With its short fibers and ease of untwisting, cotton proved challenging to use. We hypothesize that the electromagnetic would be stronger if the coils were around a ferromagnetic material rather than an air core. Fortunately our work with steel wool puts us in a good position to test this theory within the next iteration. Incorporating permanent magnets should be delayed until order of magnitude estimates are completed to determine sizing.

March 11, 2010, at 01:46 AM by 18.111.8.160 -
Added line 37:
Changed lines 64-65 from:

Two spun strands were twisted, one entirely cotton and the other cotton, alternating with steel wool or steel wool with small magnet.

to:

Two spun strands were twisted, one entirely cotton and the other cotton, alternating with steel wool or steel wool with small magnet. After being twisted together, additional cotton and steel wool were added around both strands to help with cohesion and keeping the magnets in place.

Changed lines 68-69 from:

Cotton balls were unrolled and laid on top of each other with ends fanned out. The cotton was then hand spun by twisting a _ twist. Copper wire was then twisted as a __ twist and coiled every few centimeters.

to:

Cotton balls were unrolled and laid on top of each other with ends fanned out. The cotton was then hand spun by twisting an S twist. Copper wire was then twisted as a Z twist and coiled ~120 times every few centimeters.

Added lines 71-72:

Note that a .5 T magnet did interact with the electomagnet enough to pick up the end when the current through the yarn was approximately 600 mA.

March 11, 2010, at 01:40 AM by 18.111.8.160 -
Changed line 3 from:

These yarns seems to have a mind of their own!

to:

These yarns seem to have a mind of their own!

Changed line 32 from:
  • 6 in. yarn incorporating materials
to:
  • 6 in. yarn incorporating all above materials
Changed lines 35-42 from:

Role of Conductive Fabrics

to:

Motivation Re-imagining the fundamental yarns of a textile provides an opportunity to think about embedded intent and actuation schemes. We have seen in class materials that sense and communicate, but what about textiles that 'do'? Nitinol wire has traditionally been the first approach to this question, but large switching times and required currents continue to be obstacles to adoption. Here we explore the first steps of incorporating magnetic components as an eventual alternative.

Changed lines 63-64 from:

two ___ were twisted, one entirely cotton and the other cotton, alternating with steel wool or steel wool with small magnet.

to:

Two spun strands were twisted, one entirely cotton and the other cotton, alternating with steel wool or steel wool with small magnet.

Added line 69:
Added line 75:
March 11, 2010, at 01:23 AM by 18.111.8.160 -
Changed lines 36-37 from:
to:
March 11, 2010, at 01:16 AM by 18.111.8.160 -
Changed line 35 from:
to:
March 11, 2010, at 01:14 AM by 18.111.8.160 -
Changed lines 18-19 from:

[+Electromagnetic Yarn: Prototype 1 (EMY1)Features:+ ]

to:

Electromagnetic Yarn: Prototype 1 (EMY1) Features:

Changed lines 27-28 from:

Electromagnetic Yarn: Prototype 2 (EMY2)Features:

to:

Electromagnetic Yarn: Prototype 2 (EMY2) Features:

Changed lines 35-39 from:
to:
Deleted line 41:

In this project we take advantage of textiles as optimum engineering materials that provide integrated functionality, parallel construction leading to robustness, and user friendly softness.

March 11, 2010, at 01:13 AM by 18.111.8.160 -
Added line 4:
March 10, 2010, at 06:37 AM by Sarah Bates -
Added line 11:
Added line 16:
Added line 18:
Added line 25:
Added line 27:
Changed lines 39-41 from:

Datat

to:

Data

Measure and report the following properties (if they are relevant for your yarn): diameter (micrometers) total length of yarn (meters or yards) ply fiber length (millimeters) twist direction twist (turns per inch) conductivity (ohms per centimeter or ohms per inch)

Bonus points for measuring any of the following properties and explaining how you did so: denier or tex yarn size tenacity elongation elastic recovery absorbency

Changed lines 61-62 from:

The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 kilo-ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded. When a conductive thread was used (as in connecting the battery terminal to the rest of the circuit), at least one other path was also sewn. This ensures that even if the purse experiences a small tear, the circuit may still survive.

to:

MY: two ___ were twisted, one entirely cotton and the other cotton, alternating with steel wool or steel wool with small magnet.

EMY 1: Cotton balls were unrolled and laid on top of each other with ends fanned out. The cotton was then hand spun by twisting a _ twist. Copper wire was then twisted as a __ twist and coiled every few centimeters.

EMY2:

Conductive thread was dip coated in a polymerizing silicone rubber and was removed after 6,7, and 8 minutes respectively. Techniques from MY and EMY1 were combined, unfortunately unsuccessfully. THe magnets selected were too strong and the yarn would not remain in the desired static position.

Deleted lines 72-73:

The movement of the lid was neglected in the design, so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the lid, the LED may tilt up as opposed to down into the purse. One solution might be pushing the LED farther into the purse and bending it further into the purse before sewing down the mounts. Finally, the lid requires an inside hook to clasp the purse closed during transit.

March 10, 2010, at 06:30 AM by Sarah Bates -
Changed line 10 from:

Features: Magnetic Yarn (MY)

to:

Magnetic Yarn (MY)Features:

Changed line 15 from:

Features: Electromagnetic Yarn: Prototype 1 (EMY1)

to:

[+Electromagnetic Yarn: Prototype 1 (EMY1)Features:+ ]

Changed line 22 from:

Features: Electromagnetic Yarn: Prototype 2 (EMY2)

to:

Electromagnetic Yarn: Prototype 2 (EMY2)Features:

Changed lines 34-35 from:

Circuit http://newtextiles.media.mit.edu/uploads/S/Smaller2.jpg

to:

Datat

March 10, 2010, at 06:29 AM by Sarah Bates -
Deleted line 13:
Deleted line 14:
Deleted line 21:
Changed lines 25-27 from:
  • In development
    • 6 in yarn incorporating materials
    • 36 in silicone dip-coated conductive thread
to:
  • In development:
    • 6 in. yarn incorporating materials
    • 36 in. silicone dip-coated conductive thread
March 10, 2010, at 06:29 AM by Sarah Bates -
Changed lines 3-6 from:

These yarns seems to have a mind of their own.

http://newtextiles.media.mit.edu/uploads/S/Smaller1.jpg

to:

These yarns seems to have a mind of their own!

Changed lines 29-30 from:

-6 in yarn incorporating materials -36 in silicone dip-coated conductive thread

to:
  • 6 in yarn incorporating materials
  • 36 in silicone dip-coated conductive thread
March 10, 2010, at 06:28 AM by Sarah Bates -
Changed line 13 from:
  • Cotton, Steel Fibers, and Neodynium Magnets
to:
  • Cotton, Steel Fibers, and Neodymium Magnets
Changed line 21 from:
  • Electromagnets lend thems selves well to the form factor of yarn and this 23 inch cord featuring 21 "beads" of coiled copper will behave as one.
to:
  • Electromagnets lend themselves well to the form factor of yarn and this 23 inch cord featuring 21 "beads" of coiled copper will behave as one.
Added lines 26-32:

Features: Electromagnetic Yarn: Prototype 2 (EMY2)

  • Cotton, Steel Fibers, Coated Copper Wire, and Neodymium Magnets
  • Conceptually bunching and unbunching possible
  • In development

-6 in yarn incorporating materials -36 in silicone dip-coated conductive thread

March 10, 2010, at 05:53 AM by Sarah Bates -
Changed lines 22-25 from:
  • Over 2500 coils
to:
  • Over 2500 coils with area <20mm^2!
  • Electromagnets can be re-oriented to direct field lines conveniently.
  • Copper wire allows high current without burning up
  • Actuation (bunching) may be possible
March 10, 2010, at 05:49 AM by Sarah Bates -
Changed lines 21-22 from:
  • Over the 18in length, the yarn is insulating. However because of 1 inch conductive (10-100 ohm) patches, the yarn's resistance is sensitive to posture and internal connection.
  • Can be attached to any ferromagnetic surface (like your refrigerator)
to:
  • Electromagnets lend thems selves well to the form factor of yarn and this 23 inch cord featuring 21 "beads" of coiled copper will behave as one.
  • Over 2500 coils
March 10, 2010, at 03:00 AM by Sarah Bates -
Changed lines 11-13 from:
to:
Added lines 16-17:
March 10, 2010, at 01:10 AM by Sarah Bates -
Added lines 11-12:
March 10, 2010, at 01:06 AM by Sarah Bates -
Changed line 7 from:

Operating Instructions

to:

Yarn

March 10, 2010, at 01:06 AM by Sarah Bates -
Changed lines 1-36 from:

Hi

to:

Magnetic Yarn

These yarns seems to have a mind of their own.

http://newtextiles.media.mit.edu/uploads/S/Smaller1.jpg

Operating Instructions

  1. Magnetic Yarn
  2. Electromagnetic Yarn: Prototype 1
  3. Electromagnetic Yarn: Prototype 2

Features: Magnetic Yarn (MY)

  • Cotton, Steel Fibers, and Neodynium Magnets
  • Over the 18in length, the yarn is insulating. However because of 1 inch conductive (10-100 ohm) patches, the yarn's resistance is sensitive to posture and internal connection.
  • Can be attached to any ferromagnetic surface (like your refrigerator)

Features: Electromagnetic Yarn: Prototype 1 (EMY1)

  • Cotton, and Coated Copper Wire
  • Over the 18in length, the yarn is insulating. However because of 1 inch conductive (10-100 ohm) patches, the yarn's resistance is sensitive to posture and internal connection.
  • Can be attached to any ferromagnetic surface (like your refrigerator)

_______________________________________________________________________________________________

Role of Conductive Fabrics

In this project we take advantage of textiles as optimum engineering materials that provide integrated functionality, parallel construction leading to robustness, and user friendly softness.

Circuit http://newtextiles.media.mit.edu/uploads/S/Smaller2.jpg

Construction

The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 kilo-ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded. When a conductive thread was used (as in connecting the battery terminal to the rest of the circuit), at least one other path was also sewn. This ensures that even if the purse experiences a small tear, the circuit may still survive.

Opportunities for Improvement

The movement of the lid was neglected in the design, so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the lid, the LED may tilt up as opposed to down into the purse. One solution might be pushing the LED farther into the purse and bending it further into the purse before sewing down the mounts. Finally, the lid requires an inside hook to clasp the purse closed during transit.

March 10, 2010, at 12:11 AM by Sarah Bates -
Added line 1:

Hi