Review: Karl Grim Solderable Thread

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RESISTANCE

  • hand sewn 8” trace has a resistance of 7 ohms
  • machine sewn top thread 4” trace before thread broke has a resistance of 1 ohms
  • machine sewn bottom thread 8” trace has a resistance of 1 ohms

THREAD QUALITY

  • difficult to thread a size 24 crewel needle
  • frays and whiskers
  • medium ease to sew by hand, breaks as a top thread, snags a bit as a bobbin thread
  • thread is wound on a plastic bobbin and has to be rewound on a bobbin which matches your sewing machine’s specifications

 
RECCOMENDATIONS

MANUFACTURER
Karl Grimm
 

Hand sewn LED circuit on cotton broad cloth with felt backing.
Positive and negative traces are 8 inches long.

 
Threads a crewel needle size 24 easily.
Jonh James Chenille Hand Sewing Needle Size 24
 
Hand sews a basic running stitch with few tangles or difficulties.
Karl Grimm Solderable Conductive Thread Review with LED Circuit
 
1.8mm blue LED with 4 tight loops around the LED leads.
Karl Grimm Solderable Conductive Thread Review with LED Circuit
 
Use a fresh 3V CR2032 battery to power the circuit.
LED glows = empirical evidence that the thread is conductive
Karl Grimm Solderable Conductive Thread Review with LED Circuit
 
Machine Stitching with a Schmetz Embroidery Needle 90/14
Schmetez Embroidery Needle for Berninia Home Sewing Machine

 
Machine stitching sample
top trace is Mitsifuji thread as top thread
bottom trace is Mitsifuji thread as bobbin thread
both methods sew smoothly without snags or fraying
Karl Grimm Solderable Conductive Thread Review with LED Circuit
 

The reverse side of the machine sewing sample
Karl Grimm Solderable Conductive Thread Review with LED Circuit
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