05-06-2019, 09:48 AM
Finishing up the speaker:
I made the centering collar from four strips of 0.010 Teflon material which is what I had on hand and cut each piece successively longer to maintain the same length when wrapped around the pole piece. This resulted in a thickness of nominally 0.040 and the gap appears to actually be closer to 0.038” and when compressed into the slot, fit nice and evenly tight all around.
With this arrangement I was able to easily press the pole piece back in and the resultant gap was beautifully uniform:
Next I used small strips of .007” paper to center the voice coil while I screwed the spider assembly in and glued the edges of the cone. I had to remove the cone center cap to access the voice coil to insert the centering strips:
Continued in next post.
Steve D
I made the centering collar from four strips of 0.010 Teflon material which is what I had on hand and cut each piece successively longer to maintain the same length when wrapped around the pole piece. This resulted in a thickness of nominally 0.040 and the gap appears to actually be closer to 0.038” and when compressed into the slot, fit nice and evenly tight all around.
With this arrangement I was able to easily press the pole piece back in and the resultant gap was beautifully uniform:
Next I used small strips of .007” paper to center the voice coil while I screwed the spider assembly in and glued the edges of the cone. I had to remove the cone center cap to access the voice coil to insert the centering strips:
Continued in next post.
Steve D
