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  • Users: bassnut
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  1. bassnut

    Surface Finish On Polycarbonate

    My injection molding supplier is having a hard time getting a good finish on the critical face of my parts. The finish appears grainy and with magnifaction small, almost microscopic craters are visable on the surface. The surface of the die is polished smooth however. Are these being created by...
  2. bassnut

    Source for Lexan resin?

    Where can I get a small quantity of black pre-dyed Lexan 141? The company doing some injection molding for me is having a hard time getting a good finish on the parts. There are tiny specks of what looks like splay on the face. He's having a hard tome getting a clean black finish mixing black...
  3. bassnut

    Insulating Steel Laminations

    I've got some steel lamintaion strips that are used in a guitar pickup to cut down on eddy currents when transfering magnetic flux from the magnets to the pole pieces. They're about .027 thick and stacked about 8 high. I've been insulating them with varnish and it's a little too labor intensive...
  4. bassnut

    Alnico vs Ceramic in Guitar Pickups

    This is an old discussion among guitar players and pickup makers who are into "vintage" hardware. The usual belief is that Alnico V sounds "sweeter" in a pickup and ceramic is harsh. I've heard people say it depends on the design and not the magnet...flux is flux. My question is that if Alnico V...
  5. bassnut

    Audio Circuit Design Software

    Is there software available to design and test simple audio circuits such as for electric guitars etc.? All that I'd require would be to plug in different value pots, caps, resistors, wire and some switches and maybe a coil (pickup) or two. In short...nothing to fancy.
  6. bassnut

    Laminates, eddy currents, hysteresis, hysteria etc.

    I'm making bass guitar pickups of and old (expensive) design. It's acutally a recreation of a vintage pickup employed in the '50s and '60s. The design utilises laminations with cylindrical steel pole pieces running through them as well as a wire coil underneath. Alnico bar magnets are situated...
  7. bassnut

    Alnico Magnets

    I'm using alnico 5 bar magnets in a guitar pickup (coil etc.) I have 2 barmagnets side by side with cylindrical pole pieces running perpendicular to the bars between them. The magnets are facing each other N to N or S to S. The belief among many pickup makers is that alnico looses flux over...
  8. bassnut

    AC Small Motor Speed Control

    This should be easy for you guys. I have a small Coweco coil winding machine powered by a 1/10 HP Bodine AC motor. I bought this machine used (vintage '67) and its speed control pot had been removed. I bought a simple foot pedal speed control from McMaster-Carr which works quite well but I'd...
  9. bassnut

    Moulding and dyed Lexan

    I have a supplier who seems to be a little over his head with the polycarbonate thing. He has produced some excellent parts with ABS but I was having problems with cosmetics. i.e. scrathes and dings. There was also a need to use a higher temp. resistant mat'l. The part in question is dyed black...
  10. bassnut

    Guitar Pickup Magnetics

    I'm building a bass guitar pickup of an older design which uses two bar magnets on either side of steel laminations with steel cylindical pole pieces running through the laminations and a copper coil. Could somebody tell me which is the best material to use for the laminations and pole pieces...
  11. bassnut

    Guitar Pickup Magnetics

    I'm building a bass guitar pickup of an older design which uses two bar magnets on either side of steel laminations with steel cylindical pole pieces running through the laminations and a copper coil. Could somebody tell me whick is the best material to use for the laminations and pole pieces? I...
  12. bassnut

    Shimmy Die

    I just finished designing a Brehn type shimmy die (for fun). The die is designed to do a simple trim on a drawn shell. Has anybody out there had any experiences with designing and using this type of tooling and if so what are some of possible problems that could occur? (please exclude the...

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