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  1. TwstLok

    Brushes throwing excessive sparks

    Ok, just called a couple local places. Looks like I wont be watching anyone do anything for $120/hr. However, one of the gentlemen were nice enough to listen for a moment. Seems my continuity between all bars on the commutator is a good thing, as is the isolation between the bars and the shaft...
  2. TwstLok

    Brushes throwing excessive sparks

    BK, Ok, so I got to tinkering with it again. I cleaned the commutator. All clean between each bar. I have total continuity between all bars on the commutator. I didn't think that was supposed to be the case but I guess so. Also, between the commutator and the shaft, I have no continuity or no...
  3. TwstLok

    Brushes throwing excessive sparks

    BK, That was an interesting one about grit getting between the comm bars and causing a short. I hadn't thought of that one but like I said, I'm not an electric motor guy. But what you described is a very good possibility. Lots of great suggestions on here. Thanks
  4. TwstLok

    Brushes throwing excessive sparks

    BK, Thanks for that! Ya, these are cheap armatures out of power tools. I've priced new ones, like $40 each. Certainly not worth my time at all, not to mention the several hours I've already devoted to them. It's simply the principle of the matter. I just want to know what the problem is. Just...
  5. TwstLok

    Need some coil advice

    Thanks for the response. Didn't think of checking the arrl site. no, I'm not trying to make a "shorter" 2m antenna. What I meant was, if I'm going to practice with coils/antennas, would the formulas be the same for 2m as they would for hf. That way I can tinker with 20" of wire in the house...
  6. TwstLok

    Need some coil advice

    Hi all. I'm looking to tinker with coils for use with vertical antennas in the ham radio HF spectrum. I currently have a Butternut HF6V vertical that uses coils for changing resonant frequencies on the various bands. These coils are 1/4"O.D. aluminum tubing. I purchased a roll of this stuff in...
  7. TwstLok

    Brushes throwing excessive sparks

    Hello all. Amongst many other duties, I'm responsible for repairing all power tools for our company. I basically learned by cracking them open and using my head. THis has worked well for several years...until recently. After working on a Milwaukee portable bandsaw, I fired it up to test it. I...

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