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screwgun triggers

Discussion in 'Electronic Basics' started by Michael Robinson, Aug 16, 2013.

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  1. I have a cordless impact driver and drill set I use all the time. How does
    the speed control in the trigger work, is it just a rheostat? It's been a
    long time since I took a drill apart, but I don't remember seeing any active
    circuitry.
     
  2. Tom Biasi

    Tom Biasi Guest

    I haven't taken one apart for a while but the last time I did it was a
    little PWM circuit.

    Tom
     
  3. I've always wondered. I bought my Black & Decker drill in 1975 and it has
    variable speed (but doesnt' reverse). It's trigger is a very small
    package, and I don't see anything elsewhere, but it can't be a rheostat,
    too small for that too.

    Michael
     
  4. I think that occurred to me at one point. I think I paid $25 Canadian for
    this drill in 1975, and the only thing I've had to do to it was replace
    the brushes about 20 years ago.

    About five years back, I found another Black & Decker drill about the same
    vintage (still a metal case) for $3 at a garage sale, bought it as backup.
    And then found another one of the same vintage in the garbage when the
    students moved out. One of the others at least has the reversing switch.
    But now, I have one to leav in my drill press adapter.

    Michael
     
  5. This is cordless (DC) equipment I'm inquiring about. I can see putting an
    SCR in a drill that runs on AC. What circuit do _cordless_ drills or impact
    drivers use?
     
  6. Paul Conners

    Paul Conners Guest

    SCR speed control, all in the trigger housing. I've had to replace
    I did something similar with Milwaukee battery sockets (on the bottom of the
    18V drills). I've epoxied these adapters in Bosch and other 18V drills & saws
    that someone is throwing away. Now all take the M 18V battery pack.
     
  7. ehsjr

    ehsjr Guest

    PWM, as Tom stated in the first reply.

    Mike Terrell was replying to Mike Black about his 1975 B&D drill,
    which is was not cordless. In Mike Terrell's reply to you, his
    answer was PWM.

    Ed
     
  8. That might be, though back in 1975, I don't recall power mosfets.

    And while the variable speed isn't perfect, I think it's too smooth to be
    a rheosstat (or a mosfet or transistor acting as a variable resistor).

    Michael
     
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