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A good use of electronics — Parallax Forums

A good use of electronics

computer guycomputer guy Posts: 1,113
edited 2010-05-04 19:54 in General Discussion
I found this on YouTube. It has to be the best use of electronics I have seen.

www.youtube.com/watch?v=E3mzhvMgrLE&NR=1

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Comments

  • davejamesdavejames Posts: 4,047
    edited 2010-05-01 20:56
    ...pretty wild, and very cool.

    Thanks for posting,

    DJ

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  • Peter KG6LSEPeter KG6LSE Posts: 1,383
    edited 2010-05-02 05:48
    I saw ( bad pun ) this at Skills USA 3 years ago and tested with a hot dog too .. Its Awesome!


    Peter KG6LSE

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    peterthethinker.com/tesla/Venom/Venom.html
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  • ElectricAyeElectricAye Posts: 4,561
    edited 2010-05-02 15:24
    Great idea. I wonder how sensitive it is to sweat.
  • SRLMSRLM Posts: 5,045
    edited 2010-05-02 23:05
    Thanks for posting.

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  • UnknownUnknown
    edited 2010-05-03 01:01
    I think it is good that they warn you not to attempt it but I think they could have lost their finger if they were to approach the blade faster.
  • Ken GraceyKen Gracey Posts: 7,401
    edited 2010-05-04 03:50
    Certainly agree. We've got a contractor working in our office for the last couple of months to do some various improvements (get the CNC router room ready, finish our new conference room, move the training room, etc.) and today he was telling me about the new Saw Stop table saws. Besides the finger saver blade, this is supposed to be a really high-quality, precision table saw.

    In fact, there's another video somewhere in which the company owner puts his finger in the blade to trigger the shutoff. He had barely a trickle of blood while he proclaimed "I'll only design these if I trust them with my own fingers" or something along those lines.

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    Ken Gracey
    Parallax Inc.

    Follow me at http://twitter.com/ParallaxKen for some insider news.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2010-05-04 04:59
    Amazing stuff! 'Kinda reminds me of the guy who promoted the original ground fault interrupter by grabbing a live wire and jumping into a swimming pool. That takes confidence in your equipment!

    I wonder how well the Saw Stop is able to grab a fine-toothed blade, like that used for plywood and thin laminates.

    -Phil
  • John R.John R. Posts: 1,376
    edited 2010-05-04 13:18
    It grabs the fine tooth blads just dandy. The actual face of the stop is smooth, the holes are there to help with the "crumple zone" effect. When that aluminum block is shot out, the blad is stopping. A diamond or abbrasive blade might be interesting though.

    Even with a full speed approach, the hot dog doesn't get much of a ding. I don't know if you could move your finger fast enough to get it cut off. The saw trips in .001 seconds. How fast can you have your hand moving? (I'm not going to volunteer to test.)

    I don't have one of these yet, but even without the "sawstop" feature, these saws are awesome.

    Given that a blad runs about $100, plus about $60, the unfortunate thing is that while this will save your digits, it will likely not stop the string of profanities to be heard... smile.gif

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    John R.
    Click here to see my Nomad Build Log
  • W9GFOW9GFO Posts: 4,010
    edited 2010-05-04 13:32
    John R. said...
    Given that a blad runs about $100, plus about $60, the unfortunate thing is that while this will save your digits, it will likely not stop the string of profanities to be heard... smile.gif

    I wonder how many blades have been wasted due to damp wood...

    Rich H

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  • UnknownUnknown
    edited 2010-05-04 15:37
    John R. said...

    Even with a full speed approach, the hot dog doesn't get much of a ding. I don't know if you could move your finger fast enough to get it cut off. The saw trips in .001 seconds. How fast can you have your hand moving? (I'm not going to volunteer to test.)
    I watched the video once but the man looked like he was studying (being careful)·where to put his hand in relationship to the blade.· If you measure it then you might be able to make contact without being pulled in by the blade but I don't want to take that chance and there is such a thing as product failure and losing your fingers.

    The three causes of accidents: I didn't see, I didn't think, I didn't know.
    ·
  • Ken GraceyKen Gracey Posts: 7,401
    edited 2010-05-04 18:16
    Chuckz: I'll add another mode of failure when using power tools: being off balance, or being too casual. This could be "I didn't think".

    For example, a skilled carpenter could be ripping some boards on a table saw and nearing the blade. A loss of balance or technique can put his hands in the wrong place.

    Or, take our CNC milling machines. Both Matt and I showed our new CNC operator Scott the various scars we have from knicking tools in the tool changer. This is done by casually moving hands around the vise, changing fixtures, etc. on a stopped machine. CNC carbide inserts don't necessarily knick your skin - they "hook" it and slice it open. Or, positioning a wrench the wrong way on a Cat40 tool holder could cause you to slide into the tool if the hex key slips out of the socket (perhaps an "I didn't know" error). Some of these mistakes are caused by casualness around tools.

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    Ken Gracey
    Parallax Inc.

    Follow me at http://twitter.com/ParallaxKen for some insider news.

    Post Edited (Ken Gracey (Parallax)) : 5/5/2010 5:08:56 AM GMT
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2010-05-04 19:17
    Ken,

    On the subject of CNC... many times the 'finished' metal piece can have very sharp edges that you would not expect to be sharp. Ever changed a tire on a brand new car? The threads on the wheel hub can be razor sharp... just ask my knuckles.

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
  • LeonLeon Posts: 7,620
    edited 2010-05-04 19:54
    At college many years ago one of our lecturers mentioned a technique they used in the Soviet Union with dangerous machinery like presses: the operator's wrists were attached to chains and his hands were dragged out of the way automatically when the ram came down, if he forgot to remove them. Much cheaper than electronics and just as effective.

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    Leon Heller
    Amateur radio callsign: G1HSM
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