Page 1 of 2 12 LastLast
Results 1 to 10 of 18
  1. #1
    Elite Member Shield Arc's Avatar
    Join Date
    Jan 2009
    Posts
    3,684
    Location
    Figuring the picking points of jelly donuts.
    Tractor
    John Deere, 4200

    Default Laser sight question.

    Probably about to make a fool of myself. I Googled it but came up with nothing. My 14-year old grandson came by yesterday to show me a project he did in Jr. high wood shop. He was saying during shop orientation the shop teacher was talking about a safety class he went to where they had laser sights on the saws, if you placed your hand under the laser sight the saw would not turn on!
    Anybody ever hear of this? Or is my grandson pulling papa's leg?


    Miller Dynasty 300.
    Lincoln V350-Pro w/pulse
    LF-72
    Lincoln SG Spool gun

    Lincoln LN-25.
    1937 IdealArc-300
    Everlast PowerArc 200.
    5 Lincoln SA-200s.
    1800 Ellis saw
    Hypertherm Powermax 1250, CNC table.
    PROFAX Welding Positioner.
    JD2 model 3

  2. #2
    Gold Member uglyboywith11fingers's Avatar
    Join Date
    Sep 2011
    Posts
    357
    Location
    Georgetown, Ontario
    Tractor
    2007 BX24TLB, 1998 TG1860G

    Default Re: Laser sight question.

    at first thought, maybe a safety feature for equipment in school shops ???
    on second thought, how can the sensor distinguish between a hand and a piece of lumber ?

    Pete

  3. #3
    Elite Member Shield Arc's Avatar
    Join Date
    Jan 2009
    Posts
    3,684
    Location
    Figuring the picking points of jelly donuts.
    Tractor
    John Deere, 4200

    Default Re: Laser sight question.

    Quote Originally Posted by uglyboywith11fingers View Post
    how can the sensor distinguish between a hand and a piece of lumber ?
    Boy you got me! But I do good to turn this computer on in the morning.


    Miller Dynasty 300.
    Lincoln V350-Pro w/pulse
    LF-72
    Lincoln SG Spool gun

    Lincoln LN-25.
    1937 IdealArc-300
    Everlast PowerArc 200.
    5 Lincoln SA-200s.
    1800 Ellis saw
    Hypertherm Powermax 1250, CNC table.
    PROFAX Welding Positioner.
    JD2 model 3

  4. #4
    J_J
    J_J is online now
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    15,795
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Laser sight question.

    Don't know how it works, but it does say it gives a warning.

    The laser saw guide provides an instant warning should the operators hand or fingers be in danger.

    Laser Us Inc - Laser Saw Guides

    Some laser saws activate when the saw is running as it is mounted on the arbor.

    Other laser pointers use a switch to turn the laser on /off.

    I believe the safety part is that if you see the laser is on your hand, you,using common sense will not pull /let down the saw.

    Here is a capacitive type safety saw.

    http://www.youtube.com/watch?feature...&v=esnQwVZOrUU

    http://www.sawstop.com/how-it-works/
    Last edited by J_J; 12-14-2012 at 11:12 AM.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    Gold Member uglyboywith11fingers's Avatar
    Join Date
    Sep 2011
    Posts
    357
    Location
    Georgetown, Ontario
    Tractor
    2007 BX24TLB, 1998 TG1860G

    Default Re: Laser sight question.

    I imagine you still need to have your eyes open to see the red line across your fingers...

    Pete

  6. #6
    Super Member texasjohn's Avatar
    Join Date
    Oct 2005
    Posts
    5,043
    Location
    Central Texas, Jarrell
    Tractor
    Kubota 5030HSTC

    Default Re: Laser sight question.

    Interesting...how does it work

    Motion detection....nope, it's mounted on the saw blade itself and saw dust moves

    Heat detection....nope, blade heats up in operation, wouldn't it stop??

    And, all at an affordable price!
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  7. #7
    Elite Member Shield Arc's Avatar
    Join Date
    Jan 2009
    Posts
    3,684
    Location
    Figuring the picking points of jelly donuts.
    Tractor
    John Deere, 4200

    Default Re: Laser sight question.

    JJ he did say something about testing the laser with a hot dog.


    Miller Dynasty 300.
    Lincoln V350-Pro w/pulse
    LF-72
    Lincoln SG Spool gun

    Lincoln LN-25.
    1937 IdealArc-300
    Everlast PowerArc 200.
    5 Lincoln SA-200s.
    1800 Ellis saw
    Hypertherm Powermax 1250, CNC table.
    PROFAX Welding Positioner.
    JD2 model 3

  8. #8
    Super Member Scooby074's Avatar
    Join Date
    Aug 2006
    Posts
    5,670
    Location
    Nova Scotia
    Tractor
    BX 25, ZD 326

    Default Re: Laser sight question.

    In finger safe tablesaws, Sawstop is the dominant technology. He uses a combination of capacitance sensors and a brake cartridge to drop the saw. He (Gass the company founder) the guy that did the hotdog tests.

    There are some competing technologies, a new one, and possibly the one your grandson is talking about is called Whirlwind. Whirlwind Tool Patents Pending Saw Safety Technology. His system is based conductive plastic on the guard, sort of like a touch lamp, so he can get around Gass's patents. Problem is, the guard needs to be installed for the system to work. That is a major inconvienance for some types of cuts. There are a ring of LED's around the blade guard, perhaps that's what your gandson saw? AFAIK, Whirlwind is only a prototype.

    The bigger problem is, Gass has SO MANY (unjust IMHO) patents on finger safe saws that its virtually impossible for a competitor to get his foot in the door. He's a patent lawyer by trade and has anything remotely related to his system locked up tight. Matter of fact, he was lobbying California to MANDATE his safe saws and have traditional saws declared "illegal" and unsafe. In the woodworking world, there is not a whole lot of love for Gass.

    Whirlwind:


  9. #9
    Platinum Member Scotty Dive's Avatar
    Join Date
    Feb 2010
    Posts
    775
    Location
    Ct
    Tractor
    Yanmar 2020D

    Default Re: Laser sight question.

    yup...saw stop...watch this one....the designer puts his own finger to show how it works...

    Time Warp - SawStop - Snotr
    Thanks,

    Scotty Dive
    Yanmar YM2020D "Git er Done Too"
    Pictures! http://s139.photobucket.com/albums/q...t=dfc00199.pbw
    Yanmar Tractor Database - Click Link, then click file and download the excel file.: https://drive.google.com/file/d/0BxR...it?usp=sharing

  10. #10
    Gold Member
    Join Date
    Feb 2010
    Posts
    314
    Location
    Western NY

    Default Re: Laser sight question.

    The reflectance and scatter off of skin is very different compared to a piece of word.

Page 1 of 2 12 LastLast

Similar Threads

  1. Got laser?
    By bcp in forum Build-It Yourself
    Replies: 16
    Last Post: 11-22-2012, 08:13 AM
  2. Hydraulic sight glass question
    By Wacky in forum Massey Ferguson Owning/Operating
    Replies: 4
    Last Post: 06-28-2010, 08:15 PM
  3. Got laser?
    By 4440 in forum Build-It Yourself
    Replies: 8
    Last Post: 03-30-2010, 08:33 AM
  4. Laser Burning Question
    By shaley in forum Build-It Yourself
    Replies: 13
    Last Post: 05-27-2007, 07:13 PM
  5. Is this laser what I need
    By Bigbear in forum Projects
    Replies: 12
    Last Post: 05-21-2005, 04:18 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.