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Thread: Homebrew Powerfeed

  1. #1
    Join Date
    Apr 2002
    Location
    NC
    Posts
    212

    Post

    Evan,
    I had to recover some files on a disk where the admin pw got corrupted, and found a utility that boots to linux from the floppy to access the NTFS partition, plus some scripts to reset the passwords. While you don't need the password functions, it might get the machine booted so you can read the files. See this site for some choices:

    http://www.petri.co.il/forgot_admini...password.htm#3

  2. #2
    Join Date
    Aug 2003
    Location
    North America
    Posts
    429

    Post Homebrew Powerfeed

    I am working on a powerfeed for a Grizzly 1006. I have a 24VDC gearmotor, and a speed control. My current plan for power transmission is to turn some pulleys on the lathe to accept a round leather belt running from the motor to the screw on the table. Adding an idler pulley, with a tensioning handle to engage/disengage. Another option may be the addition of a 24VDC electric clutch. I figure that this will give me the ability to disengage, and still use the handwheel on the other end of the table, without having to turn the motor. Any other ideas/SNAFUS that I should be thinking about? Thanks!
    Arbo & Thor (The Junkyard Dog)

  3. #3
    Join Date
    May 2003
    Location
    Vancouver's Island
    Posts
    41,977

    Post

    The mag clutch trick works very well. I used it on the power crossfeed for my SB9 that I built last year.

    See here:

    http://bbs.homeshopmachinist.net//Fo...ML/004015.html
    Free software for calculating bolt circles and similar: Click Here

  4. #4
    Join Date
    Jan 2004
    Posts
    782

    Post

    I have a right angle gear motor on my mill/drill. I used one of those shaft couplings that has the rubber spider in the center. I slid the metal part over the key in the motor shaft when I want to engage it. No belts, no slip. It works fine.

  5. #5
    Join Date
    Jan 2003
    Location
    On the Oil Coast,USA
    Posts
    19,330

    Post

    If you do it go all the way and wire it up with a rapid traverse button.

    Also I remember seeing some 24vdc clutches that have a cogbelt pulley attached,I think it was in either Herbach and Rademen or C&H sales,cheap too,like $9.95.
    I just need one more tool,just one!

  6. #6
    Join Date
    Jan 2003
    Location
    On the Oil Coast,USA
    Posts
    19,330

    Post

    Maybe look at-
    http://www.surpluscenter.com/item.as...-1828&catname=

    [This message has been edited by wierdscience (edited 04-15-2004).]
    I just need one more tool,just one!

  7. #7
    Join Date
    May 2003
    Location
    Vancouver's Island
    Posts
    41,977

    Post

    topic rescue.
    Free software for calculating bolt circles and similar: Click Here

  8. #8
    Join Date
    Dec 2002
    Posts
    5,724

    Post

    I got the PWM (motor speed) problem figured out cheap like.

    With a joystick and my software I can modulate the PWM to vary the speed on a pin on the output on the parallel port. With dual pairs of transistors (H-bridge) you can go both directions. Simple now since I got the timing right.

    I am playing with a few small dc motors as we speak. SImple, less than $200 total. That includes the motors. Most everyone has a old pc or two laying around..

    NO positional feedback, no encoders, strictly manual with feedback by eyeball. Later perhaps I can close the loop.

    David

  9. #9
    Join Date
    May 2003
    Location
    Vancouver's Island
    Posts
    41,977

    Post

    Lunkenheimer,

    I have that utility but it doesn't always work.

    David, I used Knoppix today to rescue data from two different systems. One was XP with NTFS, completely gibbled, would not even boot. Got all the required data and burned it to 4 CDs. Guy happily paid me.

    Other system was a Win ME system with major parts of the file system gone. Saved 1.6 GB of family pictures. Another happy customer.

    Knoppix earned me $250 dollars today.

    [This message has been edited by Evan (edited 04-18-2004).]
    Free software for calculating bolt circles and similar: Click Here

  10. #10
    Join Date
    May 2003
    Location
    Vancouver's Island
    Posts
    41,977

    Post

    David,

    I have to insist to my customers that they take their old PCs with them. I have way more than a few lying about. It's a real disposal problem. BTW, started playing with Knoppix today, very kool. I haven't played with linux for several years. I think Billy has something to worry about. I got it running because a customer brought me his PC, dead, won't boot, says there is no file system (XP, used to be, NTFS). Gonna try Knoppix to try and recover his 300 hours of work on his new songs (artiste), NO BACKUP. Think penguin.
    Free software for calculating bolt circles and similar: Click Here

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