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Rotating welding device

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  • gearhead
    started a topic Rotating welding device

    Rotating welding device

    Anyone have plains or has constructed a rotating welding table for welding round tubing. I have seen the fixtures advertised but they are very expensive. I have electric motors but getting the speed to gear down in my problem.

  • Bodybagger
    replied
    Originally posted by gearhead View Post
    Why couldn't I just use an electrical reastat (sp) switch on the motor to change the speed.
    Assuming you are talking about an AC motor...

    You can't use a rheostat or autotransformer to slow the motor down because you are only changing the voltage. The frequency determines idle speed and the voltage applied to the motor affects only the torque when operating against the load. If you decrease input voltage enough to slow the motor down, you'll burn it up.

    Now a DC motor is a whole 'nother animal.

    Leave a comment:


  • MD Welding
    replied
    I forgot to mention I have a speed controller hooked up also.

    Leave a comment:


  • MD Welding
    replied
    I made this one for me and it works good. It's a dc motor with a 300 to 1 gear box. The max rpm is 6 and it's a little fast for big diameters. The motor and gear box are ebay stuff.

    As you can see I use it for other things. I had to roll 1/4 x 1 hast x. I did 1 by hand and figured there was a better way. There was!

    I had to build something bigger than my little Atlas before I killed it.
    Attached Files

    Leave a comment:


  • Burnt hands
    replied
    welding turntable

    Hello gearhead,

    Here are some photos of a turntable I made. It uses a gear reducer I had sitting for 20 some years. Ratio is 1725 to 1 so I had to do some experimenting.

    I first put a 3" diameter pipe coupling on an old record player and had a friend turn it slowly at rough tig welding speed while I timed it with a stopwatch.

    We came up with 1/2 to 3 RPM as a range for the turntable speed for my needs. Your needs (and mileage) may vary.

    Then I ran the numbers with my existing gear reducer and found a 12 volt DC motor on ebay.

    It works perfectly as far as speed range for the turntable as I can use 12 to 24 volts DC to run it.

    The nice thing is that by swapping the leads (it has only 2), the motor will also reverse rotation. This is a nice plus.

    I got the motor couplings from Reid Tool (www.reidtool.com) and the 3 jaw chuck from ebay.

    I found the motor speed control in the internet and SSC controls (www.ssccontrols.com) has a foot switch and resistor which works for my set-up very similar to a tig foot control. SSC Controls will
    change the resistor value to match your needs. They also make TIG foot controls.

    Welded a plate to the motor coupling in case I had odd shaped pieces to weld.

    Most welding is done with the 3 jaw chuck.

    Hard part is using both feet and not mixing up who does what.

    Hope the photos help.
    Attached Files

    Leave a comment:


  • racinjason75
    replied
    i cant get your link for the pic to work. did i read in hear not to long ago about using a tred mill motor/

    Jason

    Leave a comment:


  • wldrman
    replied
    Why couldn't I just use an electrical reastat (sp) switch on the motor to change the speed.


    You can if your motor is wired for it. I don't know how to tell, but someone here probably does.

    Leave a comment:


  • gearhead
    replied
    Why couldn't I just use an electrical reastat (sp) switch on the motor to change the speed.

    Leave a comment:


  • wldrman
    replied
    You'll probably want to consider a variable speed motor so you can match your welding speed. Most of these units have a foot pedal or dial for this.

    Leave a comment:


  • aametalmaster
    replied
    Here is my gearbox setup for bending metal, the gearbox fits many machines i have i just remove 3 bolts and the whole unit removes to bolt on another machine. The pic with the top removed is what you want. Add another top, and a shaft with a plwyood top and you are ready to go. You can even cover the plywood with sheetmetal to keep it from burning. Also 60-1 is the slowest i found reasonable...Bob
    http://pg.photos.yahoo.com/ph/aameta.../ph//my_photos

    Leave a comment:


  • gearhead
    replied
    So 60 to 1 is the gear ratio I should be looking for. I'll do the searching. thanks

    Leave a comment:


  • aametalmaster
    replied
    Well gearhead you need a gearbox to slow it down. Check ebay and do a google search they are cheap on the web. I got a NIB 60 to 1 for 100 bucks its 600 local. I have a home made positioner that i use the base for a few other items i just switch the tops. It works great...Bob

    Leave a comment:

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