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Wood to Metal Bandsaw conversion

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  • Wood to Metal Bandsaw conversion

    I purchased a simple three speed, 14" wood cutting bandsaw from Harbor Freight for under $300. A few years back I bought a half dozen DC Tread Mill motors off the internet for $29 each. I really wanted a metal cutting bandsaw for aluminum and mild steel. This conversion with high quality metal cutting blades will easily cut steel plate to 3/16 dry and larger if I use my "mist" cooler. It ripps through 1/2 Aluminum with a skip tooth blade like a hot knife through butter!

    Full write-up here............

    http://public.fotki.com/Rbertalotto/...w-wood-to-met/






    RoyB
    Dartmouth, MA

    http://www.rvbprecision.com

    Millermatic 185 MIG
    Miller Diversion 165
    Purox W200 O/A
    Grizzly 9957 Mill
    Grizzly 4030 Metal Band Saw
    Grizzly 1050 Knife Belt Sander
    Jet 1236 Metal Lathe
    TP Blast Cabinet

  • #2
    Originally posted by rbertalotto View Post
    I purchased a simple three speed, 14" wood cutting bandsaw from Harbor Freight for under $300. A few years back I bought a half dozen DC Tread Mill motors off the internet for $29 each. I really wanted a metal cutting bandsaw for aluminum and mild steel. This conversion with high quality metal cutting blades will easily cut steel plate to 3/16 dry and larger if I use my "mist" cooler. It ripps through 1/2 Aluminum with a skip tooth blade like a hot knife through butter!
    That's very nice. I have a 1972 14" Rockwell Delta Bandsaw that I use for wood. I have a 1750 rpm 1/2 hp Baldor motor in it so it's too fast for metal in general. That saw has been running constantly since I bought it with only a new set of rubber treads and one motor bearing. I have the 6" riser kit so I can run 105-1/2" blades. I use the same size blades on my 7X 12" Enco horizontal bandsaw with a different tooth cut, of course,

    I was wonder what the hp rating is on the treadmill motors? I would like to do the same modification on my saw for cutting aluminum stock.
    Miller Syncrowave 200
    Milermatic 252
    Lincoln AC/DC "Tombstone"

    Comment


    • #3
      These motors are 1/2HP. But DC horse power with a speed control governor is much different than an AC motor. I can stop a 1/2HP 1750 RPM motor with a gloved hand on a 3" diameter pulley. I can NOT stop one of these motors with the same pulley.......

      Ive replaced 2HP motors on milling machines with these 1/2HP motors and noticed no difference in power.
      RoyB
      Dartmouth, MA

      http://www.rvbprecision.com

      Millermatic 185 MIG
      Miller Diversion 165
      Purox W200 O/A
      Grizzly 9957 Mill
      Grizzly 4030 Metal Band Saw
      Grizzly 1050 Knife Belt Sander
      Jet 1236 Metal Lathe
      TP Blast Cabinet

      Comment


      • #4
        Thanks! I'll be on the lookout on eBay unless you beat me to it. LOL.
        Miller Syncrowave 200
        Milermatic 252
        Lincoln AC/DC "Tombstone"

        Comment


        • #5
          Talk about timing. Was on the market for a metal bandsaw.
          Dynasty 200 DX
          Lincoln 140
          O/A
          Gradatim vincimus
          "We conquer by degrees."

          Comment


          • #6
            You could always build one.
            Tim Beeker,
            T-N-J Industries
            (my side bussiness)

            Miller Synchrowave 350LX with tigrunner
            Esab 450i with wire feeder
            HH135 mig
            Thermal Dynamics cutmaster 51 plasma cutter
            Miller aircrafter 330 - sold
            Marathon 315mm coldsaw
            vertical and horizontal band saws
            table saw
            Dewalt cut off saw
            Sand blast cabinet
            lots of hand grinders
            Harris torch
            beer fridge

            Comment


            • #7
              Originally posted by tnjind View Post
              You could always build one.
              Thats what Im a gonna do.
              Ok. Stupid electrical Question. I assume you need a transformer to make the swap work. What to look for when buying the transformer? Can rewire my motorcycles & cars but take away the wheels & im lost.
              Dynasty 200 DX
              Lincoln 140
              O/A
              Gradatim vincimus
              "We conquer by degrees."

              Comment


              • #8
                Nice setup you made and good idea. Does the bottom wheel have a chip sweep to clear the metal shavings from the tire? I cut Al with my 16" made for wood band saw and the shavings are a problem with the rubber tire on the bottom wheel on mine. I tried to make a chip catcher but could not catch them all. I ended up adding a small stiff finger nail brush on a little bracket to scrub the crud off the wheel as it spins.


                Are you sure thats a DC motor? I used to work in the fitness equpment repair trade and that looks just like a 120V AC motor. DC motors are most often built with fixed magnets and that one looks like it has a winding. A 2 HP DC motor will have 2 or 4 good sized magnets and they tend to be long and thin to increase the magnet to rotor surface area. AC motors tend to be short and fat to increase the space for poles in the winding and stator. I could be complely wrong. AC or DC The controller on an AC treadmill motor will still produce rated HP accross the RPM range.
                Weekend wannab racer with some welders.

                Comment


                • #9
                  It's not a transformer that you need, it is a solid state AC to DC motor speed control unit. I just got the latest Surplus Center catalog and they have a few different DC motors and motor controls for sale.

                  Like these items:

                  http://www.surpluscenter.com/item.as...-2102&catname=

                  http://www.surpluscenter.com/item.as...-2352&catname=
                  RoyB
                  Dartmouth, MA

                  http://www.rvbprecision.com

                  Millermatic 185 MIG
                  Miller Diversion 165
                  Purox W200 O/A
                  Grizzly 9957 Mill
                  Grizzly 4030 Metal Band Saw
                  Grizzly 1050 Knife Belt Sander
                  Jet 1236 Metal Lathe
                  TP Blast Cabinet

                  Comment


                  • #10
                    DC Motor on Ebay

                    http://cgi.ebay.com/NEW-LEESON-90-VO...QQcmdZViewItem


                    Here's a motor somebody should jump on..........
                    RoyB
                    Dartmouth, MA

                    http://www.rvbprecision.com

                    Millermatic 185 MIG
                    Miller Diversion 165
                    Purox W200 O/A
                    Grizzly 9957 Mill
                    Grizzly 4030 Metal Band Saw
                    Grizzly 1050 Knife Belt Sander
                    Jet 1236 Metal Lathe
                    TP Blast Cabinet

                    Comment


                    • #11
                      Even better deal...............But ya need to hurry up!

                      http://cgi.ebay.com/Variable-speed-D...QQcmdZViewItem
                      RoyB
                      Dartmouth, MA

                      http://www.rvbprecision.com

                      Millermatic 185 MIG
                      Miller Diversion 165
                      Purox W200 O/A
                      Grizzly 9957 Mill
                      Grizzly 4030 Metal Band Saw
                      Grizzly 1050 Knife Belt Sander
                      Jet 1236 Metal Lathe
                      TP Blast Cabinet

                      Comment


                      • #12
                        I started a wood to metal bandsaw conversion. I concluded that to get the blade speed down to what's needed for steel, the best way was to add a gear reducer. I think the right ratio for a 14" wheel and 3500 RPM motor was about 20-to-1 but I could be off. You should figure out what blade speed you want. reducers can be had pretty cheap on Ebay (like $20 to $40). I was in the middle of building this up when I got a deal on a metal saw, so I ended up selling the half-done project on Craigslist. It's also pretty easy to throw on a 3 phase motor (also cheap on Ebay) and a VFD for variable speed. You might think you could do the whole thing with just the VFD, but you'll get too much torque reduction at the bottom end of the speed range without some mechanical advantage from gears or pulleys.

                        Comment

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