Welding Positioner.

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I am looking to make a welding positioner.  I have a variable speed DC motor with drive.  Has anyone made one?  I am looking for ideas and advise on design.  Most of the parts I will be welding with it will be under 5 pounds, steel, and axially symetrical.  I have an engine lathe and bridgeport so machining parts won't be a problem.Thanks,RonRon ShopFloorTalk Millermatic 350P, M-25, M-40 gunsDynasty 300DX, Coolmate 3, Crafter CS-310 TorchTrailblazer 302, 12RC, WC-2430A spoolgunSpectrum 2050Thermal Arc Plasma Welder PS-3000/WC-100B
Reply:Here is a cool home built unit- follow link to the Chaski board and click on 'attachment'.Click link belowGreg_S built"after a long day of doing nothing...its gooood to kick back" Pumbaa
Reply:Thanks buddy!!!Ron ShopFloorTalk Millermatic 350P, M-25, M-40 gunsDynasty 300DX, Coolmate 3, Crafter CS-310 TorchTrailblazer 302, 12RC, WC-2430A spoolgunSpectrum 2050Thermal Arc Plasma Welder PS-3000/WC-100B
Reply:Some PM's between Franz and me.I have some old tractor bearings I was going to use.  I was goint to turn a shaft to match.  I was planning on making the shaft with a #3 morse taper so I could put a small 3 jaw chuck in it.  My lathe has a #3 taper in its tail stock so I have the tooling (one is old and beat up so it would be relagated to welding not machining.)  The bearing are way larger than I need but they are free, lol.  They came out of my JD 70 when I rebuilt the transmission.  The were good but I already had the replacements and hell while it was apart I replaced everything.  (some bearing weren't in such good shape.  I was going to make it single axis to start with.  The gear motor mounts on the face so the outer housing for the bearing (and shaft) I was planning on milling two faces opposite and tapping a square four bolt pattern for later mounting to a second axis.  But I was thinking of walking before I ran.Thanks for the insight.Franz wrote on 05-17-2004 06:33 AM:Brushes, the BIGGER, the better.  The ones on a lathe for doing drive shafts have a face that is about 1/2" x 1" and there are 3 of them.Another thing from the sneaky & dirty trick department is to put 3 or 4 roller skate wheels from a conveyor around the perimiter of the rotating plate , prefferably near the brushholders, to minimize wobble.If you're doing really light stuff, you can get what are called Lazy Suzan bearings from a commercial hardware supplier that only add about 1/2" of height.  Lots of ways to do it, and mostly it depends on what you want to accomplish.BTW, if you can't find large carbon brushes, let me know, I think I have a ****load of them.Single axis rotating tables are easy, PLEASE, don't ask me how to build one that operates on 2 axes.Shade Tree Welder wrote on 05-16-2004 10:56 PM:I all ready have a DC Gear motor with a DC Drive all variable speed.  0- 12 RPM.  The copper ring is a good idea.  The brushes I am assuming you are refering to the type of brush used in old tractor generators (they are cheap and available.)Thanks for the help I will post when done.Franz wrote on 05-17-2004 03:20 AM:Shade Tree Welder wrote on 05-16-2004 07:18 PM:Any Ideas?http://www.weldingweb.com/vbb/showthread...&threadid=1303