On Mon, 5 May 2014 04:48:55 -0400, you wrote: >I suggested that a heavy steel bar, a 1x6 wide, nominally 24" long, to help >stiffen it up, and was told its a never mind. By someone on this list >about 2 coons ages ago. Whether I could find another at the scrap/recycle >yard about 50 miles away, I haven't looked. As for added stiffness, I >don't think a 1/4" plate would do anything but change the resonant >frequency, probably down in pitch because its more mass than stiff at that >thickness. (IMO)
Steel plate stops the feet sinking in the wood/mdf and allows shimming without it just sinking in. >But its certainly better advice now, having lived with it, sitting on that >mdf in 2 locations now and never getting a straight turn out of it. MDF and just two bolts - no wonder it turns tapered :) Needs to be bolted down to something rigid enough to enable you to pull the twist out of the bed. It will have one - no doubt. The casting weren't weathered before machining, It will have been clamped down to some dubious surface, machined then ground, both releasing stresses and when unclamped it twists and bends. My lathe came with it's own stand, it had a nice heavy cast top but it was far too big for the available space, so I made my own. My stand is 3" box section welded up, 10mm steel top with drip tray sandwiched between lathe feet and top. I put a shelf in there and it has steel panels bolted to sides and back. One of the best buys I made was a boxed Starrett Model 98 level, only paid £50 for it and some other tools from a Snooker table repairers/installers that shut down :) Multiple graduations are 5 thou per foot and you can get damned close with a good level alone. My method is use the level to get it even at headstock and tailstock ends, then use taper turning test to get it spot on. My lathe/stand isn't level, it tilts forward and towards the tailstock, otherwise coolant doesn't drain - but it has no twist so turns true. Steve Blackmore -- ------------------------------------------------------------------------------ Is your legacy SCM system holding you back? Join Perforce May 7 to find out: • 3 signs your SCM is hindering your productivity • Requirements for releasing software faster • Expert tips and advice for migrating your SCM now http://p.sf.net/sfu/perforce _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
