On 16.09.17 16:37, John Bald wrote: > Have a few options for used stands and cart that I might be able to modify > that could work for the mill, but haven't found anything that could be made > to work for the lathe. Used to buy used steel from local scrap yards for > projects a lot, but they won't sell it any more because of liability > concerns.
Cross-grain wood movement with changing humidity has always been a concern of mine w.r.t. a lathe base. My Taiwanese "Toolroom quality" 3/4 tonne lathe had massive bed twist (something like 0.4mm/200mm IIRC) when first plonked on the concrete floor. Very fine adjustments of the jacking screws included in the twin pedestal base, with a machine level on the cross-slide, fixed that. But the ease with which 0.1mm/m of twist can be inflicted, admittedly using the pedestals as levers, makes me shy away from wood as a base. OK, wood generally doesn't move much lengthwise, so wooden legs wouldn't be a big worry, but I'd run them through any connecting planking, so loads are only on end-grain to the floor. Then I'd check regularly with the machine level, at least for the first four seasons, adjusting the jacking screws as necessary. Erik ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
