On 04/23/2016 06:33 PM, andy pugh wrote: > On 24 April 2016 at 00:23, Jon Elson <el...@pico-systems.com> wrote: >> Sheldon made a range of machines. The only one that is a >> "toolroom precision" grade is the R-series. > Intersting, I can't find them at http://www.lathes.co.uk/sheldon/index.html > The Sheldon R-series was their high-end lathe, to compete with LeBlond and other toolroom lathes. The early R-series was fairly advanced, then they re-did it in about 1968. After that, they had an 80-speed QC gearbox, and added a feed shaft parallel to the threading leadscrew. Feeds are via clutches, so that an overload won't break gears.
The main gearbox is in the pedestal, so the only gears in the headstock are the backgear. The headstock casting is about the size of a smallblock V8, and similar weight. Even the tailstock is too heavy for me to pick up without separating the upper and lower half. The cross feed dial is about 4" diameter. There are a bunch of other construction details that show how hard they thought about every single bit of the lathe. See http://pico-systems.com/sheldon.html for the saga of getting the lathe moved inside, and some pics of it. Jon ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
