Yahoo! I have a thread! http://i.imgur.com/lcwDM.jpg
Thanks John and Andy for the pointers. This was a 1/4-20 in some random steel from a box of screw machine ends (12L14 maybe?) so maybe close to my hardest case as that's the biggest thread in the hardest material I use regularly for screws. Most of the time I work in brass or 6061. The lathe is a 7x mini so it has the usual drive bits with a something-tooth gear on the back of the headstock. I suppose I could add a Hall sensor there but if this setup keeps working like this I don't see any reason to bother. Sent from my iPhone On Apr 15, 2011, at 7:26 PM, andy pugh <bodge...@gmail.com> wrote: > On 15 April 2011 23:19, Colin K <cwk....@gmail.com> wrote: >> On Apr 15, 2011, at 2:08 PM, andy pugh <bodge...@gmail.com> wrote: >>> >>> If you _only_ have index then you have to be very sure that the spindle >>> speed won't vary during a cut. >> >> Does EMC compensate for spindle speed at all in this case, or is the second >> encoder required for that? > > It will come up with a new guess of spindle speed next time it sees an > index, and the position-interpolated value will then increment at that > rate. > > What is the drive system on your headstock? If there are teeth on a > gear or pulley you can probably use them as a rudimentary encoder (if > you can spare a pin, preferably two) > > -- > atp > "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ Benefiting from Server Virtualization: Beyond Initial Workload Consolidation -- Increasing the use of server virtualization is a top priority.Virtualization can reduce costs, simplify management, and improve application availability and disaster protection. Learn more about boosting the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
