Am 02.04.2014 14:11, schrieb andy pugh: > On 2 April 2014 12:54, Peter Blodow <p.blo...@dreki.de> wrote: > >> No problem with that, because reversing the drive is done with one >> lever, no cranking, no re-engaging, no dial or indicator necessary. All >> thread cutting is done this way over here in the shops, I've never seen >> any other. > I would imagine that it makes it hard to thread up to a shoulder, > especially with a lathe with no spindle brake. > (and older lathes with screw-on chucks can often not afford to have a brake) It can be challenging, good nerves necessary - I use a 5 Hz setting with the VFD to slow things down in such rare instances.
> > Threading dials typically work better on Imperial lathes. With a > metric lathe you need to keep changing the thread counter gear. I don't even know what threading dials are and where they are installed, sorry. I usually cut a thread up to a given length, then stop and retract the tool in one instance. It's a two hand job. I can put the drive directly in reverse for a fraction of a second instead of a brake. Don't like it, though. Peter ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
