On Thu, 7 Jun 2012 18:00:02 -0400, you wrote:
>So do I, by .1" or thereabouts. My backlash is not more than 1/5th of >that. IIRC z is about .00147" right now, phenomenally tight for a mini- >lathe being moved by its original screw, its support bearings and half nut. I've read the posts that follow, the one by John K is particularly interesting as that speed up/slow down behaviour is still there to some extent, I can hear it, so the fix doesn't quite work for me. For what reason I don't know. However, my get around is the 5mm cutting in air. It seems to have settled down by then on the thread pitches and spindle speed combinations I commonly use. Most of my threading is in the .5 to 2mm pitch range with spindle speeds of 500 to 1000 rpm. If I got some variation at the start of the thread I'd increase the distance or slow the spindle. I think your .1 air cut is far too small - try 1 inch and see what happens then reduce it to find a sweet spot. I do agree though that any backlash comp needs to be taken into account with threading and spindle index synchronization. Steve Blackmore -- ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
