Re: [Emc-users] Oversized balls

2013-02-19 Thread Steve Blackmore
On Sun, 17 Feb 2013 20:23:40 -0600, you wrote: >If the rebuilder uses two different sizes then the smaller ones >alternate with the larger, that way the smaller counter rotate to keep >down friction. The load capacity decreases. Any other ratio defeats the >purpose. Your right - I asked today

Re: [Emc-users] Oversized balls

2013-02-18 Thread Chuck
; Enhanced Machine Controller (EMC) Sent: Sunday, February 17, 2013 6:23 PM Subject: Re: [Emc-users] Oversized balls Steve Blackmore wrote: > On Sat, 16 Feb 2013 13:34:52 +, you wrote: > >  >> Has anyone tried reducing the backlash in a ballnut by fitting oversized >> bal

Re: [Emc-users] Oversized balls

2013-02-17 Thread ed
Steve Blackmore wrote: > On Sat, 16 Feb 2013 13:34:52 +, you wrote: > > >> Has anyone tried reducing the backlash in a ballnut by fitting oversized >> balls? >> If so, how did it turn out? >> > > Andy - commercially they don't replace every ball with oversize ones. > Some do, some d

Re: [Emc-users] Oversized balls

2013-02-17 Thread Steve Blackmore
On Sat, 16 Feb 2013 13:34:52 +, you wrote: >Has anyone tried reducing the backlash in a ballnut by fitting oversized balls? >If so, how did it turn out? Andy - commercially they don't replace every ball with oversize ones. They replace every "n" th ball with a slightly oversize one. It's a bi

Re: [Emc-users] Oversized balls

2013-02-17 Thread Andy Pugh
On 17 Feb 2013, at 00:47, ed wrote: > Is this a single nut? Some are doubles with shims between to set lash, > they of course cost more. Yes, single nut. Some sort of double nut would have been nice, but it would cost me too much travel on that axis.

Re: [Emc-users] Oversized balls

2013-02-16 Thread ed
Andy Pugh wrote: > On 16 Feb 2013, at 14:58, ed wrote: > > >> Do you have backlash the full length or is the screw worn in the middle? >> Most can be reballed to reduce the slop but you must be careful that the >> OD of the ball does not bear, you want contact on the quadrants. How >> much

Re: [Emc-users] Oversized balls

2013-02-16 Thread Andy Pugh
On 16 Feb 2013, at 14:58, ed wrote: > Do you have backlash the full length or is the screw worn in the middle? > Most can be reballed to reduce the slop but you must be careful that the > OD of the ball does not bear, you want contact on the quadrants. How > much backlash do you have now?

Re: [Emc-users] Oversized balls

2013-02-16 Thread ed
andy pugh wrote: > Has anyone tried reducing the backlash in a ballnut by fitting oversized > balls? > If so, how did it turn out? > > Do you have backlash the full length or is the screw worn in the middle? Most can be reballed to reduce the slop but you must be careful that the OD of the ba