[GrizHFMinimill] Re: anti backlash

I added an 80 lb force gas spring to replace the torsion spring on the z-axis, it keeps constant pressure on the rack in the same direction and now I can back up the Z fine feed after advancing it without worrying about backlash. It does require you to keep the gibs lock on when fine feed is disengaged or constant pressure on the course feed otherwise it will self return to the top, a side benefit I use often when drilling and tapping. The gas spring has a cushion at the top end so it comes to a nice deceleration and stop.

--- In GrizHFMinimill@yahoogroups.com, John Mattis <jsmattis@...> wrote:
>
> I just have a 1 inch travel dial indicator on the Z axis so I don't worry about backlash.
> John
>
>
>
> ________________________________
> From: Jeff Wild <wildja99@...>
> To: GrizHFMinimill@yahoogroups.com
> Sent: Wednesday, January 11, 2012 10:58 AM
> Subject: [GrizHFMinimill] anti backlash
>
>
>  
> hi group. sorry about no link.i will re write the mod.the castle joint on the fine/coarse handles ,has a lot of free play which is the main offender in the bachlash problem,i have made a small coller with allen screew in the rim which locks the castle joint when using the fine feed.it took me less than one hour to make on the lathe and has got rid of 90% of the backlash,try it you will not be disapointed jeff
>

------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/GrizHFMinimill/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/GrizHFMinimill/join
(Yahoo! ID required)

<*> To change settings via email:
GrizHFMinimill-digest@yahoogroups.com
GrizHFMinimill-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
GrizHFMinimill-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/