X and Y axis rod questions

[Mick Jagger]

Hi,

I have recently ran into trouble with my cnc machine, it wouldn’t move on the axis anymore so I had to open it and fix it, I took care of that problem but when putting it back together I saw a spring on the rod that it travels on for the axis. I was confused on what the purpose of that spring was and just wanted to know if anyone can help me understand it. I have taken two pictures to show the area I am talking about.

Thank you
http://img301.imageshack.us/img301/7476/spring1ln0.jpg
http://img339.imageshack.us/img339/5169/spring2mm0.jpg

[dwarf]

i think they are working there..

they should have beed put there for fastening the miniscule spaces between screw chucks... thats my idea

[RICHARD ZASTROW]

Anti-backlash device?

[ejholmgren]

Anti-backlash! The secondary leadnut is tightened towards the primary until the backlash disapears. The springs are just there to provide an opposing force as you tighten the bolts.

[SORCHEROR]

you need to turn the bolts till the make contact with the backlash nut,the springs keep tension so it doesnt loosen during operation,its an anti-backlash nut,you tighten the bolts until you have near zero backlash