Hi I have put a clock on my triac table and i can move the handwheel 0.05mm before the table moves, also i can push and pull the table by the same amount. I guess that this is some backlash and can be solved by adjusting gib strips and tightening tab nut.
I have taken the cover off the lefthand end of the table to reveal the motor, the motor is attached to a part by 4 bolts and this part in turn is attached to the table by bolts.
My question is where do I go from here to get to the tab nut?
CNC Apprentice
i have the same issue, unfortunately the denford forum doesnt seem keen to help people with backlash issues. i have taken my table off the machine entirely to find that my ballscrew nuts are very worn which would explain the nearly 0.07mm backlash i was experiencing. will have to get new ones/get them refurbished.
CNC Guru
first off download the triac assembly diagrams and you can see what is behind the x axis pulley.
Remove the motor with the plate still attached and then the ballscrew pulley. (there are two grub screws holding it on)
Behind the pulley is the bearing assembly which is held in by a tab nut.
Fold the tabs down on the tab washer or it will strip the inner tab and will be useless.
Carefully tighten the nut until the play is gone, then tighten a small amount more to preload the bearings.
Reset the tab washer to lock the nut.
If the play is not completely removed check again.
Remove the motor with the plate still attached and then the ballscrew pulley. (there are two grub screws holding it on)
Behind the pulley is the bearing assembly which is held in by a tab nut.
Fold the tabs down on the tab washer or it will strip the inner tab and will be useless.
Carefully tighten the nut until the play is gone, then tighten a small amount more to preload the bearings.
Reset the tab washer to lock the nut.
If the play is not completely removed check again.
CNC Apprentice
Thanks Angel-tech, but i had already got the drawing and got rid of the backlash.
Now I need to replace my spindle bearings and they feel rough when i turn the spindle and very noisy when running, do I need any special tool to remove the bearings from the casting and from the spindle? Bearing puller?
Now I need to replace my spindle bearings and they feel rough when i turn the spindle and very noisy when running, do I need any special tool to remove the bearings from the casting and from the spindle? Bearing puller?