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Extending the "Y" axis by modifying the ball nut mount.
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June 24, 2012 Joe Katona 1
Y-axis modification for Hi Torque Mini Mill
June 24, 2012 Joe Katona 2
Y-axis modification for Mini MillFor our mini-mill build, the y-axis travel is limited by 2 factors:1. The Z-axis down stop interferes with the y travel when the stop is in the down position on the Z-
column.2. WATCH OUT!!—when the Z-axis stop is out of the way, or removed, the “Y” travel toward the column
will go far enough to let the ball nut lose its ball bearings.
3. This modification prevents the ball nut issue, allows you to remove the Z-axis down stop (it just gets in the way for CNC anyway), and gets you another 0.75” of Y-axis travel!!
Before After
Disable all of these switches except the Estop
switch
You will add 0.75 inches of Y-axis travel—and the ball
nut will not lose its bearings.
Z-axis downstop limits Y-axis travel
June 24, 2012 Joe Katona 3
Y axis modification for Mini MillThere are 2 component modifications and 1 build modification involved :
Component Modifications:1. The Y Table clearance slot needs to be widened approx .22”2. The Ball nut retainer (the aluminum part that the ball nut screws into) needs to be notched .22” x 1”
deep
Build Modification:
1. The ball nut needs to be screwed into the opposite side of the ball nut retainer
June 24, 2012 Joe Katona 4
Y axis modification for Mini MillThere are 2 component modifications and 1 build modification involved :
Component Modifications:1. The Y Table clearance slot needs to be widened approx .22
This is the stepper motor end of the
Y-axis table
.22” Machined
from this slot
June 24, 2012 Joe Katona 5
Y axis modification for Mini MillThere are 2 component modifications and 1 build modification involved :
Component Modifications:2. The Ball nut retainer (the aluminum part that the ball nut screws into) needs to
be notched .22” x 1” deep
Mill notch .22 x 1” in ball nut retainer
June 24, 2012 Joe Katona 6
Y axis modification for Mini MillThere are 2 component modifications and 1 build modification involved :
Build Modification:
1. The ball nut needs to be screwed into the opposite side of the ball nut retainer
Ball nut is mounted on
opposite side of retainer
Notch faces opposite direction
from ball nut
June 24, 2012 Joe Katona 7
Y axis modification for Mini MillThere are 2 component modifications and 1 build modification involved :
Build Modification:
1. The ball nut needs to be screwed into the opposite side of the ball nut retainer
This shows the ball nut at full stop
in Y- direction
Notice the effect of the notch that has been milled into the ball nut retainer. The set screw that holds this piece has enough length to do its work.
June 24, 2012 Joe Katona 8
Conclusion:
I know this modification will not be for everyone, but the additional .75” of travel, not to mention the elimination of the possibility of the ball nut bearings falling out, makes it worth the time (took me about 1 hour).
Y- travel increases by 0.75” to 5.65”