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User Guide

ManualsBrandsSherline Machining Tools ManualsRobots to Build & ExperimentSherline 4400 Tabletop 3.5" x 17" CNC Lathe Complete Package (metric)
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Backlash must be allowed for by feeding in one direction only. Example: You are turning
a bar to .600" diameter. The bar now measures .622" which requires a cut of .011" to
bring it to a finished diameter of .600". If the user inadvertently turns the handwheel
.012" instead of .011", he couldn't reverse the handwheel just .001" to correct the error.
The handwheel would have to be reversed for an amount greater than the backlash in the
feed screws before resetting the handwheel to its proper position.
Backlash on the "X" and "Y" axes of the mill may be reduced to a minimum by
adjustment on the anti-backlash nuts. These nuts are located on the handwheel ends of the
mill saddle. The nuts are secured by slotted pan head screws which hold a pointed
locking plate that interlocks with teeth on the nut.
To adjust backlash, simply loosen the pan head screw and slide the locking plate to one
side. Rotate the anti-backlash nut clockwise on the "X" axis and counterclockwise on the
"Y" axis until snug. Replace the locking plate and tighten the pan head screw. With the
anti-backlash nuts properly adjusted, the lead screws will turn smoothly and have no
more than the proper .003" to .005" of backlash.
FIGURE 12-Backlash Adjustment. NOTE: A new lock now uses a star gear rather than
the pointer to locate the anti-backlash nut, and a button head socket screw locks it in
place. This system is easier to use, but the function is essentially the same. (The hole
centers are different, which means the star gear cannot be used to replace the pointer on
older models.)
Handwheel adjustment
The handwheels are secured to their corresponding leadscrew shafts by a small set screw
in the side of the handwheel base. Check them periodically to make sure they have not
been loosened by vibration. On the "zero" adjustable handwheels, you must first release
the rotating collar by loosening the locking wheel. Then rotate the collar until you can see
the set screw through the small hole in the side of the collar and adjust the screw as
necessary.