© 2020 Overbeck Machine Tools, LLC Version 2.3
6
diameter fasteners. The fasteners should only be tightened enough to slightly
compress the rubber pads. The
LT-2AR
should have no lateral movement. If you
are mounting to a flat machined surface, no rubber pads are needed. Simply
fasten the machine to the work surface using 3/8” diameter fasteners. Torque
them to 10 Ft-Lb maximum.
3.0
Operation
Have you read and understand Section 1, Safety and Safeguards? The machine may not
be operated without a full understanding of Section 1 and 2.
3.1
Collet Specification for all Models
The 5C collets used on all Twister models must conform to the drawings shown in
Figure 3
and
4
. The two most important features are the 1.2500” inch diameter and
width of the thread relief. If your collets have a thread relief wider than
.100” inch
you run the risk of the collet rotating and allowing the spindle key to get permanently
stuck in the thread relief. If this happens, your machine will require factory repair.
We strongly recommend using only collets from a known manufacturer that meet these
specifications. Oversize 5C collets up to three (3”) inches in diameter may be used in
the Twister Speed Lathe. The collets
MUST
have the 10 degree taper as shown in
figure 3
.
3.2
Adjusting Collet Tension
A) Make Sure the Main
POWER
Switch is in the
OFF
position.
B) Insert the 5C collet into the spindle and rotate the collet to align the collet keyway
to the spindle key.
COLLET AND SPINDLE BORE MUST BE CLEAN!
Slide the closer
handle (Fig. 5) to the Right
C) Release the adjusting finger (Fig. 5) by pressing down into the depression on the
collet closer.
D) With your Left hand rotate the knurled knob (Fig5) clockwise while pressing the
collet in, to engage the collet threads. Use your Right hand to prevent the collet
from getting pushed out of the spindle. Thread the closer onto the collet about 2
turns only.
E) Insert a workpiece into the collet and push the closer handle to the Left. Continue
rotating the knurled knob clockwise until it gets snug. Should the spindle begin to
rotate, push and hold the spindle lock (Fig. 5) It will lock the spindle and prevent
rotation.
F) Move the closer handle all the way to the Right and rotate the collet closer
clockwise two to four more notches on the sector plate (Fig. 5). Check to see if
the collet is gripping the workpiece with the desired firmness by moving the closer
handle to the Left.
G) Once you find that the collet is gripping the workpiece properly, lock the adjusting
finger by pushing down on the Right side of the finger. Make sue that the finger
engages a slot in the sector ring fully, if not, release the closer handle and slightly
rotate the knurled ring clockwise or anti-clockwise in order for the adjusting finger
to fall into one of the slots on the sector ring. Re-lock the adjusting finger in the
sector ring and lock/close the closer by moving the handle to the Left. Your work
should be held tight at this point.
H) The Twister Speed Lathe is now ready for processing your workpiece. It is not
necessary to adjust the collet again for that specific workpiece as long as the work
diameter does not vary. All you need to release the part or clamp the part is move
the closer handle to the Left to clamp and Right to release. Remember, only move
the closer lever when the spindle is not rotating.
3.3
Start and Stop the Spindle using the Brake-Run Switch
A) After the part is firmly locked in the collet, turn the Main
POWER
switch to
ON
, set
the
SPINDLE ROTATION
switch to
NORMAL
or
REVERSE
, and turn the
BRAKE-RUN
switch to
RUN
.
B) Select the desired speed by turning the
SPINDLE SPEED
knob.
C) In order to stop the spindle, move the
BRAKE-RUN
switch to the
BRAKE
position.
