Instructions

WEAR YOUR
FORESIGHT IS BETTER
THAN NO SIGHT
READ INSTRUCTIONS
BEFORE OPERATING
SAFETY GLASSES
SHERLINE PRODUCTS INC. • 3235 Executive Ridge • Vista • California 92081-8527 • FAX: [phone]
Toll Free Order Line: [phone] • International/Local/Tech. Assistance: [phone] • Internet: www.sherline.com
5/14/19
Slitting Saw Holder P/N 3065
Fly Cutter and
Slitting Saw Holder
P/N 3052, 3052S, and 3065
Both the y cutter (P/N 3052) and the slitting saw holder
(P/N 3065) are held in the spindle with a drawbolt that
pulls these holders up into the Morse #1 taper. This is a
“sticking” taper and it has to be removed from the spindle
by backing out the drawbolt a few turns (do not disengage)
and giving the bolt a few light taps with a hammer.
A y cutter is a great way to machine at surfaces. It can
be easily sharpened and is probably the most economical
way to remove material on a mill. The cutter is basically
a left-handed lathe tool. We supply it with a carbide tip
cutter, but there is no reason a piece of 1/4" square high
speed steel wouldn’t work.
As with all machining operations, it is imperative the
work is securely held to the work table. A y cutter on the
Sherline can cut a path 2" (50mm) wide by .010" (.25mm)
deep in aluminum without even trying. Fly cutters exert
lower machining stresses on the machine than you may
expect. This is because the cutter “peels” the material o
with very little crushing action. If possible the cutter should
swing a diameter larger than the part width. The cutter will
usually take a second cut with the back side of the cutter
even when the spindle is perfectly square with the table.
Chips thrown o by the y cutter are HOT. Long sleeve
shirts are advisable and eye protection is a must!
If you’re machining aluminum, run the spindle at 1/2 speed,
with steel use 1/4 speed, and use a feed rate that creates
curly chips about .002" (.05mm) thick. You really should
have some understanding of cutting speeds if you use high
speed steel cutters on steels. It is very easy to exceed the
cutting speed of high speed steel with a large cutter diameter.
An example would be a H.S. cutter swinging a 2" (50mm)
circle shouldn’t exceed 200 RPM when cutting steel with
a cutting speed of 100 surface Ft/Min.
4 x CUTTING SPEED (Ft./Min.)
CUTTER DIAMETER (In.)
4 x 100
2
= 200 RPM
NOTE: The factor of 4 used in this equation has been
rounded o to allow mental calculations, the actual number
should be 3.8
In metric calculations, a close approximation is:
300 x CUTTING SPEED (M/Min.)
CUTTER DIAMETER (MM)
NOTE: The factor of 300 has been rounded o to simplify
calculations, the actual number is 318.
P/N 3052S Fly Cutter with Straight Shaft
The 3052S Fly Cutting tool was designed for those who
are using an ER-16 or 3C headstock. Our standard y
cutter holder (P/N 3052) has a #1 Morse tapered shaft and
is held in the 3/4 x 16 headstock spindle with a drawbolt.
The 3052S holder has a 3/8" straight shaft and is held in
the spindle using a 3/8" collet.*
*NOTE: Sherline Products does not sell 3/8" collets used
with the ER-16 or 3C headstock spindles. Those are available
through Hardinge Inc. or other tool supply sources.
Slitting Saws
The reason cutting speed is addressed in these instructions
is that it is such an essential part of using slitting saws
correctly. You must realize that when you exceed the cutting
speed with high-speed steels, the dulling process can be
instantaneous. It isn’t that you get shorter tool life, you get
“no life!” This can be expensive in time and money because
slitting saws usually cost so much you don’t have spares.
Another problem that happens with slitting saws is that
one edge gets dull before the other. This causes the blade
to deect as it cuts. How much it deects is somewhat a
function of the blade’s thickness.
A common error that can be made is putting a slitting saw on
the spindle upside down when they will only cut one way.
Coolant should be used. It doesn’t have to be ooded, but
it should be applied liberally to keep the ne teeth from
loading up.
When cutting a slot that goes into a large hole, it is possible
to have the part clamp the saw blade as it cuts through. It
usually doesn’t cause any serious problems, just stop the
spindle and back it out.
There is always a question of the best approach to use
when cutting a slot with a blade that is less than .060"
(1.5mm). You can cut in a series of passes, cut full depth
Fly Cutter P/N 3052
(#1M Taper Shaft)
P/N 3052S
(3/8" Straight Shaft)