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
6/28/18
End Mill Holders for the Sherline Mill
Most of the work accomplished on the Sherline milling
machine can be accomplished with one of the miniature
series cutters. These cutters have standard shank diameters
of 3/16" (4.8 mm) or 1/4" (6.4 mm) and are normally held
using Sherline’s Milling Collets, P/N 3060. (See page 2.)
However, there may be times when you will want to use
a standard end mill with a 3/8" (9.5 mm) diameter shank.
These cutters are more readily available than the miniature
series of cutters and are actually less expensive in many
cases. Also, special purpose cutters such as those designed
for cutting key slots, dovetails and corner radii usually have
3/8" diameter shanks. The Sherline 3/8" end mill holder
will increase the versatility of your milling machine by
enabling you to hold these popular cutters. (CAUTION!
Always consider the power and size limitations of your
equipment when using larger size cutters. You may want
to reduce cutter speed.)
Flat
FIGURE1—The at area on a commercial double-ended end
mill is for the set screw on the end mill holder to tighten against.
In addition to the 3/8" holder, this same type of end mill
holder is now also available to hold 5/16" (P/N 3075),
1/4" (P/N 6079), 3/16" (P/N 6080), 1/8" (P/N 6081), 5/32"
(P/N 6082), 1/2" x 1.2" (P/N 6083), and 1/2" x 2" (P/N 6086)
end mills. The advantage of this type of holder is that it
allows you to use smaller size double ended mills or tools
with longer shanks which could not be held in a milling
collet. An end mill holder is a better choice compared to a
collet for holding end mills because:
1. An end mill can spin in a collet during heavy cuts while
the set screw against a at on the end mill prevents this
with an end mill holder.
2. The end mill is supported over a longer distance in an
end mill holder than in a collet. We actually decided
to produce this type of holder in the smaller sizes after
many requests from Sherline users who simply prefer
its ease of use even when using regular miniature
end mills.
The 6081 1/8" end mill holder uses two 4-40 set screws
that take a 5/64" hex key (included). All the larger end mill
holders take a single 10-32 set screw. It uses a 3/32" hex
key, which is not included but comes with each lathe and
mill, as it is the same hex key used to tighten the handwheel
set screws.
For those who use metric size cutting tools, the 10.0 mm
(P/N 3078) is the most common size, but we also oer
6.0 mm (P/N 3076) and 8.0 mm (P/N 3077) sizes.
One of our Sherline machinists also pointed out that these
holders make an excellent “quick-change” tool system for
milling. Keep your favorite cutters chucked up in their own
holders and simply swap holders to change tools. Since
they just screw onto the spindle thread, changeover is a
quick operation.
NOTE: The thread “pitch diameter” on both the end mill
holder and the headstock spindle are held to a tolerance that
is almost an interference t. We do this to keep the runout
as low as possible. Some of the end mill holders may t
tight when you rst use them. We highly recommend that
you wipe a drop of light oil onto the threads of the end mill
holder before you thread them onto the spindle.
Using an Edge Finder with an End Mill Holder
We design our end mill holders specically to hold end
mills. The bore on each end mill holder is .0002"-.0003"
over size to allow for a clearance t that will still maintain
the best possible run out.
The edge nder that you purchase may not t in our end
mill holder due to several reasons.
1. It is not ground to the correct size.
2. It is not ground round.
3. It has a sharp edge which is digging into the end mill
holder.
FIGURE 2—The arrow in the diagram above shows where the
sharp edge is on the edge nder that may need to be bued,
sanded, or led, so it doesn’t dig into the end mill holder.
End Mill Holders
P/N 3075, 3079, 6079, 6080, 6081, 6082, 6083, 6086 (Inch)
P/N 3076, 3077, 3078 (Metric)
Milling Collets
Collet Sets P/N 3060 (Inch)
P/N 3090 (Metric)