Sherline 5000 Mill Assembly Instructions

-22-
Remember that heavy cuts and rapid feed will cause greater
strain on the chuck and lathe. This may induce “spring” or
binding of work and tools that can produce a poor finish.
NOTE: Because of the importance of a sharp and properly
ground tool to the cutting process, Sherline has prepared a
special instruction sheet on Grinding Your Own Lathe
Tools. There are a few tips that can make the process a
simple one. The instructions are included with each lathe
and with cutting tool sets when you order them from us, or
you may call us and request a copy. (Cost is $5.00 postage
paid.) They are also available from our Worldwide Web
site at no cost. Unfortunately, space does not permit us to
reprint them as part of this booklet.
Cutting tools are ground to various shapes according to
their usage. Tools are usually ground to shape as needed
by the operator. Some standard tools are described below:
Normal Turning Tool—or RIGHT-hand tool feeds from right
to left, is used to reduce work to the desired diameter and
is the most frequently used of all tools.
Side Tools—These are used to face off the ends of shoulders
and may also be used as normal turning tools. Note that a
tool that is fed from left to right and has its cutting edge on
the right is called a LEFT-hand side tool because the chip
comes off to the left. Cutting tools are named based on
which direction the chip comes off, not which side has the
cutting face.
Parting Tool—The conventional parting tool or cutoff tool is
shaped like a dovetail when viewed from above and is used
to cut off work pieces by feeding the end of the tool across
the lathe bed and through the work piece. The Sherline
parting tool instead uses a thin .040" (1 mm) blade that has
a slightly thicker ridge at the top to accomplish the same
job of providing clearance for the tool while cutting. Parting
tools thicker than .040" (1 mm) will be too thick for use on
your Sherline lathe.
Form Tool—A custom contour can be ground into a tool to
produce a special shape like a radius in a part. The width
of the cutting edge must be less than 2-1/2 times the smallest
diameter. Cutting speed must be slow to prevent chatter.
FIGURE 35—Form tool and part
The clearances ground behind the
cutting edges indicate the type of
material for which the tool may be used
and the direction in which it is fed along
the work. When grinding tool bits,
correct clearances are essential or
“rubbing” can occur.
The shape shown here would be
difficult to grind on a home bench grinder; however, the
same form could be achieved by grinding two separate
tools with half the needed arc on the outside corner of
each tool–a “left” and a “right.” By using a number of
simple shaped tools in sequence, complicated forms can be
generated.
Turning Tools (left and right hand)—Reference to Figure 36
will illustrate the lateral positioning of this tool. Note the
clearance behind the point between the end of the tool and
the work. Insufficient clearance will cause the tool to “rub,”
and excessive clearance will produce a ridged or wavy
TOOL
PART
FIGURE 34—A lathe boring tool in use
Boring Tool—A boring tool is used in the tool post on a lathe
or in an offsettable boring head on a mill to enlarge holes in
a work piece. (See Figures 35 [lathe] and 52 [mill].)
SIDE TOOLS
FIGURE 36—Arrows show direction of tool feed in all
diagrams.
NORMAL TOOL
SLIGHTLY
ROUNDED
CORNER
LEFT-HAND
TOOL
RIGHT-HAND
TOOL
CLEARANCE
CLEARANCE
NORMAL TURNING TOOLS (SIDE TOOLS)*
BORING TOOL*
THREADING TOOL**
INSIDE
THREADING TOOL
(P/N 1200)
PARTING TOOL***
*These shapes are available in high speed steel tool set, P/N 3007.
**The 60° threading tool is included as part of the carbide tool set, P/N
3006 and also comes with the thread cutting attachment (P/N 3100.)
***The parting tool comes with the cutoff tool holder, P/N 3002. Other
shapes are custom ground to accomplish special purposes as needed.
FIGURE 33—Cutting tool shapes
LEFT-HAND
RIGHT-HAND