Novakon Systems NM-200 Pro Series, Руководство оператора

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Chapter 7
TOOL HOLDING
OVERVIEW
In milling operations cutters are mounted in a tool holder which is drawn into the spindle by a
drawbar system. The NM-200 utilizes the readily available Bridgeport R-8 standard tooling. The
standard drawbar for R-8 tapered tooling is 7/16 diameter with 20 threads per inch.
TOOL HOLDING OPTIONS
There are several tool holders that can be used in the spindle of the NM-200 Bed Mill.
Arbors come in different sizes and lengths with one end tapered to suit the inside spindle taper,
in the case of the NM-200, an R-8 taper is required. The term arbor is used for a general work
holding device. Arbors can mount drill chucks, slitting saws, gear cutters and shell end mills. An
arbor is secured in place with the drawbar system.
Collets (Spring Collets) are the most commonly used work holding device. They come in a
variety of styles and sizes. They are bored to hold a specific diameter. As the collet is drawn into
the spindle of the machine, the spring collet “closes” or “clamps” down on the tool securing it
in place.
End Mill Adapters are made specifically to hold end mills. Like arbors they come in different
sizes with one end tapered to fit the inside spindle taper. End mill adapters are bored to a
specific size to hold end mills with a corresponding shank size. End mills are secured in the
adapter by friction and a set screw clamps down on the flat end mill for extra security.
INSTALLING THE TOOLING
Once you have determined the appropriate tooling for your operation, you will need to secure
it in the mill spindle via the drawbar system. The drawbar is located inside the protective sheet
metal housing of the NM-200 bed mill.
Step 1 : Turn the knurled knob on the right side of the mill head door to access the drawbar.
Step 2
: The drawbar is secured in place by the drawbar nut, but has a slight movement up and
down in the spindle which allows you to easily install your tooling.