The Flycutter is held in the spindle with a drawbolt that pulls it 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 Flycutter is a great way to machine flat 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 flycutter on the SHERLINE can cut a path 2" (50mm) wide by .010" (.25mm) deep in aluminum without even trying. Flycutters exert lower machining stresses on the machine than you may expect. This is because the cutter "peels" the material off 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.
CAUTION!
Chips thrown off by the flycutter 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.)
Or
(4 x 100) ÷ 2 = 200 RPM
Note: The factor 4 used in this equation has been rounded off to allow mental calculations, the actual number should be 3.8
In metric a close approximation is:
300 x CUTTING SPEED (M/Min.) ÷ CUTTER DIAMETER (mm)
Note: The factor 300 has been rounded off to simplify calculations, the actual number is 318.
Joe Martin, President and Owner
SHERLINE Products
|
NO. REQ. |
PART NO. |
DESCRIPTION |
|
1 |
1193 |
Carbide Tool, Left |
|
1 |
4005 |
Handwheel, Inch (P/N 4105 Metric) |
|
1 |
3049 |
Flycutter Body) |
|
1 |
3088 |
1/4-20 x 5-1/8" Drawbolt |
|
2 |
3108 |
10-32 x 3/8" Set Screw |
ACCESSORIES AVAILABLE
|
PART NO. |
DESCRIPTION |
PRICE |
|
1196 |
High Speed Steel Tool, Left |
$5.00 |
|
3005 |
High Speed Steel Tool, Blank |
$3.00 |
|
3005B |
5 High Speed Steel Tools, Blank |
$10.00 |
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