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About Conical Tapered End Mills

   Charts, formulae, and general information on these pages should guide you to choose the correct cutters.
   Our standard cutters are designed for side milling, or interpolating around the inside of a cavity.  Our 17° and 28° right-hand spirals are relatively fast spirals for use as reamers on some materials.  If reaming a hole in tough materials, they may chatter and grab into the side wall.   In these instances, for reaming a blind hole, we prefer to make special cutters with a slow 12° right-hand spiral.  If you are reaming a large enough through-hole, a left-hand spiral would work good, because the chips travel downward;  whereas a right hand spiral will bring the chips out of the top.
   All cutting tools are breakable, but a judicious selection will minimize breakage.  The greater the length of the mill compared to its diameter, the more fragile it is.  Use a tool with as short a flute as possible.  Short end mills cut fast and free, lessening the hazard of breakage.  When long, slender mills must be used, a light cut is called for.
   Because of the varying diameters of Conical tapered end mills, spindle speed and feed rate cannot be accurately recommended.  Generally, you are right to run Conical tapered end mills at the highest possible speed that does not produce heat-discolored chips.  Feed the cutter slowly enough to let the cutter do the cutting.  Feeding too fast can cause broken tips and chipped flutes.   When you use coolant or air on the cutter, you can increase spindle and feed rates.
   All high speed steel Conical end mills are produced from premium grade,  high speed steels, heat treated to a high Rockwell, for shock and abrasion resistance.   Carbide material is premium micro-grain carbide.
   Taper angles remain constant to tolerances of +/-.001" per inch of flute, regardless of the cutter's diameter or length, even after resharpening.  Tip tolerances are held at +/- .002" (.001" for straight end mills).  Shank tolerances are -.0002" to .0005".  Constant helixes of right hand spirals range between 28° for smaller tools, 25° for larger and steeper tapers.  Constant helixes of left hand spirals range between 15° and 18°.
   Conical has always welcomed the chance to produce tools to your own specifications. We have over-runs on many specials produced for others.  Check with us early, we may have your answer in our stock room.

Toll Free Phone  ( 888-531-8500 ) or FAX ( 616-531-7742 )

Taper angle or draft angle per side


This is your first consideration.  All tools are graduated either by the half-degree or full degree.  Remember though that it is per side.

Tip size diameter

The tip or small end diameter is measured in "inch standard".   All tip sizes are listed in the first catagory on each tool table that you see when you click on the Tool Index button on the home page, and then select which degree of tool that you want.


Configuration of the tip


All cataloged end mills come with standard 3° and 5° fish-tail tips.  Smaller tips are cut-to-center.  Larger tips have a small center-hole.


Flute length


The flute length is given for each standard tool in the Tool Index.   All flute lengths are determined parallel from the tip to the the end of the large diameter,  not along the hypotenuse.


Shank diameter


All shanks are measured in "inch standard"-  3/8, 1/2, 5/8, 3/4, 1, 1-1/4, 1-1/2, and 2 inch.  Theleft handed spiral endmills have an extra 1/2 inch length due to milling purposes.


Large diameter multiplication chart below

 The table on the right shows the way to figure out what size your large diameter will be. The formula is worked out as follows...
Take the figure in the multiplier column x Flute length add your tip size.  The answer is the large diameter.
Taper angle per side Large Dia. multiplier
1/2° per side .01745
1° per side .03490
1-1/2° per side .05236
2° per side .06984
3°per side .10482
4° per side .13986
5° per side .17498
7° per side .24556
10° per side .35266
15° per side .53590
20° per side .72794
25° per side .93262
30° per side 1.15470
45° per side 2.000












If you have any other taper to figure out that isn't on the chart,  follow this example......
Large Diameter will be the tangent of your degree x 2 x Flute length + tip size.


  For a 6° tool, you would take the tangent of 6°, which is .10510 x 2 x your flute length + the tip size. Say you needed a 6° tool with a flute length of 1-1/2 inches and a 1/2 inch tip size, your tool would have a large diameter of (Tan x 2) .1051 x 2 =.2102 x (Fl len.) 1-1/2 + .5 (Tip size) = .8153 = large diameter

Modernization


   Conical is making big strides towards modernization of its production machines.  CNC machines made by companies like ANCA, Mazak, and Star, are now making closer tolerance tools possible.  All Conical Tools are CNC manufactured.


All Conical end mills come with limited warranty




Website created by William (WLA) Anderson