Conventional Knee Mills

Willis Machinery & Tools Co.

Willis Conventional Knee Mills:

  • Willis Vertical Knee Mills
  • > 9" – 12" x 49" – 59" Table Sizes
  • > 32" – 47" X-Axis Travels
  • > 13" – 17" Y-Axis Travels
  • > 16" – 20" Knee Travels
  • > 3hp & 5hp Spindle Motors
  • > R8 & 40 Taper Spindles
  • Call us for a free Willis Vertical Knee Mill quote today! - (419) 537-1717

Toolroom Titans!

Willis conventional knee mills have served many industries, including job shops, aerospace, the energy industry, and many others, with their high precision and extremely durable construction for many years. Available in many configurations (i.e. with dovetail or box ways, 3HP or 5HP spindle motor(s), and R8, 30, or 40 taper spindles), the Willis conventional knee mills will meet the demands of virtually all conventional knee mill demands. NRTL approved machines available upon request.

Conventional Mill Machines

“Willis Machinery” offers five different models of vertical knee mills, both conventional and CNC. Our mill machines range from the model WM3VS, 3 horsepower (3HP) variable speed, R-8 spindle mill machine with a 9 inch x 49 inch table, to a massive 5 horsepower (5HP), 40 taper spindle, Series II style machine with a 12 inch x 59 inch table providing 47 inches of x-axis travel.

Willis 1050 Knee Mill Intro

Willis 5000VS Knee Mill Intro

WM3VS Knee Mill Demonstration


1050II Knee Mill


1250II Knee Mill

Willis Knee Mills Features

  • Our 5000VS model has 5HP variable speed 60-3600 RMP, 40 taper spindle. It has a hardened ground table surface with built in tool trays on either side, with a chrome plated precision ground quill, full 4-1/8" diameter.
  • Willis conventional knee mill models 1050 and 1050II are dovetail and square (box) way machines respectively. These mill machines are 3 horsepower (3HP), R-8 spindle machines, with an optional 30 taper spindle. The vertical mill model 1250II is a 5 horsepower (5HP), 40 taper spindle machine, with square (box) ways.
  • Our mill machine model WM3VS has a rounded ram and column. The knee mill models 1050, 1050II, and 1250II have heavy duty square rams and columns with substantial knees and saddles. These mill machines all maintain “Meehanite” castings with hardened and ground ways as well as “Turcite” coating the adjacent surfaces.
  • Willis conventional mill machine models WM3VS through 1250II are optionally available with electronic variable speed, through a “Yaskawa” inverter, known as the “EV” (electronic variable) models. The electronic variable speed option provides these vertical knee mills with up to 5000RPM in spindle speeds. “EV” spindle speeds are infinitely adjustable through a potentiometer.
  • The vertical knee mill models WM3VS through 1250II are supplied both as conventional mill machines and CNC mill machines.
  • The 1250II head is designed for extra rigidity, with right to left tilt, but without a front to back knuckle.

5000VS Knee Mill


5000VS Knee Mill


5000VS Knee Mill


Dynamically balanced pulley with special bronze key attached with 2 screws prevents premature breakage.


Our standard spring type micrometer adjusting nut provides quick and easy movement for setting spindle depth.


Our special power down feed parts are so strong, they can be used over 3,000 RPM spindle speeds. Our 1 piece cluster gear is superior to the much used 3 piece design.


Our design uses splined shafts which are much stronger and more rigid than the keyed shafts.


Heavy duty knee with box ways provide the rigidity needed for superb support over the full range of travels.


1050II and 1250II tables are capable of supporting loads from 1,100 – 1,500lbs, respectively.


Spindle Bore Runout. Less than 0.0004”


Spindle Running Noise Measuring. Less than 73 db at 1 meter


Parallelism of Table Surface to Table Cross Travel Movement. Less than 0.0008" per 12" of travel


Squareness of Table Surface to Knee Travel. Less than 0.0008" per 12" of travel


Squareness of Table Surface to Quill Travel. Less than 0.0008" per 5" of quill travel


Measuring of Squareness of longitudinal Travel to Cross Travel. Less than 0.0008" per 20" of travel


Parallelism of Table Surface to Table Longitudinal Movement. Less than 0.0008" per 20" of travel


Parallelism of Table Surface to Ram Cross Transverse Movement. Less than 0.0008" per 12" of travel


Stiffness of Head and Quill Combination.