HiTorque 3990 Mini Mill

The LittleMachineShop.com HiTorque Mini Mill is the best in its class. It has the most power, the most torque, and a larger table than other mills in its class.

This mill has a solid column. It does not tilt from side to side. This construction is significantly stiffer than the tilting column on other mini mills. This model also includes the air spring head support for even support through the Z-axis range of travel.

The 500-Watt brushless spindle drive motor provides tremendous low-end torque. And you can vary the speed from 100 rpm to 2500 RPM continuously. There are no gears to shift. And, with no gears, the HiTorque Mini Mill machine is the quietest in its class.

The large mill table provides 50% more table area than other mini mills. It also has 30% more travel in each direction. The resettable feed dials allow you to zero them at any point.

The HiTorque Mini Mill has drill press handles for drilling and fast motion of the mill's head. It also has Z-axis fine feed with 0.001" resolution for milling operations.

This machine is shipped completely assembled and adjusted. Machined surfaces are coated with a viscous oil to prevent rust. It wipes off easily with a rag; no solvents necessary.

The LittleMachineShop.com exclusive version of this machine features:

• 500 Watt output spindle motor
• Large X-Y table
• R8 Spindle for wide tool availability
• Solid column that does not tilt
• NSK brand Japanese bearings
• Gas strut provides even support through the Z-axis range
• Dovetail column maintains head alignment at any height
• Fine feed on Z-axis for precise control
• Three radial handles for drilling
• E-stop safety power switch
• Adjustable Z-axis stop for repetitive drilling
• Neoprene bellows protect horizontal ways
• Adjustable gibs on all dovetail ways
• Includes R8 to 33JT drill chuck arbor and 1/2" drill chuck 
  
  

The HiTorque Mini Mill comes with the following:

• Mini Mill Users Guide written by Chris Wood
• 2 T-slot nuts with 3/8"-16 thread
• Three open end wrenches (8/10 mm, 14/17 mm, 17/19 mm)
• Four hex (Allen) wrenches (3, 4, 5, and 6 mm)
• One 45-52 mm spanner wrench
• Spindle lock pin
• Oil can (plastic)
• One 1/2" drill chuck and R8/JT33 arbor

The LittleMachineShop.com model 3990 HiTorque Mini Mill is a version of the SIEG X2.

See what the difference is between the SIEG drive system and the HiTorque drive system.

You can compare the specifications for our mills.

Let's compare the LittleMachineShop.com Solid Column HiTorque Mini Mill to mini mills with a tilting column.

The tilting column on other folk's mini mills tilts 45 degrees from side to side and it is possible to make some angled cuts. One user (and only one) has described to me a cut that was impossible to make any way but using a tilting column.

HiTorque mills have a solid column. The solid column has thicker walls than the tilting column, and a stiffer joint where it joins the base, so the column is significantly more rigid than the tilting column. It is not as easy to knock it out of tram as the tilting column mini mill. If you need to cut on an angle... angle blocks, tilting vises, sine vices, fixture plates, etc. are a much better way of ensuring and accurate cut.

LittleMachineShop.com no longer sells mills with a tilting column. That is an indication of how much better the solid column is.

• SX2LF 3990 Parts Diagram
• 3990_Mini_Mill_Users_Guide | LittleMachineShop.com