What size is the LongMill?

Once assembled, each model of the LongMill (12×12, 12×30, and 30×30) is designed to generally fit on a 2×2′, 2×4′, and 4×4′ surface respectively. The diagrams below show a more detailed view for each model:

  • The red area inside the main box shows the cutting area as an offset from the foot base. It’s based off the center-point of the router, thus you can plane an area larger than what’s stated if you’re using a large surfacing bit.
  • The blue area outside the main box shows the hanging parts as an offset from the foot base which makes up the total machine outline.
  • If you have the dust shoe attachment in place, it’ll reduce your cutting travel in the X-dimension by approximately 50mm.


At the end of the day, this leaves you with:

ModelLongMill 12×12LongMill 12×30LongMill 30×30
Cutting area307mm x 345mm
(~12″ x 13.5″)
792mm x 345mm
(~31″ x 13.5″)
792mm x 845mm
(~31″ x 33″)
Max stock width (distance between feet)435mm (~17″)920mm (~36″)920mm (~36″)
Machine area650mm x 610mm
(~25.5″ x 24″)
1135mm x 610mm
(~45″ x 24″)
1135mm x 1110mm
(~45″ x 44″)
Machine heightAbout 14″, but if you’re planning to build an enclosure you should make it at least 20″ tall to ensure enough space for hose management, manipulating cutting material, etc.


If you’re looking to properly size a space to put your machine or are making a dedicated table, ensure that you leave enough room for the LongMills control box and any other peripherals that you might be using like a laptop, monitor, keyboard, etc.. The control box is roughly 150mm x 280mm, has holes so that it can be easily screwed or mounted to any surface, and has a USB port on its left side which allows for you to connect your computer to control the machine.

By default the clearance height under the X-axis rail is 104mm (~4″) so if you’d like to take advantage of the full 113mm (~4.5″) of Z-axis travel that the LongMill has to offer, the feet can be spaced up by two strips of material on each side to gain more height clearance. If you’d like to see some tables that our community members have built for their own machines, we’ve got a page on it here: Community Table Builds