Mini Desktop Spindle Square & Tramming Tool

Mini Desktop Spindle Square & Tramming Tool

Metric Spindle Square | Standard Spindle Square

Photo Credit: Mario Merendon | Whiskey Jig


We have had quite a few requests to make a Spindle Square specifically for those to tram in their desktop routers and milling machines. We found our standard spindle square works great, but z-clearance and shank diameter was an issue. After receiving many custom orders we modified the shank to give the clearance needed to help true up those machines.

The spindle square is adjustable with 3/8 holes for 3-6″. It can be used to tram on multiple vise sizes, and machines such as your mill, drill press, sine bar and lathe. You can use any indicator with a 3/8 stem so you can install a brand or resolution of your preference. The hardware will never rust and shouldn’t damage your indicator unless you over-torque the thumbscrew.

Important note: Make sure you verify you have 4.25 inches of clearance under your gantry to swing the spindle square 180 degrees for calibration.

Spindle Square Specifications

  • Main body is made out of 6061 Aluminum and measures at 7″ by 3/4″ by 3/4″ with a brushed finish
  • 3 1/4″ stepped shank, 1/4″ for 1 1/4″ then to 1/2″ with a 18-8 stainless set screw to retain
  • 1/4 by 1/4″ rare earth magnet for zero’ing square attached to square so it isn’t easily misplaced
  • Brass 8-32 x 3/8 thumb screws to retain indicators
  • Made on CNC equipment in OR, using USA made materials.

Dial Indicators

  • Large easy to read white face with crisp black graduations
  • .25” total travel
  • 0.0005″ graduations
  • Color may vary
  • Made in China


  • Outside dimensions: 10.1″ x 8.0″ x 3.2″
  • Snap latch; Large comfortable handle
  • Rugged polypropylene with handsome textured finish
  • Thick foam padding
  • Made in USA


Keith Rucker over at did a wonderful overview of the product and how to use this exact model on your milling machine to align the spindle to your table.

Randy Richard in the Shop has also done a great overview using this Spindle Square to square his mill table utilizing an outside reference.

Instruction Manual – Designed to be a living document. Please feel free to make comments and improve over time.


Spindle Square Only $47.50

Spindle Square with .0005 Indicators & Case $115


Spindle Squares are shipped via the United States Postal Service in either first class or flat rate padded envelopes/boxes. They are shipped bare tool with indicators packed in original foam padding and white boxes.

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