Milling clamps for Mini-mills
setupView larger image

A set of simple clamps for mini-mills, it is using a thread rod for the balance support and can be fine adjusted  to the suitable height for holding a work piece on the milling table.

Materials, a piece of 3/4" X 3/8" carbon steel bar. Any kind of steel will work, a 1018 carbon steel bar is used, and  two pieces of thread rods, 1/4"-20 and 3/8"-16.
Cut 2 sets of thread rods for each clamp, 3 pieces are cut from the 3/8"-16 thread rod of 2", 3" and 4" long, and 3 pieces are cut from the 1/4"-20 thread rod with about 2.25", 3.25" and 4.25" long.
setupView larger image

The steel bar is used for making the clamps and T-nuts. Two pieces of 3" long for the clamps and two pieces of 0.75" long for the T-nuts.
The clamp is tapped with a 3/8"-16 threaded hole at 0.5" from one end, and mill a slot hole of 1/4" X 1.25". The other end is made with a slightly reduced size.
The width of the T-slot on the mini-mill table is 19 mm, 3/4" T-nut will just fit into the slot. The T-nuts are tapped with a 1/4"-20 threaded hole at the center.

setupView larger image

This is a setup of a 1/4" thick work piece. The work piece is rase up by a set of 1-2-3 blocks that the end mill can reach to the work piece.
sherlineView larger image

The similar smaller size version for the Sherline mini-mills.
clamp-parts1View larger image
The clamp is made by a 1018 0.25" X 0.625"  steel bar. A 1/4"-20 threaded hole is tapped on 3/8" from one end, the slot  hole is  0.19" X 1".

The support thread rods are 1/4"-20, 3 pieces are cut  with 1", 2" and 3" length.

The #10-32 thread rod can not be found, using 1", 2" and 2.5" screws instead by removing the screw head.

The T-nuts are made by a 1018 0.5" X 0.375" steel bar. The short T-nut is about 0.3" height. The tall T-nut is about 1" tall, it is turned into a round section with about 0.375" in diameter and is tapped with a #10-32 threaded bind hole. 
View larger image

Another version of self-adjusted milling clamps for Sherline mini-mills.  
View larger image

All the parts are made by 1018 carbon steel, a piece of 0.5" x 0.375" flat bar, a piece of each 0.75", 0.5" and 0.375" diameter round rods.

The finished components for assembling a pair of clamps.
View larger image

The pair of milling clamps assembly, looks like a sine bar.
main-bodyPage 1 drawing (PDF file) supportPage 2 drawing (PDF file)