Next remove the centre and replace it with a small diameter end mill, I would suggest
5mm. Free the table's X axis (left/right)and traverse it by 33mm minus half the diameter
of the cutter being used. If you use my suggested 5mm cutter this will be 33 - 2.5
= 30.5mm. Plunge the cutter into the assembly and rotate the rotary table, Photograph
11. Repeat, progressively lowering the cutter, until the centre is fully cut out.
In addition to the cut out now being completed you will be left with two pieces of
steel that look like candidates for the scrap bin, Photograph 12, but I have other
With the frame still secured to the rotary table (as in Photograph 10 rather than
Photograph 13) set the top of the assembly at right angles to the table using an
angle plate and a suitable width piece of bar, Photograph 13, note the bottom of
the angle plate is parallel with the edge of the machine table. As the machine table
has not been moved on its Y axis (towards/away) the cutter is still central and now,
with a 12mm end mill, the 3mm deep channel at the top of the steady can be made.
Rotate the part 120° and make the second channel and repeating again for the third.
A lesson I learnt from making these steadies is that when space is limited using
a clamp sideways on may on occasions be helpful, unfortunately, too late for Photographs
9, 11 and 13 to show the method.
If the rotary table is a new process for the viewer, see my pages on Using a Rotary
Fix a fence onto the angle plate at an angle of 60° and use this to position the
bottom frame for making the triangular recess at the side, Photograph 14. Note how
the effective height of the angle plate is increased by allowing the workpiece to
project into the T-slot. With the first side complete, remove, rotate and machine
the second similarly.
Finally, make the two small curved areas that permit the top frame to hinge up by
filing them. An M6 washer having the appropriate outer diameter enabled me to easily
scribe the required curve.
Arms (4) (12)
As the arms are the same for both steadies, except for length, next cut the five
pieces required and machine their ends to length. Set a horizontal fence and a workpiece
end stop onto the angle plate and secure the arm in place and machine the 3mm deep