Photograph 1 shows the spokes of a clock wheel being machined, with the length being
controlled by the X axis stops and their width by the Y axis stops. First, one side
was machined using the X axis stops and one of the Y axis stops. Then, repeated for
the other Y axis stop making the second side. The rotary table was then moved through
72 degrees for each spoke.
Photograph 2 shows the boss and outer diameter being machined using the rotary table
and the same X axis stop positions, as was used for the spokes. The table was also
set against one of the Y axis stops, either will do.
I started approximately in the middle of the curved being made and the rotary table
rotated first one way and then the other, in each case stopping (visually) just
short of the spoke already made. The reason for starting in the middle was to avoid
the possibility of turning the rotary table the wrong way and hitting the spoke.
Photograph 3 shows the wheels as they came of the rotary table, with just a little
cleaning up needed.
The setting up process was as follows
1 Using a centre in the machine spindle and a centred plug in the bore of the rotary
table. Set the rotary table concentric with the machine spindle and secure the rotary
table onto the machine table.
2 Similarly, with a centred plug in the holding fixture, set the fixture concentric
with the machine spindle, making it concentric with the rotary table also. Add wheel
3. Traverse table in the X direction equal to half the boss diameter plus half the
cutter diameter and set the first table stop.
4. Traverse the table in the X direction by the spoke length minus the cutter diameter
and set second stop
5. Traverse the table in the Y direction by half the spoke width plus half the cutter
diameter and set the first Y axis stop.
6. Traverse the table in the Y direction, but opposite to that in 5, by the spoke
width plus the cutter diameter and set the second stop. Take note of backlash in
the feed when setting this stop.
7. The wheel can now be machined as described above.
Whilst not set for the clock wheels,Photographs 4 and 5 show the X and Y stops fitted
to my milling machine.