Photograph 21, shows a large disk being held using the "thin piece larger diameter
clamps" (6) I have though since making my clamps increased the length given on the
drawing by 3mm so as to increase the depth of the jaw available for griping the workpiece.
Actually, to avoid having to make another set of jaws I intend to slot the fixings
to achieve a greater depth and it occurs to me that this may not be a bad idea as
it will permit the clamps to be adjusted to suit the thickness of the part being
Photograph 22 shows a more complex set up and is included just to highlight the fact
that the system allows a mix of clamping methods. The viewer may though consider
that this would be better done on the faceplate and this maybe so. However, the illustrated
method does permit fine adjustments to be easily made to the workpiece's position
that would not be so readily achieved if mounted on the faceplate.
Photograph 23 just shows a largish casting being held and really needs no further
Small diameters and squares also small disks are also catered for but I have not
included any photographs of these set-ups, I have though included Photograph 24
that shows the parts that are required for these situations. On the left is the jaw
attachment that is used for small diameters and squares and on the right a support
for small disks that are too small to use the set-up in photograph 21. Do when using
the latter only use the outer clamp screw for securing the workpiece.
Comparisons with a four jaw chuck
I would not be big headed enough to claim that this device wins in all aspects compared
to using a four jaw chuck but I do consider that overall it has many more pluses
On the minus side I can only suggest that in a few cases it takes a little more time
to initially set up and in a very few cases also be a little more difficult to finally
set-up the workpiece's position, though this latter problem may work to one's advantage
in a few situations as explained below.