Revision 7 (Feb 2019)
Plate in position, set the Quill of the Mast onto the top edge of the Alignment plate (as in 4.4, figure 4
–
but keeping the Mast firmly locked to the Mounting Block), drag the Quill along the top of the Plate
toward the notch by rotating C. When the Quill “pops” firmly into the notch, that’s it. Reset the X
Home-0.
4.5.2 Y Positioning.
This is similar to the preceding section on X positioning
– except, that in making adjustments, instead of
moving the
tool’s
position, you are moving the
Mast’s
position. When you turn the Knob
– CW rotation
withdraws the Mast from the Tool Drive Motor, CCW rotation moves it closer to the Tool Drive Motor.
What you are actually doing, of course, is adjusting the position of the Mounting Block which carries the
Mast. At the end of the alignment process, the Y Indicator was left disengaged
—and there are
common conditions (described below) where engagement of the Y Indicator remains unnecessary
–
and so remains disengaged. When it is needed, however, the Y position is set on the Y Dial Indicator.
There is no strict Home-0 position for Y as there is for X. This is because Y positioning is a matter of
user judgment
–
until
a Y feature is added. Once a Y feature is added,
that
position can be used as a
positioning reference
– that is, when that position is selected, the indicator can be set so that
subsequent positions are measured and resettable. (
An observation:
Usually, the workpiece stone is
significantly narrower in the Y dimension than it is in the X dimension, making re-setting of the indicator
a less likely requirement).
At the start of the process (after completing alignment of the Mast to the Tool Drive Motor), set the first
working angle on the Mast, set the working height of the Mast (the
Z
direction) and, using the Knob
,
position the stone in relation to the tool. Turn on the Reciprocation Motor so that you can observe the
amplitude of the Tool’s movement, and set the stone’s Y position in relation to it – (a non-critical
judgment call).
If you are working with a cylindrical tool, with the Motor in Position 1, there is no reason to engage the Y
Indicator. If, however, you are working with the Motor in Position 2, you
would
engage the Y Indicator.
The Mounting Block has a range of 3”. Similar to the X situation, the Indicator has a range of 20mm
(8”). Read the part of paragraph 4.5.1 that deals with re-setting of the Indictor, if that becomes
necessary
—it works the same way as the X position (except that a specific Home position, as X has, is
replaced in the Y direction by a
selected
reference position (see the second paragraph of this section,
above, for a description of this setting).
4.5.3
θ
Positioning
This controls the angular position of the tool, in the horizontal plane, relative to the
workpiece.
Just as X, Y and Z are used to describe
linear
directions of positioning.
θ
, the Greek letter “theta” is used for
radial
positioning around an axis. We could have called it “indexing”, as it is called on the faceting Mast, but
here, the designation of
θ avoids confusion between those two devices.
θ positioning is on the Y traveling Plate, and the entire plate moves to any new θ setting. The axis of θ rotation
is the centerline of the Pivot Knob which intersects the centerlines of the Tool drive Motor in Position 1 and
Position 2
–
and so, this axis is directly associated with the Home-0 alignment
–
as the θ position is moved, the
tool remains on the θ axis
– allowing radial features
to be centered
around a settable point. θ can be set
through a full 180º range - settings in 5º increments are standard (1º increments are available with the HD
Protractor mod).