The saddle stop being used in these examples is a very simple one but adequate for
the majority of tasks.
With this type there are two methods of working. Distance gauges, of some form,
are held between the stop and the saddle by using the saddle feed handle to apply
sufficient pressure to hold it there, Photo 1.
With that done, the cutter is brought up to the appropriate face using the top slide.
Photo 2. Then, the gauges are removed allowing the saddle to traverse by the gauges
thickness. To set the depth of the bore about to be made in this case. In Photo 3
it would be to set the length of the reduced diameter being turned.
The alternative method, which does not use gauges, is to wind the top slide well
back and bring the saddle up to the stop using the saddle’s feed handle. Then, using
the top slide, bring the cutter up to the end of the part being turned and zero the
slides dial. The saddle is then moved away from the stop and the top slide traversed
by the required amount. In photograph 2 that would be the depth of the bore and the
length of the reduced diameter in photograph 3.
The stop in Photo 4 is being used to prevent the boring tool from contacting the
faceplate when boring a hole in the workpiece.
With the saddle firmly against the stop the top slide is used to bring the boring
tool almost up to the face of the faceplate.. The red card under the workpiece permits
the tool to just break through and complete the bore.
Some saddle stops will only work with the saddle moving right to left but the stop
shown will work both ways, Photo 5 and Photo 6. LINK