A number of viewers have said that they could see no reason for the variable stroke
mechanism particularly as some commercial machines do not provide the feature.
For me, I added it initially as I had no experience with filing machines and decided
that it would be good to experiment with differing stroke lengths. My early experience
with the machine made me question whether the feature did serve a purpose.
However, when eventually I was making a skeleton clock with the frames and gear spokes
needing a lot of finishing on their edges, I found that a shorter stroke length was
beneficial for the task.
If you feel though, that with your need for the machine a fixed stroke would be
adequate it is not that difficult to incorporate it into the design, it will certainly
save quite a bit of work and time in making the machine
Whilst I have intended producing drawings for the version, as yet the time for the
task has not surfaced. However the modification is not difficult to explain.
Make the Body (51) as a plain disk, that is without the dovetails, but still including
holes A and B for screw H55 which fits it to the drive spindle. Also drill and counterbore
a single hole to take the ball race using the bush (55) and washer (54) as was done
for fitting it to the Bearing Carrier using holes C and D
It would be easy to drill a number of these holes at differing distances from the
centre of the body so that you had some control over the stroke length. Hope this
The Variable Stroke Mechanism starts on the next page