For me, this project relates to a repair job, but for the viewer it is intended to
be the basis for a new workshop project. Even so, some readers may also like to apply
the modification to an existing knurling tool.
Briefly, the background to the article is that I made a two wheel knurling tool based
on the very common design, Photograph 1. However,I had just purchased a belt sander
and thought it would be a good idea to put it to use to give the parts an improved
finish. Being new to the machine I was unaware just how much the machine could remove
in a short time. Due to the increased clearance that resulted the ends of the arms
where they carried the knurls could be moved left and right by much more than was
Whilst not ideal, I persevered with it for a few years until I decided that I would
modify the tool placing plates on either side to minimise the sideways movement.
Photograph 2. Researching the design, that I thought was quit common, I could not
find a commercial example of it, all being of the type shown in photograph 1. Of
course, there are many very expensive and quite different designs intended for use
in industry. The only examples I could find were in issues of the Model Engineers'
Workshop and with Hemingway Kits also providing a kit for a version . It would appear
therefore that it is very much a home workshop idea.
Not having to make many of the items, and only increasing hole sizes in other cases,
I have not had the option of taking photographs of the processes, the article is
therefore largely the design drawings. For the vast majority of readers this will
not present a problem as the parts are all relatively simple items. If any reader
would like more detailed explanations of the manufacturing processes and can obtain
issues 78 and 79 of MEW these will give the details required. However, do work solely
to the drawings provided with this article as they differ from those in the earlier
Some brief comments regarding its manufacture may though be of help. The aim to
minimise the sideways movement possible at the end of the arm and this calls for
the requirement to be considered when making the parts.
Firstly, the 8mm dimension achieved on parts 6 and 11 should be identical, within
say plus 0.02mm, and not less than 8mm else the knurling wheels will not enter between
the two arms.