Elsewhere on the site I have detailed the methods that I adopted for machining both
a Keats Angle Plate and a Vee Angle Plate, Photograph 1. Here, I briefly compare
them and give some idea as to their uses as far as I can. I say “as far as I can”
as what is frequently explained as the purpose of the Keats is a task in which I
have very little experience, more about that later.
The two compared
Whilst both can satisfy what most will consider to be their main use, that is to
be fixed to the faceplate where it will be used to hold a round component, either
on, or off of, centre, the main difference is in the size of the workpiece that can
be held. In this respect the Keats will hold diameters up to 75mm whilst in theory
still hold very small diameters, say 8mm, it would though be rather unwieldy for
such small workpieces.
The maximum diameter that the Vee angle plate holds is 50mm and therefore much more
appropriate at smaller diameters. To illustrate the differences Photograph 2 shows
them holding material at their maximum diameters.
Whilst I am comparing the two items it is also appropriate to compare them to a three
of four jaw chuck that they may replace in some applications. Taking my 100mm three
jaw chuck the maximum diameter that can be safely held using the standard jaws is
30mm diameter and at a jaw depth of 15mm, this comparing with a depth of 45mm for
the larger Keats. This greater depth would be of considerable benefit if a long workpiece
At even larger diameters where the reverse jaws are required the gripping length
of the chuck jaws is just 7mm, the Keats being a vast improvement in this situation.
On the down side, ensuring the part is running true is quite a tricky operation for
the Keats. Comparisons would be similar when holding larger square material compared
to using the four jaw chuck. To a lesser extent, similar benefits are provided by
the Vee angle plate.
The Vee angle plate can though be set up with the vee horizontal to the base when
it could then be used as a conventional vee block. However, a definite plus is the
presence of fixing lugs that make it easier to secure on the machine table or even
the faceplate, Photograph 3.