Harold Hall

Workshop Processes


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Using Keats and Vee Angle Plates

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 given as the purpose of the Keats is a task in which I have 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.. Photograph 2 shows them holding material at their maximum diameters.


Whilst comparing the two items it is also appropriate to compare them to a three or four jaw chuck that they may replace.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 was involved.


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.

Keats-Vee angle plates
Keats-Vee angle plates
Vee angle plate