Harold Hall


Lathe mounting methods

A method of mounting an indicator on the lathe that has been fairly common over the years is that shown in Photograph 8 (seen left of photograph 2) and if you have a spare holder in your quick change system then the arrangement could be left permanently set up Photograph 9. Photograph 10 shows another common method, (photograph 2 centre). A small vee block  is retained loose so as to provide the alternative of tightening the clamp either onto a flat surface or a round item. The block can just be seen in the photograph.


Dial Indicator arm

Above, I mentioned one method of holding a dial indicator using one half of a swivel joint mounted onto the indicator's barrel. Many indicators do also have a lug on the back for mounting purposes, in this case the mounting bar is a simple alternative. Photograph 11 shows the method.


Workshop Projects

Dial Test Indicator accesories, holders
Dial Test Indicator accesories, holders
Dial Test Indicator accesories, holders
Dial Test Indicator accesories, holders
Dial Test Indicator accesories, holders

Fine adjustment unit

Frequently, it is required to finely adjust the position of the indicator so that it displays the required value, zero in most cases, and often using the machines feed screws will provide this facility with ease. However, there are occasionally instances where this is not possible and some other means of fine adjustment would be helpful. Such a facility is almost always incorporated into the most common forms of surface gauges and magnetic base assemblies.


The fine adjustment unit illustrated in this article provides such adjustment and something a little more demanding to manufacture than the very simple items that make up the rest of the kit of parts.


Photograph 12 show an application for this item where in this case the angle plate is being tested to check if the top surface is parallel with the base, it was also seen in photograph 6. The set up uses the base, mentioned below but this is on the light side for this application. On the left is a base I made from a casting  from College Engineering Supplies that I would normally use but the user could of course make the base from thicker material to provide extra weight.