When faced with marking out a workpiece, either for positioning a hole to be drilled,
or an indication of the point to which it has to be machined, then a number of options
are available. Typically, using a rule, square and scriber, or a surface gauge or
height gauge on the surface plate, each having its advantages and disadvantages.
In many cases though, the little attachment in this article will provide an easier
and quicker method and be a more than adequate method of getting the dimension onto
the workpiece, Photograph 1. The device will hold both 25mm and 20mm wide rules and
would normally be used as the photograph shows but where the dimension is being set
from the end of a narrow workpiece it can still be used if the gauge is turned over.
Thy Body 1
This is quite straight forward but do drill the 6mm diameter hole “A” before machining
the area to take the rule. Also, having machined out the place for the rule to sit,
and whilst still in the vice, place a thin piece of packing under one edge to raise
it slightly and with a small end mill machine the slope as shown on the drawing,
Photograph 2. Its purpose is to ensure that the rule is securely held, the angle
though being unimportant.
The Clamp 3
This appears to be a difficult item to make but in fact it is quite simple being
more difficult to visualise and draw than make. Place a piece of 10mm steel in the
three jaw, turn a 12mm length to 6mm diameter, drill and tap M3 10mm deep and part
off at just over 18 mm in length. Return to the chuck and machine the face just parted
Next, mill a flat on the 6mm diameter to establish the 5.5mm dimension, Photograph
3, followed by tilting the clamp slightly and make the clamping face using a small
end mill, as was done for the body.
Turn the workpiece over in the vice and support the face just machined on a parallel
and make another flat to create the 2mm dimension shown, Photograph 4. Do note that
this is only over the length of the 10mm diameter. Then, with the workpiece still
mounted in the vice, in the same way reduce the width over the same distance to 3mm
and the part is complete.
The photographs show that I used a “vice in vice” method which is often beneficial
when machining very small components as it allows the part to be positioned away
from the machine and in some cases removed for measuring. Making the angle clamping
face was just a case of lifting one end of the small vice a little making this operation
an easy one.
When I turned the clamp over to machine the remainder I added a soft jaw enabling
me to machine fully to the end of the workpiece by machining into the soft jaw. Photograph
5 shows the completed clamp and also the soft jaw illustrating how the cutter had
cut into this.
The clamp screw needs no comment being a simple item. Photograph 6 shows the completed
item which I am sure will make many marking out tasks quicker and frequently easier
than other methods.
1. The marking gauge in use.
2. The sloping face being made by raising one end with a thin piece of packing.
3. Machining to the 5.5mm dimension, see drawing.
4. Machining to the 2mm dimension, see drawing
5. The finished Clamp together with the soft jaw that enabled it to be machined
to its end. See photograph 4.
6. The finished gauge.
All pictures can be clicked on to provide a larger view