Tool Time

[tbone]

Metal Marking Tools

Divider.
The divider looks like a set of calipers but has pointed ends at the bottom of the legs.
It is used for scribing circles or arcs and for marking out distances.
To stop the divider from slipping on the work surface, a prick punch should be used to locate one leg of the divider.
The divider points need to be kept sharp to ensure accurate work.

[tbone]

Metal Marking Tools

Punch.

There are 3 basic punches used in metal marking.

The first is a centre punch. The angle of the point on the centre punch is 90deg, this produces a wide but shallow mark and provides a good seating to start a drill bit.

The second punch used is a dot punch. The angle of the point on this punch is 60deg making a smaller deeper mark than the centre punch. The dot punch is used to make witness marks for marking out.

The third punch is the prick punch. This has a 30deg point angle and is used almost exclusively for marking out when using a pair of dividers, as the 30 deg angle is perfect for seating the point of the divider leg.

[Manky Monkey]

Concise & informative as always Tim. Thank you.
We'll add these to the main website once we get it up & running again.
There's always more you can learn isn't there -I've never seen a centre square before. Not quite sure how it works.

[tbone]

Concise & informative as always Tim. Thank you.
We'll add these to the main website once we get it up & running again.
There's always more you can learn isn't there -I've never seen a centre square before. Not quite sure how it works.

I`ll add a picture especially for you 

[Manky Monkey]

Just for the spethial people. 

[TwistedPatience]

Odd leg Jennys (No! not a woman with one leg shorter than the other, called Jenny) or Hermaphrodite calipers, which have one leg bent inward and one straight leg ending in a sharp point, are used for scribing lines at a specified distance from a flat or curved surface.

[tbone]

Cheers Doc, I missed that one