|Firstly, two adjacent sides machined to clean edges and set to be square.|
Then opposite sides machined to size and chamfered all round.
|Set up an absolute datum in the corner with the orange marker and "zero shift"|
the datum to positions over the work where the cut-outs are positioned.
|Twelve slots roughed out|
Aha! Found a way around it - use Google Chrome!
Next is the small switch slot and the volt meter hole is chain drilled to
remove the centre
All the oval holes are now secondary roughed
to create four sides in each hole.
All holes finished to size and volt meter hole
bored and counter sunk (chamfered to match
the external edges)