Member postings for Robert Betteridge

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Thread: edm machines

10/12/2020 13:27:37

I met Maurice's machine and loved its capacity to make blind square holes but haven't the electronic nous to make one.
Instead I bought a Watton Electronics Ltd "Arc-out" Model 1B (from 1965 or so).
It lacks electrodes, and herein lies my question - how are they attached?
The fitting is a brass thread 1/4" x 26 BSF, with an axial hole of variable diameter through which water is supplied, the bottom of this fixing ("a" is rough.
This is capped by a nut, closed at the bottom with hole .165" ~ 4,19mm in diameter.
A "lollipop" with a cylindrical head could be retained by the cap but - "a" is rough ; this would leave a tube, od 4mm, id circa 1mm., which would be rather fragile if threaded.
I suppose larger diameter tubes could be added and secured with a side locking screw, or did Watton have another way?

Kind regards, Rob.

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