Titivating a Wire EDM Machine

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awemawson:
So now to start dismantling the upper and lower runners for the curtain - all pretty fouled with accumulated build up of residues, now caked rock hard.

Starting with the brackets that tether the curtains on the outer edges

awemawson:
Then remove the 'upper track' - easy so far but this revealed a problem.

Some plonker in the past has mounted the lower track using ordinary HT cap screws, not stainless ones :bugeye:

awemawson:
Only two rusted cap screws, but in a confoundedly awkward place. As they are so low down on the base, the tray that surrounds the work space limits access. :bang:

The rear one had entirely rusted the head off, and the front one was so nearly completely gone that there was no chance of gripping it to unscrew, so I ended up grinding the remains away to allow removal of the lower runner

awemawson:
This has at least given me access to clean the work area up a bit - I'm actually amazed how well it's come up, and I'm not finished yet.
This is the result of the 'first clean' :

awemawson:
Now to get at those rusted screws I will almost certainly have to remove the stainless steel 'tray' that surrounds the work area. A pain as I didn't really want to delve in so far, and it's going to need sealing back to prevent leaks.

Meanwhile the runners are soaking in phosphoric acid (running short of citric !)

So how to drill out and re-tap these pesky screw :scratch: Any suggestions welcome if they mean I don't have to remove the tray - distinct case of 'scope creep' here :lol:

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