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| The Birth of a Grub Screw |
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| John Stevenson:
Why couldn't you have just used a bit longer set bolt and left the head on ? Just asking ? |
| Pete W.:
Hi there, Andrew, That's very interesting - an enviable facility. I didn't realise EDM was so quick, 10 mm in 15 minutes is much faster than I thought. What happens, corrosion-wise, to your Keats Vee angle plate when the fluorescent green tide goes out? Does the fluorescent green soup have corrosion inhibiting properties? If so, maybe that explains why it's so expensive. |
| awemawson:
--- Quote from: John Stevenson on December 07, 2013, 09:03:18 AM ---Why couldn't you have just used a bit longer set bolt and left the head on ? Just asking ? --- End quote --- 'cos I'm pig headed and wanted it 'original' :lol: (Actually I think the clamp arms would foul it.) Nice hole though isn't it :ddb: Andrew |
| awemawson:
--- Quote from: Pete W. on December 07, 2013, 09:18:56 AM ---Hi there, Andrew, That's very interesting - an enviable facility. I didn't realise EDM was so quick, 10 mm in 15 minutes is much faster than I thought. What happens, corrosion-wise, to your Keats Vee angle plate when the fluorescent green tide goes out? Does the fluorescent green soup have corrosion inhibiting properties? If so, maybe that explains why it's so expensive. --- End quote --- I was blasting rather faster than you would if ultra precision was called for - look at the bottom of the hole and you will see that the surface finish is quite granular, although the walls are smooth. At a lower current and hence lower speed the finish would be far better. Well not sure about the corrosion properties, but although I dug that Keates out of my ammo box of EDM bits yesterday it had last been used at my previous workshop six years ago and I doubt that I scrupulously cleaned it then. It was 'workshop ready' if not 'salesroom ready'. However when the bellows first started leaking I slide a bit of galvanised sheet in the tank to stop the splashes coming though the vents, and that sheet was very marked up to high tide mark after only a couple of months immersion. It's probably the zinc that causes the issue. Normally I use copper or graphite electrodes, but on the rare occasions that I've used brass for convenience the electrode wear has been much faster - again zinc involved. When it was first made the machine was designed to use paraffin as an electrolyte, and it would still happily use it, and it would be mammothly cheaper. But I hate the smell and don't fancy having large quantities of flammable liquids in the workshop. Andrew |
| NeoTech:
You got a diesink.. I just went "you gonna make an electroce for what?" and then went -"wtf, he got a die sink.. :bang:".. Screw is nice.. but that die sink ;) |
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