Our own words used against us…

Warning! Beware! Whilst out “shopping” (I know, but it’s best just to go along with it) with Senior Management and despite my best efforts, she spotted the shoe shop. She uttered these sinister words: “you know how you always say “one can never have too many clamps…””

It’s a year since I made my first post. To be honest, I didn’t think I could keep it going. But I must say, I’ve quite enjoyed it! (Obviously. Otherwise I would have stopped)

What surprised me was the amount of people from so many countries around the world who’ve had a look, some more than others. It would be great to get comments from folks.

I think I’ve mentioned in a previous post how it can sometimes be difficult to keep up the posts. In fact, though, my average is one a week. That’s not so bad, I think. The thing that stops me is the feeling that I have too many other higher priority things to do, and so the blog never comes to the top. This has been caused by a tremendously high workload as we’ve been training new pilots non stop since May. The second half of the year has been particularly stressful, actually causing me to need some unfit days as it’s upset my system (I’m diabetic – yes, you’d be surprised what conditions you can carry and still be an airline pilot. We’ve got people with one eye, one ear, one arm, one leg. Recovered heart attack, recovered cancer, recovered alcoholics, recovered depressives. All safe, sound and a great example to others)

Refurbishing this lathe has been as therapeutic as I’d hoped. Now that this year is almost out, I can look forward to something brighter next year. Which brings me to these chucks. They weren’t that bright as found…

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…and, of course, full of gunge.

Dismantling a three jaw chuck

No diagrams available so flying blind, a voyage of discovery, journey into the unknown, etc blah blah. How hard can it be? I unscrewed the obvious hex bolts on the back…

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…and the sides…

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The back came off easily…

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Unscrewing three more pins enabled the cone shaped gears to be withdrawn…

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Then I realised the jaws were still in, so before removing the other two gears, I turned them using the key and all three jaws dropped out. The annular gear turns and there seemed to be nothing holding it in, but it wouldn’t just drop out, even with banging it on the bench. Naturally, brute force was called for, so I set up the three side pins and sat the chuck over them, with the points touching the ring…

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Using a block of wood between the hammer and the chuck, the annular gear popped out easily…

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Here’s all the parts before cleaning…

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Both the annular ring and the cone gears were caked in a white substance…

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It was not quite solid but even after soaking on GUNK it was very difficult to get off…

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It took a long time, with each tooth needing done individually. Eventually everything was clean and bright. It was all in good condition too…

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Rebuilding the three jaw chuck

Assembly was easy. I used a lot of grease on everything…

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These wedge cone type things…

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…engage some grooves on the back, obviously to hold it tight…

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The jaws are all numbered and there’s a corresponding number against each slot…

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This is so they go back in the right place, so that they follow the spiral in the annular ring evenly. They go in and out quite easily, by turning the key to wind them in…

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This is the cleaned and reassembled chuck…

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…and it fitted to the lathe…

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That was quite good fun. Four jaw chuck next. Or a book review?

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3 thoughts on “Our own words used against us…

  1. hiya

    A good and thorough job as always

    Using grease in a three way chuck is great for lubrication however it is also very good for trapping swarf. This makes the chuck bind up and causes all kinds of interesting behaviour. especially when machining brass which has nigh on magical properties for getting into crevices.

    Using as little as possible oil (excess will be automatically evacuated and well keep the ceiling rust proof) is recommended.

  2. That’s an interesting point. I just assumed that because “it’s gears” it would need grease. But, I suppose it’s not in constant rotation, so oil would suffice? Ah well, I’ve done them all with grease now. We’ll see what happens. If I have bother with one, I can degrease the others easily enough and oil them.

    Maybe I should have started with a statement like “I’m about to do some chucks and I’ve no idea what I’m doing. Does anyone have any advice?”!!

  3. Hi Jim, regards “Does anyone have any advice” I think you have done a remarkable job and the blog has probably inspired others to undertake work they might have been wary to start. However the next stage is” what will I make first” and that’s where sage advice might be useful. Local model engineering clubs would be a good start if you have not done that already.

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