Have you ever been here?

This topic has 8 replies, 7 voices, and was last updated 12 June 2019 at 11:41 by Mick B1.

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6 June 2019 at 04:20 #35504
Blue Heeler
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@blueheeler
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6 June 2019 at 04:20 #412853
Blue Heeler
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@blueheeler
You're doing a few hours on the lathe, everything is coming together and the parts are slowly building up and you're doing lots of different operations.

Then all of a sudden the lathe isn't cutting right, you check everything and then everything once again. You start to think "What the hell has happened to the lathe"?

You keep looking for what has happened and why you can't make a simple cut??????……and then you notice it.

The motor is in reverse
6 June 2019 at 05:23 #412854
not done it yet
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@notdoneityet
Fairly obvious? Too tired?

Mill does that as the VFD defaults in direction when the power is cut – simple solution is to set the vertical operation as default setting and the horizontal is easily spotted before trying to cut, if not changed over, as the cutter is running so much more slowly.
6 June 2019 at 08:59 #412873
Mick B1
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@mickb1
Yes, it still happens occasionally.

Most of the screwcutting I do is Imperial on a Metric lathe, which means leaving the halfnuts engaged and reversing back to (start minus backlash) for each pass. Sometimes I'll realise I've reached the right depth after reversing out, and break down to start some other op without remembering to switch back to for'ard.

But the symptons are pretty recognisable, and it doesn't generally fool me for more than a second or three these days.
6 June 2019 at 18:08 #412976
Pete Rimmer
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@peterimmer30576
Posted by not done it yet on 06/06/2019 05:23:51:

Fairly obvious? Too tired?

Mill does that as the VFD defaults in direction when the power is cut – simple solution is to set the vertical operation as default setting and the horizontal is easily spotted before trying to cut, if not changed over, as the cutter is running so much more slowly.

An even simpler solution is to swap any two of the three phase wires to the motor. Then the default direction will be the direction you require.
6 June 2019 at 18:35 #412985
AdrianR
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@adrianr18614
Yeup yesterday, I was really puzzled why the auto feed was going away from the work.
6 June 2019 at 20:15 #413006
Boiler Bri
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@boilerbri
Yes too tired.

My bug bear once, was the tip being loose in the holder. It took me ages before i found it. Doh

Bri
12 June 2019 at 11:07 #413875
Nigel Graham 2
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@nigelgraham2
Tiredness is one of the main causes of simple mistakes.

Yet it's strange how the more experienced we are, the less we notice the simple and obvious when things go wrong; and instead look for the most abstruse / expensive / inconvenient solution first!

I am told by medics, medics are even worse. A few sniffles and a headache and it's death's door with agues, plagues and bad humours of the spleen; when all they've done is catch a cold.
12 June 2019 at 11:41 #413884
Mick B1
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@mickb1
Posted by Nigel Graham 2 on 12/06/2019 11:07:04:

…

Yet it's strange how the more experienced we are, the less we notice the simple and obvious when things go wrong; and instead look for the most abstruse / expensive / inconvenient solution first!

…

Yes.

I blame Conan Doyle – you know, the old Sherlock Holmes quote: "Once you have eliminated the impossible, whatever remains, however improbable, must be the truth…"

So when confronted with a conundrum, the first thing you look for is the most impossible, in order to eliminate it first; and before you know it you've wasted ages eliminating the impossible before you even get to the plausible.

I sometimes used to find myself doing this when part of my job was bug-hunting in manufacturing planning software.

I reckon that idea's the worst possible way to investigate anything, and it's probably wasted more mental resource than all the broadsheets' crosswords.

Edited By Mick B1 on 12/06/2019 11:51:20
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