Threaded spindle mistake

[old martParticipant @oldmart]

See if you can spot the mistake on this page.**LINK**

[old martParticipant @oldmart]

[David Davies 8Participant @daviddavies8]

The mistake is that the chuck will loosen whilst accelerating in reverse. Applying the brake whilst running in reverse will serve to tighten the chuck to the spindle.

Dave

[old martParticipant @oldmart]

You got it in seconds, also it would not be normal to have a spindle brake on a lathe with a threaded spindle for obvious reasons. I watched as the charge hand switched on a brand new Myford Super 7 and the 4" chuck unscrewed, bounced onto the bed, then the tray on its way to the floor. I was dissapointed that it had missed the fools foot. I had to stone the bed to remove the bruise. The chuck was only rotating slowly when it fell.

[David Davies 8Participant @daviddavies8]

One must also be aware that inverters set to ramp down too quickly (possibly regenerating or using dynamic braking resistors) can cause a chuck to loosen when stopping while running forward.

Dave

[John HinkleyParticipant @johnhinkley26699]

I missed all that.

All I could think was "Where can I get a hover-chuck like that one?"

John

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