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Threaded spindle mistake
| old mart | 22/11/2020 21:56:25 |
| 4655 forum posts 304 photos | See if you can spot the mistake on this page.**LINK** |
| David Davies 8 | 22/11/2020 22:03:14 |
 202 forum posts 1 photos | 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 mart | 22/11/2020 22:11:58 |
| 4655 forum posts 304 photos | 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 8 | 22/11/2020 22:17:53 |
202 forum posts 1 photos | 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 Hinkley | 23/11/2020 09:18:40 |
 1545 forum posts 484 photos | I missed all that. All I could think was "Where can I get a hover-chuck like that one?" John
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All Forum Topics > Manual machine tools > Threaded spindle mistake