The Shop > Tools
Lathe Disaster!
John Hill:
A method I saw described involved clamping a decent sized piece of wood in the chuck so that when the chuck spindle is turned the wood will hit the ways (or the wall, or the bench etc).
Then, because you want to unscrew the chuck, take hold of the wood and with all your might turn the lathe backwards. In theory, when the wood hits the ways the chuck will stop and the inertia of the spindle will cause the chuck to unscrew without breaking any gear teeth.
If you do choose a method that involves locking the gear train take up all the slack by putting as much pressure on the gears as you can before striking the blow.
John
The Artful Bodger
NickG:
Thanks guys, a few methods to try there.
Unlike other lathes I've had though, there is no release pin for the back gear on the Harrison, never really looked into how it works but it's just another set of ratios engaged with a different lever.
Forgot to count the teeth and photo the gear last night. Need to as there's one ending on ebay on Thurs night. Found a couple of places that do change wheels too but not cheap!!!
websterz:
--- Quote from: John Hill on May 26, 2009, 03:06:57 PM ---A method I saw described involved clamping a decent sized piece of wood in the chuck so that when the chuck spindle is turned the wood will hit the ways (or the wall, or the bench etc).
Then, because you want to unscrew the chuck, take hold of the wood and with all your might turn the lathe backwards. In theory, when the wood hits the ways the chuck will stop and the inertia of the spindle will cause the chuck to unscrew without breaking any gear teeth.
If you do choose a method that involves locking the gear train take up all the slack by putting as much pressure on the gears as you can before striking the blow.
John
The Artful Bodger
--- End quote ---
4x4 in the chuck...that's the way I was taught to do it. :thumbup:
NickG:
Hi all,
The number of teeth on the smashed gear is 50 and have found a place that I can get a 50 tooth for £15 which is great, bizzarely, this place I found on google is 8 miles away from where I work too. Only problem is it's this special 'soft' gear that's bolted to a hub, however, I guess I could use a normal steel one if I make a bush up to suit its arbor.
Here is a pic of the gear. The plain gear is the one it meshes with but is the same size.
Nick
sbwhart:
Nick is it possible to lock it up with something passed through the spindle bore, a long bolt with a nut one end or something :scratch: just trying to get a train of thought going.
Stew
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