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New Old Shaper - Atlas 7b

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mexican jon:
 :Doh: :Doh:

tom osselton:
Sorry to hear that but it doesn't look all that bad I think they made that gear as a weak link there isn't much meat between the gear and the teeth. Is the double key one piece? Just wondering I didn't pull my gear off of it.

Manxmodder:
The same thing can happen with my Alba. On later models and the Elliot 3M(based on the Alba design) the feed screw threads taper out to minor dia shaft size and the nut runs out of thread before the crash can occur.

Just put this incident down to learning the do's and dont's of running a shaper. Maybe a good idea to modify the end portions of the screw when you rebuild the mechanism so it can't happen in future.

As Tom says,it is all repairable and a shaper without a power cross feed is seriously reduced in it's versatility and capability.......OZ

rockknocker:
Tom, yes the double key is one piece, or at least it appears to be. I haven't take that piece out yet either, as I've been continuing to use the shaper without the power feed. Shapers are supposed to be great at making spur gears, so I thought I'd use it to make a replacement gear. To that end, I do have an Atlas indexer attachment for this machine, although I wanted to get better at running the shaper in general before trying to use it, supposedly they can be a bit fragile.

OZ, I thought about turning down the thread to do just as you're suggesting, but was worried about the amount of table movement I'd be losing, or weakening, if those threads were removed. When items are bolted to the side of the table on this shaper, the table has to be almost all the way to one side in order to machine, although this would be less of a problem with an angled toolholder (the toolholder could be held out to one side to compensate). I'd be worried that the shaper would be set up for another type of failure if there was only a thread or two of engagement while power feeding. Have you ever been limited by this safety feature on your shaper?

Regardless, there will definitely be some form of anti-crash feature to keep this from happening again.

vintageandclassicrepairs:
Hi All,
Sorry to hear about the "crash"
I'm surprised that there's not a shear pin or soft key to prevent damage when something like this happens?
If theres supposed to be one, maybe if there was one it had beee replaced with the "wrong" material??

Regards
John

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