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All Springer/NP/PCP Air Gun Discussion General > Machine Shop Talk & AG Parts Machining

How To Chuck Up This Bolt

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Ronno6:
I am trying to come up with a way to chuck this Crosman 760 bolt up in my lathe in order to turn an O-ring groove:

https://www.jgairguns.biz/760-c-78_89_173/crs760044-brass-bolt-p-10932.html

The magnet end steps down from .1865 to .1665.
The groove will need to be in the major OD near where it tapers down.
I have the groove figured out, I just need to find a way to hold the bolt.

Near as I can figure I will make a sleeve to make the OD big enough to grab with a 3 or 4 jaw chuck.
Then the short leg can be between jaws.
Either slot the sleeve or put a set screw or 2 to grab the bolt.

Or.........?????????????

sb327:
Sounds like you have it figured out, that’s the way I would go about it. Then you have a jig to do as many as you want.

Dave

Ronno6:
I wonder how well a 3/16" straight compression copper tubing fitting would hold it......

sb327:
Not sure how well that would work…

Dave

Ronno6:
As long as the probe is a close fit in the sleeve, the leg of the probe will function as a lathe dog by contacting the chuck jaw.
Interesting.....

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