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Posted by Grant Erwin on April 10, 2006, 12:29 pm
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A buddy is making the Parrot field rifle from the 1982 HSM plans. He asked me to
make him the part which has a capstan-type bolt head which has 4 1/8" rods
radially arranged with 1/4" balls on the end. He had thought he could bead 1/8"
welding rod with a gas flame and get a nice ball, but he failed. I just couldn't
imagine turning a ball on a 1/8" shank without it bending, so I thought for
awhile, then took a 1/4" ball bearing and some old copper-clad 1/8" welding rod
(gas welding) and made one. This is how I did it.
I put the 3-jaw chuck on the lathe, and chucked a short piece of the 1/8" rod
and spun it at high speed and applied some abrasive cloth to remove the copper
and polish the rod. Then I rechucked it so only about 1/4" was sticking out, and
took a small center drill in the tailstock chuck and made a light centered spot
in the end of the rod, just enough to get some clearance. Then I took a 1/4"
ball end mill and chucked it in the tailstock chuck and again at high speed fed
it into the rod until I had a nice spherical female end. I took a small smooth
file and cleaned the edges. Then I re-chucked the rod so it stuck out about 1",
and chucked a piece of 1/8" pipe in the tailstock chuck. I used the pipe to
center the ball bearing and press it against the rod. I fluxed it with white
flux and using silver bearing solder (low silver content) soldered the ball to
the rod. Then I backed off the 1/8" pipe and spun the part and polished it. The
ball isn't quite dead centered but it's way close enough, and it was quick and
easy. The low silver content solder matches the color perfectly and you have to
look very closely to see any fillet after polishing.
GWE
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Posted by Lew Hartswick on April 10, 2006, 9:53 pm
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Grant Erwin wrote:
> A buddy is making the Parrot field rifle from the 1982 HSM plans. He
> asked me to make him the part which has a capstan-type bolt head which
> has 4 1/8" rods radially arranged with 1/4" balls on the end. He had
> thought he could bead 1/8" welding rod with a gas flame and get a nice
> ball, but he failed. I just couldn't imagine turning a ball on a 1/8"
> shank without it bending, so I thought for awhile, then took a 1/4" ball
> bearing and some old copper-clad 1/8" welding rod (gas welding) and made
> one. This is how I did it.
>
> I put the 3-jaw chuck on the lathe, and chucked a short piece of the
> 1/8" rod and spun it at high speed and applied some abrasive cloth to
> remove the copper and polish the rod. Then I rechucked it so only about
> 1/4" was sticking out, and took a small center drill in the tailstock
> chuck and made a light centered spot in the end of the rod, just enough
> to get some clearance. Then I took a 1/4" ball end mill and chucked it
> in the tailstock chuck and again at high speed fed it into the rod until
> I had a nice spherical female end. I took a small smooth file and
> cleaned the edges. Then I re-chucked the rod so it stuck out about 1",
> and chucked a piece of 1/8" pipe in the tailstock chuck. I used the pipe
> to center the ball bearing and press it against the rod. I fluxed it
> with white flux and using silver bearing solder (low silver content)
> soldered the ball to the rod. Then I backed off the 1/8" pipe and spun
> the part and polished it. The ball isn't quite dead centered but it's
> way close enough, and it was quick and easy. The low silver content
> solder matches the color perfectly and you have to look very closely to
> see any fillet after polishing.
>
> GWE
How about friction welding it on???
...lew...
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Posted by Robert Swinney on April 10, 2006, 10:39 pm
Please log in for more thread options Friction welding. Yeah, that's the way Grant's post "read" to me the first
2 times I read it. What with all the talk of high speed, less than very
careful reading would lead to the assumption he was friction welding, at
least to me, anyway.
Bob Swinney
> Grant Erwin wrote:
>> A buddy is making the Parrot field rifle from the 1982 HSM plans. He
>> asked me to make him the part which has a capstan-type bolt head which
>> has 4 1/8" rods radially arranged with 1/4" balls on the end. He had
>> thought he could bead 1/8" welding rod with a gas flame and get a nice
>> ball, but he failed. I just couldn't imagine turning a ball on a 1/8"
>> shank without it bending, so I thought for awhile, then took a 1/4" ball
>> bearing and some old copper-clad 1/8" welding rod (gas welding) and made
>> one. This is how I did it.
>>
>> I put the 3-jaw chuck on the lathe, and chucked a short piece of the 1/8"
>> rod and spun it at high speed and applied some abrasive cloth to remove
>> the copper and polish the rod. Then I rechucked it so only about 1/4" was
>> sticking out, and took a small center drill in the tailstock chuck and
>> made a light centered spot in the end of the rod, just enough to get some
>> clearance. Then I took a 1/4" ball end mill and chucked it in the
>> tailstock chuck and again at high speed fed it into the rod until I had a
>> nice spherical female end. I took a small smooth file and cleaned the
>> edges. Then I re-chucked the rod so it stuck out about 1", and chucked a
>> piece of 1/8" pipe in the tailstock chuck. I used the pipe to center the
>> ball bearing and press it against the rod. I fluxed it with white flux
>> and using silver bearing solder (low silver content) soldered the ball to
>> the rod. Then I backed off the 1/8" pipe and spun the part and polished
>> it. The ball isn't quite dead centered but it's way close enough, and it
>> was quick and easy. The low silver content solder matches the color
>> perfectly and you have to look very closely to see any fillet after
>> polishing.
>>
>> GWE
> How about friction welding it on???
> ...lew...
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> asked me to make him the part which has a capstan-type bolt head which
> has 4 1/8" rods radially arranged with 1/4" balls on the end. He had
> thought he could bead 1/8" welding rod with a gas flame and get a nice
> ball, but he failed. I just couldn't imagine turning a ball on a 1/8"
> shank without it bending, so I thought for awhile, then took a 1/4" ball
> bearing and some old copper-clad 1/8" welding rod (gas welding) and made
> one. This is how I did it.
>
> I put the 3-jaw chuck on the lathe, and chucked a short piece of the
> 1/8" rod and spun it at high speed and applied some abrasive cloth to
> remove the copper and polish the rod. Then I rechucked it so only about
> 1/4" was sticking out, and took a small center drill in the tailstock
> chuck and made a light centered spot in the end of the rod, just enough
> to get some clearance. Then I took a 1/4" ball end mill and chucked it
> in the tailstock chuck and again at high speed fed it into the rod until
> I had a nice spherical female end. I took a small smooth file and
> cleaned the edges. Then I re-chucked the rod so it stuck out about 1",
> and chucked a piece of 1/8" pipe in the tailstock chuck. I used the pipe
> to center the ball bearing and press it against the rod. I fluxed it
> with white flux and using silver bearing solder (low silver content)
> soldered the ball to the rod. Then I backed off the 1/8" pipe and spun
> the part and polished it. The ball isn't quite dead centered but it's
> way close enough, and it was quick and easy. The low silver content
> solder matches the color perfectly and you have to look very closely to
> see any fillet after polishing.
>
> GWE