internal spindle bushing material ???

One approach

Hal

Here is one approach. The unit is spring loaded. The barrel has a 45 degree chamfer cut while the barrel is between centers so that the 45 rides in the 45 of the cone.

Barrel_fixture_2.jpg

Barrel_fixture.jpg


Spindle has been reamed
The large unit that holds the spring plunger fits spindle bore snugly as does the reverse cone unit


I do not like the range rod method. I much prefer to have a bore that is concentric to the spindle centerline so that when barrels are installed --you can go from barrel to barrel and be approximately sighted in.

Jim
 
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Jim
Great idea thanks for posting the pictures. What type of reamer did you use to ream the spindle?

Hal
 
Hal

The reamer was custom made and if I had more thoroughly checked my spindle--I think it would not have actually needed it. The Harrison spindle internals run true and have a good finish. My Victor was another story.

One way to check it is to make 2 aluminum bushings with an o ring mounted on each one and then mount the al rings on a long piece of drill rod and insert the unit in spindle and check run out of the drill rod--that will give an approximation of how true the spindle is over it's length.

Jim
 
Jim,My Harrison has a true spindle bore also,I have a steel tube that slides into the spindle bore snug,It also has 3 O rings on it,I have a Hardened dead 60 degree center that slides into the tube,there are 4 different lenght springs that can be put behind the center to hold tension against the dead center ,that goes into the center of the rifle barrel,i use this set up for shorter barrels,it allows for perfect alignment every time.The tube is held tight by a set screw on the outboard end of the lathe spindle. BILL
 
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