Butch Lambert
Active member
How does that compensate for temp?
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A question
- Thread starter Jim Kobe
- Start date
How does that compensate for temp?
Butch Lambert
Active member
It allows the reamer to stay in aligned with the hole I prebored even if the tail stock isn’t. It also takes even torque on both sides of the reamer eliminating the reamer wanting climb like it does when the torque is taken on one side only.
A lot of us have chambered for many years and understand what you are trying to do. How about this temp that enlarges the base?
Butch Lambert
Active member
that issue chambering a bbl. All I can say if you have to run the lathe that long to cut a chamber your taking waaaaaay to long to chamber. I indicate after pre-boring, after that it takes about 5 min with the reamer. The temp thing is a non issue.
Richard
Yup!
0.00000645in/in/deg F.
Do the math.
It works at large temperature differences or swings.
Large guns have been assembled by heating the outer layer, cooling the inner in liquid gases (like nitrogen), than forcing them together.
This produce a large preload on the inner member.
Thousands of PSI of compression.
That means when the gun us fired their is NO ring loading on the barrel material until the preload from the outer layers is exceeded.
If you had a 100,000 PSI preload from the outer layers a chamber pressure of 100,000 PSI is ZERO load on the inner portion.
You can safely exceed the Young's modulus of the inner layers thanks to the preload from the outer layers.
Do the math.
It works at large temperature differences or swings.
Large guns have been assembled by heating the outer layer, cooling the inner in liquid gases (like nitrogen), than forcing them together.
This produce a large preload on the inner member.
Thousands of PSI of compression.
That means when the gun us fired their is NO ring loading on the barrel material until the preload from the outer layers is exceeded.
If you had a 100,000 PSI preload from the outer layers a chamber pressure of 100,000 PSI is ZERO load on the inner portion.
You can safely exceed the Young's modulus of the inner layers thanks to the preload from the outer layers.
B
BG Gunworks
Guest
I'm having trouble with the idea of repeatability using a boring head as an adjustable center.
How can you be assured the axis of adjustment is perfectly aligned (axially or radially depending on how you're using it) to that axis, without indicators- remove and replace it repeatedly, and have it be within a few tenths? Guess I'm wrong, but I didn't see that happening .
How can you be assured the axis of adjustment is perfectly aligned (axially or radially depending on how you're using it) to that axis, without indicators- remove and replace it repeatedly, and have it be within a few tenths? Guess I'm wrong, but I didn't see that happening .
Rubicon Prec.
New member
I'm having trouble with the idea of repeatability using a boring head as an adjustable center.
How can you be assured the axis of adjustment is perfectly aligned (axially or radially depending on how you're using it) to that axis, without indicators- remove and replace it repeatedly, and have it be within a few tenths? Guess I'm wrong, but I didn't see that happening .
I'd guess if you marked the clocking of it and ensured it went back in the same way each time, I'd guess it'd be as repeatable as a dead center is. I'm not sure how many people sweep in their dead centers each time they are re-installed. I don't even use a tailstock so I can't really say.