barrel relining service?

hayhugh · 10-27-2019, 05:47 AM

On ships I have worked on they heat the shaft bearing so that it expands then press force the shaft into the bearing. When the bearing cools they are as one!

calibrator · 10-27-2019, 09:47 AM

.0015-.002" is a LOT of clearance. You need the liner and barrel to have at least a slight press fit for heat transfer and stability. I'd forego the Loctite. Even the high temp version will liquify with enough heat. The liner creeping over time could be an issue. A step at the muzzle end would be ideal depending on how it's formed.

I'd shoot for a .0005" (maybe even slightly less) press fit. Heat the barrel and cool the liner with nitrogen or dry ice. Get a decent chamfer on the leading edges of both mating parts.

I'd be choosing the 1:7 twist.

I recall when the C96 Forum used to on-line, and seeing some pics of barrels re-lined by the Broom Closet. The liners were definitely off-center when viewed from the muzzle. Many complaints about wildly off-axis round impacts as I recall.

Go with the sheepherder, he's got the knowledge from actual experience. I'm trying to relate my experience with making valve guides for racing engines.

Good Luck ! Your mileage may vary !

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

10-27-2019, 05:47 AM	#1
hayhugh User Join Date: Oct 2013 Location: Florida/Penna Posts: 898 Thanks: 893 Thanked 514 Times in 276 Posts	On ships I have worked on they heat the shaft bearing so that it expands then press force the shaft into the bearing. When the bearing cools they are as one!

10-27-2019, 09:47 AM	#2
calibrator User Join Date: Feb 2009 Location: Cave Creek Posts: 340 Thanks: 67 Thanked 272 Times in 109 Posts	.0015-.002" is a LOT of clearance. You need the liner and barrel to have at least a slight press fit for heat transfer and stability. I'd forego the Loctite. Even the high temp version will liquify with enough heat. The liner creeping over time could be an issue. A step at the muzzle end would be ideal depending on how it's formed. I'd shoot for a .0005" (maybe even slightly less) press fit. Heat the barrel and cool the liner with nitrogen or dry ice. Get a decent chamfer on the leading edges of both mating parts. I'd be choosing the 1:7 twist. I recall when the C96 Forum used to on-line, and seeing some pics of barrels re-lined by the Broom Closet. The liners were definitely off-center when viewed from the muzzle. Many complaints about wildly off-axis round impacts as I recall. Go with the sheepherder, he's got the knowledge from actual experience. I'm trying to relate my experience with making valve guides for racing engines. Good Luck ! Your mileage may vary !