When I worked on race cars years ago a process was being used to polish ports and passages by forcing a gel like media with gritt in it through at high pressure. The passage was deburreded and polished with minimal metal removal depending on gritt and other factors. Has anyone ever seen this used on a barrel to deburr and pollish rifling. Just wondering??
Extrusion hone
- Thread starter rcparker1
- Start date
"Extrude hone" namebrand. I remember that!
Dusty Stevens
Shiner
Check out a vapor hone. Maybe that can work and a lit of anodizing type companies can do that
If I'm not mistaken, that process was/is used on racing engines because actual port blending and polishing is not allowed in some classes. It was a way of cheating, just a little bit but not all the way. Lol!
Hey, if you don't get caught it ain't cheating in racing
Toolbreaker
Gold $$ Contributor
Kinda like acid porting in the stock classes with iron heads & intakes?...or so I'm told
. Although I personally never used Extrude Hone, I have seen the results inside an aluminum intake (Victor Jr.). It was impressive.Yes. I spent a few years in an automotive machine shop. We didn't have that machine and sent those out, so I never actually saw it done in person, but we had a good shop and built some motors for some pretty well known racing teams. Extrusion honing was popular in the stock and super stock drag racing circuit where rules were very strictly enforced. One of the racers was Dickie Ogles. He had a 427 Camaro Super stock stick car that was a bad dude. Not much can compare to a big block chevy, dumping the clutch at 9,600rpm. That's been years ago, so that might seem like child's play today but it was pretty much unheard of at the time.Kinda like acid porting in the stock classes with iron heads & intakes?...or so I'm told
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When I worked for a Diesel Engine Manufacturer I took a few cylinder heads to Extrude Hone. Great people to work with, like most of the folks I worked with in Western PA.. Not sure it would work in a rifle barrel, it removes all material, not just burrs. Small displacement engines saw the biggest gains.
Great thought, if you don't ask you won't know.
Great thought, if you don't ask you won't know.
The extrude honing I saw was very obvious. If it was illegal in your class and you had to do a tear down, you would get caught.
A friend of mine burns the cotton off a bore mop, uses what is left to cast a lead bore lap, then he laps his bore with diamond paste.
You could do that or a barrel break-in procedure to smooth out your rifling.
A friend of mine burns the cotton off a bore mop, uses what is left to cast a lead bore lap, then he laps his bore with diamond paste.
You could do that or a barrel break-in procedure to smooth out your rifling.
DaveTooley
Gold $$ Contributor
Easier solution is buy a good barrel to start with.
Dusty Stevens
Shiner
Aint that the truth
DaveTooley
Gold $$ Contributor
Blackstar used an electro-chemical process. They put a taper in the bore. There are companies using the extrusion hone on barrels. None that would be considered top shelf match grade barrels.
You don't want a barrel to smooth. More friction and fouling. When I'm polishing a barrel to a bright finish I can feel a difference in resistance between the highly polished areas and the areas that need more polishing. I don't have to stop the lathe for inspection.
You don't want a barrel to smooth. More friction and fouling. When I'm polishing a barrel to a bright finish I can feel a difference in resistance between the highly polished areas and the areas that need more polishing. I don't have to stop the lathe for inspection.
butchlambert
Site $$ Sponsor
DaveTooley
Gold $$ Contributor
I had a few customers that liked them. That's when I found Moly-D because they were Lothar Walther barrels. Tough steel.
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