He means 0.00015 inch per cut. That is shallow.

@@rickoshea8138 exactly. normally that would just cause rubbing

You made your own barrel? Was it a rifle barrel or a handgun barrel? And can you tell me more how you did that? I'm always intrigued by this because to me barrel making has always seemed like 50% skill and science, and 50% dark magic. How to accurately drill such a long hole without veering off course, and after that the reaming and de-stressing the drilled blank. Then of course the most difficult part, the actual rifling of the barrel itself, followed by lapping and a final de-stressing before its a usable and rifled barrel blank, ready to be turned to it's final dimensions.

It's still a bad practice. A bump of a key and the chuck tension might change. If a company isn't doing 100% to remove the possibility of any error, then they shouldn't use the word precision.

99% of the rifle process is done without the hands of the operator touching the machine. It is setup and run and checked for specs at the end and then removed from the machine. Very little chance of the chuck key being moved......but I do understand your OCD point of always removing it.

@@arrowandrew2613 and like I said I completely understand each shop will have there own processes and even understand the reason they leave the key in the chuck but it just looks weird and feels uncomfortable to see a machine operating with the key left in the chuck.

Me too, I literally FLINCH the second I see it. As an apprentice, I once saw someone "accidentally" start up with the chuck key in it, and still remember the frigging solid THUMP as it flew across the shop and took a lump out of the wall

It's so you can push it harder at the beginning without as much pressure and then spin it up to the desired twist at the end of the barrel. It gives you some velocity.

a clean shop is a very special thing for sure.

im a machinist and i noticed the same thing...i work in a aerospace shop that is way dirtier and run down....0 maintenance its just so stupid i laugh every time something breaks.... the owner comes from a lot of money and doesnt take care of his toys......this shop looks very professional and nice modern machines....im getting one of those gain twist barrels

.0027" so 2 thousands and 7 tenths of a thou left to cut you fucking mongoloid

He said," 2 thousandths and 7 tenths (meaning 7 tenths of a thousandth) .0027" Easily misunderstood if you never worked in a machine shop. ;)

They worked at Krieger. They left and started Bartlein

No it is subtle, it does not bind anything up, it's not like it lays over itself

They can't even be bothered to answer questions. This company is terible, get your barrel from some that actually wants to sell to the public. These clowns only want to deal with the government or professionals. If you are just a regular person trying to upgrade forget about it. You are not worthy of their time. Just look at the posts. They didn't respond to 1. Buyer beware with this company.

ah welcome to the world of machining lol. After you get the groove started the tool will want to follow it after each pass though, same reason you use a spot drill to keep a long drill from walking off center.

Where are your “” I’ll stop now. It was in good fun. Light hearted not meant to offend

Lol tell that to the scores

These guys have it figured out

In this operation the chucks are used as holding devices only. They do not spin during the rifling procedure. The precision and accuracy of the rifling operation has nothing to do with the run out of these chucks.

in barrel manufacturing.... you order a rifled blank... the bore and rifling are true to each other... but not necessarily the blank... the blank is a cylinder of steel... the bore cut in that cylinder and rifeling put in to the bore are cut true to each other... but not necessarily true to the outside of the original cylinder... the outside is considered expendable material when a gun smith receives the rifled blank... he must cut off the end of the blank where the tooling entered the bore... and use his tools to align the rifled bore true to his lathe.. and then cut the outside of the blank true to bore...a very highly skilled gunsmith can do all operations from finish contouring, threading, chambering, crowning and installing muzzle breaks and much more very very accurately and with machining techniques that do not introduce stresses that may harm the harmonics of the barrel as it whips in use. a proper barreling job also involves timing and head-spacing; and can require modifications to the bolt face, extractor and other components including the stock of course.. Gunsmiths biggest pay seems to be the honor of being the town gunsmith... and of course being close to the industry and people who remind of some of those better parts of life; that said... if you can...please take care of a good gunsmith if you find one... don't be cheap on him and compare what he does to what you can buy off of a shelf for a few hundred bucks. Some get into additional heat treatment and stress relief after all is said and done.. .which should not be necessary...if all was carefully machined in normal circumstances... some though... as you know get ultra high tech... far beyond my pay grade. is a good question... you must be a machinist

3 jaw chucks are self centering, less setup time than 4 jaw, and also why would you use a 4 jaw if every workpiece is going to be round?

Ammunition test barrels can have a very large outside breech diameter. Some as large as 2.5"

the cutting tool is self guiding, the chuck concentricity has no effect on it. Much like honing.