- Joined
- Feb 2, 2013
- Messages
- 3,627
that's why i don't own any new machine tools in the shop (unless they are old), if i knew what it was like to use a brand new machine tool- i'd probably dump half my junk!
I agree with HolescreekDo a search for "follower rest". Your center section is just pushing away from the tool. How you've done it without a lot of chatter is what I want to know.
Over the months I've been doing 20 inch AR barrels, I had the TS dialed in to the HS, but I never measured the center part of the barrel until recently. Today just to see if what I saw before was repeatable, so I started another barrel for my own consumption for the upcoming match at the end of the month. It looks like the what I saw before is repeatable.
Could this fat in the middle be corrected by machine scrapping? Others suggested to just emery cloth the situation. Well, that is another art on its own. I tried it I could not get the material even the length of it.
The fat in the middle is not a critical dimension, but I would rather get it fixed if fixable. Again, this 1236 is an old Taiwanese lathe, it may very well be something I just need to live it.
The 6J is a set thru that I dial the barrel on the register that I turn during chambering. The barrel is screwed on to a long barrel extension and it is held in place by a copper ring to allow the barrel to pivot.
Thoughts?View attachment 231902 View attachment 231903 View attachment 231904 View attachment 231905
Another vote for a follow rest.
If you dont have a follow you could probably fab something like this without too much trouble. Should work well on ar type barrels.
http://www.frets.com/HomeShopTech/Tooling/MiniFollower/minifollower.html
swamping is thinning in the middle, then flaring back out. it was common on early flintlocks.Thank you.
The good thing about AR15 barrels the contours are all straight and just steps down to another straight dimensions. The shoulders are just chamfered at 45 degrees and not more than 0.020 just to break the edge.
OK, I give up. What do you mean by "put a bit of swamp to it"