Let me do it this way:

Rubicon Prec. said:
24 tpi at 1100 rpm .005” from the shoulder...

https://www.facebook.com/video.php?v=1761201200582562
Click to expand...

I will never understand why you CNC guys think robotics is impressive ?? I mean, that's what it's BUILT FOR ain' it? Isn't that what'cha paid for? My kid runs this huge mill thingie that switches tools, takes 9ft stock and friction stir-welds AL parts faster than the eye can register, but how's that relevant to hunching over a lathe and and calling "pull?"

It's like a bunch of freewallers are discussing summiting times on the East Face, Bodi's Line and you come in telling as how you run the whole wall in 11 seconds...... in the camera chopper.....
 
alinwa said:
And BTW, just for the record...... I use recoil lugs a lot and IMO setting a recoil lug on the threads is criminal.
Click to expand...

Al, I've heard this from other folks too. I'm not sure what the logic is. I run my threads up under the lug with no relief groove and leave about .100 unthreaded. The lug does not really contact the threads and if I set the barrel back later I can pick up the existing threads and not have a groove in the middle.
How do you do the Savage style nuts and not have threads under the lug?
 
alinwa said:
I will never understand why you CNC guys think robotics is impressive ?? I mean, that's what it's BUILT FOR ain' it? Isn't that what'cha paid for? My kid runs this huge mill thingie that switches tools, takes 9ft stock and friction stir-welds AL parts faster than the eye can register, but how's that relevant to hunching over a lathe and and calling "pull?"

It's like a bunch of freewallers are discussing summiting times on the East Face, Bodi's Line and you come in telling as how you run the whole wall in 11 seconds...... in the camera chopper.....
Click to expand...

A similiar analogy can be stated concerning a Rail Gun.

I will be at the range doing some serious testing, and invariably someone will come over and take a look. They marvel at the accuracy, often 10 shots in less than .200.

I tell them that if I won't do that, it's not much more than a 75 pound door stop.
 
A friend has a Hardinge Chucker

It has that threading mechanism on it that automatically pulls the tool and re-sets to cut again, all automatically without thread relief or anything For someone doing a lot of barrels, that rig would be worf it's weight in the most expensive stuff one could think of; of course CNC machines do the same thing but an old Chucker likely wouldn't be as spendy. I know they only have about an inch spindle bore but, just imagine, perfect thread in the snap of a finger. Of course, on a good day, doesn't take me very long to thread a tenon either. I just thought that old Chucker was a marvel. Beautiful threads too!.

Pete
 
alinwa said:
I will never understand why you CNC guys think robotics is impressive ?? I mean, that's what it's BUILT FOR ain' it? Isn't that what'cha paid for? My kid runs this huge mill thingie that switches tools, takes 9ft stock and friction stir-welds AL parts faster than the eye can register, but how's that relevant to hunching over a lathe and and calling "pull?"

It's like a bunch of freewallers are discussing summiting times on the East Face, Bodi's Line and you come in telling as how you run the whole wall in 11 seconds...... in the camera chopper.....
Click to expand...

No matter how many barrels I've fit or parts I've made, I still enjoy watching it. It still impresses me. It was just a fun post.
 
Rubicon Prec. said:
No matter how many barrels I've fit or parts I've made, I still enjoy watching it. It still impresses me. It was just a fun post.
Click to expand...

OK.... THAT I'll agree with ;)

Bravo.


Cool is cool...... fun is fun....... can't take that away




PLUS.... I growed up POOR, I've worked hard, I still get a kick out of buying a pair of shoes.... so Good On Ya!!!

Be Proud
 
SGS said:
Al, I've heard this from other folks too. I'm not sure what the logic is. I run my threads up under the lug with no relief groove and leave about .100 unthreaded. The lug does not really contact the threads and if I set the barrel back later I can pick up the existing threads and not have a groove in the middle.
How do you do the Savage style nuts and not have threads under the lug?
Click to expand...


OK..... this will be total al-ness so those that are disturbed by that, move on, nothing to see here :)

just another mis-guided opinion from some hackyard backer.



I have only one goal in a gun, consistent accuracy. Aggability. Aggability first, SMALL aggability best.

NOTHING else matters to me.

From this perspective I ask these questions;
-what is the lug FOR?
-what does the lug DO?
-HOW does it do what it does?
-How does the system react TO the lug?
-What can be the lug's effect on accuracy, if any?
-etc, etc...

And my personal (tested) belief is that the lug hugely affects accuracy. Generally adversely. In fact, I believe the Kelbly (Stolle) Panda was designed-built SPECIFICALLY to eliminate some of these deleterious lug effects. And to this day you'd be hard-pressed to improve on a glued-in Panda.


But not all bears can be Pandas, soooo

I use 14 different configurations/iterations of recoil lugs, Several are custom grinds (PTG will make anything for a price)

I rarely use a lug without modification, and I soi'tanly don't just drop 'em down the pole and let 'em rattle on the shank. My lugs are fitted. AND (You really aren't going to believe this) In my barrel nut experiments I've even gone so far as to pull out and back in leaving a high-spot, specifically to make it easier to pick up the threads again for setback. I've also simply done two sets of threads with a land between.

I DO NOT do that nowadays..... in fact I've had some lugs made that are 1/2" thick, under-sized in diameter and set tightly on top of my flat-topped threads.

I'm not advocating. recommending, pushing, selling anything nor trying to convince anyone of ANY thing. Just stating that IMO the lug has a huge job to do.

It also dramatically weakens the stock at a critical flex-point so I've been experimenting with stiffening THAT beam for 15yrs.....

but I digress


so I'll shut up now :)
 
Rubicon Prec. said:
No matter how many barrels I've fit or parts I've made, I still enjoy watching it. It still impresses me. It was just a fun post.
Click to expand...

Rubicon,

OK...I'll buy that. But how do you possibly explain the New Kids on the Block song playing in the background?!

:cool:

Justin
 
I thread to the shoulder with an 18 pitch thread at 250 rpm with no relief groove. However, the term “to the shoulder” is relative. As long as the thread ends in the relief area of the receiver that’s good enough for me and is what I consider “to the shoulder”. Maybe it gives a little better surface finish threading faster, but I’m a lot like Al in that too slow a speed makes me think I need a cup of coffee. The best thing that you can do to increase your threading speed is to thread lots of barrels. Nothing beats experience.
 
Pete Wass said:
It has that threading mechanism on it that automatically pulls the tool and re-sets to cut again, all automatically without thread relief or anything For someone doing a lot of barrels, that rig would be worf it's weight in the most expensive stuff one could think of; of course CNC machines do the same thing but an old Chucker likely wouldn't be as spendy. I know they only have about an inch spindle bore but, just imagine, perfect thread in the snap of a finger. Of course, on a good day, doesn't take me very long to thread a tenon either. I just thought that old Chucker was a marvel. Beautiful threads too!.

Pete
Click to expand...

I know at least one guy that fits barrels with a Hardinge Toolroom Lathe. They use a smallish 4 jaw chuck and the spindle bore is reported to be 1.250. That may not apply to all of them. They were in the neighborhood of 50-60 Grand when Hardinge last made them. About half that for the currently available Taiwanese clones.

I do want one someday.
 
Rubicon Prec. said:
Similar to a set-true.
Click to expand...
I sure wish there was a market for an inside bore-alignment feedback loop for CNC....... If I could throw a barrel shank onto a collet, stick an indicator in to run a specified 2" section of the first 5" and watch the mo'chine wiggle-waggle into alignment then spin up.....

I'd prolly mortgage the ranch and go buy one!
 
alinwa said:
I sure wish there was a market for an inside bore-alignment feedback loop for CNC....... If I could throw a barrel shank onto a collet, stick an indicator in to run a specified 2" section of the first 5" and watch the mo'chine wiggle-waggle into alignment then spin up.....

I'd prolly mortgage the ranch and go buy one!
Click to expand...

I would like to see a video of the truing procedure as well.
 
alinwa said:
I sure wish there was a market for an inside bore-alignment feedback loop for CNC....... If I could throw a barrel shank onto a collet, stick an indicator in to run a specified 2" section of the first 5" and watch the mo'chine wiggle-waggle into alignment then spin up.....

I'd prolly mortgage the ranch and go buy one!
Click to expand...

The way some people are getting creative with probing macros on VMCs, it wouldn't surprise me if we see something similar in the future.


This is the chamber end before any machining begins The DTI is reading just ahead of the throat, where the pilot busing will end up. This is also held directly in a collet.

https://www.facebook.com/video.php?v=1453332464702772
 
Collets are nice

Having a setup with a set true feature would be nice as well but likely out of my budget. Im gonna fit the Spider I bought to a face plate when I get hme and see how that goes.

Pete
 
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