Thanks

[bucketboy]

This is a big thank you to the guy who posted a video of him machining a crown using a dremel rather than a tip in the tool post of the lathe.

I had a go today, what do you reckon?

the finish was so smooth I found it difficult to take a photo, 



Thanks again  

Bb

 

[socaloldman]

Wow I could do that. Thanks so much. Nick

 

[mtnGhost]

It's really hard to get the barrel chucked and chamfer perfectly concentric. I've opted against using my mini-lathe unless I'm throating a blank, mainly due to it taking me 3-4 hours to get it all perfect (but I can get it within ~0.0005 or so measuring from the bore).

Regardless, the more important thing is the result. How does it shoot?

 

[Matt247365]

That's what is called "live tooling".

Nice work BB

Matt

 

[bucketboy]

Regardless, the more important thing is the result. How does it shoot?

If I am honest, it seems a bit down on power .....































.............

Bb smile  

 

[mtnGhost]

Whoa, what's that going in?!

 

[far_shot]

I use a ball bearing welded to a 1/4" shaft and spin it on the muzzle with a hand drill and valve grinding paste. The ball bearing centers itself to the bore. The hard part is getting the 1/4" shaft welded straight on the ball so it doesn't wobble.

 

[bucketboy]

I use a ball bearing welded to a 1/4" shaft and spin it on the muzzle with a hand drill and valve grinding paste. The ball bearing centers itself to the bore. The hard part is getting the 1/4" shaft welded straight on the ball so it doesn't wobble.

Yes, I have used that method before and it works really well but the grinding motion is rotational central to the bore, the dremel method cuts at 90degrees away from the bore while the barrel turns slowly in the lathe.

so far, this it the best crown I have managed to do, simple too, all my barrels will be done like this in the future.



Bb

 

[Longun]

Impressive work Pete [thumb up]

 

[bucketboy]

I did another yesterday 

Bb

 

[Michigander]

Looks great, sharp with no burrs, and looks plenty concentric to me. I think any process that has that outcome is going to give good results. I have had good luck with the mandrel type cutters on a .223 that turned out to be the most accurate rifle I have owned. And the simple brass round head screw with lapping compound worked well on a .177 R9. In the latter case, I just faced off the end of the barrel to square it up, then used the screw and lapping compound to form the bare minimum chamfer. The chamfer hit the lands and just barely kissed the grooves. Only a deburring operation really.

 

[Airgun-hobbyist]

That is some good work right there! Necessity is the mother of invention.

 

[Vana2]

Very nice!

I have an 18" piece of heavy walled extruded aluminum that is about 3 " square and has a couple of "channels" on each face that are designed to capture the head of a bolt.

Originally, it was part of the frame for an industrial conveyor system and I am planning to turn it into a live tooling post with vertical adjustment capability for my dremel. Was planning to use it for cutting slots or flats on a round part held in the lathe chuck but it would be great in this application as well!

Thanks for posting!