Cut Rifling Machine Help

For a bit more context here is a video of an cnc rifling machine made by Bartlien Barrels.

They make excellent barrels blanks!!!!!!

  Bartlein Barrels Rifling Machine - YouTube

 

SPC89 wrote:

Yes it is a cutting process. The tool is removing about 0.0001 every pass it makes. Once it has done a cycle of grooves say 4 it then gets raised by a mechanism that rotates a screw in the tool that pushes on a wedge that raises the cutter up. 
 

The video seems to indicate that the tool is engaged with a separate mechanism that tweaks the screw to add feed.

It would also be possible to have a motor coaxial with the indexing / rotating motor permanently engaged with the adjusting scew. The secret to making that work would be CNC, you would rotate both motors the same amount to index and twist, and then only move one to feed. 

But simply engaging with a fixed "tweaker" isn't a bad solution. 

"The video seems to indicate that the tool is engaged with a separate mechanism that tweaks the screw to add feed"

Correct, we call it the "raiser" but it engages the screw on the Rifling head after a set of grooves been cut and simply turns it a tiny bit to move the cutter up. 

The only problem i can see with having something attached to the cutters raiser screw, permanently following it along the barrel, is that you need to constantly check what depth the rifling groove is with special bore gauges.  You need ease of access to the ends of the barrel for this. On our design you can move the raiser mechanism out the way on a pivot.

So hopefully, you hit pause, the machine moves the cutter to the other end of the barrel out the way, pivot the raiser mechanism out the way, measure what groove depth your at, lower the raiser back down and then hit resume button to carry on until desired depth of cut is achieved.  

 photo below shows our mechanism. 

SPC89 wrote:

The only problem i can see with having something attached to the cutters raiser screw, permanently following it along the barrel, is that you need to constantly check what depth the rifling groove is with special bore gauges. 

I was imagining putting the raising mechanism on the same end as the indexing mechanism, so that the end of the barrel is completely unobstucted when the tool is retracted. 

Hi SPC89, 

Just following up on how you are progressing. I started a similar project about 2 years ago, in-between working two jobs.  I only have a 1/3 prototype machine in test currently.  It would be good to catchup off line to discuss progress / issue etc if you are interested.  

I am curious about your project development. I am planning to build a machine to turn feed screws with an accelerating pitch. I came across this and now I am intrigued.

I wish you well.