Yes, it can be legal to make a silencer. For everything Form-1, from silencer designs that are easily made, to filing forms with the BATF, to 3D modeling. Remember, you must have an approved BATF Form-1 to make a silencer. All NFA laws apply.
...I used a die grinder and diamond bit for the clipping....
What did you buy that mill for again?
Well I have an ar15 lower indicated in it and didn't want to move it. Also the inconel was such a pain, I didn't want to ruin an end mill for a tiny clip......so since I was going to grind the inconel I just did the other two.
Jim from your YouTube comments here, thanks for reminding me to come over here.
Great build! Any lessons learned from turning Inconel? How was it compared to the 6al-4v? I'm pretty comfortable with 6al-4v now it seems that as long as you take your time I find that it works pretty easily.
What is your weight difference between the aluminum baffle and the titanium baffle? I always chuckle a little when folks say something along the line of "of course you get a weight savings with titanium over aluminum".
Again, great job. I'm amazed at how well 3 baffles worked.
-Jim
My Form 1 Monocore build on YouTube:
http://www.youtube.com/playlist?list=PLH37sv2ySHmB1tTivFYIF8y2CW8rmiZRi
kingjamez wrote:Jim from your YouTube comments here, thanks for reminding me to come over here.
Great build! Any lessons learned from turning Inconel? How was it compared to the 6al-4v? I'm pretty comfortable with 6al-4v now it seems that as long as you take your time I find that it works pretty easily.
What is your weight difference between the aluminum baffle and the titanium baffle? I always chuckle a little when folks say something along the line of "of course you get a weight savings with titanium over aluminum".
Again, great job. I'm amazed at how well 3 baffles worked.
-Jim
Thanks Jim.
Inconel 718 is the toughest stuff I've ever carved! Turning it wasn't so terribly bad, slow speeds, flood coolant, and deepish cuts, were the winning combination. But parting it off became an exercise in patience!
By comparison the 6al4v is a cakewalk.
I didn't weigh the baffles individually, but I'd hawk a guess that the titanium and tennalum are similar in weight. I made the aluminum baffle thicker.
If you're the same Jim who milled out that titanium lower from scratch, then I've watched all those vids, and am very impressed with your skills! Bravo!
Inconel 718 is the toughest stuff I've ever carved! Turning it wasn't so terribly bad, slow speeds, flood coolant, and deepish cuts, were the winning combination. But parting it off became an exercise in patience!
By comparison the 6al4v is a cakewalk.
I didn't weigh the baffles individually, but I'd hawk a guess that the titanium and tennalum are similar in weight. I made the aluminum baffle thicker.
If you're the same Jim who milled out that titanium lower from scratch, then I've watched all those vids, and am very impressed with your skills! Bravo!
Yep, that's me. The Ti lower ended up being a lot heavier than I expected... I should have known since Ti is 1.7x the weight of aluminum for the same unit volume.
Where did you get your Inconel? I'm having a hard time finding a good source, I'd like to give it a go now that you've inspired me!
-Jim
My Form 1 Monocore build on YouTube:
http://www.youtube.com/playlist?list=PLH37sv2ySHmB1tTivFYIF8y2CW8rmiZRi
Inconel sucks! We had a bunch of test parts to gundrill in a new machine we were building at work.....I was the lucky one that had to part off and face them to he right length. Think they were 1" diameter and I was getting about 1.5 parted off per insert.
Did you grind off the slag on your baffle before going back on the lathe? That looks like a nightmare to clean up.
Are there any new small quantity sources out there for the 7068? Last time I checked it was just Amazon that I could find.
The myopic majority will be our republic's undoing.
So do you put the baffle in a fixture to machine the "inside" I'd like to see pics of you setup for doing the other side of the baffle. Or do you just re indicate it in once you do the front. My can design has 11 baffle for .308 seems like I may reduce that a bit..
joe0121 wrote:So do you put the baffle in a fixture to machine the "inside" I'd like to see pics of you setup for doing the other side of the baffle. Or do you just re indicate it in once you do the front. My can design has 11 baffle for .308 seems like I may reduce that a bit..
I machine the bore thru hole, the outer diameter, the cone angle, and both front and rear faces before I part the baffle off.
It's important for the rear face, and the front face to be parellel and square.
When I flip it and put it in the chuck to do the internal carving, I use the ball bearing wobble elimination method to get everything turning true before I start carving. I know it's not perfect, but it's very very close. AND, being that the internal dimensions are not critical dimensions, I've never had a problem. Everything that matters can be cut while the stock is mounted up to begin with.
joe0121 wrote:So do you put the baffle in a fixture to machine the "inside" I'd like to see pics of you setup for doing the other side of the baffle. Or do you just re indicate it in once you do the front. My can design has 11 baffle for .308 seems like I may reduce that a bit..
I machine the bore thru hole, the outer diameter, the cone angle, and both front and rear faces before I part the baffle off.
It's important for the rear face, and the front face to be parellel and square.
When I flip it and put it in the chuck to do the internal carving, I use the ball bearing wobble elimination method to get everything turning true before I start carving. I know it's not perfect, but it's very very close. AND, being that the internal dimensions are not critical dimensions, I've never had a problem. Everything that matters can be cut while the stock is mounted up to begin with.
Ok I *was* going to try to machine it all in one shot but I just dont think it's gonna work out. I bought a bunch of delrin to try out a few methods before I start cutting expensive metal.
I know of no way to machine an entire baffle on the lathe without turning it around....on second thought, there is a way, but it's not a very good way. You'd end up holding it by just the tip. and having to drill a deep hole that my wander off center....a lot of variables could be introduced into this discussion.
My order of ops,
Turn OD, face, drill bore hole, cut outer cone (with included step at the widest), part.
On parting.....I make sure before the parting cut gets too deep to cut an "inside face" (think top of the funnel) so when I flip it I have a true surface to ride the bearing on.
Dr.K wrote:Make some powder funnels, great practice!
I know of no way to machine an entire baffle on the lathe without turning it around....on second thought, there is a way, but it's not a very good way. You'd end up holding it by just the tip. and having to drill a deep hole that my wander off center....a lot of variables could be introduced into this discussion.
My order of ops,
Turn OD, face, drill bore hole, cut outer cone (with included step at the widest), part.
On parting.....I make sure before the parting cut gets too deep to cut an "inside face" (think top of the funnel) so when I flip it I have a true surface to ride the bearing on.
Is this making sense?
Makes perfect sense. My south bend came with a six jaw chuck so if I wanted to be anal I could dial it in really close. What do those little notches people put on the front of the cone do? I am thinking I will start with six baffled with a 1.5 inch blast baffel than .850 and getting long as it goes towards the end of the can.
Dr.K wrote:So, this project is at the point of two titanium end caps grade 5, and a grade 9 tube. That's done already, but now my curiosity is bubbling about using some different materials in my schemes. Here's what direction I'm taking this.
I ordered a stick of tennalum or 7068 if you prefer, and also a chunk of 718 inconel,
I'm going to make a blast baffle with the inco 718, and then a couple of 7068 cones after that. I'll be using grade 9 Ti for the spacers.
No worries, I'll document my project with plenty of photos and details. I still may throw in a titanium baffle just because I've never made one, and want to give it a try.
Kyle,
Great build, pictures look great. love the bleu anodize as well.
What barrel length do you run this on?
What wall did you use an the Gr9 spacers?
For hunting sometimes Less is more.
Weight can be a huge drawback on those long walks and stalks.
