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  #41  
Old 01-13-2014, 8:14 PM
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Originally Posted by Syds Grandpa View Post
Indexing head! I've heard shop teachers call the "Dividing heads" before, nobody in the trade calls them that. You are a very talented individual. We should talk sometime.
Indexing heads index certain degrees ..dividing heads made for gear cutting
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  #42  
Old 01-13-2014, 8:30 PM
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WOW! Nice work! If I had the tools and knowledge I'd be making my own stuff just out of pure joy..
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  #43  
Old 01-13-2014, 9:17 PM
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Originally Posted by Reelemup View Post
Indexing heads index certain degrees ..dividing heads made for gear cutting

Exactly. Not a lot of gears on that hand guard.
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  #44  
Old 01-14-2014, 4:49 AM
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Originally Posted by Syds Grandpa View Post
Exactly. Not a lot of gears on that hand guard.
No what we're saying is there are two completely different tools. And he may have had to use a dividing head. Your post made it sound like they were one and the same. Yes he could have and probably should have used a indexing head just to be quick about the lay out
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  #45  
Old 01-14-2014, 5:32 AM
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Nice work!!!
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  #46  
Old 01-14-2014, 7:54 AM
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Here is a picture of the setup. The TA's in the shop referred to the device as a dividing head. I've watched videos on youtube where they did use it for gear cutting. It is 40 turns of the handle for one revolution of the work piece.

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  #47  
Old 01-14-2014, 10:44 AM
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I have a quick question for you experienced machinists, what kind of heat treatment and finish/coating would you recommend for the 4140 barrel nut?
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  #48  
Old 01-14-2014, 1:37 PM
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I'm not an experienced machinist but I don't see a reason to heat treat a barrel nut. I'd park it. Or if you care then use 4140 prehard and park that.
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  #49  
Old 01-16-2014, 5:34 PM
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Will heat treating/parkerizing change the size enough to create a fit issue?
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  #50  
Old 01-16-2014, 7:22 PM
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There is a tiny bit of slop before I tightened the mounting screws, so I think it will be okay. If not, I will lightly sand out the inside of the handguard until it fits over the nut.
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  #51  
Old 01-17-2014, 5:31 AM
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It only needs to be mildly heat treated if at all. Just enough to keep the wrench from putting ding marks in it. If you were to send it out id spec 35Rc max
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  #52  
Old 01-31-2014, 4:49 PM
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Default All finished

Well, I finally got the nut back from the gun store doing the parkerizing. Both finishes came out extremely well. I thought I was going to have to do some light sanding to make both the pieces fit together again, but they just fit extremely snugly now.

I got anxious and threw it together without taking any pictures of the finished parts by themselves. However, there were some moderate annoyances when putting the upper together.

1) The barrel nut hand tightened perfectly in alignment, so I had to torque it all the way to the next tooth. I was extremely close to the 80 lb-ft limit when the nut lined up properly. This is the second upper I've had that happen with. I like it when they hand tighten half on a tooth and you only have to torque it like 45 lb-ft to get it straight.

2) I don't know what changed between now and before I had the parts finished, but the screw holes and sleeve holes did not want to line up perfectly together. I would put one screw in and then the next one would be lined up with the hole enough to be able to catch the threads. I was finally able to just barely start each screw and then tighten them all a little at a time to make them go in, but the fifth one still felt like if was rubbing on the edge of the hole from the handguard while screwing down into the nut.

Anyways, it is as done as it can be and it's holding on rock solid. I just have the aimpoint on there from one of my other rifles until I get around to buying a Bushnell 1-4x BTR PCL. I've heard they are a great 1-4x scope for the money with a few 3-gun specific features built in (folding cat tail especially).





Let me know what you think, and thanks again for all your input!

Jon
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  #53  
Old 01-31-2014, 5:00 PM
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The finished product looks awesome!! Nice job Jon!!

How was the tube finished? The parkerizing should not have affected the barrel nut.
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  #54  
Old 01-31-2014, 5:07 PM
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That is bad*****!!!!!
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  #55  
Old 01-31-2014, 5:15 PM
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Originally Posted by Sticky View Post
The finished product looks awesome!! Nice job Jon!!

How was the tube finished? The parkerizing should not have affected the barrel nut.
Thanks guys, the tube was type 3 hard coat anodized. I barely drilled the holes in the tube big enough to allow the screws through when it was raw. Then the anodizing probably added a couple thousandths of an inch to the surface. That probably made the barely big enough holes a little on the too tight side is my guess. If I try this again in the future I'll drill them a size up.
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  #56  
Old 01-31-2014, 5:18 PM
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Nice!
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  #57  
Old 01-31-2014, 5:49 PM
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Nice work , I am a Toolmaker at Wirecut corp . This has inspired me.
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  #58  
Old 01-31-2014, 6:57 PM
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cool have you ever tommygun finned a barrel?
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  #59  
Old 01-31-2014, 10:15 PM
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Quote:
Originally Posted by $P-Ritch$ View Post
Thanks again, the mill had a DRO, but the lathe I used was all dials.

toddh, I did not have the tooling to thread on the lathe, instead I bought a 1 1/4" - 18tpi tap from brownells and used the dead center to help cut the threads. None of the tap handles in the shop could fit that monster.

whoa, dude.... you'll get canned from some machine shops for parking your carriage under the chuck. Bad, bad practice. Your instructor should have warned against this. Just one of those unlikely fails, but if it really happens, the machine is generally dead.

That said, nice work.

Last edited by CRTguns; 01-31-2014 at 10:18 PM..
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  #60  
Old 01-31-2014, 10:16 PM
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Originally Posted by bohoki View Post
cool have you ever tommygun finned a barrel?
it was originally done by the japs or the swiss. It's not hard to do, just a waste of time.
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  #61  
Old 02-01-2014, 12:41 PM
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Quote:
Originally Posted by CRTguns View Post
whoa, dude.... you'll get canned from some machine shops for parking your carriage under the chuck. Bad, bad practice. Your instructor should have warned against this. Just one of those unlikely fails, but if it really happens, the machine is generally dead.

That said, nice work.
They never mentioned that to us, but it totally makes sense and is obvious the kind of damage it could do to the machine. Thanks for the heads up! Always learning more about how little I know...
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