Another Nielsen/LID

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.

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propeine
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Another Nielsen/LID

Post by propeine » Sat Dec 03, 2016 9:00 pm

Quite a while ago I completed my 9mm form 1. Thread is in the forum somewhere. It had a griffin taper mount rear cap because well it seemed like a good idea at the time. I haven't shot it much because it needed a booster. So I made a booster!


True value had a huge selection of springs. Still wound up with basically what I intended and it works! Spring is 1.5in long. Preload of .4in. .080 diam wire and .875 OD

No drawings on this one just seat of the pants and napkin sketches.

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T-Rex
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Re: Another Nielsen/LID

Post by T-Rex » Sun Dec 04, 2016 10:40 am

Nice work.
Why didn't you allow the gas to use the space inside of the booster?
Pic of inside the taper-mount adapter?
What tolerance did you use between piston OD and taper-mount adapter?
Any blowback?
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propeine
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Re: Another Nielsen/LID

Post by propeine » Sun Dec 04, 2016 1:58 pm

T-Rex wrote:Nice work.
Why didn't you allow the gas to use the space inside of the booster?
Pic of inside the taper-mount adapter?
What tolerance did you use between piston OD and taper-mount adapter?
Any blowback?
I kept it sealed at the moment mostly due to crud. And the minimal expansion volume I don't think will make enough difference to make the crud in the spring area worth it.

What pics would you like? I'm happy to take more.

.003 tolerance. .626 bore and .623 piston. I imagine if I ran a whole lot of ammo through it in a hurry it might seize being that tight.

Only function tested yesterday. Doesn't seem to be too bad from a blowback standpoint. I'll video when I can get to the range rather than test firing in the garage.

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Capt. Link.
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Re: Another Nielsen/LID

Post by Capt. Link. » Sun Dec 04, 2016 2:20 pm

NICE!
-CL
DD progress?
The only reason after 243 years the government now wants to disarm you is they intend to do something you would shoot them for!

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T-Rex
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Re: Another Nielsen/LID

Post by T-Rex » Sun Dec 04, 2016 8:27 pm

Capt. Link. wrote:NICE!
-CL
DD progress?
Yeah, no sh*t.
I have that page bookmarked.
Thanks for bringing it up Capt.
Completed Builds www.silencertalk.com/forum/viewtopic.php?t=79895
Burst Calculator www.engineersedge.com/calculators/pipe_bust_calc.htm
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propeine
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Re: Another Nielsen/LID

Post by propeine » Sun Dec 04, 2016 9:12 pm

T-Rex wrote:
Capt. Link. wrote:NICE!
-CL
DD progress?
Yeah, no sh*t.
I have that page bookmarked.
Thanks for bringing it up Capt.
I'll post some pics of progress. Finances have slowed progress heavily. Even doing it yourself mortars are spendy...

JulietDeltaCustoms
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Re: Another Nielsen/LID

Post by JulietDeltaCustoms » Mon Dec 05, 2016 3:52 am

Nice work! I think the form1 community would certainly benefit from a diy booster! Any way we can get you to draw up a sketch?
www.julietdeltacustoms.com

Juliet Delta Customs - Custom built solvent traps, cups, direct thread mounts, and much more.

[email protected] or [email protected]

propeine
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Re: Another Nielsen/LID

Post by propeine » Mon Dec 05, 2016 12:46 pm

JulietDeltaCustoms wrote:Nice work! I think the form1 community would certainly benefit from a diy booster! Any way we can get you to draw up a sketch?
Unfortunately, unless someone made a taper mount rear cap it wouldn't be of much use as designed. It would have to be built around their rear cap or redesigned to function as a standalone for say a sub gun can.

If someone needed help designing one for their own can I could certainly help with that. They aren't as complicated as people would have you believe.

KenHo
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Re: Another Nielsen/LID

Post by KenHo » Tue Dec 06, 2016 10:18 pm

You did good!!! I just "barely" understand what the booster does, and no idea how to make one. Your photos are the first I've seen inside. Thanks for posting.

Ken H>

propeine
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Re: Another Nielsen/LID

Post by propeine » Wed Dec 07, 2016 10:29 am

KenHo wrote:You did good!!! I just "barely" understand what the booster does, and no idea how to make one. Your photos are the first I've seen inside. Thanks for posting.

Ken H>
While linear inertial decoupler sounds fancy, at the end of the day its a damn shock absorber. Concentricity of the parts is important, tolerance is important and the faces need to be square. After making one, the "mystique" around them is BS in my opinion. Start around 25lb/in and then make sure the slide locks back. If it does with ease you can probably go up a little in spring tension, if it doesn't go down in spring tension.

The most important thing is to either do all critical concentric things in one operation or indicate everything back in every time. IE exterior of piston and threads of piston needs to be one op. Same with bore of the front portion, male threads to the can and female threads to hold the rear portion. Leave no room for misalignment and you'll be fine.

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