Simple "how to" on rebuilding your NP gun from Crosman
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Simple "how to" on rebuilding your NP gun from Crosman
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GTA-Airgunner
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Real Name: Rick Eutsler
Simple "how to" on rebuilding your NP gun from Crosman
«
on:
December 08, 2011, 09:59:04 AM »
Hello all,
Someone suggested that I post my recent Take AIM here in the Shop Talk. I guess I'll start posting all my Take AIM videos here as they all deal with the day to day "how to" of airguns.
Before I post this, I just want to say, and confess that I certainly don't know everything about airguns and I'm sure that most of the folks here know a lot more than I ever will about tuning and repairing airguns.
So here goes. I hope you all enjoy the video and find it helpful. I use a custom designed spring compressor that continues to work very well for me. I'll get with my machinist / welder friend and get the plans together so folks can build them if they like.
Cheers
Rick Eutsler
AirgunWeb.com
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #1 on:
December 08, 2011, 12:18:41 PM »
Excellant write up rick. I have been following your vids and reviews for about a year. This is a great teardown and explanation for the new guys, this vid should be stickied. Also, was going to ask you, i take my dremel and debur the cocking slot so it doesnt chew up the seal. I also ran a brake cylinder hone on a drill through my Trail XL to clean off the paint on the inside and cross hatch the cylinder before i molyd it. What a world of difference! I average 905fps with 14.3gr cphps with and extreme spread of 3 fps. I am convinced the extreme spread is due to ammo imprefections though. Again, awesome write up rick. Keep up the good work man. I love your unbiased writeups and reviews of new guns!
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GTA-Airgunner
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Real Name: Rick Eutsler
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #2 on:
December 08, 2011, 12:29:28 PM »
Thanks.. I wanted to polish the chamber on my Trail as well.. I'll give your method a try.. Ultimately I'd like to work up a set of wooden jigs that can be covered with something like a scotch bright pad and run in and out of the chamber while attached to a drill. Also something that I can turn the pistons on as well. I don't want to have to purchase a lathe just for that.. but it may give me a reason to build that extra workshop off the house
Cheers & Thanks!
Rick
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gene_sc
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #3 on:
December 08, 2011, 07:03:04 PM »
I spoke for quite a while on the phone with Rick last week. Quite a guy. His video reviews have been very helpfull to many of us. Worth watching in my opinion. Rick cuts them no slack when something is not right....
And I also like Rick's new beard..
It becomes him..
I would like to stop here and share a few words of wisdom.
Although Rick is great at his reviews after watching his video on rebuilding an NP gun from Crosman.
I do have some issues with this video. I would like to be as objective as possible here.
For example. I certainly would not try and do video reviews on air guns...
I know my limits..
OK Ricks video on the tear down and reassembly of the NP is just that. As you can see there is not real tuning going on here. I am sure Rick knows that and meant for the video to be just a general how to do video only.
I commend Rick for showing all of us how an NP can be torn down and reassembled. There also are many techniques on how to skin a wabbit as well...
When Rick mentions polishing, the only think I can think of polishing are trigger parts. Polishing combustion chamber or piston would be a disaster. I am sure he knows this. Especially if you reinstalled a new seal. Combustion chambers need to be cross hatche to do it properly. You only apply a light coat of moly one inch from back of seal back on the piston and one inch on rear of piston. There are parts that need to be deburred and done properly.
All I want to point out is this video good as far as depicting tear down and Assembly of the Crosman NP.
Take no offense please.
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THE ONES I SLEEP WITH: HW-97K, Crosman Kantana, CZ-200, Webley/Scott UK Tomahawk, Benji Marauder, Benji Discovery, Remington NPSS .177, Crosman Venom, Crosman RamQuest, Gamo 440, Gamo S1K, Gamo CFX Synthetic, Gamo CFX Royal, RWS 24
GTA-Airgunner
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Real Name: Rick Eutsler
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #4 on:
December 08, 2011, 07:33:29 PM »
Thanks Gene,
None Taken
Rick
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gamo2hammerli
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #5 on:
December 08, 2011, 07:58:46 PM »
Good video....just need some close-up shots when removing and replacing the little spring that holds the cocking linkage to the trigger assembly. And a close up shot on how to push out the E-clip. That would help a beginner.
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #6 on:
December 08, 2011, 09:29:57 PM »
I agree with Gene on certain aspect's of this video and actual tuning procedures and applying lubes in the right places in the right amount's is very important. Ed
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Michigan
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Izztyrr
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #7 on:
December 08, 2011, 11:46:20 PM »
Rick, so glad to see that you post on these forums. Like your honest product reviews. Been watching your videos since the start.
* Izztyrr waves to Naomi
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CharlieDaTuna
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #8 on:
December 09, 2011, 09:55:59 AM »
I agree with Ed and Gene. This is certainly not a tuning guide by any stretch of the imagine but basically just disassembly and assembly of the gun. And one thing for sure... you certainly do not want to polish the chamber or piston. Tuning goes far far beyond what is in the video.
CDT
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RedFeather
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Posts: 4741
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #9 on:
December 09, 2011, 10:18:14 AM »
Always good to see the footsteps in the snow, so to speak, so you don't wander off the trail when doing things mechanical like this.
One thing I'm sure no one has pointed out is the title of the thread. Nothing like buying a new gun only to "rebuild" it, is there? Ironic. Current discussion of the same over on the Crosman Gate.
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bradyman1
GTA Senior Contributor
Posts: 2777
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #10 on:
December 09, 2011, 10:30:10 AM »
I appreciate the video. It is a good tutorial on the break down and reassembly of the rifle. I have seen a lot of rifles apart, but I can't recall seeing a video of the process. That spring compressor looks handy. Very unique. Is there any chance of it damaging the scope rail? I don't know how much force you must apply to remove the end cap.
Again great job on the video, your reviews are great.
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GTA-Airgunner
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Real Name: Rick Eutsler
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #11 on:
December 09, 2011, 11:04:43 AM »
Hey there guys..
I just wanted to jump back in for a moment and clarify something. I used the term "polish" with regards to the compression chamber and piston which was obviously the wrong term. I've conferred with my associate about the scotch bright pad concept and it does the same "cross hatching" (forgive me if I did not spell "hatching" correctly) as a hone. Having never tried either, I'm eager to see how they work. I have enough guns here to test!
Also, I do want to reiterate that this was never meant to be a "how to TUNE your airgun" video. I've got a lot of learning to do before I would ever claim to know what I'm doing in that area. This was simply a video to show how these guns come apart and go back together and what basic tools and lubes are needed, i.e. Molly Paste.
As for the spring compressor and the scope rail. I've used it on everything from the NP guns to the Gamo Hunter Extreme. It's held up to anything that I've thrown at it so far. My original design had a shorter compressor screw that has been upgraded to be 2" longer.
In working on this for about a year now, there are a variety of other "parts" that you need to work on various guns, but the basic compressor works really well. I'm going to get the plans from my welder and post them on my site. I'll let everyone know once they are there.
Thanks to everyone that has jumped in and commented on this post.
Cheers
Rick Eutsler
AirgunWeb.com
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renowntwo
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #12 on:
December 09, 2011, 08:38:53 PM »
good video
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #13 on:
December 10, 2011, 05:41:35 PM »
Rick,
Nice video and I enjoy your airgun reviews on the YouTube (one of the reasons that I am addicted to AGs now, thanks).
The upside down scope mounting technique for the compressor is real cool, I don't think I've seen that approach before.
John
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shadow
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #14 on:
December 10, 2011, 07:57:10 PM »
Still a good how to break an airgun down vid and a good stepping stone for the new guy wanting to take a peek inside his or her shooter. Ed
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #15 on:
December 10, 2011, 08:23:18 PM »
I would like to say that the style of spring compressor that Rick has come up with is ingenious. When buying different kinds of springer's/gas rams there can be a difference in spring pressure. Some need special adaptors relieve pressure off of spring in order to remove them. Some springs are extremely powerful and very hard to compress.
Using scope mounts does raise a flag with me. They may work just fine with light duty springs but I would be hesitant to use this setup with a magnum springer.
Scope mounts are made to hold scopes and not designed to withstand high weight applied to them. It would seem to me that the 11 mm and 3/8" rail system would allow for slippage with extreme pressure applied.
These scope mounts for the most part are cast aluminum machined for specific millimeter scopes. They could break easily under pressure.
JMO with a bit of logic thrown in..
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South Carolina
THE ONES I SLEEP WITH: HW-97K, Crosman Kantana, CZ-200, Webley/Scott UK Tomahawk, Benji Marauder, Benji Discovery, Remington NPSS .177, Crosman Venom, Crosman RamQuest, Gamo 440, Gamo S1K, Gamo CFX Synthetic, Gamo CFX Royal, RWS 24
CharlieDaTuna
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #16 on:
December 10, 2011, 09:40:10 PM »
The scope mount compressor is not a new idea and somebody was playing with the idea 6 or 8 years ago. I even toyed with the idea myself. It was tried by several people but because of the length required to compress a spring it put a lot of pressure on the rear of the mount and the upward pressure that sometimes occurs sheared the rails. And there is no way of telling in advance when the failure is going to occur. With that in mind, I wasn't about to take a chance. I'm sure that is the reason why it was never marketed. A lawsuit in the making.
In my opinion it is not a very safe mount and under the pressure of a spring can cause a dangerous situation. It certainly isn't something that I would ever use with the exception of perhaps a gas ram. To me, it is just an accident waiting to happen and I wouldn't want to see anybody get hurt but to each his own.
Just my opinion.
CDT
«
Last Edit: December 10, 2011, 09:46:04 PM by CharlieDaTuna
»
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Simpsonville, SC
-----
I DO NOT ANSWER GENERAL AIRGUN QUESTIONS IN PM'S SO DO NOT PM ME WITH AG QUESTIONS.
Bob aka: CharlieDaTuna
Co-founder of the GTA
HOME OF THE GRT-III --- GRT-4G TRIGGER --- CBR TRIGGER
http://charliedatuna.com/GRT-III%20Trigger%20New.htm
http://www.charliedatuna.com/GRT-4G.htm
Home of the NPSS-NP (CBR) Triggers:
http://www.charliedatuna.com/NPSS%20non%20PP.htm
Website:
http://charliedatuna.com/
E-Mail: CDT22@Frontier.com
GTA-Airgunner
AirgunWeb / AirgunArmy
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Real Name: Rick Eutsler
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #17 on:
December 10, 2011, 10:03:52 PM »
Hey there.. It's Rick here again.
I wanted to explain a bit about how the connection between the rifle and the compressor is made so that, without assumption, folks can make up their own mind.
Again I want to say that who am I compared to wealth of knowledge of folks like Gene and CDT and I would certainly encourage folks to carefully consider their input.
I use a 2 step approach to hold the gun securely. Again, I've tested everything from a simple NP gun up to the Gamo Hunter Extreme. I've also used it with guns like the Tech Force 89 that has the miserable trigger block that sits down in the chamber. With any tool that is used under pressure, you have to be extremely careful. This is no different.
I use a 1" tube and a set of inverted weaver mounts. If you are working on guns that have them, then you are all set. No other attachments are necessary and they are rock solid. Most guns still use the 11mm rail which gets a bit tricky. What I do in these cases is to use the UTG 11mm to Weaver adapter with the stop pin which has been 100% successful in my tests.
Now the most difficult are guns that don't have a hole for the stop pin. These are a problem and you have to get creative. I've used the BKL 11mm to Weaver mount, which holds like iron, and I've used scope stops, whichever seems to be the safer choice given the task at hand.
Whenever you are testing something for the first time there are bound to be issues that come up.. But the test pilots and test drivers do get to have the most fun. At some point you have to just see if it is going to work.
So far, and again what is my experience compared to that of others, I've had great success with the design. Does it have it's limitations.. of course it does.. it must. There is always that circumstance that will trump the tool.. That is why we have so many different tools.
I'm working on a short article about the compressor and how I came by the design. Once it is done I'll post it on my site.
Cheers and have a great weekend.
Rick
AirgunWeb.com
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Bob P
Guest
Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #18 on:
January 28, 2012, 01:12:00 PM »
Well I surely thought the spring compressor idea was new when I came up with it in nov 2011!
Nobody seemed to know anything about it then.
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GTA-Airgunner
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Re: Simple "how to" on rebuilding your NP gun from Crosman
«
Reply #19 on:
January 28, 2012, 03:13:53 PM »
Hey there Bob,
Seems like a simple solution for securing the gun. I couldn't imagine that I was the first guy to try it. So far I've had great success with it. You still need to be careful and pay attention to what you are doing or it will bite you. But, that is the case for whatever you use to work on these guns.
I'm going to have a post soon (hopefully) that will be a close up look on how I put it together. Maybe you can help me refine the design from your experiences? I welcome any help that makes it more versatile and safer.
Cheers
Rick Eutsler
Airgunweb.
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Simple "how to" on rebuilding your NP gun from Crosman