Author Topic: XS60C PCP Repeater project (Read 455637 times))

rsterne · « **Reply #980 on:** February 27, 2015, 09:51:15 PM »

I didn't worry about the spring rate too much, I adjusted the preload to get to about 7 lbs. of force on the seat, which is about what the stock 60c valve and the Disco valve use.... The spring force is a minor part of the closing force on the poppet, most of it comes from the air pressure pushing on the area of the valve stem, which penetrates the valve body.... When the valve is open, it has full air pressure on one side and only 15 psi on the other.... At 2000 psi, the closing force on a 1/8" stem is ~25 lbs.... There is also a small closing force from the drag of the air moving around the head of the poppet (creating a small pressure differential across it).... The spring will be less than 20% of the total closing force....

Bob

RMM · « **Reply #981 on:** March 01, 2015, 08:39:41 AM »

Thanks Bob, this puts the know in knowledge. There's more to these airguns than just filling them with air and shooting pellets.

stalwart · « **Reply #982 on:** March 01, 2015, 02:14:49 PM »

Lloyd showed me how to put a gap between the DD tubes... giving us the option of running the lower tube to the end of the receiver (no gap), or all the way back to the trigger guard (2.5mm gap).

The latter will take much more stock work (or inletting a custom)... but will be good for another 4.5"+ of reservoir.

rsterne · « **Reply #983 on:** March 01, 2015, 04:44:25 PM »

I'd ask Norm if he can inlet the Blaster 2.5mm deeper without a custom inletting setup required....

Bob

stalwart · « **Reply #984 on:** March 01, 2015, 07:19:10 PM »

How sweet would that be?

RHytonen · « **Reply #985 on:** March 02, 2015, 01:48:24 PM »

Quote from: RMM on February 27, 2015, 04:03:03 PM

If you'll look back in this thread I've made a reverse valve spring version of your maxi valve but found out it's not the best valve to use on a 60. I was having problems with the spring/ spring guide and jam nut touching the I.D. of the backer block tilting the valve face from the seat and causing an air leak. If I increased the backer block I.D. large enough to eliminate the interfernce the nose of the 60 striker would beat itself into the new I.D. changing lift and eventually jamming the nose into the blocker hole. This reverse valve spring design will work great with a flat face striker.

I wonder if that's what the Cothran valve does? - somehow create a reduced-friction, channeled piston that provides ALIGNED valve return (and controlled dwell?) somewhere outside the pressurized air intake path?

Just wondering... controlled (but noninterfering) dwell would be sort of a holy grail, though it was implemented in the earliest airguns, to rumored great effect, as we've all read, by interfering with the hammer stroke..

Rod

stalwart · « **Reply #986 on:** March 25, 2015, 06:01:38 PM »

Rod, I'm not sure how it works. There was a theory posted on the Canadian forum, but it is just that.

Is anyone else getting sporadic results from the notification feature here?

stalwart · « **Reply #987 on:** April 12, 2015, 11:56:48 AM »

Guys, I just got a dealer inquiry from the UK... and I have never shipped anything there.

Are there any pitfalls I should look out for? Is there a shipper who is demonstrably better to use (or one I should avoid)? Any hints for making the process smoother?

TIA!

moorepower · « **Reply #988 on:** April 12, 2015, 09:38:12 PM »

Legal, would be at the top of my list.

rsterne · « **Reply #989 on:** April 12, 2015, 09:47:44 PM »

Under 12 FPE if the customer doesn't have an FAC, and under 6 FPE for pistols.... but that's likely the dealer's problem to sort out.... No suggestions as to method of shipping.... Air Mail may be the cheapest without taking 2 months.... I think most eBay from the UK comes that way....

Bob

StevenG · « **Reply #990 on:** April 13, 2015, 01:45:05 PM »

Likely USPS airmail is the cheapest. You will need to fill out a customs form.
Legal issues should not be a problem for you, but for the dealers. Assuming you fill out the customs forms accurately.

rsterne · « **Reply #991 on:** April 14, 2015, 01:04:43 PM »

I'm sorry to see this thread moved to the PCP Gate, as it will soon disappear from the front page and be lost.... I see no reason it couldn't have been left in the Chinese Gate.... JMO....

Bob

stalwart · « **Reply #992 on:** April 14, 2015, 03:46:45 PM »

Thanks for the input, guys! USPS is the easiest for me, so I'm glad to hear this.

Bob, I don't get why this was moved, either... after nearly 48K views. Will this affect the ability of non members to find it when searching?

ezman604 · « **Reply #993 on:** April 14, 2015, 05:46:47 PM »

Objections duly noted.
We have been doing a lot of overdue house cleaning lately. This is a PCP thread and belongs in the PCP gate. I support our moderators for the move.
Yes, it has almost 48K views. That is fantastic. WHERE it resides on GTA should make no difference in a search. The results will follow the search.
And as far as being buried? Not if interest remains and folks post to it. The thread, just as any on this forum, will stay on the front page as long as it is posted to routinely.
We could sticky it if it warrants such an action. But sticky's are mainly pertaining to as subject of interest to ALL watchers of that particular gate. I don't see moving it to the Chinese Gate as doing any justice to this thread myself.

stalwart · « **Reply #994 on:** April 14, 2015, 06:09:48 PM »

Dave, I honestly don't know enough about how this all works to object to anything yet. I was curious... but, I did enjoy being able to find it quickly.

It has sat on top of google for a long time... and as I don't use images hosted by others, it requires anyone really interested to join GTA to get the full scoop. Again, I don't know for sure, but I thought that was a good thing.

Will this move effect the standing on google?

ezman604 · « **Reply #995 on:** April 14, 2015, 06:14:06 PM »

Quote from: ezman604 on April 14, 2015, 05:46:47 PM

WHERE it resides on GTA should make no difference in a search. The results will follow the search.

Until I can see differently.....this statement should have covered it. Certainly is no intent to "BURY" such a good topic. Just putting it where it belongs.

stalwart · « **Reply #996 on:** April 14, 2015, 06:23:24 PM »

Ok, so you meant an internet search, not just a GTA search. I wasn't sure.

As it is now clear that this belonged in the "Dark Side" all along, can I expect a shipment of cookies soon? I am lift gate ready here, and a dock is just around the corner.

ezman604 · « **Reply #997 on:** April 14, 2015, 06:23:43 PM »

FYI
I just did a Google Search of XS60C Repeater. Top result was to Stalwart Arms. Second was THIS thread. I think we are good to go.

https://www.google.com/search?q=XS60C+Repeater

stalwart · « **Reply #998 on:** April 14, 2015, 06:29:01 PM »

LOL... and your post just pushed it back over SA.

It's a VERY small pond...

ezman604 · « **Reply #999 on:** April 14, 2015, 06:30:19 PM »

LOL
See...no harm no foul. But house cleaning accomplished too.

Thank you to our advertisers!

XS60C PCP Repeater project

Author Topic: XS60C PCP Repeater project (Read 455637 times))