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Author Topic: .257 cal Monocoque PCP  (Read 54059 times))

Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #80 on: December 12, 2015, 06:30:01 PM »
Today I attached the Front Cheekpiece Mount to the back of the Breechblock....



It is mounted below the centerline of the tube so that the inside of the Cheekpiece tube sits against the top of the upper Monocoque tube.... I also machined the front of the barrel to fit the 1/2" ID Bellevilles and threaded it 1/2"-20 NF for the nut that will provide the barrel tension.... The aluminum sleeve that bolts into the front of the Monocoque tube is 9/16" ID to fit on the larger part of the barrel, while the Bellevilles ride on the 1/2" section....



The front of the Monocoque tube is about 1/10" ahead of the muzzle to protect the crown.... If I wish, I can use a Hatsan Air Stripper instead of the nut to tighten against the Bellevilles to provide the barrel tension and also strip the air away from the back of the bullet....



This completes all the parts that fit inside the Monocoque tube.... except to machine the bolt slot which I will do after machining the tube.... I am still undecided if that will be my next step, or if I will make the valve first.... and put off machining the two tubes until the end....   ::)

Bob
« Last Edit: December 12, 2015, 06:33:58 PM by rsterne »
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #81 on: December 13, 2015, 08:19:45 PM »
I couldn't put it off any longer, so today I did most of the machining on the Monocoque Tube.... all the holes for the various bolts, plus the loading port and transfer port are done, plus the additional 10-32 tapped hole for the front of the Picatinny scope rail.... Here is the top view....



Everything fit really well, all the bolts fit into the holes, but a couple were tight enough to require a touch with a file or Dremel bit to make them easy to assemble.... Careful deburring was the order of the day to make sure that the Breechblock didn't hang up when slid inside.... I was particularly proud of how well the loading port lined up.... Below is the bottom view, and you can see that the transfer port and mounting bolts also line up with the Spacer....



All in all, I am very pleased.... The key to the accurate machining was using the 5/16" hole behind the loading port where the heads of the screws are that take the tension and compression loads of the barrel and tube.... Using a 5/16" pin in the chuck of the lathe through that hole, both for setup (measuring everything from that point), and for indexing 180* for the holes on the bottom, did the trick....

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline Matt15

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Re: .257 cal Monocoque PCP
« Reply #82 on: December 13, 2015, 10:34:17 PM »
Wow!! It is really coming along great!!
  • Il
Tuned Webley Patriot .25  28 FPE 
Benjamin Trail np pistol: 400 fps
Crosman 2100 12 pumps= 790 fps with 7.9 gr pellet

2017-2018 Squirrel Season
Squirrels: 20


2016-2017 Squirrel Season
The Total was:
15 Fox Squirrels
11 grey squirrels

Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #83 on: December 14, 2015, 04:30:27 PM »
Today I machined the top of the PRod trigger group to fit the 1-1/4" OD x 0.095" wall tube.... It normally fits a 7/8" OD x 0.065" wall tube, so one of the concerns is that the sear projects far enough into the thicker tube I am using to safely hold back the hammer.... I used the 1-1/4" diameter router bit I have to cut the larger radius, and at the point it barely touched the center of the recess (I removed 0.030" from the sides to get there) I stopped and checked the sear engagement.... It was about 1/32", which although I feel was perfectly safe (after all, the hammer can't raise up by more than the clearance in the tube), I decided I wanted a bit more.... I noticed that the boss in the casting that holds the sear pivot pin was about 0.010" below where the router cut, so I mounted the trigger group back in the milling attachment and milled down until I just touched the edge of that.... The arrow in the photo below points to that shiny mark, right beside the sear.....



With the trigger group machined to that depth, there is over 1 mm of sear engagement (I'll get an exact measurement after I cut the slot in the tube), and I'm happy with that.... One other thing that is important is that the slot in the tube to clear the sear must be slightly more than the full length of the sear.... The parts of the sear in front and behind the actual sear "bump" now project slightly above the bottom of the tube recess in the trigger group, so if the slot is too short, it would affect the engagement depth, and in fact could even prevent the sear from cocking properly.... All the other parts (the trigger and the intermediate link) are still well below the tube and do not interfere....

The PRod trigger is very strongly built, and I see no problem with it easily withstanding way more than the 20ish lb. maximum load I will be asking it to hold....

Bob
« Last Edit: December 14, 2015, 10:18:16 PM by rsterne »
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline MJP

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Re: .257 cal Monocoque PCP
« Reply #84 on: December 15, 2015, 02:23:14 AM »
That's what you get with some spare time and dedication. Good work there Bob. Waiting anxiously for the finished gun and how she will shoot.
Marko
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Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #85 on: December 16, 2015, 07:15:00 PM »
Today I made the front half of the Valve, and cut the O-ring groove in the Fill Fitting while I was set up for that....



You will notice that I am using a conical valve spring to eliminate any restriction on the inlet side of the valve poppet.... I hope to work on the back half of the Valve tomorrow....

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #86 on: December 18, 2015, 11:08:20 PM »
I worked on the Valve today, and completed the machining on the body....



While the rear half was in my square Collet holder so that I could index it 90* to drill and tap the four 1/4"-28 mounting holes, I also drilled the port and the two 8-32 screw holes beside that which hold the two tubes together at the front of the Breechblock.... In addition, I screwed the valve front into place and drilled and tapped 1/8"-NPT for the gauge which mounts on the left side.... I was extremely pleased with how well everything lined up.... Here is a photo of the assembly (without the tubes)....



The two long 8-32 screws which hold everything together dropped right through the holes and screwed in with my fingers.... I still have to make the poppet, and install an O-ring seal for the stem in the back of the valve, but this is the last major internal part.... It won't be long I will be able to machine the lower tube to hold the valve, hammer, and fill fitting.... Unfortunately, I am still waiting for the 1/4" long 1/4"-28 SHCSs which hold the valve and fill fitting in place against the air pressure, so I won't be able to pressure test it until they arrive....

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline William

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Re: .257 cal Monocoque PCP
« Reply #87 on: December 18, 2015, 11:31:09 PM »
Looking good Bob, it wont be long and you will be throwing lead down stream!
Everything looks clean and well fit thats for sure.

Good luck and have fun

William
  • Mississippi
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Sam Yang Recluse .357/9mm Stock setup so far.
Benjamin Discovery .22 w/Double Tube Kit, Boyds Blaster stock & BNM Breech. Regulated @ 1800 PSI 3000 PSI Fill Modified
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Offline oldpro

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Re: .257 cal Monocoque PCP
« Reply #88 on: December 18, 2015, 11:54:41 PM »
 This is some very fine work from a guy who claims he runs a small Inn in Canada of all places...Are we sure Bob is who he says he is?  I bet hes hiding with the witness protection system and most likely is a CIA or KGB operative and expert weapons maker. What do we really know about Bob or Mr. Bourne??? HHHmmm
« Last Edit: December 18, 2015, 11:56:22 PM by oldpro »
  • Katy, Texas
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Offline Stikman

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Re: .257 cal Monocoque PCP
« Reply #89 on: December 18, 2015, 11:57:03 PM »
Travis...I think he is the armorer for Bond...James Bond....
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Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #90 on: December 18, 2015, 11:58:56 PM »
*L*

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline oldpro

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Re: .257 cal Monocoque PCP
« Reply #91 on: December 19, 2015, 12:26:53 AM »
LOL love it,, Good work old man your skills are impressive.
  • Katy, Texas
Raptor mini 2 in .25
Huben k1 .22
Diana 56
FX tarantula
Walther R8
LCS SK-19
Airacudas

Offline Bill G

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Re: .257 cal Monocoque PCP
« Reply #92 on: December 19, 2015, 09:35:17 AM »
I'm still trying to figure out how he has the time and energy to run a lodge and be an airgun scientist and builder.  He has to have energy like my 9yr old.    ;D

Keep it up and stay young professor. 

Bill G

  • Nicholasville KY
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Offline Matt15

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Re: .257 cal Monocoque PCP
« Reply #93 on: December 19, 2015, 11:05:24 AM »
Nice work!!!  How big is the valve compared to a disco?
  • Il
Tuned Webley Patriot .25  28 FPE 
Benjamin Trail np pistol: 400 fps
Crosman 2100 12 pumps= 790 fps with 7.9 gr pellet

2017-2018 Squirrel Season
Squirrels: 20


2016-2017 Squirrel Season
The Total was:
15 Fox Squirrels
11 grey squirrels

Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #94 on: December 19, 2015, 01:33:05 PM »
The valve is the same OD as an MRod valve (and 4.25" long), but the ports are bore-size (actually, slightly over 0.257") on the outlet and huge (2.5X bore area) on the inlet side.... so the effective volume of the valve is the entire reservoir, 400cc.... In addition, there are no 90* turns in the ports, the throat of the valve is well radiused where it blends into the exhaust port, which then turns 30* into the 17/64" transfer port, and then another 30* turn into the port in the receiver, which will then blend into the barrel though an oblong port measuring 3/16" wide x 5/16" long, with NO bolt probe in the way.... The valve throat is 5/16", sealed by a 3/8" PEEK poppet on a 1/8" stem, so the throat area is 24% greater than the bore area....

You will notice that my airgun building (shop time) happens in the winter when the Motel is pretty much dead.... *LOL*.... For the rest of the year I just spend all my spare time thinking....

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #95 on: December 19, 2015, 04:18:00 PM »
I made the rest of the valve parts today.... Here is the finished poppet and stem seal....



The poppet is made from 3/8" diameter PEEK, and I threaded the end of the 1/8" drill rod stem to 5-40 thread, drilled the PEEK with a #38 drill (tap size for 5-40) and counterbored it 0.10" to 1/8" and then just wound the stem into the PEEK, letting it cut its own threads until it stopped.... It was so solid I couldn't back it out.... I then cut the head to length and turned it for the spring seat right on the stem.... It sealed first time.... The stem seal is a #006 70D O-ring sitting in a 1/4" diameter recess in the valve body, held in place with a short piece of 7/16" bolt faced off flat on both ends and a screwdriver slot ground in the end for installation.... It has only enough drag to barely hold the weight of the valve body, so considering the forces on this valve shouldn't even be noticed.... The inside of this valve is huge....



The throat  (visible in the bottom of the rear section on the left) is 5/16" ID, so the seat margin is only 0.030".... The valve is drilled 11/16" ID, leaving a 5/32" gap all the way around the poppet head (4 times the throat area).... The front of the valve is drilled 13/32", the same as the front ID of the conical valve spring, and so has twice the area of the throat, allowing the air to enter the valve from the reservoir much easier than it can get out.... I don't think there should be any problem with this valve flowing air....

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline Matt15

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Re: .257 cal Monocoque PCP
« Reply #96 on: December 19, 2015, 07:04:21 PM »
The valve is the same OD as an MRod valve (and 4.25" long), but the ports are bore-size (actually, slightly over 0.257") on the outlet and huge (2.5X bore area) on the inlet side.... so the effective volume of the valve is the entire reservoir, 400cc.... In addition, there are no 90* turns in the ports, the throat of the valve is well radiused where it blends into the exhaust port, which then turns 30* into the 17/64" transfer port, and then another 30* turn into the port in the receiver, which will then blend into the barrel though an oblong port measuring 3/16" wide x 5/16" long, with NO bolt probe in the way.... The valve throat is 5/16", sealed by a 3/8" PEEK poppet on a 1/8" stem, so the throat area is 24% greater than the bore area....

You will notice that my airgun building (shop time) happens in the winter when the Motel is pretty much dead.... *LOL*.... For the rest of the year I just spend all my spare time thinking....

Bob

Thanks Bob!!
  • Il
Tuned Webley Patriot .25  28 FPE 
Benjamin Trail np pistol: 400 fps
Crosman 2100 12 pumps= 790 fps with 7.9 gr pellet

2017-2018 Squirrel Season
Squirrels: 20


2016-2017 Squirrel Season
The Total was:
15 Fox Squirrels
11 grey squirrels

Offline Motorhead

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Re: .257 cal Monocoque PCP
« Reply #97 on: December 19, 2015, 07:37:23 PM »
Been a spell sense checking in .... Darn Mr.Bob you have been quite busy of late !
Looking more and more like something mechanical  :o tho shy of calling it an Air rifle just yet  ;D
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Offline rsterne

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Re: .257 cal Monocoque PCP
« Reply #98 on: December 19, 2015, 08:34:06 PM »
Yeah, right now it is simply a growing pile of parts.... *LOL*.... About the only piece identifiable as a rifle is the rear Stock....

Bob
  • Coalmont, BC, Canada
🇺🇦 Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦

Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).

Offline Lee in Texas

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Re: .257 cal Monocoque PCP
« Reply #99 on: December 20, 2015, 12:26:48 AM »
Just read the whole thread. Absolutely fascinating. Will you be making more of these to sell?