Part 2, Regulating the B50/51
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Part 2, Regulating the B50/51
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Topic: Part 2, Regulating the B50/51 (Read 4809 times))
TheBman
Springer Fan
Sharp Shooter
Posts: 508
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Real Name: Brent
Re: Part 2, Regulating the B50/51
«
Reply #20 on:
October 15, 2014, 05:18:16 PM »
Hey Ped
Did you do any shot strings with it at 12fpe and if so what was your shot count at that power level? Some people might interested in the data at that level.
Thanks,
Brent
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Norman Indiana
TX200HC .177
PROSPORT .177
HW95 .177
R11 .177
HW97KT .177
HW97K .177
ped
Sharp Shooter
Posts: 548
yes
Re: Part 2, Regulating the B50/51
«
Reply #21 on:
October 16, 2014, 06:28:20 AM »
i did but i lost all my data when my computer went pear shaped and as i'm going to be fitting a .20 barrel when it gets here i never repeated the strings
the results were promising though and as a result i've just fitted one of the same regs to a disco hows 180 shots from a 3000psi fill (valve pinning is uprated for the higher fill) only done one test at present and need to fit a gauge to find the most efficent reg setting then adjust port ,hammer weight,spring preloade and valve spring
i'll try to find a graph of this one
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TheBman
Springer Fan
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Posts: 508
yes
Real Name: Brent
Re: Part 2, Regulating the B50/51
«
Reply #22 on:
October 16, 2014, 06:34:29 AM »
Hammer and adjustments
Pic 12 is the original hammer and spring guide. Reading Motorheads previous posts he gave us the information to make the hammer out of nylon and the weight suggested was 30-35 grams and he increased stroke length by approx. 3/8 inch.
I made my hammer to the same dimensions as the original, snubbed the nose by 3/8th's and tapped the striker threads deeper into the hammer. I reused the original striker and drilled and tapped the vent hole for the striker grub screw. The vent hole is now blocked by the striker...so, you'll have to relocate that, I went linear. The spring guide I originally made is the same with the exception of the the stem extending into the spring. I increased the diameter to better fit the spring.
The second shot string I posted was shot with no hammer spring adjuster, just the spring inserted and adjusting via the striker. So you could simply machine reduced/increased spring tension into your design and not have a hammer string adjuster.
I elected to make an adjuster for the hammer spring. I used a 1/2-20x2 allen head setscrew for mine with a 1/4 hole drilled through it to allow striker adjustments. Just remember, if your overall length is too long, the spring guide length will need to be reduced or it won't cock
This area is kind of vague I know, but I chose to make some length adjustments to the spring guide after the second shot string to facilitate a greater range of adjustment which would allow me to turn power down somewhat more should I choose to do so.
So, the design is really up to you and what you want to be able to do with it.
There are a multitude of ways to make the adjuster and make it work. My suggestion is to research several and look at the pros/cons of each and choose one.
«
Last Edit: October 17, 2014, 05:36:42 AM by TheBman
»
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Norman Indiana
TX200HC .177
PROSPORT .177
HW95 .177
R11 .177
HW97KT .177
HW97K .177
TheBman
Springer Fan
Sharp Shooter
Posts: 508
yes
Real Name: Brent
Re: Part 2, Regulating the B50/51
«
Reply #23 on:
October 16, 2014, 05:37:03 PM »
Barrel port and transfer port
Pic 13 shows the barrel port. I opened it up to .150, which is getting close to max for a .177. I have not experienced any loading issues or pellet damage issues at this size.
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Norman Indiana
TX200HC .177
PROSPORT .177
HW95 .177
R11 .177
HW97KT .177
HW97K .177
TheBman
Springer Fan
Sharp Shooter
Posts: 508
yes
Real Name: Brent
Re: Part 2, Regulating the B50/51
«
Reply #24 on:
October 16, 2014, 06:35:55 PM »
Well, at this point I decided to assemble and take things for a test drive to get an idea of where I was at. I knew I was going to have things that needed to be tweaked or fixed, but there was no way of knowing what unless I put some lead down range over the chrony. It was a shot in the dark… a rookie with a regulator running on some info found here as posted by MotorHead. What could go wrong…right??? Honestly, I was pleasantly surprised the first time I pulled the trigger and it actually shot!
The second shot string that I posted in my original post, rsterne said I was within 2% on all my shots right at 20 FPE. As I understand things, that aint to shabby. However, as it was to fast for where I really wanted to be (and wanting more shots
), meeting my goals of the build, and of course tinkerer I am I just had to put in that hammer spring adjuster in. Now I am learning to adjust things out…because I have to...and thats a great thing so I understand it better. Here is a string after the adjuster was installed. I am around 4% here and need to spend some time getting it lined out.
Fill pressure 3000psi JSB 10.34 .177
1-10 858 854 865 873 868 867 860 856 853 854
11-20 858 865 857 859 854 858 858 855 850 851
21-30 852 849 852 855 848 847 844 850 845 849
31-40 845 845 843 845 848 844 839 837 829 837
41-50 844 842 841 844 848 847 840 834 839 839
51-60 836 842 841 840 836 843 838 835 835 836
61-70 845 840 838 848 841 840 840 847 842 842
71-80 842 840 843 848 846 846 846 844 848 846
81-90 854 858 864 874 872 879 880 886 890 887
91-100 895 891 891 891 892 890 890 890 888 885
101-110 875 874 871 870 862 859 861 857 859 853
110-113 err1 err1 err1 err1 ( really overcast sunlight gone..clouds)
refill pressure 1125 psi
So, thats where I am at at present. Still have work to do, but it was cheap, I did it myself, and I can hit what I aim at...lots of times now
As my Uncle Goosey used to tell me when I was learning to drive..."Get in the middle and go boy".
Motorhead...dude...thank you sir for the information you unselfishly put out here about this gun for us to run with to get a start. Not many guys would do that...especially being a tuner! I can only imagine what one of your tunes must do to one of them. Again...Thanks!
Mr RSTERNE thank you too sir for continued help you give to countless people on this forum in many areas.
I think both of you guys neck's have to hurt carrying around all that stuff in your head!
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Norman Indiana
TX200HC .177
PROSPORT .177
HW95 .177
R11 .177
HW97KT .177
HW97K .177
Motorhead
Field Target Shooter .... Stand em up Shoot em down
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Real Name: Scott
Re: Part 2, Regulating the B50/51
«
Reply #25 on:
October 16, 2014, 09:37:49 PM »
Looks like it is coming off regulation @ shot 82ish .... Need to LOWER Regs set pressure @ 100-200#, reduce hammer strike a tad getting back to same velocity. Doing that rifle will shoot under regulation to a lower pressure and when coming off the Reg hammer strike is a tad less as well which should reduce the velocity rise.
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PCP/CO2/HPA Air Gun Gates "The Darkside"
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Part 2, Regulating the B50/51