Technical Analysis of the HW100

[Anno]

Hi martin,

these are no washers, they are dish springs. You have to stack them in pairs, hollow sides together.

Edit: just found http://talks.guns.ru/forums/icons/forum ... 344119.jpg

looks like they have parralelized by 2 dishes, building 5 1/2 groups of 4.

schema:

| )) (()) (()) (()) (()) (()) |

'|':washer
'(':right dish
')':left dish

[DeBreuR]

Hey, that's strange.

in my hw100 i only have 16 dish springs. instead of 18, and i never found the 2 washers in there.......



my rifle seems to be incomplete



But, when i take them out, and place them back in the following position:
(())(())(())(())

Then there is just enouch space to put the big hex-bolt back in place.....


hmm, still it's strange, that there are different variations of this rifle are "out there".

[Anno]

Studying the picture again i think its ))) ((())) ((())) ((())) (((.

The pic is from a russian forum thread mentioned earlyer here. Maybe it's just a tuning-test from one of their members ? Unfortunately, i cannot read russian. ( My english is bad enought... )

[ETA]

Another question from another new member -- on one of your first few pictures you show the regulater (C3) -- well i completly removed this and ended up with the washers/shims which are under it going everywhere (when you,ve stopped laughing my question is this) the washers / shims are not completly flat so which way do they go in, I did manage to find a diagram on the web which shows how many there are but not with the detail to answer my question, hope you can help many thanks --martin

Those shims are disk springs (Belleville washers) for the regulator. These disk springs gives you tremendous spring force in a very compact package. The spring force can also be easily changed by single, double or triple stacking them. As a rule of thumb, alway place them so the 'open cup' side out at the ends.

)()()()()()()()(

Twice as the spring force: ))(())(())(())((
Three times: )))((()))((()))(((

Been a long time since I opened up my HW100. I think the disk springs are double stacked in mine.

[mal9101]

Hi,
Does anyone know what could be the problem with my hw100.
I have stipped the gun down to clean and rebuilt it, everthing seems right but when i fire the gun the pellet just about falls out of the end of the barrel and you can feel air blowing back out of the breech. I have change the o ring seal in the breech but it still has the problem. I have stripped it down and rebuilt it about 6 times but still have the same problem.
Anybody help please.
mal

[ETA]

Hi,
Does anyone know what could be the problem with my hw100.
I have stipped the gun down to clean and rebuilt it, everthing seems right but when i fire the gun the pellet just about falls out of the end of the barrel and you can feel air blowing back out of the breech. I have change the o ring seal in the breech but it still has the problem. I have stripped it down and rebuilt it about 6 times but still have the same problem.
Anybody help please.
mal

It is important to assemble the HW100 in the right sequence for it to seal properly. To do it right, you have to remove or loosen the barrel. Where the barrel enters the front of action block C, there is a Allen bolt that holds the barrel just below the barrel. It presses the barrel against C1. Take out that bolt and slide out the barrel. This way the barrel will not get the in way of securing C1 to C. Also when replacing the barrel; it should be the final step in assembly of the action, the barrel bolt will press the barrel seal O-ring tight against C1.

Make sure all the O-rings are in place and in good condition. There are four O-rings: the barrel face O-ring that sit on the face of the barrel; the valve stem O-ring, the pellet probe O-ring (both of these are inside their respective bores in C1) and the O-ring that seals C1 to C.
In the big picture of C1 you can see three of the O-rings. On the picture of C3, you can see the O-ring on the face of the barrel.

Hope that helps.

[sniper]

Hi,
Does anyone know what could be the problem with my hw100.
I have stipped the gun down to clean and rebuilt it, everthing seems right but when i fire the gun the pellet just about falls out of the end of the barrel and you can feel air blowing back out of the breech. I have change the o ring seal in the breech but it still has the problem. I have stripped it down and rebuilt it about 6 times but still have the same problem.
Anybody help please.
mal

well, if you feel the air blowing out of the breech when the gun is fired, the
only places that can happen from the valve stem (the little o-ring) or the
seal that seal off the bolt probe ....

[mal9101]

The air is blowing back from the bolt probe but i have fitted a new o ring,
if the probe is in place, when i blow air down the barrel air will bloow out. it is though the probe is not going forward enough to cause it to seal. should it be a tight fit?

[sniper]

The air is blowing back from the bolt probe but i have fitted a new o ring,
if the probe is in place, when i blow air down the barrel air will bloow out. it is though the probe is not going forward enough to cause it to seal. should it be a tight fit?

Well yes, tight enough so that the air doesn't leak out .....

[trip43]

ETA , this is a great write up on the HW , where did you buy yours ?
I`m thinking of geting one ,which power level do you reccomend ,the 12ft/lb
or the 20 ft/lb in 177 cal ?

[ETA]

ETA , this is a great write up on the HW , where did you buy yours ?
I`m thinking of geting one ,which power level do you reccomend ,the 12ft/lb
or the 20 ft/lb in 177 cal ?

Thanks Trip43. I got mine from Illingsworth. D&L and Specialty Shooting Sports also sells them. All three are excellent dealers. Specialty Shooting Sports seems to have the best price these days.

I have a feeling the designer of the HW100 spend most of their efforts designing around 12ft/lb. You get a good number of shots at 12ft/lb and the more compact shorter barrel. IMHO, the longer barrel of the FAC version look a bit odd and out of place.

[AsianFire]

The thought "Zen and the art of AG maintenance" somehow came to mind when I was reading ETA's HW100 write up.

[tgif]

First of all thank you ETA for everything. Recently bought a second hand HW100T but I'm noob around pcp guns so I'm happy that Steve guided here from the BBS forum.
What I know about my gun: earlier it was set over 20J but I have to set it back below 16J because field target and HFT reasons.
I turned the hammer spring's allen screw back and now I'm around 16J but as I measured the muzzle velocity it looks a bit strange, so I think (as I read the forum) I have to play with the regulator too.
The main problem is I can't get steady velocity, it is slowly increasing as the air pressure goes down in the cylinder. See the diagram:
http://www.freeweb.hu/condrix/hwtest.xls

The other thing is: I'd like to know where is the correct place of this spring marked by red arrow:


Thanks!

[Anno]

Hi tgif,

...The main problem is I can't get steady velocity, it is slowly increasing as the air pressure goes down in the cylinder...

To get consistent speed you have to stay in balance.

First turn back the regulator a bit.
Then find a hammer setting wich gives the maximum speed.
If this is still to much, goto first.

Anno

[tgif]

Ok, so have to turn a bit back (I mean to left) the C3 allen?

And what about this spring on the picture? Is it on the right place?

Thanks Anno!