RAW Rapid Need Help - RAW Micro HM1000 - Acts like not regulated

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Bramezy

Bramezy

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Jan 1, 2018
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Hamilton, Ohio, United States
So Ive emailed and called RAW, been waiting days for a return email or call. Kinda sucky.

I just need some ideas.
Micro, HM1000 acts like its not regulated in the sense of I can adjust the hammer spring, get two to three shots consistent then it starts to climb in velocity. Ill readjust and repeat this process over and over. Ive put new orings on the reg and cleaned up the bellville washers and same result.
Ideas on what to check?
Ill fill to 200bar and run it down to 150. Ive wasted one crap ton of pellets chasing this thing.
 
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That's a tough one to diagnose from the available information. Let's get a baseline without changing the hammer spring tension.

Normally that would mean doing a full string but since...
Bramezy said:
Ive wasted one crap ton of pellets chasing this thing.
Click to expand...
...so instead try collecting velocities at different reservoir pressures and report back.

3 shots at 200 bar
3 shots at 175 bar
3 shots at 150 bar
3 shots at 125 bar
3 shots at 100 bar
 
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Only 2 places within a RAW regulator where set point drift can come from ...
The screw in brass seat / bottle valve depressor disk. It being loose or a bad o-ring under it reg goes into bypass.
The soft seat portion that is pressed into the end of inner spool not sealing .. again bypass and set point drift.
 
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I will say right up front I have not examined a RAW regulator. You are already getting help from much more knowledgable people.

But for the gun to be effectively unregulated it should exhibit a bell shaped curve with velocity at high pressure lower, then it rises as pressure decreases, and then falls again at low pressure. I think that is what the data is about. Confirm the diagnosis. Unregulated guns can be tuned differently than this but this is what my guns have done when the regulator failed. They are SPA and Huma regulated.

It was not exactly unregulated behavior but the regulator in two of my SPA guns was acting very oddly recently with low velocity initially rising as the pressure came down. Perhaps I did not go low enough in pressure to see the fall and it was unregulated behavior. I fixed one of them by lubricating the O-rings of the stem the bellville washers are on and the cylinder they slide on. I haven't tested the other, it may be fixed too. I saw debris in them and cleaned it out throughly but only lightly lubed the O-rings and didn't lubricate the cylinder at all. This was after I had a failure of a Huma in my Caiman X that seemed to be caused by a gross excess amount of silicone grease in this area. Later that same regulator failed because it didn't have any detectable grease on the O-ring sealing the adjustment stem at the top.

Long way of saying my experience is that especially the area of the washers is particularly sensitive to having the right amount of lubrication. The stem the washers are on is effectively a piston and has to move pretty freely up and down. Up to seal the gun, down to readmit air after you fire. It only moves 1mm or less but it has to move for the regulator to work. If it sticks the regulator won't work.
 
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Motorhead said:
Only 2 places within a RAW regulator where set point drift can come from ...
The screw in brass seat / bottle valve depressor disk. It being loose or a bad o-ring under it reg goes into bypass.
The soft seat portion that is pressed into the end of inner spool not sealing .. again bypass and set point drift.
Click to expand...
Thank you Scott, appreciate your time.
 
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Bramezy said:
So Ive emailed and called RAW, been waiting days for a return email or call. Kinda sucky.

I just need some ideas.
Micro, HM1000 acts like its not regulated in the sense of I can adjust the hammer spring, get two to three shots consistent then it starts to climb in velocity. Ill readjust and repeat this process over and over. Ive put new orings on the reg and cleaned up the bellville washers and same result.
Ideas on what to check?
Ill fill to 200bar and run it down to 150. Ive wasted one crap ton of pellets chasing this thing.
Click to expand...
is this a brand new rifle?
 
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I got close to going the Huma route recently when two different SPA regulators were frustrating me. But I had bigger issues with the Huma in my Caiman when it was new apparently due to poor assembly. Too much silicone grease in the washers and none on the O-ring on the adjustment screw. I can't claim to be good at it but so far I've managed to fix all my regulator issues. New O-rings and the right amount of silicone grease in the right locations have been the only issues I've had. All issues were fixed at nearly zero cost. O-rings I had and silicone grease I keep around.
 
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Sounds like your logic is spot on,lube is good in the right amounts and the right places. I'm retired out of the aviation maintenance and learned the manufacturers are very specific on this as far as what type and where it is used,the idea if a little is good then a lot should be better is left for the 'other guys' who don't get it. I'm pleased you have got this figured out for your guns. Thank you for sharing, hopefully some one will read this and think,hey, that might be a problem they are having and don't realize it.. Bill
 
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