FX Impact X Hammer and Spring Specs + Huma Regulator Problem

Jump to latest Follow Reply
Hi Heavy Impact. Try less washers on you Huma not more. Also empty your bottle on the gun and fill very slowly to start from your fill station. 

The hole that goes through the piston on the huma is on the side of the piston. If it is pushed down by the air pressure before air gets into the regulated side to push the piston into the housing the hole on the side will end up under the last oring and you’ll get no reg pressure. Make sure when you put it in the gun the piston is as far into the housing as possible. Also just tighten it down a ’twick’ more.

Hope that makes sense 🥴

Michael
Click to expand...

I understand and thanks for the help. Any less than 14 washers lets the piston out of it's bore in the gun. In other words, when I have 12 washers the piston comes out of it's bore at 110bar. When I use 13 washers the piston comes out of it's bore at a hair over 150bar. Since my newer Impact came with the 18mm piston regulator and 16 washers, I have to use at least 14 washers. Huma needs to add 3mm to their piston for the newer guns and have another part number. The FX regulator still creeps over 30 bar, even with the washers in the HP configuration. I'll work on the Huma setup again soon. Right now I'm trying to wrap my dusty old mind around CAD design and printing some prototype doodads for the Impact.
 
Upvote 0
30 bar is a LOT of creep. Does it creep that much when you fill say only 30-50 bar over regulated pressure? I get maybe 5~% creep on my Lane Regulator when I am filled near max, but when closer to reg pressure I get next to no creep, mid fill would be around 2.5~% creep max. The creep is really only noticeable on my really low fps tunes but still within reason. Huma or Lane regulators are the way to go IMO!
 
Upvote 0
30 bar is a LOT of creep. Does it creep that much when you fill say only 30-50 bar over regulated pressure? I get maybe 5~% creep on my Lane Regulator when I am filled near max, but when closer to reg pressure I get next to no creep, mid fill would be around 2.5~% creep max. The creep is really only noticeable on my really low fps tunes but still within reason. Huma or Lane regulators are the way to go IMO!
Click to expand...


I didn't check when the pressure was low, I just filled it to 250 and noticed the next day. I'll be trying to get the Huma working again tonight, I'm sure the problem comes from the short piston though.
 
Upvote 0
Hi Heavy Impact. Try less washers on you Huma not more. Also empty your bottle on the gun and fill very slowly to start from your fill station. 

The hole that goes through the piston on the huma is on the side of the piston. If it is pushed down by the air pressure before air gets into the regulated side to push the piston into the housing the hole on the side will end up under the last oring and you’ll get no reg pressure. Make sure when you put it in the gun the piston is as far into the housing as possible. Also just tighten it down a ’twick’ more.

Hope that makes sense 🥴

Michael
Click to expand...

I understand and thanks for the help. Any less than 14 washers lets the piston out of it's bore in the gun. In other words, when I have 12 washers the piston comes out of it's bore at 110bar. When I use 13 washers the piston comes out of it's bore at a hair over 150bar. Since my newer Impact came with the 18mm piston regulator and 16 washers, I have to use at least 14 washers. Huma needs to add 3mm to their piston for the newer guns and have another part number. The FX regulator still creeps over 30 bar, even with the washers in the HP configuration. I'll work on the Huma setup again soon. Right now I'm trying to wrap my dusty old mind around CAD design and printing some prototype doodads for the Impact.
Click to expand...

Ok. I miss understood your problem. I thought you weren’t getting regulator pressure. Hope Huma can give you a solution. 
 
Upvote 0
Ok. I miss understood your problem. I thought you weren’t getting regulator pressure. Hope Huma can give you a solution.
Click to expand...

No you're right, I'm not getting any air with 14 washers. I've emailed Huma and explained that the only right way to fix this is to make longer pistons for the newer guns. They suggested that I put some sort of spacer in the bore for the regulator piston to hold the piston far enough inside the regulator to get it started. I don't want a bandaid on their problem, I want them to fix it right. They will simply have to provide longer pistons for the newer guns. I'm sure Huma will do the right thing.
 
Upvote 0
I got the Huma regulator working again buy putting a piece of a spring from a ball point pen under it. This is only a temporary fix and I want Huma to send me the correct length piston.

1543723517_14540863055c0359fd8d5796.84763128_huma problem 1 - Copy.jpg


The Huma piston needs to be another 1 to 2 mm longer to function reliably in guns that came with the 16mm regulator piston. Due to the necked down small end of the huma piston, when you add the correct number of washers 14, the piston gets pushed far enough out of the regulator body that the internal o-ring covers the air holes at the small end of the piston and won't let any air pass when starting from zero pressure. The spring I added keeps the internal o-ring from pushing the piston out too far before you pressurize the gun.

1543724326_10745189755c035d26caabd2.51319665_huma problem 2 - Copy.jpg

 
Upvote 0
Yep and then your 250bar pushes the piston hard into the trigger block. . Other thing to watch is the oring that seals the housing on the huma isn’t as thick as the original fx oring. You must use the huma oring If you swap that oring for the original fx oring the housing won’t go far enough into the trigger block. So this will also create the same problem. 


 
Upvote 0
YES!!!! I have spent the last several days working through and figuring out this exact same thing. I thought I was loosing my mind, and could not figure out what was going on for some time. Please post any response you receive from HUMA. I will contact them as well so they see this happening to more people. Thanks!
Click to expand...


Huma is working on this problem. They told me I was the only one but I knew others would have problems. When you contact them please link this thread. They are trying to help and are sending me parts to try. In my opinion this problem is going to take a slight redesign with a longer piston. There is no reason not to because the regulator sits in there so deep there is plenty of room to make one regulator that will work with old and new Impacts. If the regulator needed to be longer it would still fit with ease. I don't want a delrin spacer in there to replace my spring work around. I want a proper design that functions as intended.
 
Upvote 0
Please keep us updated.
Click to expand...


Sorry about the delay. I have a very slow leak at the regulator gauge and had to wait a few days for washers to come in. After the new washer it still has a slow leak so I put some sealant on it and want to let it cure completely before pressurizing. I think I may have scratched the bottom of the bore for the reg gauge causing the leak. I'll post an update as soon as I get it sorted.
 
Upvote 0
Here are the FX impact X hammer and spring specs for those who like to modify. These specs were measured from my .30 Impact X but I'm sure they are the same for all standard power calibers.

1542869966_13282335375bf653cef2f859.62843761_Impact H&S -.jpg
Click to expand...

Hi Heavy...I am in a diving and studying mods mode right now ...;) thanks for sharing all this

In this measures I miss the rod hole of the hammer on the smaller part diameter, or the ID of the short and smaller part of the hammer (I will measure mine of course but just in case you have it in hand)

Also what do you think is best, add a heavier spring? add a hammer weight guide or to add a Heavier hammer (25-26grams)? 
 
Upvote 0
Hi Heavy...I am in a diving and studying mods mode right now ...;) thanks for sharing all this

In this measures I miss the rod hole of the hammer on the smaller part diameter, or the ID of the short and smaller part of the hammer (I will measure mine of course but just in case you have it in hand)

Also what do you think is best, add a heavier spring? add a hammer weight guide or to add a Heavier hammer (25-26grams)?
Click to expand...

4mm for the valve rod hole.

The spring is strong enough. The spring guide design above adds to the hammer weight same as having a heavier hammer so the spring guide is the simplest path.
 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu