While this might not be much of a concern to you guys who shoot high power, the action noise on my impact drives me nuts. The floating a hammer spring guide, the rattle of the hammer inside the block and as the hammers wobbles about on the valve stem makes the gun feel and sound (sorry for this FX) both cheap and nasty. The gun is not loud but compared to the noise (or should I say lack of it) of my other guns, the impact sounds like a tool box full of spanners.
So, last night I took the gun apart and had a look to see if I could make improvements? The first thing i noticed was how loose the spring guide was inside the spring, how loose was the spring inside the hammer and the bore of the hammer was 4mm while the valve stem is only 3mm. All of these cause rattles. After a bit of measuring I realised I could turn up some new PTFE parts that were not only made to tight tolerances but they would effectively stop all unnecessary metal to metal contact.
I replaced the delrin floating spring guide with one made from ptfe, which is slightly heavier, much less friction and softer so even if it does rattle it’s not as loud.
I also made a top hat for either end of the spring that holds it 100% central to the valve stem so the hammer moves exactly the same each time. The guide (right) pushes into the hammer reducing the bore from 4mm down to 3.2mm, the hammer now slides slicker than snot with almost no wobble.
I also made a sleeve to fit inside the valve return spring (uk spec) again to reduce slope and metal to metal contact.
so, this morning I set it up and WOW, the difference is huge! Not only soooooo much quieter, less vibration and more consistent over the chrono.
Its still not as quiet as my quietest gun but it is not far behind.......well pleased it now feels like the gun it should be
Bb
So, last night I took the gun apart and had a look to see if I could make improvements? The first thing i noticed was how loose the spring guide was inside the spring, how loose was the spring inside the hammer and the bore of the hammer was 4mm while the valve stem is only 3mm. All of these cause rattles. After a bit of measuring I realised I could turn up some new PTFE parts that were not only made to tight tolerances but they would effectively stop all unnecessary metal to metal contact.
I replaced the delrin floating spring guide with one made from ptfe, which is slightly heavier, much less friction and softer so even if it does rattle it’s not as loud.
I also made a top hat for either end of the spring that holds it 100% central to the valve stem so the hammer moves exactly the same each time. The guide (right) pushes into the hammer reducing the bore from 4mm down to 3.2mm, the hammer now slides slicker than snot with almost no wobble.
I also made a sleeve to fit inside the valve return spring (uk spec) again to reduce slope and metal to metal contact.
so, this morning I set it up and WOW, the difference is huge! Not only soooooo much quieter, less vibration and more consistent over the chrono.
Its still not as quiet as my quietest gun but it is not far behind.......well pleased it now feels like the gun it should be
Bb