Quote:
Originally Posted by GrieverX
I remember reading somewhere that you are only supposed to have bearings on one end of the setup, either the spring guide or the piston head or else your gearbox might be prone to a lockup/piston losing teeth.
Not sure if that is applicable in your situation, but can anyone tell me if there is any truth in that idea?
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There are plenty of room to both having a bearing in both the piston head and on the spring guide, hell you can even fit a spring tensioner on the spring guide to with out running in to problems. In the 8 years I have done airsoft mechanics I have never seen a case where a failure was caused by inadequate room for the spring under the piston backward stroke.
You do however only need a bearing in one end of the spring, to allow it to rotate freely under compression and decompression. Leaving one of the bearings out of the system will leave less tension on the spring while it is fully compressed resulting in less muzzle velocity. The effect is the same as making a short stroke setup with 2 teeth removed, in terms of velocity sacrifice. By leaving the piston head bearing out, you get a lighter piston assembly, resulting in less stress on the gearbox from the pistons forward stroke. Also the lighter piston assemble also results in a slightly increased ROF. However do note that for low power setups you gain muzzle velocity from a light piston assembly where as the effect are the other way around for high power setups where the hard rapid compression of air in the cylinder puts so much resistance on the piston that you need a heavy piston assembly to achieve maximum muzzle velocity due to the pistons higher inertial energy. The turnover point is around the M130 springs mark. Practical experiences with high power setups shows, that passing M160 does not result in better accuracy or range and the wear on the gearbox gets so extreme that it is not worth playing with (at least when it comes to ver.II boxes). Personally I have only used M150 springs so the experiences are of others.