Quote:
Originally Posted by nitro1
Dynamo is right you do only need one bearing. Just on the guide. The piston is jamming on full compression because there is not enough room in there.
I have seen this plm tonnes of times. HOPE IT WORKS OUT FOR YA CHEERS.
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I'd normally point this out as well as a possibility....but if the mechbox has sucessfully shot ("...it shot three times and then locked up...") already, then it's highly unlikely that there isn't enough room for the spring to compress. It'd jam on the first shot.
I do agree with Dynamo's and your comment of a single bearing stack...but I've seen/done plenty with bearings on both ends. Depends on the spring.
Below are somewhat-wild-ass-Internet-guesses....
It's locking up at the rear of the stroke...where spring pressure is at it's max. So additional power (i.e. larger battery, stronger high-torque motor, torque up gears, etc...) might power through that resistance and it'd shoot "normally". If you stick in a strong motor and hook up a good fully charged 8.4v large battery...it should easly pull that spring. If it locks up...you've got a physical interference problem.
Try only testing after you reset the mechbox with a fully charged good large battery and semi auto only
Or there's some drag/catch that it's hanging up on (i.e. shimming is a little tight, piston is rubbing a little hard somewhere, spring is physically binding). Guessing.....With a charged battery at rest...the pack puts out a good burst of power to push through that resistance (with that motor). When drained a bit (i.e. during the burst) the power drops off and the motor can't torque through the resistance. If it looses momentum at a fully compressed/slightly jammed position...it probably won't do anything regardless if you try a fresh battery or not. But most times that I've seen it lock up immediately or after just a few shots....it's a spring/spring guide/piston body fitment issue.
Best of luck,
Tys