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Bar1975 · January 3rd, 2013, 20:05

ok.. got with the 21st century

The black piston below is the first set up with high speed motor. This didn't last much more than 100 shots on semi and full auto (full auto streams for a few of seconds)

The first two teeth were removed for AOE.

Note the cracked off pick up tooth and the stripped teeth. Looks like the sector was engaging those later teeth first as the piston was on it's way back?

The second piston (white) is the second set up. High Torque motor (both set ups used 9.6V battery) AOE was corrected but after several hundred shots (semi and full auto streams for a few seconds) i started to hear a different sound and felt something was happening. I stopped and opened the gearbox to find this.

Harder to see but note the shredding of the same teeth as the piston above. The pick up tooth was still in tact but probably not for long. This piston was not swiss cheesed either.. the black one was. (this may not have happened if Swiss cheesed)

At the end of the day the damage to both is similar enough to point to the same cause. If it's per-engagement then it will continue to happen to any new piston i place in here.

Recommendations so far have been to increase the string strength so I'll grab an M120 as i don't want to have to replace the motor with anything higher than the 120. I'll pick up a new nylon fiber piston and do the same AOE and swiss cheesing mods.

My question remains around short stroking this new set up? Will short stroking guarantee a fix for this issue? If i start without this i could end up stripping the new piston so it makes sense to remove a tooth or two just to cover all possible angles here?

January 3rd, 2013, 20:05	#19
Bar1975 Trader rating Join Date: Aug 2012 Location: ON	ok.. got with the 21st century The black piston below is the first set up with high speed motor. This didn't last much more than 100 shots on semi and full auto (full auto streams for a few of seconds) The first two teeth were removed for AOE. Note the cracked off pick up tooth and the stripped teeth. Looks like the sector was engaging those later teeth first as the piston was on it's way back? The second piston (white) is the second set up. High Torque motor (both set ups used 9.6V battery) AOE was corrected but after several hundred shots (semi and full auto streams for a few seconds) i started to hear a different sound and felt something was happening. I stopped and opened the gearbox to find this. Harder to see but note the shredding of the same teeth as the piston above. The pick up tooth was still in tact but probably not for long. This piston was not swiss cheesed either.. the black one was. (this may not have happened if Swiss cheesed) At the end of the day the damage to both is similar enough to point to the same cause. If it's per-engagement then it will continue to happen to any new piston i place in here. Recommendations so far have been to increase the string strength so I'll grab an M120 as i don't want to have to replace the motor with anything higher than the 120. I'll pick up a new nylon fiber piston and do the same AOE and swiss cheesing mods. My question remains around short stroking this new set up? Will short stroking guarantee a fix for this issue? If i start without this i could end up stripping the new piston so it makes sense to remove a tooth or two just to cover all possible angles here?