Peddle conversation

[Mark_Mark]

Here is a simple pneumatic single stage. I can only imagine the amount of spilled powder if it were connected to a progressive. Watch for the shadow created when all the debris on the table top jump up as the case is pulled out of the die!

that is one noisy reloading room! jezzzzz, get a shop air

 

[PWC]

Watch for the shadow created when all the debris on the table top jump up as the case is pulled out of the die!

Is that caused by no lube on the case getting stuck (maybe ram travel is too long), or by the pneumatic ram reversal?

 

[jmorris]

AIt’s the air compressing to a level high enough to force the case out of the die, that that point there is no resistance and the pressure forces the ram down all the way instantly as the volume expands and pressure drops.

The reason hydraulics don’t do that is the liquid they use is much less compressible than air. It’s for this reason they test compressed gas cylinders with liquid and not air. Lots less drama in the event of a failure.

That pneumatic can crusher I posted on the last page even has “flow control” valves but still suffers from the same issue, just not as bad. You can get them pretty good with proper sizing, regulators, flow control and such but they do get more complicated.



You can also go way up on cylinder diameter, as well as limit air flow.

 

[Blue68f100]

Since air is compressible, the stroke will not be smooth due to varying load, pressure not constant. The reason hyd is the preferred method.

 

[Alliant Reloading]

MEC has both hydraulic and electric progressive shotshell presses.
I have a 9000E electric drive that is pretty nice.
https://www.mecoutdoors.com/9000e-with-auto-mate