Pneumatics

[woody]

Pneumatics

Stuck as in never comes down or stuck till pressure builds back up and then eventually becomes unstuck?
Minimising all the Ts by using a manifold and adding a bigger buffer should certainly help.

Why 6mm return ? ...it might be a flow restriction and could cause excessive back pressure and slow your Axe/Flipper.
Do you use QEVs and lower pressure return on the flipper?

(Message edited by woody on October 12, 200

[widow_twanky]

Pneumatics

Stuck as in till the pressure builds up.

I am assuming that increasing the pipe sizes to the returns will actually make little difference except to affect the speed when the pressure does eventually build back up?

Andy

You can see it here:

http://www.youtube.com/watch?v=4UDmzHDbVY4http://www.youtube.com/watch?v=4UDmzHDbVY4 if you need it pointing out, just wait till you hear Luke shout its twitching!! and youll see what I mean.

This appears to have been a problem in Hydra form the start. You can see it happening here:

http://www.youtube.com/watch?v=YL8HCwu4Lqshttp://www.youtube.com/watch?v=YL8HCwu4Lqs

Andy (OK I accept I have no life if Im watching videos to find out whats wrong) S

[widow_twanky]

Pneumatics

Sorry Woody, guilty of not reading your posts again!

6mm return is what has always been there and its been left alone till Ive been happy to do some major surgery (Time and confidence)

6mm return has a qrv attached to the ram so shouldnt slow down the flipper or axe on the way down. Flipper return is 10bar (as main system) but smaller tube.

The smaller tube is needed as its flexible enough to take the route from the 5/2 valve to the top of the ram and move with the ram.

Would a qrv on the bottom of the ram be a sensible idea if the buffer doesnt work? this I assume would reduce any back pressure on the return stroke.

Andy

[woody]

Pneumatics

A QEV on the ram base isnt needed or wanted...your problems seem to be purely down to a lack of pressure in your buffer tank.
Are your 5/2 valves Solenoid/Spring or Solenoid/ Solenoid?

[widow_twanky]

Pneumatics

Dunno Woody, Ill have a rummage round inside Hydra and see what I can find out.

Suppose I should find out if it is purely a buffer issue at Nottingham, so Ill wait till then. Will probably put the manifold on anyway as it seems a good idea.

Andy

[woody]

Pneumatics

Solenoid / Solenoid valves will have a coil each end ...Its possible... if you have this type.. for the valve to stay open till enough pressure is built up to operate the return of the internal spool....thus the ram stays open till minimum operating pressure is attained.
A solenoid / spring type doesnt suffer from this problem as the spring returns the internal spool.
Having said that solenoid / spring valves wont solve the actual problem you appear to have of low buffer tank pressure.

Woody

[widow_twanky]

Pneumatics

In that case theyre solenoid spring valves. As Ive put the 2.5kg buffer in (was 1kg) hopefully thtatll see an end to the problem.

Andy