Its not 8 switches. I just was goofing around on the digi key online free curcut plotter. It keeps going to next number even if you delete a component.

4 switches will do it

Auto Cycle
End of cycle/ reverse
Stop (home)
Panic (stop and go home)

The other 2 were there for manual jog on the tubing bender I'm stealing it from

 

OK, I looked at the rapido loco splitter. No offense, but home brewing the control for something like that seems somewhere between a touch crazy and full on bat-shit crazy. $200 looks cheap after seeing that video.

 

This one is chainsaw bar for cutting. No a 60" slasher blade. I'm crazy not insane.

It's really a bacic control in the grand scheme of things. Much simpler that some old stuff I've come across using motor contactors and mechanical interlocks. Don't get hung up on what it's attached to. Could be the solenoid valve. A linear actuator or a DC motor. Curcut doesn't care lol.

As for why thyristor over realy again. Cheap... and no contact points to melt.

 

Two P.B. , one for e_stop.
1 D.P. L.S. (fwd)
1 S.P. L.S. (rev)
3 D.P.D.T. Relays. (e-stop) (fwd) (rev).
Max.

 

It basically me being cheap. Figure I can make these 2 boards and house them in an ammo box for $50...

The the 2-relay circuit I posted earlier strike you as being expensive?

As for why thyristor over realy again. Cheap... and no contact points to melt.

if you've had contacts melting then the problem is most likely lack of snubber and/or flyback diode. These are things you will need for transistor circuits or relays. Transistors will fail the first time you energize the solenoid with not flyback protection. Relays will last a lot longer with no protection.


Relay circuits are more reliable. How much do you think a relay costs anyway?

 

Also evidently they are pilot operated valves so the current should not be that high.
Max.