This may be helpful. The nut on the shower outlet is a bit random though, so we might need to do a bit of digging to get something useful. Alternatively, machine something more suitable somehow.
Should be standard
my memory is that it isn’t though…
this is the (eyewateringly expensive) kit that it would be:
https://www.astonmatthews.co.uk/taps/productdetails.asp?1353,0,0,28,3
But that looks like the standard 1/2 inch plumbing connection. They’re all the same.
We don’t really want a normal shower head but a garden one with a trigger and adjustable pressure/range
in theory? Assuming that the thread is a 1/2 inch. I’ll confirm tonight.
That’s for a 3/4" thread, such as can be found on an outdoors tap.
meh. me no understand pipes and threads.
1 Like
This should be more like it
Bring it in I have one kicking around somewhere
We could probably do with one of them auto shut off ones ?
Back to the topic ! Lol
We now have two requirements for a 3 phase power switch and brake system.
Thinking out loud @joeatkin2, is this what you were thinking ?
Pic or Atmel board controlling 3 phase contactors / solid state relay for motor run, with the start stop also under process control.
Board also acting as sequencer to bring in the brake circuit via its own transistors/relay and shut off once everything/motor is stationary.
Board could also do RFID and auth for machine use ?
Courty
Contactors must be interlocking and we already have them , starting and stopping should be under relay control so software faults can cause phantom start.
Must be compatible with contacters with random coils so cheaper ones can be used.
Should not be part of the tool control so no one will need to tamper with it
Should be able to ramp the dc up and preferably detect shaft speed so it can detect a fault
Must be more reliable than anything available on the market
1 Like
And must be extortionately cheap .
1 Like
How big has to be the transformer?
Primary 415V
Secondary 12 to 30V
VA???
1 Like
Primary 230v surely?
Although it’s 3 phase and 400v between phases, it’s still 230v from a phase to neutral so a standard 230v transformer will do.
If it needs 4A at 24v to brake properly we need about 100va output I believe
Courty
2 Likes
Where should we be looking for these? If we’re looking for them.
Of course 230 to 12v is common, can you use pairs of these to make 24v with primarys in parallel and secondary in series?
(Which leads me to another question: can I do that with SMPSs? I have a headphone amp that needs 24v… Was wondering about sticking two 12v ones in a plug and putting outputs in serial? Do most modern power supplies act as stable voltage sources?)
24v systems are quite common so shouldn’t be a problem to source.
Switched should be fine with the main caveats being they are not simple and probably won’t like getting dusty…
While I theory you can daisy sm’s, I’m not sure it’s a great idea…
Courty
1 Like