Tech Spam thread - because 1/4" BSP gets 5 hand spans to the jiggawatt

[Nominal]

I'm going to put the carter one in and send it, need the car running / legal.

[440bbm]

sounds like the best plan.  unless its a rev monster and its well over 350 hp wont need more than 20-25gph anyway

i had in my mind the larger body ones are higher psi mostly. not just volume 

[shrike]

Anyone know where to get Stainless 3/4" Male BSP to 5/8" BSP female adapters?

[ThePog]

 

1 hour ago, shrike said:

Anyone know where to get Stainless 3/4" Male BSP to 5/8" BSP female adapters?

Anzor probably 

https://www.anzor.co.nz/bsp-npt-fittings/bsp-reducers/reducing-bush

 

[NickJ]

Does 5/8 fit in 3/4? sounds like a custom fitting rather than bush?

[HumberSS]

10 hours ago, shrike said:

Anyone know where to get Stainless 3/4" Male BSP to 5/8" BSP female adapters?

I'd be busting out the tig

[shrike]

3 hours ago, NickJ said:

Does 5/8 fit in 3/4? sounds like a custom fitting rather than bush?

3 hours ago, HumberSS said:

I'd be busting out the tig

It may be custom lots of options for 3/4" bsp  to 1/2" bsp

Might have to drill a 3/4" to 1/2" adapter out and retap need a 21mm hole to tap 5/8" bsp (22.99mm) 1/2" is 20.99mm so only 2mm smaller

3/4" bsp is 26.44mm 

Need to see if I have a tap that will work.

I've got some quick release fittings that are 3/4" male to 5/8" male that I'd like to be male to female. To buy the same complete fitting in the female option its 17.5 each and I need 6 of them. 

3/4 to 1/2" bushings are about $2 each and worse case a taps $40 so I'm still ahead 

Don't want to use a 3/4" female to female as can't add length 

Edit Actually that won't work

What I have on the left and what I need on the right 

Guess I'll bite the bullet and buy new fittings 

[Nominal]

Sorted!

 

[ThePog]

I want to activate a relay, but I only want it to close the circuit when another circuit is broken.

ie I only want the second circuit to run when a limit switch has disconnected the first. 

But I dont necessarily want the second coil to be energised all the time.

Is there a devious way to achieve this passively?

[NickJ]

Can you substitute a different switch in?

 

[ThePog]

22 minutes ago, NickJ said:

Can you substitute a different switch in?

 

Not really, it has a limit switch that breaks the circuit once in position. I need to use the break as the ok go signal for the next thing.

[NickJ]

Thinking a spdt switch could then power the relay when opened?

[h4nd]

Sounds like Nick might be on to it with DPDT? Use one NC to common terminal to open at limit, then the other common to the other NO terminal, which closes to enable your 'next, Go!' signal? Or 2x SPDY limit sw if they don't do DPDT?

Of course, if you supply full cad drawings and all your Arduino code, I pinky promise I won't steal them and get zillions made in China

Oof. I did a reading fail. How much coil current becomes a problem? Is 10mA for an SS relay too much?

Also, I think there are set/reset relays that only consume energy at change?

[h4nd]

Ah, run your relay off the NC terminals of the limit sw for the first stage parallel to the motor, so it switches off with the motor at the limit, then you have the NC terminals on the relay will relax closed, to drive the next thing. You'll have those NAND/NOR/1 bit sadder gates going in no time!

[h4nd]

 

[ThePog]

50 minutes ago, h4nd said:

Ah, run your relay off the NC terminals of the limit sw for the first stage parallel to the motor, so it switches off with the motor at the limit, then you have the NC terminals on the relay will relax closed, to drive the next thing. You'll have those NAND/NOR/1 bit sadder gates going in no time!

This is so obvious I am smacking my forehead.

[h4nd]

Oh good, I understand the assignment (eventually)

[kws]

Doing the rear wheel bearing on the Marina, do I need to drain the diff first? It's a borgwarner diff, similar to what's in escorts, capris, Datsuns of the time.

[Carsnz123]

You will probably get a little oil come out that's sitting in the axle tube but the main oil level should be below the axle tubes.

[ajg193]

Could always just prop up the one side so the oil isn't there