New start

**Nr1madman** · 25-03-2018

Originally Posted by Desertboy

Relay(s) to turn your NO to NC would do the trick with an added layer of complexity or order NC sensors from china and slum it for a few weeks with the ones you have.

3rd option run as is probably be fine lol.

I know that if I start running with this it will never get changed :D
Limits will go through relays but I've read that homes should get connected without relays or logic circuits to get the best repeatability? :)

I feel so close now!!

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**Desertboy** · 25-03-2018

Originally Posted by Nr1madman

I know that if I start running with this it will never get changed :D
Limits will go through relays but I've read that homes should get connected without relays or logic circuits to get the best repeatability? :)

I feel so close now!!

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I think if you use Solid state relays it's not an issue as they switch a lot quicker.

But just buy new switches is the proper solution and obviously what you're thinking, you can still play without home switches.

https://www.aliexpress.com/item/5pcs...724076488.html

Aren't these the same switches but NC?

**Nr1madman** · 25-03-2018

Originally Posted by Desertboy

I think if you use Solid state relays it's not an issue as they switch a lot quicker.

But just buy new switches is the proper solution and obviously what you're thinking, you can still play without home switches.

https://www.aliexpress.com/item/5pcs...724076488.html

Aren't these the same switches but NC?

I guess you are right!
Im so sick of soldering and shrinktubes and that crap.. hoped I was done :D
Swedish post has introduced a new fee for packages that come from outside of eu.. so ordering from China will get expensive from now on.
Except for VAT there will be an extra charge for every package. Think the smallest charge was around 7£.. This takes away the freedom of just shopping cheap stuff.

Anyway :D
Will have a play tomorrow and try to make sense of pulses/mm.
Had it at 160 at the moment but didn't seem quite right.

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**JAZZCNC** · 25-03-2018

Originally Posted by Nr1madman

Have tried my HOMEs now. Signal is high unless any switch is triggered.
This works but should a wire fail Im in trouble as I'm connecting 3 axis paralell to one input?

The slaved axis with separate input is safe because I would notice a broken wire?

If Just home switches then don't worry about it because if one fails the Limits will catch it.

**Nr1madman** · 25-03-2018

Originally Posted by JAZZCNC

If Just home switches then don't worry about it because if one fails the Limits will catch it.

I'm comforted now... thanks ;)

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**Neale** · 25-03-2018

Originally Posted by Nr1madman

I'm comforted now... thanks ;)

...as long as you use the NC contacts for the limit switches! Simplifies wiring as well as they can all be in series taken to a single BOB/motion controller input pin. I use proximity switches myself; mine are arranged in pairs (min/max limits on each axis) and wired in "series". Doing that is slightly more complicated than with mechanical switches but it works fine. I tested them with 4 in series (remembering that I also use 24V) and they seemed to work OK as well.

**Nr1madman** · 28-03-2018

Alright :D

First test cut made!

Was a bit of difficulties at first.
Got spindlecontrol working at first but with mayor problems.
Estop was tripping and uc300 was loosing connection from computer.

Disconnected speedcontrol from bob and ran only the start relay. Worked better!
Then when I started jogging the machine with spindle on I got false e stop again :(
Disconnected e stop from bob and only had it to control master relay.
Got the problem that when jogging two axis simultaneous uc300 disconnected.
I think the problem is my 5v psu so I hijacked 5v from my pc psu and ran to uc300 so that got powered from pc and the bob/driversignals from separate 5v psu.

This made it work :D :D

I have not reconnected spindle speedcontrol but Im guessing that works now too..!
Homes are working but my slaved axis (x/a) needs a bit calibrating. When cutting a grid of 300x300mm I get about 1mm differens in the diagonals. But there is plenty of adjustment available in the home sensor brackets so it's no biggie :D

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**Desertboy** · 28-03-2018

Congrats on getting her going, everyone cuts a circle lol.

My first circles were off by about 1mm I read a post by Jazz about rising/falling edge so I flicked the jumper (No. 8 on my AM882) and now the sizes are correct.

Here's Jazz's post
http://www.mycncuk.com/threads/4513-...9450#post99450

**Nr1madman** · 28-03-2018

Originally Posted by Desertboy

Congrats on getting her going, everyone cuts a circle lol.

My first circles were off by about 1mm I read a post by Jazz about rising/falling edge so I flicked the jumper (No. 8 on my AM882) and now the sizes are correct.

Here's Jazz's post
http://www.mycncuk.com/threads/4513-...9450#post99450

Hmm have read about that a couple of times.
Have to try it and see if there is accumulation.
But for it to be real obvious I should write a program that takes the axis back and forwards ALOT of times to see if the position changes? :)

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**Nickhofen** · 28-03-2018

Maybe the amperes are not enough from the PSU 5v for powering both the UC300 and Bob that is why you solve the problems when you get your 5vokts from two different power supply ...just a thought.