Build and Intro

[m_c]

Regarding the limit switches, have you checked with a multimeter what reading you're getting at the BOB?

I've just had a quick look at a photo of the bob, and with the switched not actuated, the voltage between the two connectors should be near 0V.

[swisscheese]

Regarding the limit switches, have you checked with a multimeter what reading you're getting at the BOB?

I've just had a quick look at a photo of the bob, and with the switched not actuated, the voltage between the two connectors should be near 0V.

I get 5 volts at the break out board. Have virtually tried every combination now. Even just doing the one z axis switch it still works intermittently or not at all. Just so I'm doing it right. I put one wire in first z limit terminal, run it to switch, run second wire back to second terminal from switch. Now there is a closed circuit. When switch is hit circuit opens. Have tested all with multimeter and all works as it should. Not sure where to go from here. Have tried 'invert' in linux setup also.

Heres a vid, notice only two axis running, third done by hand

DIY CNC router - YouTube

[m_c]

Just measuring voltage at the terminals, does the voltage change when you actuate the switch?

[EddyCurrent]

Does the limit switch problem occur when nothing else is powered up on the machine i.e. spindle not running, stepper motors not running ?
If the answer is yes then it sounds like a bad connection or a faulty switch, if the answer is no then you may be getting induced voltage into the limits wiring.
Sorry if this seems too basic but I have seen these giving bad connections in real life situations; wires pushed too far into terminals so screw grips insulation, wire that looks like it's 'bare' but has a coating of clear lacquer, badly soldered joints that connect intermittently, wire where the insulation is intact but the metal core is broken, terminals that are tight but the wire has been inserted incorrectly (it missed the hole) and is not being clamped.

[swisscheese]

Does the limit switch problem occur when nothing else is powered up on the machine i.e. spindle not running, stepper motors not running ?
If the answer is yes then it sounds like a bad connection or a faulty switch, if the answer is no then you may be getting induced voltage into the limits wiring.
Sorry if this seems too basic but I have seen these giving bad connections in real life situations; wires pushed too far into terminals so screw grips insulation, wire that looks like it's 'bare' but has a coating of clear lacquer, badly soldered joints that connect intermittently, wire where the insulation is intact but the metal core is broken, terminals that are tight but the wire has been inserted incorrectly (it missed the hole) and is not being clamped.

m_c and Eddy I will go and check these when I get out and report back.

cheers

[swisscheese]

EDDY I can confirm that the switches work as they should when there is no power going to the stepper motors. I'm guessing I have to now re wire switching wire with shield wire of some kind??

thanks

[swisscheese]

Man its been a while since I've been on here. Time for some pics!
Overall I'm pretty happy with how the machine runs, especially seeing as I made it with zero plans/planning, a big no no on here haha. Haven't had any major problems and once I received the new driver everythings been sweet. Still haven't wired up any limit switches, I'm lazy.


Some videos

DIY CNC Router Flush Handle - YouTube

DIY CNC router pocket - YouTube


Here's a few things I've been making....

[GEOFFREY]

Great stuff. G.

[AndyGuid]

Man its been a while since I've been on here. Time for some pics!

Overall I'm pretty happy with how the machine runs, especially seeing as I made it with zero plans/planning, a big no no on here haha. Haven't had any major problems and once I received the new driver everythings been sweet. Still haven't wired up any limit switches, I'm lazy.

Here's a few things I've been making....

I had the pleasure of meeting swisscheese and his machine on Thursday.
Many Thanks swisscheese, the viewing and rundown of your build was much appreciated. I hope I don't bug you too much into the future.... Although having said that..... have you machined aluminium plate with your machine yet? ;-)
The half-tone furniture you've produced is not done justice by these pictures.... I found them far better in real life.... quite stunning really!
Cheers,
Andy

[swisscheese]

Hi,

I have done some aluminium work with the machine. I will put a photo up of a gear I cut out when I get the chance.

Here is a video of it cutting alloy. This is when the z axis wasn't fully working so it was being moved by hand.

DIY CNC router - YouTube