What Limit Switches?

[Neale]

Not absolutely sure. These specifically say "iron sensing" or somesuch. Because I don't have the original listing for mine, I can't say what they are. Proximity switches are sometimes iron only, sometimes anything metallic (although with reduced sensitivity, as I understand it). Mine certainly trigger on aluminium. Of course, if your trigger component is iron or steel, then that's not important.

[Chaz]

Not absolutely sure. These specifically say "iron sensing" or somesuch. Because I don't have the original listing for mine, I can't say what they are. Proximity switches are sometimes iron only, sometimes anything metallic (although with reduced sensitivity, as I understand it). Mine certainly trigger on aluminium. Of course, if your trigger component is iron or steel, then that's not important.

Ive ordered 3 of them to test and see. They should be fine.

Thanks

[Kardacian]

Ive ordered 3 of them to test and see. They should be fine.

Thanks

Would you consider using Hall Effect sensors? No moving parts extremely accurate and will outlast mechanical switches. Take a look at these, they run on 5 Volts but I can modify to use higher voltage if needed. They operate in the same manner as a NO switch. However a NC can also be created and will not be expensive.

https://www.tindie.com/products/Kard...ll_prod_search

[Boyan Silyavski]

Would you consider using Hall Effect sensors? No moving parts extremely accurate and will outlast mechanical switches. Take a look at these, they run on 5 Volts but I can modify to use higher voltage if needed. They operate in the same manner as a NO switch. However a NC can also be created and will not be expensive.

https://www.tindie.com/products/Kard...ll_prod_search

Great but 5v and not shielded = Problems

[Kardacian]

Great but 5v and not shielded = Problems

The voltage problem can be solved easily, what voltage do you need to support. I run these without shielding and have had no issues. What would be an ideal shielding for your environment?

[m_c]

Great but 5v and not shielded = Problems

That's actually a bit of a generalisation, as it depends on exactly how you're powering things. I keep meaning to do a post on the why and how the problem can be mitigated to a certain extent.

Regardless, IMO limit switches should always be fail safe I.e. NC, as you want to minimise the risk of a wiring fault causing the switch detection to fail.
Plus, magnetic switches on something that could potentially be machining steel?

[cropwell]

Great but 5v and not shielded = Problems

biggest problem for me is the delivery charge !

[Neale]

I see Hall effect switches mentioned more in US sites than UK. I'm not sure why you would use these rather than the Chinese-sourced proximity switches, unless you are in an environment where there is a lot of metal around and powerful magnet operation is desirable to avoid false triggering. For example, the proximity switches run natively on 24V. Is it really that there is a strong "not from China" feeling in the US rather than any pure technical reason? Just curious - I've a box of proximity switches in the workshop that I am using, so I've already made my design decision

[JAZZCNC]

No Brainer to me Chaz.? . . . .The IP-A gives abilty to Home To Index so use it because will be superior to most SW and very repeatable.
Also means don't need expensive switches for there repeatabilty/reliabilty. Any decent Mechanical SW will work because all you doing is triggering the point Servo searches for the Index pulse.

[A_Camera]

Would you consider using Hall Effect sensors? No moving parts extremely accurate and will outlast mechanical switches. Take a look at these, they run on 5 Volts but I can modify to use higher voltage if needed. They operate in the same manner as a NO switch. However a NC can also be created and will not be expensive.

https://www.tindie.com/products/Kard...ll_prod_search

NO switches are not recommended as limit switch. I would never use them in a mill, maybe a 3D printer, but otherwise your switches look nice.