Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: cds333 on September 13, 2019, 01:41:41 AM

Title: Limit tripped but nowhere near switch?
Post by: cds333 on September 13, 2019, 01:41:41 AM

I was machining some mild steel yesterday and the limit kept tripping however I was in the center of the table with no switch anywhere close.

Does mach3 or perhaps the control board have a builtin feature where the limit will trip if the tool encounters too much resistance? Maybe as a feature to prevent damage to the machine when you crash the tool into something you cant cut?

I assumed this was the case because the machine works great everywhere else except when I was trying to use the side of the mill to cut with, and there and only there did the limit keep tripping.

fyi I have a C10 breakout board.

If this is a feature what is it called?

THanks!

Title: Re: Limit tripped but nowhere near switch?
Post by: joeaverage on September 13, 2019, 05:08:07 AM

Hi,

Quote

Does mach3 or perhaps the control board have a builtin feature where the limit will trip if the tool encounters too much resistance?

No, Mach3 does not do that.

My guess is that electrical noise is getting into your limit switch wiring.

In the first instance you need to fit line filters and/or line reactors to tame the noise from the spindle.
Thereafter look to shielding your signal wiring, load the signal lines with an impedance chosen to damp noise optimally.

Most beginners spend all sorts of trouble shielding and filtering signal lines without ever considering reducing the noise output
of by far and away the noisiest (electrically) component....the spindle.

Craig