Home proximity switch activating, axis reversing but then moving forwards again?

[chillybo]

Hi there, much more knowledgeable people,
After finally getting some free time I am now at the stage of my build where I can do some wiring to the machine (gantry style router, CS Labs IPM, 3 axis, proximity switches mounted sideways on, Mach 3 etc). So I have just wired my first proximity home switch for the gantry and when I click home, off the gantry goes to the home sensor which is then activated and the gantry backs off. Problem is it then reverses direction and carries on towards a collision. Is this something to do with home and limits settings in mach 3 and the sideways / perpendicular mounted proximity sensor? I've tried experimenting with parameters but I'm not sure what i'm doing. Can anyone please advise why this is happening?
Thanks Chris

[Kitwn]

Not sure about Mach3 but in LinuxCNC the gantry runs to the switch at relatively high speed, backs off a few mm and then runs back to the switch again more slowly to get a more consistent homing reference. It finally backs off again to the set parking position.

One guess would be your final parking position is a negative value on the wrong side of the switch.

[JAZZCNC]

Can you post some pics of your home and limits setup screens. It's 99.999% just a setting but without seeing your settings i'd be guessing. Or better still post your XML file which you will find in the mach3 folder under the same name as the profile you use. You will need to Zip it up so the forum will allow you to upload it.
Then I can see all your settings.

[chillybo]

Thanks Jazz,

Mach3Mill.zip

Hope I've attached the zipped XML file and not something else.
I altered home and limits to the new settings that should be showing on the XML file and it now works. Problem is that if I alter the home speed above 3% the machine makes an awful noise and the gantry doesn't move. The noise is high pitched and changes depending on the home speed. It doesn't sound like when a stepper motor stalls.

Thanks Chris

[JAZZCNC]

Thanks Jazz,

Mach3Mill.zip

Hope I've attached the zipped XML file and not something else.
I altered home and limits to the new settings that should be showing on the XML file and it now works. Problem is that if I alter the home speed above 3% the machine makes an awful noise and the gantry doesn't move. The noise is high pitched and changes depending on the home speed. It doesn't sound like when a stepper motor stalls.

Thanks Chris

Didn't work not seeing any thing in the zip

[chillybo]

Jazz and folks, here's a couple of pictures - home limit screen and motor tuning screen - if that's got anything to do with it.

[JAZZCNC]

What units are you using Metric or imperial.?

[chillybo]

metric

[chillybo]

It also makes that noise when I press shift and jog but not when incremental jogging

[chillybo]

Thanks Jazz, The drivers are set at 1600 and the ballscwews have a 5mm pitch. I have a 26 tooth driver pulley and a 20 tooth driven pulley. So do I divide 26 by 20 which gives 1.3 then add it on to 5 = 6.3 so the calculation is then 1600 divided by 6.3?
Thanks again Chris