Hey guys,
Its been about a year since I worked on my Bridgeport boss 6 retrofit.
My problem is when I start the spindle using MDI, my z++ limit trips .
-My z++ limit and z home is shared by a optical sensor via pin 12 and normally closed.
-My z--, x++,x--,y++, and y-- is in series via pin 11 and is normally closed using mechanical switches.
- I do not have and x or y home switch yet.
When I home the z it homes correctly.
When I exceed the z++ limit it trips correctly

however, like I said when I start the spinlde via mdi through mach3 (T1S1000m3;) the z++ limit trips
I know its the z++ limit because when I deactivate the z++ in the inputs page, the spindle runs and does not trip a limit.

I do use a vfd in my machine.

Has anybody have had this issue, thanks Joe

I plan to finally post pictures of my design shortley thanks to all those who have helped me (hood).

Do you use shielded cable for your limit switches.

If not, this could be the problem.

VFD generate a lot of electrical noise.


Jeff

You could also try a value of 2000 in the debounce setting in general config, on the top right of the page.


Jeff

Thanks Jeff,
Yes I use shielded cable.
I have tried the debounce also.
If i eliminate the z++ as a limit in the inputs page I do not have a problem, wondering if it is a software problem in my control.

Do you see the led in the diagnostic page.


How close are the Z home switch and the Z++ switch from each other.

Does it trigger at the moment you start the spindle.

I've seen it when the spindle start, there was a very very little movement of the head, enough to trigger the limit switch.

The point where the switch is open or close when homing is maybe 1/1000 of an inch so already had this problem before.

Jeff

Could you have duplicate pins set, ie you have the same pin configured for your spindle as you have for the limit
Hood

Hood I will check to rule that out !

Jeff I have tried to activate the spindle away from the home switch and limit, the quill is halfway down
Let me rephrase that, my z++ limit and z home is a optical sensor ( they are the same switch) on pin 12.
So I have only a mechanical limit for z--  at bottom and a optical sensor at top for both limit and home.

Joe

Hood I have checked my pins in mach 3 under motor settings. the spindle outputs are 16 and 14 for step and direction.

I am also using the usb from the computer to power the bob and spindle board.
I have also used straight connections from the power supply by cutting a molex connection.

I went to usb from the molex to see if that would make a difference, it didn't.

Should I have a dedicated power supply for 5 volts, could this be causing a problem?

Dont think power should be the issue.
What kind of switch is it? If a mechanical switch is there a chance that vinration is the issue?

Hood

It is a optical switch, I am using it to control the Z++ limit and z home via pin 12
I have a mechanical switch on z-- limit, and vibration does get into the switch at times, which i will have to investigate a little further after I am past this task.

Hood I have noticed in other threads you have built a beautiful bridgeport retrofit. May I ask, did you just use the mechanical switches as both homes and limits.
Or did you use the mechanical switch as a limit and put a more accurate homing sensor such as a slotted optical sensor. If so how did you mount the optical switches under the machine for the x and y axis. I bought and use pmdx slotted switches for my machine.

Thanks