Weird UCCNC Issues

[Colt4587]

Good evening all,

I'll be quick. I've got a DIY CNC machine with a PM-25MV running UCCNC on a ETH300+5LPT and a MX3660.

The "direction positive" check box does nothing to any of my axis, they go the same way regardless of that setting. Also, the toolpath screen, when it has the Z axis supposed to be going up it actually shows it going down. I CAN confirm that Mach 3's reverse direction option WORKS, UCCNC's does NOT.

Also, in both fusion's "simulation" and UCCNC"s toolpath window don't match what the mill is actualy doing. I've been practicing in wood, I will set my Zero point in the lower left hand side of the stock and will hit run. Instead of helixing down slowly into the wood, the machine drives it straight down through the wood, and then helixes around into the wood, where it should still slowly going down. Then, when it should be facing slowly into the wood, it's actualy above it. At my wits end here.

*edit* Forgot to mention, at times when the Z should be raised moving to a new cut, it doesn't actually raise the Z, it just plows through the material.

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[peteeng]

There is a difference between "home" and the "zero" position. Are you correctly zeroing the job before each run? Peter

[Colt4587]

There is a difference between "home" and the "zero" position. Are you correctly zeroing the job before each run? Peter

I apologize, I meant zero, I have updated my post to reflect that. And yes, I am zeroing everytime. I should also mention that the mill goes up really high on the Z axis before it starts and drills down deep into the material. I have the steps per unit set to a MM scale, and I am using MM in fusion.

Also, any thoughts on why "direction positive' has no effect?

[dezsoe]

The direction positive set the homing direction only. That is why it is in that line of settings. E.g. you have an X axis and a home switch on the nagative side. The homing will start to the negative direction to find the switch. You have a Z axis and the home switch is on the top where the Z goes to positive direction. In this case you have to set direction positive to make UCCNC to search for the home switch in the positive direction.

If you have to change an axis direction then you have to change the active low checkbox in the line of the dir pin.

[Colt4587]

The direction positive set the homing direction only. That is why it is in that line of settings. E.g. you have an X axis and a home switch on the nagative side. The homing will start to the negative direction to find the switch. You have a Z axis and the home switch is on the top where the Z goes to positive direction. In this case you have to set direction positive to make UCCNC to search for the home switch in the positive direction.

If you have to change an axis direction then you have to change the active low checkbox in the line of the dir pin.

Perfect, thank you that fixed the z axis reversed issue. Now I am trying to figure out something else. When I tried to run the project the mill had a huge Z axis up move: https://imgur.com/xwMvoL0

But when I load the same project on my test/design computer, it looks like this: https://imgur.com/nL5uaBo

As far as I'm aware, I have everything identically set on the two.

[ger21]

Fusion posts typically send the machine to the Z axis home at the start, and the "Home" position is probably different on the two PC's.

[Colt4587]

Fusion posts typically send the machine to the Z axis home at the start, and the "Home" position is probably different on the two PC's.

You're probably right, is there any way to change the z "home" position within UCCNC? I've gone through the menu's and can't find it, but I may just be blind.

Also, oddly enough, if I uninstall the software and reinstall it doesn't have the huge Z jump. But once I close it and open it again, the tool path view changes again.

[ger21]

Home is where the home switches are, or where the machine is when you push the Home All button.

[peteeng]

Zero all and home all before you start. That will help to understand whats happening. Plus if you open the G code in a txt file reader you can see what the initial Z is and if there is a Z up in the fist few lines. Peter

[Colt4587]

I currently don't have any homing switches on the machine, I am zeroing everything before I run a job. Currently I'm just running very very simple things as I am new.

I just still don't understand why if I uninstall the software and reinstall it, it works fine, but upon next start up, it takes my machine to essentially infinte Z.

[Colt4587]

Home is where the home switches are, or where the machine is when you push the Home All button.

How do I change where it homes without switches?

To illustrate, this is what my tool path screen looks like at first:

https://imgur.com/1AhspqD


This is the code driving it, which I think means you're correct that it's just sending Z to it's zero position:

https://imgur.com/lUBUj5q

And this is the same exact file, 2 minutes later, after an re-install of the software, and it works perfect.

https://imgur.com/RC2aWqH

[Colt4587]

Also, thank you all for your help!

[ger21]

How do I change where it homes without switches?

Wherever the machine is when you click the Home All button is where home is.

You can also specify the home position for each axis in the axis setup pages. But you'll still need to click the Home All Button.

[Colt4587]

Wherever the machine is when you click the Home All button is where home is.

You can also specify the home position for each axis in the axis setup pages. But you'll still need to click the Home All Button.

Makes sense, I guess I'm an idiot because I assumed that actually sent the axis to the home position, not set the home position to that point. Let me give that a try, thanks again!

[ger21]

I assumed that actually sent the axis to the home position

If home switches are configured, then it send the machine towards the switches. If no switches are configured, it homes in place.