Centroid Community CNC Support Forum

Nice list, actually I think I would benefit from some of those on the list. I'll ask one more time, after this I'll shut up. I can help code the individual screw comp on paired axis. I have industry experience on many programing languages, including C, C++, and C#. It's free for you, what have you ...

I'm sorry, I think i've hit on a sacred cow. I'm just making a feature request and explaining why it would be needed for my particular situation.

To cover the entire x-y area of a large format gantry CNC router, it would take days even if you have a laser or CMM. This makes VC impractical and unsuitable.

Individual screw comp is a simple and elegant solution using just scales.

Yes, but you need scales to tell the machine where the spindle is at vs. what the controller thinks it's at. The problem is on a gantry machine, the X scale is mounted on the gantry itself, so it is moving with the gantry. As I travel down the Y, X scale will absolutely not move. And vice versa, as ...

CNCKeith, I'm using a rotating nut, there is no double nut for that. The methods describe above doesn't actually work for gantry machines. As I explained, volumetric compensation does not work because it needs a perpendicular reference. But for the case of a traveling gantry with paired screws, the ...

I'm buying directly from HiWin, so there's good chance the two Y screws are from the same lot. Which means they should be close (fingers crossed). I'm using the R1 rotating nut in 20/20 2650 mm length. Buying ground screws and scales will blow my budget.

Ideally, there should be individual screw ...

Uwe, I watched your youtube video on Volumetric Compensation. It will not work for a gantry machines because the Y scale isn't directly coupled to the spindle. And since Y1 and Y2 screws have different pitch errors, this means the perpendicularity to the X axis varies as it travels down the Y axis ...

I'll try. But I don't have the luxury of picking which screws I like. I get what they send me, that's it. Any pitch error mismatch out-of-sync will be magnified on the side that's not running the scale. But will be somewhat okay on the side with the scale. Large parts will have trouble. Doesn't ...

No specific application, I'm just trying to build the most accurate DIY gantry machine possible under $30,000. I'm using rolled C7 ball screws but with linear encoders to compensate. Ground C5 screws cost 4 times as much in the lengths I need.

What would you suggest I do?

What I could do is this ...

Hi, I plan to use AcornSix with gantry style Y axis with software defined master/slave. Is there separate screw comp for Y1 and Y2. And let's say that Y1 is master and I run linear encoders, do I need an encoder on BOTH the master and slave? Or can I calibrate the slave Y2 screw comp using an ...