907 y axis travel exceeded

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Bearfood wrote: Perhaps I figured it out. If I hit touch off and enter 1" z height then the machine drops to 1 inch and starts running through the cuts. This is great! Then if I reset home to be 0,0,0 restart and touch off to 1" I again get the same error that my z exceeds the negative limit. How is the z typically set up and what is the typical home position?

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out of soft limit error

Post by ltasset » Tue Dec 17, 2019 5:39 pm

Re: out of soft limit error

Post by gkas » Tue Dec 17, 2019 6:24 pm

Return to “Control Software related questions”

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Maximum Y-axis travel is 775mm and I need at least 787mm-(RESOLVED)

I can’t get Easel to allow Y-axis travel beyond about 775mm. I need at least 787mm for the musical instruments I make. I have soft limits set, but they are beyond the 787mm I need (793mm). Does Easel (or the firmware) have limits built in? If so, can they be altered?

Check the below GRBL settings.

$130, $131, $132 – [X,Y,Z] Max travel, mm This sets the maximum travel from end to end for each axis in mm. This is only useful if you have soft limits (and homing) enabled, as this is only used by Grbl’s soft limit feature to check if you have exceeded your machine limits with a motion command.

Also, check your machine footprint in Easel.

My $131=793, so that shouldn’t be the issue. Not exactly sure what the “machine footprint” is, so maybe that’s my problem. I did select the 1000 x 1000 machine size.

Can you set your project on an angle, this may give you the distance needed.

I do multiples at one time, so putting them on an angle doesn’t really work. The machine travel is advertised as 800mm, so I am hoping there is a way to get at least 787mm.

What do you mean by Easel won’t “allow” travel beyond 775mm. Are you jogging and it throws an alarm state?

Mine is carving Y800 - X795 mm. Play with your XY homing switch location. You have too much space between bump stop and Switch stop.Easy to align.

Thanks Alan, I should have seen that when I mounted my Suckit, I had to move the stop so it didn’t hit the end plate. I guess I will have to carve a pretty big notch out of the end plate to allow the Suckit to pass by. It does look like I will be able to get what I need and perhaps the full 800mm.

It would throw an alarm and stop in mid carve.

Do you need the full X as well? If not, you could move your X homing switch in to allow for the dust boot. Better yet, set up to home in the back right, grbl’s default.

Good suggestion Neil, but I do need all the real estate I can get in the X-axis as well. I am going to try removing the Suckit and see if I actually get more Y travel. The more I think about it, I don’t see how I will since the machine doesn’t know where my homing position is relative to the rail. I will do some tests and report back.

If you can relocate your Y-homing to the back of the machine, I think you’ll gain all of that space back. You’ll just have to carefully set your Work Zero.

I spent the morning trying a variety of things and it turned out that the max. travel was independent of the homing location. So there was no benefit to relocating the homing switch stop. In the end, I got the travel I needed by turning off the soft limits. I clearly don’t fully understand how the soft limits work. I had adequate travel on paper, but the way they interacted with Easel limited travel more than they should have. It was almost as if they take into account the bit diameter and reduce the travel by that amount. In my case, I was surfacing a vacuum table with a 1.0" diameter cutter so the resultant loss of travel was significant.

Thanks for all the suggestions that helped me work through this. Definitely a learning experience.

You can adjust you soft limits. Set your home, jog till it just about hits and change you setting to that number.

Thanks David, I will give that a try.

Centroid Alarm 907 _ axis travel exceeded on line NNNNN

Cause & Effect Software travel limit would be exceeded by the requested move. Job cancelled.

Action Check program, part zero or tool offset.

Live Tool CNC Lathe: Y-Axis Overtravel Explained

While the concept of having a Y-axis on a multi-axis live tool CNC lathe is simple, the non-orthogonal way the axis moves, and the ins and outs of those movements, can be a little more complicated than expected. So, in this blog I explain the Y-axis movement and how overtravel can occur.

When we jog the X-axis or Z-axis on a lathe, it is simple to understand how the machine will behave to accommodate those movements. Both axes ride along precision linear rails that stretch the full distance of travel for each axis. The travel for each of these axes will add to the determination of the overall size of the machine itself. The longer the Z-axis travels, the longer the bed of the machine will be, for example. But when jogging the Y-axis, it’s not quite as straightforward (figures 1b & 1c).

On most multi-axis lathes with a Y-axis, the movement is non-orthogonal, which simply put means that the movement is not a linear or perpendicular 90-degree movement. Jogging of the Y-axis is made possible using a wedge design in the machine where the perpendicular travel is actually achieved by moving two separate parts of the machine (figure 1a).

When the control receives a Y-axis movement command, it’s the combined movements of these two pieces that form the wedge that will affect the movement of the tool tip as desired (figure 2a, 2b, and 2c). Again, we ultimately get what appears to be a perpendicular orthogonal movement of the axis, which is made possible by the non-orthogonal movement of the machine components.

This Y-axis motion also allows us to utilize multiple tools in each tool station by providing the ability to shift the axis and teach multiple tool offsets for the same turret station (figure 4a). This capability is not only limited to live tools, but also static stick tooling of both double and quad holders. The quad holders can also expand this multi-tool capability for use on sub-spindle machines as well for secondary operations (Figure 4b).

(Figure 4a by EXSYS Automation ; figure 4b by Modern Machine Shop )

Now that we understand what is entailed in moving the Y-axis, let’s discuss one of the issues that can be created by this movement when the turret moves to a designated location for a tool change. Since the commanded position of the X-axis for tool change positions references the tool tip, let’s assume that the Y-axis is NOT at the zero or home position (center of the Y-axis stroke), and the X-axis commanded position is well within the travel limits of the machine. We still get an “out of travel” alarm, causing the machine to stop. Why did we get this error?

The images below should help clarify the reason for the out of travel error. In figure 3a, we see the X-axis at its full travel position, and the Y-axis is at its zero or home position. In figure 3b, we see the tool tip travel to a positive commanded position of Y 50. The turret can easily move to that location by simply sliding along the wedge without the need to move the X-axis cross slide at all.

However, in figure 3d, we see that the commanded position would require both the wedge and the X-axis cross slide to move in order to reach the commanded tool tip position – the wedge would need to move negative, and the X-axis would need to move positive - but the X-axis is at a point of full travel and cannot move any further in the positive direction, so the control will produce the error and stop the machine.

If the condition mentioned above was during a machining operation, and the commanded position was out of the travel capabilities of the machine, then a programming correction would need to be made. Or, possibly changing the length of the tool being used or the holder type might both be ways of handling this issue. Either way, it would be up to the program and operator to solve the problem.

On the other hand, if the issue was created while the machine was moving to a designated tool change position, then we do have the possibility of addressing the issue inside of the control software , which is how Hurco has decided to correct the issue. Whenever the control sees that the turret is being commanded to the tool change position, the Y-axis will automatically return to the home or zero location to eliminate the possibility of the out of travel limit error.

You'll find more helpful resources, such as training videos and webinars, at Hurco Connect .

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Set Maximum X and Y Travel

Is it possible to set a maximum X and Y travel distance so that the router will not go past the maximum X and Y setpoints ? I would like to do this so it would not go past the maximum boundary of my work space. I have tried to search this out but I am not sure what to search for.

I did install the dual endstops and got them working correctly.

I’m assuming you are running Marlin. I cannot think of a way to do this using g-code, and I doubt there is any simple/standard way to make this happen. Marlin, derived more from 3-D printing rather than CNC work, has no concept of a work piece. I don’t thing GRBL g-code has this concept either, but I’m not 100% sure. In addition in the way most MPCNC owners use Marlin, it has no absolute concept of the work piece origin. Coordinates are relative to the work piece.

But CAM software does have a coordinate system relative to the work piece and can know the size of the stock. I’m not sure what specific problem you are trying to solve, but in Fusion 360 I can confine a particular toolpath to a specified area. So you might take a look at the setting you have for your CAD/CAM software.

Gcode in general, and grbl and Marlin both, support both machine and workpiece coordinate systems. Grbl supports multiple coordinate systems in its default configuration. If you want multiple coordinate systems in Marlin that’s a choice in the config-adv.h file.

You can set the machine travel limits in Marlin but I believe you have to recompile the firmware once you’ve made the edits in the config.h file in order for them to take effect.

For example, on my 3D printer the Xmin is -5 mm, Xmax is 219mm and X axis length is 200mm. This is driven by where the end stop and physical edge of the axis is relative to the 200mm width of my build platform. This allows full use of the build platform but allows for travel moves outside to set up a purge zone. On my MPCNC I only have about .5 mm of travel space reserved so I’ve maximized flexibility of workpiece placement within the machine movement envelope without risking hitting the end stop by mistake.

I was just trying to set a maximum boundary that would/could not be exceeded incase I messed up in telling it to router a job beyond the boundaries (so the router would not crash past the maximum working area), not sure how to explain it.

Before I respond, I want you to know that I misread your original question. I thought you were trying to confine the router to the area of the work piece, not confine router to the work area of your machine.

I was just trying to set a maximum boundary that would/could not be exceeded incase I messed up in telling it to router a job beyond the boundaries

When you crash against your machine limits (and I’m saying “when” not “if”), your machine will make this awful, ugly, nasty sounds that you will swear is the pully grinding up the belt or some gears in the motor grinding against each other. I remember the first time I had this happen with my Burly, and I carefully inspected the belt for damage and just prayed I had not destroyed the steppers. According to folks in this forum that have far more engineering knowledge I do, that sound is totally non-destructive. It is the stepper failing to take a step, and on a further step, the stepper whipping around the opposite direction…essentially oscillating. Given how steppers work, nothing is being damaged inside the stepper and there is not enough force applied by the stepper to hurt things like the trucks or the belts.

The one exception concerning damage is the limit switches. It is possible to smash the limit switches and potentially damage them. You can mitigate this problem by making your home/origin as close to the end of the tube as possible. Your limits switches should click just before the truck hits the end of its travel. That way if/when you reach the end of the travel, the truck will bottom out before the limit switches are smashed.

Now that I understand a bit more of what you are trying to do, there is a way to make it happen. Note this is only theory on my part since I’ve not done these steps on my machine:

• Enable max software endstops. You need to uncomment this line in Configuration.h:

// #define MAX_SOFTWARE_ENDSTOPS

You need to set X_BED_SIZE and Y_BED_SIZE in Configuration.h to the size of your work area.

Re-flash the firmware after making these two changes.

You will need to add some command(s) to your g-code file that changes to a different work space before you start cutting. See the reference for G54-G59.3.

That is you cannot execute a G92 while in the machine workspace. You need to switch to another workspace before resetting the origin relative to the stock. By switching to a different workspace, your machine workspace remains intact and the soft limits can work. Depending on your software pipeline, you may just be able to add a G55 to your start g-code and optionally a G53 to your end g-code.