I’m having a recurring issue with CNC jobs on the A350 where at some point it loses it’s position and then continues along with the program with some random offset. Generally speaking, I see this the most when trying to do profile cuts - this is the first time it’s happened on a finishing path. [I…

Do you observe the machine while this is happening? Potentially the load on the machine at some point is too high and the steppers skip steps. This would lead to a loss of correct position. Same might happen if your feedrate is too high, although SM2 firmware limits should prevent this.

As you can see from the example image, there was no particular load (no more than the previous 90% of the job) especially noting that I’m running the 200W toolhead. Also, I’m really conservative about the feed rate on the Snapmaker so I’m not pushing it hard at all. I have seen this in person where…

Feeding your GCode into this GCode-Viewer it looks completely sane and I cannot see anything that would explain the behaviour. There are no coordinate system changes, which sometimes confuse the Snapmaker etc… I have seen the SM2 loosing its coordinates after you pause and resume a job, but it does …

I hadn’t thought to check the linear module temperatures, but I see this happen with smaller jobs as well (profile cuts of 12 passes of a ~180cm circuit), but even this one had managed two previous passes and 95% of the current pass without issue, plus the A350 is in a fairly cool basement so overhe…

OK, does not sound like overheating is the likely cause… Just to give more details on that anyhow, see here: Linear Module defective and FW 1.8.0.0 Feedback - #6 by Edwin The silicon pad mentioned there was found missing by some SM2 owners, which caused overheating of the stepper drivers. For me i…

Used my moderator powers to move the Stop-Button-Topic into a separate thread: [image] Behaviour of Snapmaker 2.0 on Stop methods Snapmaker 2.0 I have a similar problem OK, I am Using Debian Linux and USB connection to SM A350T - so not a common setup. If I …

Hmmm - not knowing exactly how the internal communications works between the components, I’m not sure about this, but I think that I may have a working hypothesis. Somewhat related to the stop button thread that got worked in here, I’m thinking that individual controllers (X-Y-Z) have some small buf…

Your guess is as good as mine - I admit that I would think voltage drops of that kind would crash the machine, not disturb it this way, but it’s only a gut feeling. And, if your vac sends out a lot of electric noise, it may indeed cause bit shifts in the communication in theory - again, my gut feeli…

No patterns - this makes sense if it’s a communications issue and dropping stepper motor instructions rather than an innate mechanical issue. I can’t see the system inventing commands to insert which would give a specific pattern either.

A350 CNC Recurring problem

Snapmaker 2.0 (3-in-1)

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A350 CNC Recurring problem

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