Mars Pro "Set Z Home" seemingly not working - Printable Version +- Elegoo 3D Printers Forum (https://www.elegoomars.com/forum) +-- Forum: Troubleshooting (https://www.elegoomars.com/forum/forumdisplay.php?fid=8) +--- Forum: General Troubleshooting (https://www.elegoomars.com/forum/forumdisplay.php?fid=11) +--- Thread: Mars Pro "Set Z Home" seemingly not working (/showthread.php?tid=490) Pages:
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RE: Mars Pro "Set Z Home" seemingly not working - cliffyk - 07-11-2020 I believe the "home" position is determined by monitoring the photo-sensor at the trolley's physical downward travel limit--NOT in firmware by tracking lead screw rotations against any parameter saved by the Z=0 function (even if it does do anything). One would have to disassemble the firmware to verify this (may do that yet, I have an old copy of IDA Pro kicking around somewhere). The configuration G-Code file (see below) has a number of references to a Z-axis limit switch (unfortunately the comments for same are not in any form of conventional English making it difficult to determine just what is going on). In any event the utilisation of both the firmware configuration setting and a physical "switch" (be it mechanical or a photo-sensor) would be redundant--and since the latter (a physical switch) exists, and has a real "per unit cost" associated with it, I believe it to be the active element, with the (perhaps) abandoned "Z=0" function only serving to complicate things. I will have to see if my old version of IDA supports whatever micro-controller this thing uses. Configuration G-Code, Z-axis limit switch settings: Code: ;Z-axis limit switch position type RE: Mars Pro "Set Z Home" seemingly not working - cliffyk - 07-16-2020 I have had a round of email exchanges with "Leon" at Elegoo, a very helpful gentleman. Here is what I found about the z=0 function. He graciously responded to my initial "What the heck does 'Z=0' do?" query: Elegoo support Wrote:The Mars zero reset function is mainly to compensate for the large Z-axis error of the machine during long-term use of the machine, and the size of the Z-axis method of the model is not accurate. Does not have a physical impact on the LCD To which I responded: cliffyk Wrote:Thank you for you swift and informative reply Leon replied: Elegoo support Wrote: So, there it is--the "Z=0" function is an on-the-fly procedure to validate and if necessary tweak the logical "0" position of he platen in-between performing the complete mechanical alignment--I.e. it sets the "0" position to be achieved by issuing the "G0 Z0" or "G1 Z0" or "G28 Z0" G-Code commands. The "Home" button will continue to position the platen to the hardware limit switch "0" position. RE: Mars Pro "Set Z Home" seemingly not working - maximumbeef - 07-19-2020 I am not understanding something here. Sorry for my failure in that. If the set z=0 function is only to put it back into spec after long term printing, then it is correct NOT to do that unless all leveling practices fail to print. Correct? If that is true, then what does change the '0' position during the leveling? If you go into the manual movement, perform the process (and in my non-surveyor definition of 'leveling' to make (a surface) level, even, or flat:, not the plane of the earth Surveying. to find the relative elevation of different points in (land), as with a level. for my definition please see 19, 20 and 27 here) then is it the most important part to go up 10mm 10 times? Is that what the software/firmware calculates as the home position or z=0? Where you stop then -100mm??? Thank you for helping me out here. PS. My first print failed miserably. I saw metal shavings on the top of the build plate after tightening the screws. Cleaned it off and didn't think much of it. Machining aluminum isn't always perfect. Well, when I went to unscrew the entire bolt it was cross threaded from the factory. I have contacted Elegoo about this as they really should send me a new plate and screw, but if they don't then I just may return it to Amazon and go with a different brand. I was able to get one of the spare screws (I see why they include them now ) and it tightened down just fine. I will need a new one if I start getting some prints. As long as it works, I am fine with buying new parts for it as this was partially my fault for following the directions... RE: Mars Pro "Set Z Home" seemingly not working - cliffyk - 07-19-2020 (07-19-2020, 09:11 AM)maximumbeef Wrote: I am not understanding something here. Sorry for my failure in that. In the mechanical alignment process, initiated by loosening the lock screws and pressing the "home" button, the machine's "0" (furthest downward travel) position as determined by the limit switch does not change. What does change is that the physical position of the platen is changed to coincide with the limit switch "0" position. Using the "Z=0" function establishes a logical "0" position , independent of the limit switch controlled "0" position. That logical "0" position is then used when G-Code Z-axis positioning commands are executed. The go to "Home" positioning command will still send the Z-axis trolley to the limit switch controlled downward position. (07-19-2020, 09:11 AM)maximumbeef Wrote: Thank you for helping me out here. RE: Mars Pro "Set Z Home" seemingly not working - maximumbeef - 07-24-2020 I think that is what they intended it to do, but if I hit that button it buzzes like mad and is so tight I couldn't fit an atom in there. If I skip that step, it works pretty good. I don't think it is setting the position properly. I was able to get the test print to work, but it was supposed to print 2 rooks and I only got one. The second one got about 5mm and stopped sticking to the build plate. Still, the finished one came out almost perfect, so I am pretty impressed at the resolution of this thing. At any rate I am printing a One Piece Zoro for my son and a dragon for my daughter right now. I leveled it again, this time pressing down very hard and flat. I am hearing quite the suction sound all the way to 300+ at this time. I hope they both print well. I did contact Elegoo and told them that I had a screw that was stripped and they are going to send me something. I was able to loosen the front screw and tighten it down again, so maybe it will be ok. No shavings on the top of the plate this time. At any rate I recommend not hitting that set z=0 button. RE: Mars Pro "Set Z Home" seemingly not working - cliffyk - 07-24-2020 Did you see my thread here about "What the 'Z=0' function really does..."... |