Axis per steps OK, I changed the 2 A4988 stepper drivers, redo the VRef for all the steppers drivers, plus removed the Y2 invert Y option, and it seems to run good now.
TODO :
First test with the router on Polystyrene :
Result : Perfect .
Super happy with the result.
I will also do my Christmas Present with it 
Need to upgrade the cable management (I will use regular Drag Chains), find a better 52mm Spindle Tool Mount and tidy up a bit the power supply.
Also I can probably go higher than 50, 50, 30 mm / min on Polystyrene like this. Also I will upgrade the router bit for a longer one.
Thank you again to all the community and special thanks to @vicious1 !
NICE!!
For the 52mm spindle tool mount, I haven’t noticed but my spindle is 55m and not 52mm… All good now with the right tool mount. I sanded a bit the back of the Core Z Clamps because some screw were blocking the Z Axis.
I made some cable management, and redo the table (for bigger on X).
I still have a question / problem though :
The Core is not going all the way on the Y axis, because it’s blocking on the screw of the trucks.
I should probably gain ~2cm on the Y axis. Do you know what’s wrong on my setup ?
Some new happy results :
Thank you, I gained probably ~2cm on the Y axis.
I measured the total X - Y axis available from the MPCNC ~39cm on X and ~93cm on Y axis. It seems to be a bit off compared to the calculator. I wanted more or less 50 x 110. I will probably extend it later.
I tried to mill a big piece, and the 400W spindle stopped after a certain amount of time, with the RUN ALM LED red turned on. It did it twice. Don’t know yet the problem right now. Investigating 
Does your spindle have thermal shutdown? Is the motor covered by the clamp that holds the spindle? It may be overheating…
The WS55-180 from the user specification states the RED LED means the motors is “suspended”, but I don’t know the reason.
I tried again, and the motor stops after ~20 minutes. The motor is not hot, so I’m a bit confused.
If I turned the potentiometer to 0 then back to a value the motor restarts normally.
Ref : http://myosuploads3.banggood.com/products/20190508/20190508220426SKU600181WS55-1801.pdf
I should probably have bought a water cooled spindle, but they are 65mm dia, and there’s no tool mount for them.
I’m waiting the support to get back to me.
???
The Makita is 65mm diameter, wouldn’t that mount work?
Indeed, I didn’t know.
I’m testing the motor without any machining working to see if it’s the motor or the feedrate.
After ~1 hours : motor is still running. I’m leaving it another hour to be sure.
If it’s about feedrate / my router bit / the cutter engagement… I will change the settings.
After 2 hours… motor is still running. So probably a problem of “power” (cutter engagement / depth of the router bit / feedrate speed).
Right now I have 6mm router bit with 50% cutter engagement (3mm), at 50mm/s for 2 cm of depth. Seems too high.
I will try to reduce the speed first to 30mm/s and maybe second parameter maybe reduce to 33% the cutter engagement.
Also question as of a noobie of the CNC / spindle : should I parameter my gcode for the feed to be the same direction as of the rotation of the cutter ? Or this is not so important ?
Yeah I don’t think those little spindles can handle that. If you are going for that sort of material removal rate, I think a router or the 800W spindle might be a better option.
I changed my gcode for 2mm cutter engagement and 2cm of depth layers. Just for information the .gcode doesn’t have M203 or any Mesh commands, it’s only GXX location code.
I tried to lowered the DEFAULT_MAX_FEEDRATE from { 50, 50, 30 } to { 40, 40, 30 } or { 25, 25 , 30 } and after the M502 + M500 command (then checked with M501) + relaunch the .gcode plan, the carriage move very very very slowly.
I reset to { 50, 50, 30 } MAX_FEEDRATE, and relaunched the .gcode plan and I noticed the carriage move more ~1cm / second than 5cm.
I’m a bit confused right now why the real feedrate doesn’t seem corresponding to the MAX_FEEDRATE setting.
Another possibility for the spindle to be suspended are the vibration. I will make more simple tests.
For the feedrate, I’m really confused.
I set the following one :
opt_set MANUAL_FEEDRATE “{ 50, 50, 30 }”
opt_set DEFAULT_MAX_FEEDRATE “{ 50, 50, 30 }”
Then compile & upload, and if I run M203, I see the right MAX FEEDRATE. And the Feedrate percentage is also set to 100%.
But when I run a gcode file from the SD card (I tried very simple / minimal gcode), it seems to run ~5 or 10 times slower than 50mm/s as you can see on this video :
But the MANUAL_FEEDRATE is OK cause when I run + / - X / Y axis from the menu, it moves around 50mm/s which is the right one.
Am I missing something for the feedrate when running from gcode file ?
An example of gcode from BlenderCAM (which is basically only G commands, I don’t see anything related to the feedrate) :
Boitier Antoine.gcode (615.9 KB)
Also an extra question : what do you think of the sound of my CNC / NEMA 17 ?
Found the issue for the feedrate. In the gcode from BlenderCAM :
G01Y-45F500
or
G00Y-45F500
The F500 set the feedrate to 5mm/sec .
Let’s go back to testing the motor, but now at good speed, let’s say ~25mm / sec.
The feedrate is good now.
I still have some trouble with the motor… Waiting for the support to call me back and give me a solution.
This is probably one of the last post on my HydroP MPCNC Primo build.
I switch to a Makita RT0702C because the original 400W motor get suspended with no valid reason. The Makita make more noise, but seems ok so far.
I run a first test :
I will be more meticulous on the positioning of the MPCNC on the blocks, but otherwise, I’m super happy with the result.
I learned a lot through the journey of building the MPCNC Primo.
Thanks again to all of you for the different help
I won’t forget to post some results of the Boards I will shape with the MPCNC in the other forum section !
See you !
It’s me again… I still have couple of problems things to tweak.
The Z MAX DEFAULT FEEDRATE : If set to 30mm/seconds, the motor is skipping steps / bipping / blocking. I changed it to 5mm/seconds and it seems alright. I changed the X / Y max feedrate to 25 also.
For X / Y axis, the axis doesn’t seem to roll very easily when there’s no power to motor (even though the core moves if I rotate my CNC at ~70 degrees). Also the Core is vibrating a lot when machining (more in the center of the CNC than on the sides with a 15 cm router bit).
So I suspect (1) the table and its rigidity (2) the bearings of the trucks / rails to not be really good ? (3) to not have perfectly squared the table / machine for this size ?
I’m adding 4x feet to the Y (which is my max axis) in order for the rails to not bend. I will try to add also some axis support on X just to be sure it’s not bending also in this axis.
And will do more tests.
Also I have a result of X 38cm and Y : 92cm usable on the machine, and should probably change it to something like X : 70cm and Y : 70cm and place the machine multiple times. Bad design from my side.
It would allow less vibration / bending / smaller table. And also easier to store and place.
I’m thinking of reuse the maximum hardware and doing it again.
I unmount all the MPCNC, and I’m redoing the table and everything clean and meticulously.
First, I noticed checking the trucks that some screws are too tight, so the trucks were not moving at ~45 degress, but more around 75-80 degrees. Also they left some used marks because of too tighten on my rails as you can see on this picture :
I think this is one of my biggest previous problem.
I also noticed checking the screws on the motor coupler, one were very loose.
I’m redoing the “table” CNC with a machining area of ~65x65cm which should be enough for my Polystyrene Block (I will move it twice more, but hope to be more precise). I calculated that the rails + table needs to be 1mx1m.
The table is composed of bracket of wood of 32mmx32mm, I place 2 per side, and I added some fiber glasses + epoxy resin in order to have much less bending possible. I will also add some bracket parts between the 2 in order to solidify even more the structure (no bending possible whatsoever).
I will add 4 supports per axis.
Re-assembled everything with the new frame. New dimension : X 705mm Y 730mm machining area.
First, the trucks glides much better.
For the final Squaring I noticed I have ~1 to 2 mm difference on the Y axis. This is acceptable.
I tried with my previous motor for the reason it can work at 5 to 6k tr/min (which is the recommended tr/min to machine EPS).
But the motor stopped 4 times during a 30 minutes machining… I will change it back to the Makita Router, which is 12k tr/min minimum.
Result :
Me :
Happy
Soon others results.
