[FpvCnc]

im really having a hard time with the stepper mill config

has anyone setup one of these machines ??
can you point me in the right direction
as far as the axis config, steps per... microsteping...lead screw pitch ... ect i just cant get it to
cut accurately can some one post there numbers,

the one i have is the yoocnc T-DJ 3 axis black control box here is a link to what it looks like

Latest Mini CNC 3040t DJ Desktop CNC Router for Drilling & Milling Updated from CNC 3040 [CNC 3040t DJ] - $712.90 :

the only thing i got with it was mach 3 settings but i am unable to figure out how to apply them to the Linuxcnc
any help would be greatly appreciated

[neusse]

hmm a little quite here. B-)

Did you do a test cut of a known size square? what was the resulting size compared to the gcode? larger or smaller on each axis? Both the same offset or different?


Here is some stuff I have dug up so far. But you are correct, we need to measure the lead screw pitch.
the steps look to be a choice of 200 400 or 320 per revolution.

1.8 deg. per step = 200 steps/rev this seems to be most common.
.9 deg per step = 400 steps/rev
1.125 deg per step = 320 steps per/rev

once we know the lead screw pitch and we know the steps per rotation then we can calculate travel and calibrate your setup. Some testing will get us to the correct values.




Here are the settings one guy used. I would not worry about the micro step yet. You need to measure your lead screw pitch. As you can see it is not the same value on all axis of this guys machine, maybe the same as yours. And if you are who I think you are then they are all currently set the same on your machine.

Using the stepconf
Units: Millimeter
Driver type: other
Step time: 5000
Step space : 5000
Direction hold :2000
Direction setup : 2000

First parport Base Add: 0x378
Base period Maximum Jitter: 35000

Parallel port setup
Pin1 - Spindle PWM, Pin2 - Not used, Pin3 - Not used, Pin4 - Ystep (inverted), pin5 - Ydirection, Pin6 - Zstep (inverted), Pin7 - Zdirection (inverted), Pin8 - Not used, Pin9 - Not used, Pin10 - Estop in, Pin11 - Not used, Pin12 - Not used, Pin13 - Not used, Pin 14 - Spindle CW, Pin15 - Not used, Pin16 - Xstep (inverted), Pin17 - xdirection.

X-AXIS CONFIG:
Motor steps per revolution: 200
Driver microstepping: 8
Pulley teeth ratio: 1:1
Leadscrew pitch : 4.0
Maximum velocity 25 mm/s
Maximum acceleration: 30 mm/s/s
Table travel : -3.0 to 290.0

Y-Axis config:
Motor steps per revolution: 200
Driver microstepping: 8
Pulley teeth ratio: 1:1
Leadscrew pitch : 5.0
Maximum velocity 25 mm/s
Maximum acceleration: 30 mm/s/s
Table travel: -3.0 to 390.0

Z-Axis config:
Motor steps per revolution: 200
Driver microstepping: 8
Pulley teeth ratio: 1:1
Leadscrew pitch : 2.5
Maximum velocity: 15 mm/s
Maximum acceleration: 30 mm/s/s
Table travel : -10.0 to 35.0

[neusse]

OK found this spec on this page.

CNC 3040T-DJ mini cnc Router Engraver Milling/Drilling Machine, Ship from EU/USA warehouse, no extra custom duty and VAT, View cnc 3040T-DJ, CNC Product Details from Shenzhen Liyang Welding Equipment Co., Ltd. on Alibaba.com

It says the following and I assume it is talking about the lead screw

Drive unit: 1204 Double thread Trapezoidal Screw


So the lead screw on your cnc is supposed to have a 12mm diam with a 4mm lead per revolution.


More pieces to the puzzle. Do we have to many pieces now?

[FpvCnc]

yea the china supplyer said they don't know any details of the cnc ... go figure

I saw the 1204 but I didn't know what it meant ... im still learning about all the parameters that go into setting up a cnc . but im eager to learn all the in's and outs ., thanks G for all the help

[FpvCnc]

looks like I got it setup !! , I will share my config soon , Thanks Neusse

[Davidcbittner]

Can you share your config please. I believe I have the same machine and am having some accuracy issues too.
Thanks
David