2 Nema23 1.26Nm steppermotors for the y-axis,(2Amps at 3.6Volts)
1 Nema23 1.26Nm steppermotor for the z-axis(2Amps at 3.6Volts)
1 Nema23 3Nm(435oz-in) stepper for the x-axis(4.2Amps at 3.78Volts)
Im driving the steppers with 4 TB6600 Stepperdrivers (one for each motor) controlled by an Arduino Uno with Grbl and Universal Gcode sender on my laptop.
There will be 2 SFU1605 ballscrews for the Y-axis, 1 SFU1605 ballscrew for the X-axis and one M16x2 threaded rod for the Z-axis.
(10/13/2018) I just received the first batch of 2.3 cm plywood and started building. I started with the wasteboard and drilled all holes into it. This wastboard will not be "wasted", there will be a 1cm-2cm thick MDF board on top of it.
And this is the real life picture
I have now assembled the linear rails on the Z-axis and they are moving pretty freely and smooth.
(first half 2019)
I have now finished the Z-axis. It weighs about 7.5 Kg (16 Pounds) and a speed around 400mm/min (15.8"/min) without loosing to much torque.
(the backlash is removed by tilting the nuts in different directions)
I have tried the same technique for the Y-axis which didn't worked that well because the resistance and backlash was way to high than what I considered good so I bought some cheap SFU1605 ballscrews from China as listed above.
In the past few days I assembled the first ballscrew on the Y-axis. The alignment was pretty good thus the ballscrew could turn with very low resistance and no backlash(by eye). The only problem is the way i have to mount the stepper to the frame of the CNC because the stepper is so far away from the frame of the CNC and the space is very limited.
Right now I just got one of the supports of the stepper in place but that one alone would be probably enough. With this setup I could achieve a feedrate of 2000mm/min (78.8"/min) with no load (so probably just for rapids) and no obvious signs of the stepper loosing steps.
In the time between the last post and today I have done a lot of testing with the TB6600... I found out that at some feedrates and no load I am loosing steps.(like <300mm/min; >1500mm/min and at some speeds in between). With load (ca. 5-15N) I am sometimes loosing steps worth of up to 0.15mm(0.0059") or even more. I also tried different microstepping settings like 200(no microstepping), 400A(2 times) and 800(4 times) steps/rev and found out that at I am loosing the most steps without microstepping (which could be just random).
There is an unfinished Fusion 360 file below which could be just mirrored to complete (it isn't cantilevered)(also the steppers, leadscrews of the X- and Y-axis and all the screws are missing)
Gantry Style CNC from plywood
I am currently 15 years old, from Germany and trying to build a low budged CNC router. I only designed this CNC based on other CNC routers that I have seen and what I am able of. It consists mostly of 2.3cm plywood to keep costs down. The size of the work area is approx. 40 x 80 cm. I would be really glad if you could give me advice's for improvement on the design and everything else ... ( I could really need your help :) ) enjoy :)
- Build License:
- CC - Attribution NonCommercial - Share Alike - CC BY NC SA
Reason for this BuildI build this to get an insight to the world of machining.