Guru
Joined: 05/03/2018
Location: NetherlandsPosts: 4809
| Posted: 03:13pm 04 Mar 2025 |
That what it said. 200 watt motor, 24V equals 8A or so.
You need a beafy power supply.
-or- You can buy the Proxxon that was advised.
Volhout
Guru
Joined: 05/10/2019
Location: United KingdomPosts: 7440
| Posted: 03:25pm 04 Mar 2025 |
The PSU for my saw is 200W but the output is switch-adjustable. I've never needed to go past the second step for sawing PCB though. Milling a PCB might need a bit more but the depth is shallow and the cut narrow so I doubt if the power drawn by the motor will be all that big. Stepper motors may well need a decent supply though.
It all depends on the job.
Senior Member
Joined: 20/09/2024
Location: GermanyPosts: 212
| Posted: 04:03pm 04 Mar 2025 |
My conclusion and suggestion for everybody who is seriously interested in a CNC mill below 1000€:
Use this spindle ..a beauty
And for the linear guidance:
Use 40x40 aluminum profiles for the frame or if you have the opportunity weld it.
This can deliver precision which equals 500K mills.
The spindle rotation speed is really important the smaller the diameter of the tool is. 30.000rpm is good to have a possible milling speed of 300mm/min which is a significant factor as you wait 4 hours for a side to be finished or 1...
Edited 2025-03-05 02:14 by dddns
Guru
Joined: 25/06/2022
Location: United KingdomPosts: 2384
| Posted: 04:43pm 04 Mar 2025 |
me neither. it seems a lot of bother for a pcb but a cheap router and other uses is interesting. as long as not cost arm and leg. what's it for I ask myself and it's just a hobby.
Senior Member
Joined: 20/09/2024
Location: GermanyPosts: 212
| Posted: 05:16pm 04 Mar 2025 |
That's why I posted this all. So I suggest:
Tear apart one of your A8. Use all mechanical stuff and build a wooden frame.
Fasten The Dremel directly. And buy a cheap "cnc/arduino nano" board and burn GRBL.
There is a nice GUI to control the machine.
Guru
Joined: 25/06/2022
Location: United KingdomPosts: 2384
| Posted: 06:27pm 10 Mar 2025 |
The milling motor arrived. I got the big bit by mistake. waiting for usbasp icsp for the arduino controller board and 12V 5A pwm controller for the spindle and got 4A 12V supply.
not a 3d printer so downloaded youtube video links to learn. like one layer but make z a minus value but not straight forward looking and haven't tried any of the options yet.
this is just for etching pcbs, the results I've seen look promising.
Senior Member
Joined: 20/09/2024
Location: GermanyPosts: 212
| Posted: 05:46pm 11 Mar 2025 |
This looks promising! Just as a hint, the motor gets hot! Do not fasten it directly to plastic parts but isolate it at least with some rubber or wood in between.
Here two shots of my A8 and what happened to it 5 years ago :))
A thick robust bed is good for miling but bad for 3d printing as it is way heavier. I tried to find a compromise, and that works since the beginning. The spindle is mounted behind the extruder and sits a bit higher than the nozzle so I can mill and print without changing the setup. Good luck for you further!
Senior Member
Joined: 20/09/2024
Location: GermanyPosts: 212
| Posted: 06:38pm 11 Mar 2025 |
My Proxxon and me have something in common, we both are broke..
I took a Chinese 2700 Kv outrunner used for drones and a BDLC controller I bought a year ago. I always wanted to check out these kind of motors, now it is time to ;)
I took a piece of aluminum and an old heat sink.
And I designed roughly a lid.
Here is the story how to pimp a Proxxon to 32.000RpM :))
I will test it..might get to hot but the original 20.000RpM it will surely do:
Edited 2025-03-12 04:41 by dddns
Guru
Joined: 25/06/2022
Location: United KingdomPosts: 2384
| Posted: 08:19pm 11 Mar 2025 |
Thanks for the info @dddns sir. the anet a8 is not going to take much resistance, it's poor design. I may try it for pcb and use existing 3d print software with 1 layer.
my other 3d a8 is acrylic and much better like the x axis is 2 bars horizontal not on top of the other and the extruder mount is metal not plastic and cable wraps but that's why I want to keep it.
I stepped back and thought what do I need it for if only pcb whereas 3d printer lot of fun.. stuff off thingiverse.
this would be better for a router but good as is as printer, cheap..
Edited 2025-03-12 06:44 by stanleyella
Guru
Joined: 25/06/2022
Location: United KingdomPosts: 2384
| Posted: 09:32pm 11 Mar 2025 |
The motor is the one recommended by Mick earlier, £12 but can get for £10 free postage. the mounting bracket is steel. it would be more solid on the other printer without any bracket as it's metal but holes need drilling to mount motor.
lots of people done this but some say the motors don't last, bearings as not meant for lateral stress. others say dremel best others say no.
Senior Member
Joined: 20/09/2024
Location: GermanyPosts: 212
| Posted: 09:45pm 11 Mar 2025 |
I am honest and my opinion is, that this motor is not suited for milling and neither the clutch. The motor can't stand axial forces because of the brass barring and the clutch no radial forces because its made for drilling.
But some million turns the motor will do and maybe the clutch is just fine and runs concentric..
Look at the last picture of the proxxon above: the tiny (high speed/high precision/industrial-grade) ball barring at the tip holds both forces. the motor mounted above just needs to be 100% in line and concentric with the spindle axis. In this type of construction your motor would work as well.
But the Chinese took the shortcut and directly welded a clutch to the motor itself..
Edited 2025-03-12 08:11 by dddns
Senior Member
Joined: 20/09/2024
Location: GermanyPosts: 212
| Posted: 12:33pm 12 Mar 2025 |
It does better than I dared to hope. The test environment was a light barrier for measuring RpM and a 18b20 temperature sensor and of cause PicoMite.
After a runtime of around 18min at 31.000 RpM the temperature rise stopped and kept being further on at 55,5°C. That is more than satisfying as it can run permanently at 32.000!
Guru
Joined: 25/06/2022
Location: United KingdomPosts: 2384
| Posted: 02:06pm 12 Mar 2025 |
@dddns. I agree about the £10 motor/chuck- "a drill" not a "dremel" which is meant for hand use and grinding and using lateral force.
The 3d printer with the spindle motor has too much "play" if the bit met resistance, imho.
I have rationalised this cnc idea and it was only for pcb making and how many pcbs do I make.
It's an interesting post showing your results. There's rectangular tracks and bearings on aliexpress to build something robust like you did.
I watch too many youtube videos which make stuff look easy :)
Mounting a laser on a 3d printer looked interesting.. no resistance when cutting. accidental diy laser eye surgery ?