I've just built a similar spindle with an ER11 spindle with 8mm shaft. What kind of PSU are you using? I'm having trouble finding anything that's up to the task of me sending this spindle into metal. Only thing I can think of using is an ATX supply.
Really interested to know more about how this is assembled, I seen the link for the speed controller but how is it assembled onto the spindle and how you are controlling the speed? Also will this setup work with any CAM controller software or just yours?
I'm building a tiny CNC machine for milling PCB. Did you like the dremel chuck? I'm planning to buy such a chuck and make a beared spindle attached to a brushed DC-motor which does around 12k rpm at 12v. I read a lot about the chuck not being centered. Did you have this problem?
@knutselman No. The dremel chuck is not precise enough for pcb-milling. It has a lot of runout and in addition the threads on the chuck are not true, making it angle randomly to one side when tightened. The error is small, but noticeable and differs from unit to unit.
Could you please tell me how did you couple the chuck to the motor's shaft? I've been looking for something off the shelf and had no luck. thank you!!
@1kreature Ah, thanks, well, looks like I have to put it on hold for now. I was thinking about something like a "double sided chuck" similar design as an ER style chuck, but with a threaded tubing in the middle and able to tighten up on both side... just an idea.
@soulstudio I would suggest you look at those cheap dremel tools with flex-tube on em. Clamping the flex-end will be much simpler. It also solves the drive-coupling.
Alternatives really require tools to machine parts.
2 more questions... is the pwm input from a servo tester or TX? and what are you using for a power supply to the spindle? I have several large brushless motors similar to yours but they are all too low a kV to make any reasonable rpm. thx
@hho95667 At the moment I run my spindle-system from a 12v supply. This gives me a maximum of 17000 rpm. If I had a higher voltage supply I could go to 25000.
I made my own controller for the CNC that in receives gcode via serial interface. It then interpretes this code and controls all axis for linear movement, curves etc.
This controller also generates the pwm signal to the brushless motor-controller.
Motor timing is handled by my controller so that any pc can be used to send the gcode.
I've just built a similar spindle with an ER11 spindle with 8mm shaft. What kind of PSU are you using? I'm having trouble finding anything that's up to the task of me sending this spindle into metal. Only thing I can think of using is an ATX supply.
HammerFET 1 week ago
@HammerFET Nice! I suggest you get a industrial psu, or use an atx.
I found a main motor supply at goodluckbuy which does 36v 9.7 amps. It works for my axis motors. I use 12v 45A for my spindle.
1kreature 1 week ago
Hi,
Really interested to know more about how this is assembled, I seen the link for the speed controller but how is it assembled onto the spindle and how you are controlling the speed? Also will this setup work with any CAM controller software or just yours?
BaiCam1 2 weeks ago
Hi,
I'm building a tiny CNC machine for milling PCB. Did you like the dremel chuck? I'm planning to buy such a chuck and make a beared spindle attached to a brushed DC-motor which does around 12k rpm at 12v. I read a lot about the chuck not being centered. Did you have this problem?
knutselman 3 months ago
@knutselman No. The dremel chuck is not precise enough for pcb-milling. It has a lot of runout and in addition the threads on the chuck are not true, making it angle randomly to one side when tightened. The error is small, but noticeable and differs from unit to unit.
1kreature 3 months ago
Could you please tell me how did you couple the chuck to the motor's shaft? I've been looking for something off the shelf and had no luck. thank you!!
soulstudio 5 months ago
@soulstudio On this version I machined an adapter to fit on the shaft, and with the same threading as the tiny chuck.
I made a new version later with extra support-bearings and it uses a standard 1/4" chuck.
Both versions required a lathe to make though. To couple my new version to the motor I used a shaft-coupler.
1kreature 5 months ago
@1kreature Ah, thanks, well, looks like I have to put it on hold for now. I was thinking about something like a "double sided chuck" similar design as an ER style chuck, but with a threaded tubing in the middle and able to tighten up on both side... just an idea.
soulstudio 5 months ago
@soulstudio I would suggest you look at those cheap dremel tools with flex-tube on em. Clamping the flex-end will be much simpler. It also solves the drive-coupling.
Alternatives really require tools to machine parts.
1kreature 5 months ago
@soulstudio I don't think that would work unless you use all reverse threads on one end...
WTREMMEL 3 months ago
whats the name of the spindle you are using?
ip1shevlin 10 months ago
2 more questions... is the pwm input from a servo tester or TX? and what are you using for a power supply to the spindle? I have several large brushless motors similar to yours but they are all too low a kV to make any reasonable rpm. thx
HHO95667
hho95667 1 year ago
@hho95667 At the moment I run my spindle-system from a 12v supply. This gives me a maximum of 17000 rpm. If I had a higher voltage supply I could go to 25000.
I made my own controller for the CNC that in receives gcode via serial interface. It then interpretes this code and controls all axis for linear movement, curves etc.
This controller also generates the pwm signal to the brushless motor-controller.
Motor timing is handled by my controller so that any pc can be used to send the gcode.
1kreature 1 year ago
@1kreature
Nice job, very creative on your part
hho95667 1 year ago
What are you using to control the speed on the outrunner motor?
hho95667 1 year ago
@hho95667 Right now I use a Castle Creations Phoenix 10 brushless controller in heli-mode (to give constant velocity based on pwm input).
1kreature 1 year ago