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-----Original Message-----
From: mach1mach2cnc@...
[mailto:mach1mach2cnc@...]On Behalf Of art
Sent: Saturday, June 03, 2006 4:01 PM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] RC servo signal - R/C brushless / brushed
spindle motor speed controller


Hi Manu:

If setting the scope to 2ms shows the right signal, and otrher setting do
not, then the scope is confusing you a bit. (Mach's not going to change the
signal based on the scope setting..:) )
So it sounds liek you need a 25ms base PWM freq. So set it to 40hz. That
at least will bring it in line. RC SErvos can be picky I thnk about the
signal they recieve, the PWM is not really designed for them, all you can
really do is experiment to see what the effect is. Hopefully youll find some
setting of that which is usefull..

Thanks,
Art
www.artofcnc.ca

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----- Original Message -----
From: "Manu CNC" <mansys@...>
To: <mach1mach2cnc@...>
Sent: Saturday, June 03, 2006 4:46 AM
Subject: RE: [mach1mach2cnc] RC servo signal - R/C brushless / brushed
spindle motor speed controller

RC-Servo signal:


Manu (@manu, manutoys, vantiv)


-----Original Message-----
From: mach1mach2cnc@...
[mailto:mach1mach2cnc@...]On Behalf Of Manu CNC
Sent: Saturday, June 03, 2006 9:39 AM
To: mach1mach2cnc@...
Subject: RE: [mach1mach2cnc] RC servo signal - R/C brushless / brushed
spindle motor speed controller


Hi Art,

My setup :
Kernel: 25,000Hz
Spindle Base Freq: 50Hz
Min, - Max Pully ration: 1 to 10,000

After scope measurements I get this !

If I set the scope resolution to 2ms/div I do get the correct signal!!

_|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__

_|_ 2ms/div
0 2 4 6 8 0 2 4 6 8 0 2 4 6 8 0 2 4
6 8
1 2 3
rpm
200 _||______________________________________||__________________________

300 _||____________________________________||________________________

400
_||___________________________________||________________________


BUT, if I zoom out to 0.2 SECONDS/div I get this: distance between the
pulses 1.5 SECONDS !!!
Zooming into a pulse, I get the signal as above!

rpm
200

_||______________________________________||_________________________________

_________

4000_||___________________||__________

______________

9000_|||

|_____

Mybe my scope is confusing me

Anyway, I also attached a RC-servo motor to it and it moves in an
accelerated way to one extreme, whatever rpm speed setting: start slowly
and
accelerate at the end.

I can confirm that an RC-PWM-signal are Pulses of 1 to 2 msec long
repeated
every 20-30 msec!


Manu (@manu, manutoys, vantiv)


-----Original Message-----
From: mach1mach2cnc@...
[mailto:mach1mach2cnc@...]On Behalf Of art
Sent: Saturday, June 03, 2006 1:03 AM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] RC servo signal - R/C brushless / brushed
spindle motor speed controller


Manu:

Well, if you select 50hz as the base frequency, and set the Max Pulley
ratio to 10,000 and only select speeds from 200 - 400RPM thats abotu what
you woudl get. A 1 - 2ms pulse every 20ms.
:)

Thanks,
Art
www.artofcnc.ca

Videos And Support Forums
Users Map:
----- Original Message -----
From: "Manu CNC" <mansys@...>
To: <mach1mach2cnc@...>
Sent: Friday, June 02, 2006 6:04 PM
Subject: RE: [mach1mach2cnc] RC servo signal - R/C brushless / brushed
spindle motor speed controller

Grrrrrrr,

Is it possible ? yes :-) or no :-/

_|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__

_|_ 2ms/div
0 2 4 6 8 0 2 4 6 8 0 2 4 6 8 0 2
4
6 8
1 2 3
RC-Signal every 20mS generate a pulse between 1ms and 2ms:
10% _||______________________________________||__________________________
50% _||____________________________________||________________________

100%_||___________________________________||________________________

Mach3 signal ?
10% _||______________________________________||__________________________
50%

_||___________________||______________

__________

100%_|||

|_____


Manu (@manu, manutoys, vantiv)

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