Freqmod.o vs Stepper.o
Posted by
ajv2803959
on 2002-03-20 14:56:39 UTC
Let say:
I want to make rapids in range 2500mm/min.
My Hard:
I have a 5mm pitch leadscrew, and my motor give up in half step
mode 360 steps = 1 rev.
Computer is a PII 233 , 32 Mgas
My Soft:
EMC 2.2.16, kernel 2.2.18 patched with rtlinux 3.0
My Reasoning.
Let suppose
Parallel port is able to give up 12000 Hz/s or 12000 steps/s, if my
machine has 3 axis
12000 Hz/s / 3 = 4000 Hz/s per axis.
Rev/s
4000Hz/s / 360 = 11,11 rev/s
Travel in 1 second
11,11rev/s * 5 mm = 55mm/s
Time in order to get the long travel (2500mm)
2500mm/55mm/s= 45,45 s . Much better than above asumption.
OK, I know, it would be a little bit more due at accel parameter.
1 ) Is it possible dont get ragged pulses at this feed rate ?
2) I have read that a 486/66 MHZ is able to give up 28800Hz/s
3) Is there any parameter in order to define the spacing between
pulses ? For example 50 microseconds.
4)Could I get the same rate than above with a microstep drive. For
example a G201 in resolution mode = 10.
I think no. We will need a hardware step pulse generator or an
advanced driver as G210.
5) How may steps is stepper.o able to give in order to don´t get
ragged pulses ?
OK, could I drive microstepping drivers with EMC at full resolution
(10) getting reasonable rate in rapids. I would like microstepping in
order to get down resonance, but I would like MAX_VELOCITY = 66 or
better too. I would try the API driver that Tim is selling, but if I
can drive in half step mode only, 200 $ is a lot of for 3 axis.
Are there affordables hardware steps pulse generator ?
Freq.o
I am trying freqmod.o, but the MAX_VELOCITY that I am getting is 8
mm/s. I have tried in a PII 333 Mhz but the MAX_VELOCITY=12 mm/s. Is
possible such different between stepper.o and freqmod.o.
Is possible in a PII 233 get MAX_VELOCITY = 44 mm/s.
When we might use freq.o vs stepper.o ?
Thank in advance
I want to make rapids in range 2500mm/min.
My Hard:
I have a 5mm pitch leadscrew, and my motor give up in half step
mode 360 steps = 1 rev.
Computer is a PII 233 , 32 Mgas
My Soft:
EMC 2.2.16, kernel 2.2.18 patched with rtlinux 3.0
My Reasoning.
Let suppose
Parallel port is able to give up 12000 Hz/s or 12000 steps/s, if my
machine has 3 axis
12000 Hz/s / 3 = 4000 Hz/s per axis.
Rev/s
4000Hz/s / 360 = 11,11 rev/s
Travel in 1 second
11,11rev/s * 5 mm = 55mm/s
Time in order to get the long travel (2500mm)
2500mm/55mm/s= 45,45 s . Much better than above asumption.
OK, I know, it would be a little bit more due at accel parameter.
1 ) Is it possible dont get ragged pulses at this feed rate ?
2) I have read that a 486/66 MHZ is able to give up 28800Hz/s
3) Is there any parameter in order to define the spacing between
pulses ? For example 50 microseconds.
4)Could I get the same rate than above with a microstep drive. For
example a G201 in resolution mode = 10.
I think no. We will need a hardware step pulse generator or an
advanced driver as G210.
5) How may steps is stepper.o able to give in order to don´t get
ragged pulses ?
OK, could I drive microstepping drivers with EMC at full resolution
(10) getting reasonable rate in rapids. I would like microstepping in
order to get down resonance, but I would like MAX_VELOCITY = 66 or
better too. I would try the API driver that Tim is selling, but if I
can drive in half step mode only, 200 $ is a lot of for 3 axis.
Are there affordables hardware steps pulse generator ?
Freq.o
I am trying freqmod.o, but the MAX_VELOCITY that I am getting is 8
mm/s. I have tried in a PII 333 Mhz but the MAX_VELOCITY=12 mm/s. Is
possible such different between stepper.o and freqmod.o.
Is possible in a PII 233 get MAX_VELOCITY = 44 mm/s.
When we might use freq.o vs stepper.o ?
Thank in advance