Hazarding a guess here so...
It appears as if you are switching the direction signals at pwm frequency. This
would switch the high side fets and those are slow and do have high switching
losses. The intended design is for the low side fets (controlled by the PWM
input) to be off until the
On Monday 26 October 2020 22:33:36 Chris Albertson wrote:
> Gene, I've got a ton of these chips driving motors. They work fine.
> Just write the software to the datasheet spec. If the chip is getting
> hot and the motor is not mechanically stalled then you are doing
> something wrong. For
Gene, I've got a ton of these chips driving motors. They work fine. Just
write the software to the datasheet spec. If the chip is getting hot and
the motor is not mechanically stalled then you are doing something wrong.
For debug/development replace the motor with a 100R power resister and
On Monday 26 October 2020 20:33:40 Jon Elson wrote:
> On 10/26/2020 06:48 PM, Gene Heskett wrote:
> > But the switching losses in the olimex board, even at only
> > a 1 kilohertz pwm are killers, getting it hot enough to
> > burn a finger in just 2 or 3 seconds. So, I need a d2a to
> > drive one
Hi John,
I ran into issues like that. different cards might give you different
issues, some linux-es can be picky like that (especially when you'd have
to mess with nouveau)
The firmware it is talking about is the linux firmware I think, not the
firmware on the board.
Did you do the
Hello John,
I had the same issue and I solved the problem using the "nomodeset" option
at the grub.
This should help:
https://askubuntu.com/questions/38780/how-do-i-set-nomodeset-after-ive-already-installed-ubuntu
El lun., 26 oct. 2020 a las 22:30, John Figie ()
escribió:
> I forgot to add
I forgot to add a subject
John Figie
On Mon, Oct 26, 2020 at 8:18 PM John Figie wrote:
> Dear LinuxCNC users
>
> I started a project about 6 years ago that was delayed because of several
> personal issues. I am now ready to begin putting together a computer that I
> want to use to control a
Dear LinuxCNC users
I started a project about 6 years ago that was delayed because of several
personal issues. I am now ready to begin putting together a computer that I
want to use to control a lathe. I want to install Debian 10 (buster) on my
PC.
I have 2 identical older MBs Asus M5A 78L-M LX.
On 10/26/2020 06:48 PM, Gene Heskett wrote:
But the switching losses in the olimex board, even at only
a 1 kilohertz pwm are killers, getting it hot enough to
burn a finger in just 2 or 3 seconds. So, I need a d2a to
drive one of the 150 watt class D audio boards after
shorting the inputs
On Monday 26 October 2020 18:32:00 Jon Elson wrote:
> >> On Monday 26 October 2020 14:16:55 Chris Albertson wrote:
> >>> 20% PWM duty cycle and a 24V power supply is about 4.8 volts to
> >>> the motor. Many DC motors will not move at 20% of rated volts.
> >>> I'd not be surprised if it took 10
On Monday 26 October 2020 14:16:55 Chris Albertson wrote:
20% PWM duty cycle and a 24V power supply is about 4.8 volts to the
motor. Many DC motors will not move at 20% of rated volts. I'd not
be surprised if it took 10 or 12 volts to overcome internal
friction.
A standard test for servo
On Monday 26 October 2020 14:56:37 Gene Heskett wrote:
> On Monday 26 October 2020 14:16:55 Chris Albertson wrote:
> > This is hard to follow because you are referring to pin number on a
> > PCB with no schematic. How do these relate to the pins on the
> > driver chip?
>
> Ahh, but the
On Monday 26 October 2020 14:16:55 Chris Albertson wrote:
> This is hard to follow because you are referring to pin number on a
> PCB with no schematic. How do these relate to the pins on the driver
> chip?
Ahh, but the schematic is downloadable from the olimex site. Printed in
color on
This is hard to follow because you are referring to pin number on a PCB
with no schematic. How do these relate to the pins on the driver chip?
Also, 10 KHz is at the limit. For initial testing better, I think to work
near the midpoint of the acceptable range, perhaps 1KHz. Then after it
works
On Monday 26 October 2020 11:27:20 Alan Condit wrote:
> Hi all,
>
> I am trying to wrap my head around limit switches for my Grizzly G4000
> lathe that I have converted to CNC.
>
> The X limit switches are not a major problem. They always goes to the
> same spot. I have the X+ switch mounted.
Hi.
I ordered a Farand controls rotary inductosyn encoder off eBay some time
ago.
Normally I ship my eBay purchases to a forwarding company in Florida who
then consolidates a package and forwards that to me.
This time around they say that they say that they could not verify the
export
On Mon, 26 Oct 2020 at 15:29, Alan Condit wrote:
> I am having trouble figuring out the placement of the Z limit switch or
> switches
I was troubled by the same issue, and did some bodgery to make the
resolvers return an absolute position, so that now I can home without
moving.
This might be
On Sunday 18 October 2020 22:21:11 Chris Albertson wrote:
Advice on the OLIMEX board for a motor driver.
I have it wired up, I think. Grounded to system ground on pin 3, system
logic 5 volts on pin 2.
With complementary 5 volt dirs feeding ENA/ENB on pins 4-5 and a 5 volt
pwm on pin 6, the
If it is a small enough lathe - I would just take the tail stock off to
home.. (that is what I do on the emco)
Have a cam style follower. So it home somewhere halfway down the travel.
(so most of the time the tailstock is out of the way. (if it is past the
trip point - it will home the other
Hi all,
I am trying to wrap my head around limit switches for my Grizzly G4000 lathe
that I have converted to CNC.
The X limit switches are not a major problem. They always goes to the same
spot. I have the X+ switch mounted. Figuring out where to mount the X- switch
so it doesn’t interfere
Many moons ago, but sure we did experience some bad allergy reactions from
cutting fluid. Some fluids are prone bacteria growth and if the system
isn't cleaned regularly you may end up with a biohazard de luxe.
Don't ask me how I know, but the sanitation of 25 machines sized workshop
took a
21 matches
Mail list logo
