On 1/22/23 04:54, Robin Szemeti via Emc-users wrote:
Yep, I have used steppers, servos, optical encoders with EMC etc etc in the
past, however, on this particular device, I am not going to try and hack
the mechanicals apart to start changing stuff. It's a high quality bit of
military kit that
Yep, I'm planning to use the Mesa resolver boards, simply because I already
have a fair bit of Mesa kit. I expect resolution to be 14 bits and
accuracy to be 12 bits.
On Sun, 22 Jan 2023 at 16:52, Jon Elson wrote:
> On 1/21/23 19:34, Robin Szemeti via Emc-users wrote:
> > One thing that might
sön 2023-01-22 klockan 10:51 -0600 skrev Jon Elson:
> On 1/21/23 19:34, Robin Szemeti via Emc-users wrote:
> > One thing that might cause some ... well, "issues" is my resolvers
> > are used
> > to determine the absolute angular position of my two rotational
> > axes, ie
> > they are driven off
On 1/21/23 19:34, Robin Szemeti via Emc-users wrote:
One thing that might cause some ... well, "issues" is my resolvers are used
to determine the absolute angular position of my two rotational axes, ie
they are driven off the axes themselves after the gearing, not off the
motors before the
Hi Chris,
An interesting device, but you are making a fundamental mistake in
confusing resolution with accuracy. If you read the datasheet, they make
no claims whatsoever about accuracy, if it was good, I am sure they would
mention it. That said, I would reasonably expect them to achieve +- 5
Yep, I have used steppers, servos, optical encoders with EMC etc etc in the
past, however, on this particular device, I am not going to try and hack
the mechanicals apart to start changing stuff. It's a high quality bit of
military kit that has presumably worked well enough in its previous life,
On 1/21/23 20:20, Robin Szemeti via Emc-users wrote:
That looks like a useful module ... sine for one of the coils, cosine for
the other, and simply multiply the cosine signal by the servo drive signal
+1 goes one direction, -1 goes the other and anything in between is just
slower ...
I have a
You can simplify this if you replace the resolvers with magnetic encoders.
They cost $4 each and come mounted to PCBs and with a magnet. What you
do is super-glue the magnet to the shaft end and then face the chip at the
magnet with an about 1mm air gap. The chip tells you the shaft angle to
One thing that might cause some ... well, "issues" is my resolvers are used
to determine the absolute angular position of my two rotational axes, ie
they are driven off the axes themselves after the gearing, not off the
motors before the gearing. This may prove to be a bit "interesting" .. but
That looks like a useful module ... sine for one of the coils, cosine for
the other, and simply multiply the cosine signal by the servo drive signal
+1 goes one direction, -1 goes the other and anything in between is just
slower ...
I have a company that manufactures audio amps, driver stages
On 1/21/23 06:25, Robin Szemeti via Emc-users wrote:
So, in a vaguely CNC related folly I have purchased a 2 axis military dish
mount for radio stuff (moonbounce, if you must know)
My plan is to control it from EMC, with a Mesa anything io card and the
resolver interface, I already have
Sure, I could do it on an ESP32 ... and the two axes of resolver feedback,
with the reference generator for the resolvers? and of course I'll need
some sort of graphical interface to show the current position, and an
interface to an external keypad or somesuch for intial setup and
establishing
This is a job best done on a $5 microcontroller, like the ESP32. You can
even program the thing in Python to do what is needed. You can generate
the AC as a 3-volt signal to an analog pin and then amplify it.
Microcontrollers have come a long way. ESP32 is a dual-core 32-bit CPU
with
> On 21 Jan 2023, at 12:26, Robin Szemeti via Emc-users
> wrote:
>
> Is it possible to use HAL or something to generate the variable level 50Hz
> servo drive signals and output them from the PWM outputs on the resolver
Updating the analog output at 1khz will probably give a good enough sine
So, in a vaguely CNC related folly I have purchased a 2 axis military dish
mount for radio stuff (moonbounce, if you must know)
My plan is to control it from EMC, with a Mesa anything io card and the
resolver interface, I already have various Mesa cards under EMC, so thats
not an issue and I
15 matches
Mail list logo
