The OP said he needs a 1KHz sample rate. Those chips are about 50x to
slow. Doing both high resolution and high bandwidth will be a hard
problem.
On Wed, Sep 18, 2019 at 6:01 PM Nathan Hartman
wrote:
> On Wed, Sep 18, 2019 at 9:38 AM Curtis Dutton wrote:
>
> > On Tue, Sep 17, 2019 at 6:17
Standard strain gages have a usable resolution of about 6000, as far as I know.
> On Sep 18, 2019, at 7:58 PM, Nathan Hartman wrote:
>
> On Wed, Sep 18, 2019 at 9:38 AM Curtis Dutton wrote:
>
>> On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson >>
>> wrote:
>>
>>> If you want better than 16-b
On Wed, Sep 18, 2019 at 9:38 AM Curtis Dutton wrote:
> On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson >
> wrote:
>
> > If you want better than 16-bits and 1KHz then you also are going to need
> a
> > very good quality analog signal conditioning and instrumentation
> amplifier.
> > The analog
One way to measure force is with a spring. Force is measured by looking at
spring displacement. It is kind of like the load cell idea but you use
a spring scale.
Another way that is not quite to accurate is to measure the current in the
motor. Current is proportional to torque.
On Wed, Sep
my experiment is to use a force measuring device to proportionally control
torque output on a servo attached to a ball screw.
as a thought experiment imagine a platform hoisted by said ball screw. as
you added weight to the platform the motor torque would increase to offset
the weight and keep it
On Wed, 18 Sep 2019 at 18:27, Andy Howell wrote:
>
> I don't have a specific need for 2.8 over 2.7. I want to avoid
> installing 2.7 and having 2.8 come out soon after.
>
> Are there any reasons I should not attempt 2.8?
>
Not that I can see. It has a few subtle problems still, but only in unusu
On Wednesday 18 September 2019 17:15:24 Andy Howell wrote:
> On 9/18/19 2:27 PM, Gene Heskett wrote:
> > On Wednesday 18 September 2019 12:46:15 Andy Howell wrote:
> >> Our high school has a couple gantry based CNC routers running
> >> version 2.5. From perusing the list, it seems like 2.8 is fair
On 9/18/19 2:27 PM, Gene Heskett wrote:
On Wednesday 18 September 2019 12:46:15 Andy Howell wrote:
Our high school has a couple gantry based CNC routers running version
2.5. From perusing the list, it seems like 2.8 is fairly stable even
though its not released. I've got a pendant and some oth
On Wednesday 18 September 2019 12:46:15 Andy Howell wrote:
> Our high school has a couple gantry based CNC routers running version
> 2.5. From perusing the list, it seems like 2.8 is fairly stable even
> though its not released. I've got a pendant and some other add-ons I
> want to install. I'd ra
Our high school has a couple gantry based CNC routers running version
2.5. From perusing the list, it seems like 2.8 is fairly stable even
though its not released. I've got a pendant and some other add-ons I
want to install. I'd rather put the effort into getting them working on
a new system th
in any case, even with lower 16-bit precision, the most important part of
the design is the analog portion that sits between the load cell and the
A/D converter.
On Wed, Sep 18, 2019 at 6:38 AM Curtis Dutton wrote:
> Chris thanks for the info.
>
> I'm not exactly certain at this point what pre
On 9/18/2019 11:15 AM, Jon Elson wrote:
On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson
wrote:
If you want better than 16-bits and 1KHz then you also are going to
need a
very good quality analog signal conditioning and instrumentation
amplifier.
I've never heard of anybody getting 16-bit res
MAX11905 might do the job. 20 bit. but spendy. probably $50 in singles.
QSPI and SPI for interfaces. data rate 1600 ksps. SAR > 16 bit gets
really touchy... CMRR, noise, etc. Good luck.
On 9/18/19 7:01 AM, Curtis Dutton wrote:
Right now my test set up is going to consist of a 6i25, 7i85 and an
On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson
wrote:
If you want better than 16-bits and 1KHz then you also are going to need a
very good quality analog signal conditioning and instrumentation amplifier.
I've never heard of anybody getting 16-bit resolution from a
load cell or strain gauge.
Right now my test set up is going to consist of a 6i25, 7i85 and an 8i20. I
wonder if the 7i85 could expose a BSPI interface. Or could I tack a BSPI on
to the 6i25's spare 25 pin connector?
I also am considering just writing a parallel port driver running at some
higher rate than the servo thread
Chris thanks for the info.
I'm not exactly certain at this point what precision I need. I'll be
determining that experimentally later. I will keep in mind what you have
said, I'll deal with it after I get my hardware running.
On Tue, Sep 17, 2019 at 6:17 PM Chris Albertson
wrote:
> If you want
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