Kirk Wallace wrote:
> On Sun, 2008-07-20 at 16:30 -0400, Kenneth Lerman wrote:
>> What do you mean by "encoder is in an invalid position". Every position
>> read from an absolute encoder is valid in the sense that it reflects the
>> actual position of the encoder within its tolerance.
>
> I do
On Sun, 2008-07-20 at 16:32 -0400, John Kasunich wrote:
...
> I wonder if Kirk is thinking of (or already has) something like the tool
> turret "encoder" on the Mazak at the CNC workshop? That machine has
> five prox switches that generate a 5 bit code to indicate which tool is
> selected. It is
On Sun, 2008-07-20 at 16:30 -0400, Kenneth Lerman wrote:
> What do you mean by "encoder is in an invalid position". Every position
> read from an absolute encoder is valid in the sense that it reflects the
> actual position of the encoder within its tolerance.
I don't think it does. Every edge f
Kenneth Lerman wrote:
> What do you mean by "encoder is in an invalid position". Every position
> read from an absolute encoder is valid in the sense that it reflects the
> actual position of the encoder within its tolerance.
>
> If you used a 256 count encoder for your 24 positions, each tool
What do you mean by "encoder is in an invalid position". Every position
read from an absolute encoder is valid in the sense that it reflects the
actual position of the encoder within its tolerance.
If you used a 256 count encoder for your 24 positions, each tool
position would correspond to 256
On Sun, 2008-07-20 at 14:28 -0400, Kenneth Lerman wrote:
> When you power up, you read the 8 bit value (for a 256 position absolute
> encoder). That will give you an unambiguous position.
>
> Ken
On my original design for a tool changer encoder, I had a sprocket
engaging the carousel chain:
htt
On Sun, 2008-07-20 at 11:30 -0700, Peter C. Wallace wrote:
... snip
> The Austria Microsystems (SP?) magnetic absolute encoders might be a good
> choice.
... snip
Like this:
http://www.austriamicrosystems.com/03products/products_detail/AS5030/description_AS5030.htm
This seems to be perfect for
When you power up, you read the 8 bit value (for a 256 position absolute
encoder). That will give you an unambiguous position.
Ken
Kirk Wallace wrote:
> On Sun, 2008-07-20 at 14:04 -0400, Kenneth Lerman wrote:
>> Kirk,
>>
>> See: http://en.wikipedia.org/wiki/Gray_code
>>
>> Gray codes have the p
On Sun, 20 Jul 2008, Kirk Wallace wrote:
> Date: Sun, 20 Jul 2008 11:01:21 -0700
> From: Kirk Wallace <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Continuous and Absolute
>
> I was reviewing a document
On Sun, 2008-07-20 at 14:04 -0400, Kenneth Lerman wrote:
> Kirk,
>
> See: http://en.wikipedia.org/wiki/Gray_code
>
> Gray codes have the property that every position is a valid value. Each
> change in position involves a change in only a single bit.
>
> Absolute rotary encoders typically use gr
Kirk,
See: http://en.wikipedia.org/wiki/Gray_code
Gray codes have the property that every position is a valid value. Each
change in position involves a change in only a single bit.
Absolute rotary encoders typically use gray code (or something like it).
They are available in many resolutions.
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