I was reviewing a document from Sanyo covering AC servo motors:
http://motiononline.com/PDF%20Files/Handbook/Handbook.pdf
It talked about the AC system needing absolute shaft position in order
to duplicate a brushed commutator in software. It was indicated that a
low resolution absolute encoder
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.
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 gray code
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)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: [Emc-users]
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 property
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
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
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
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 from
Well, you have lots more homework to do... For the gecko drives you only need a
breakout board like a C11 (I think) from CNC4PC. I prefer automationdirect
steppers as they are cost effective. Keep in mind the larger the steppers the
slower
they go. Looks like you have got a firm bite on the
I am researching on using EMC2 controller in a real VMC. I have some base
knowledge about EMC2. But I wonder much about HW that I will use to connect
with the EMC2. I see some HW in the web linuxcnc.org. But I don't know what
kind is the most suitable for VMC and has a good price.
Please give me
Hi,
I have made 5 machines so far and I am working on my sixth.
Of the two most economically successful parts I have made so far, one
costs 50 cents to buy and I use about 20 a month, the other one costs
about 9 dollars to buy and I use about 4 a month.
Each month CNC saves me
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