> From: Chris Albertson [mailto:albertson.ch...@gmail.com]
>
> I think his method would work for your mill. Yes the tool pushed the
> table and the table moves.
How does he know the table moves?
Unless the encoder is a scale physically connected to the table he has no
feedback on where
I think it is just easy to have 2 pid's and sum them.. (one on the motor
encoder with P,D and feed forward - the other with scales and the I term)
Then you are not re-writing the pid component for some odd corner case.
sam
On Mon, Jan 3, 2022 at 10:36 PM gene heskett wrote:
> On Monday,
On Monday, January 3, 2022 11:00:54 PM EST Sam Sokolik wrote:
> I think this just would work with linuxcnc and scales + motor encoders.
> WIth the scales using only I in the 2 pid loops - it would be constantly
> correcting backlash to keep the position.. (that is what the G did)
>
> sam
Or,
On Monday, January 3, 2022 11:00:54 PM EST Sam Sokolik wrote:
> I think this just would work with linuxcnc and scales + motor encoders.
> WIth the scales using only I in the 2 pid loops - it would be constantly
> correcting backlash to keep the position.. (that is what the G did)
>
> sam
This
I think this just would work with linuxcnc and scales + motor encoders.
WIth the scales using only I in the 2 pid loops - it would be constantly
correcting backlash to keep the position.. (that is what the G did)
sam
On Mon, Jan 3, 2022 at 9:50 PM Chris Albertson
wrote:
> I think his method
I think his method would work for your mill. Yes the tool pushed the
table and the table moves. What he does is not just a double loop. He
models the movement of the table and predicts how it will move.To do
this on a mill you would need encoders on the table and then run a
calibration
Interesting concept. I notice that although he showed his finger pushing on
the jaws (and text said compensation turned off) we never saw him disturb the
jaws with compensation on. That he can position accurately is pretty cool.
But backlash on my X axis results in the milling cutter pulling
This has been done at a bigger scale... (2 feedback loops)
https://web.archive.org/web/20160222165548/http://jmkasunich.com/cgi-bin/blosxom/shoptask/wichita-trip-02-20-08.html
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Combining_Two_Feedback_Devices_On_One_Axis
On Mon, Jan 3, 2022, 8:42 PM Chris
CNC is about precision motion control. Here is a new idea where this
builder gets 0.05mm accuracy but uses hobby level R/C servo Not only that,
but he connects three of these in series, one to the next to the next so
all the backlashes and poor tolerances add together. Then he uses this to
do
That patent mentions the need for a sun gear. Not sure it's exactly the same
since this one doesn't.
> -Original Message-
> From: fxkl47BF--- via Emc-users [mailto:emc-users@lists.sourceforge.net]
> Sent: January-03-22 10:47 AM
> To: emc-users@lists.sourceforge.net
> Cc:
Likely for the 0.5 module setup these would work.
https://www.amazon.com/uxcell-6812ZZ-Groove-Bearings-Shielded/dp/B082PQ1NCY/ref=pd_sbs_1/136-5776133-4069347
They have an ID of 60mm which is what I set the 0.5module ring gear OD to. So
one could make the ring gear body a bit wider with a raised
Large ring bearings are not crazy-expensive. I was thinking about using
some in a robot leg design. This one could work for your size reduction
drive. Use them in pairs spaced as far apart as possible. They are deep
groove so they can take some axial load. With wide enough spacing you
don't
On Mon, 3 Jan 2022, John Dammeyer wrote:
> Just go back on this subject to older postings from Todd where he posted the
> FreeCAD files. I then used those to create step files and loaded them into
> AlibreCAD. Since then I've figured out how to make gears in AlibreCAD which
> had a Python
Just go back on this subject to older postings from Todd where he posted the
FreeCAD files. I then used those to create step files and loaded them into
AlibreCAD. Since then I've figured out how to make gears in AlibreCAD which
had a Python Script that used diameter and # of teeth. I
I believe some of you have a Grizzly G0602 lathe.
I need to replace the head stock bearings.
Some years back there was a mailing list on yahoo for 10x22 grizzly.
I seem to remember there was talk of upgrading to taper roller bearings.
Has anyone here done that?
Does it sound like a good idea or
January 3, 2022 9:54:10 AM CET John Dammeyer wrote:
For fun I created Todd's version with 0.5module gears. The OD of the assembly
is now 60mm compared to 150mm. It would now be possible to choose a far east
harmonic drive tapered roller assembly to hold the driven gear in place.
Although they
On Mon, 3 Jan 2022 at 08:57, John Dammeyer wrote:
>
> and then some sort of broaching/indexing to create the two ring gears
Have you seen: https://youtu.be/VJOem40ggkI?t=1167
(Home-shop gear skiving)
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the
For fun I created Todd's version with 0.5module gears. The OD of the assembly
is now 60mm compared to 150mm. It would now be possible to choose a far east
harmonic drive tapered roller assembly to hold the driven gear in place.
Although they are expensive.
Not sure what type of bearings,
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