On 8/3/24 12:23, Leonardo Marsaglia wrote:
As a roughing cut thats pretty decent. Can your X move like that while
loaded with the grinders weight? My grinder is a 1/4 shank and several
lbs. With an 8mm x screw, that much weight would be pushing that screw
pretty hard.
I didn't weigh the entire X chariot so I'm dimensioning it just based on
other machines of similar size. I'm using a 40 mm ballscrew (ground or
rolled that's yet to be determined) with 5 mm of lead. That will be
commanded using a 3.8 KW servo motor which can output 15 NM of nominal
torque. Since this is a grinder and the part is going to spin slower than a
turning operation I really don't mind a lot about max speed on the X axis
but more about max acceleration.
Good thinking. And here I've been extremely impressed with the decel
damping associated with the stopping on target that the stepper/servo's
can do in place of the 2 to 7 microsteps of overshoot a normal stepper
might do getting stopped. But watching the error in plastic on a much
faster 3d printer just prompted me to switch the psu out for one with 2
amps more surge and 30 volts for nearly a 2x speed boost. The clue was
an 8mm circular hole with a straight line from 6 to 9 oclock when both
motors were moving at the same time. My theory was that it took the
short cut cuz the psu was borderline puny. I'll find out for sure when
the bearings for the Y carriages arrive from tronxy around the end of
next week and I make the final adjustments to square up the belt paths
on that corexy printer. Corexy's have to be dead square in order to
maintain the belt tension as it moves. The advantage is that no motor
is flying weight so it can lay plastic 2-10 times faster.
Are you grinding for final finish on those cams or just keeping the tool
in the video razor sharp?
El vie, 2 ago 2024 a las 14:37, gene heskett (<ghesk...@shentel.net>)
escribió:
On 8/2/24 12:23, Leonardo Marsaglia wrote:
Hello Gene, I hope you're doing well!
Here is a little footage of the fastest I've moved the X axis on the
mazak:
https://youtube.com/shorts/fx6Elmy2GB4?si=oYQ7x1yheyhZOh5-
As a roughing cut thats pretty decent. Can your X move like that while
loaded with the grinders weight? My grinder is a 1/4 shank and several
lbs. With an 8mm x screw, that much weight would be pushing that screw
pretty hard.
Being almost a square and considering the circunscribed diameter is about
37 mm is pretty good. For the X axis I have a max speed of 500.0 mm/sec
and
10000.0 mm/sec^2 of max acceleration. I kind of have to correct the jerk
for this axis because for some shapes I can notice it's a little too
much.
But for the most part I'm ok with the way it works.
Yes, makes it look easy.
I have done that, but the spindle speed is suprisingly slow if X is
slow.
Well, I'm designing this machine to have a slight better response than
the
Mazak, but also being a grinding machine I don't really need that much
RPMs
on the part spindle so for the majority of parts we make it will be ok.
I'll be posting videos as soon as the machine is ready!
I might add that my Sheldon is the first machine I put the
stepper/servo's on. They doubled the speeds.
El vie, 2 ago 2024 a las 12:55, gene heskett (<ghesk...@shentel.net>)
escribió:
On 8/2/24 10:52, gene heskett wrote:
On 8/2/24 05:45, Leonardo Marsaglia wrote:
So this would also work for a mill that has an AC Servo running
step/dir.
Once the motor is connected to the spindle with a toothed belt
rather than
V belt.
I must be missing some context here. I have been feeding back for
spindle speed control, an encoder generated ABX set of quadrature
signals generated by ats-667's which are watching the spindle backgear
teeth go by, for about a decade. What has the presence or absence of a
v-belt in the path got to do with it?.
Cool!
I have the same doubt about the kind of belt I should use. In theory,
several V belts well tensioned should work perfectly without slipping
and
the encoder on the spindle (this one of course coupled with a timing
belt)
should be able to keep up with the position and nothing should go
wrong.
The lathes we have all work this way and I have never experienced belt
slipping. But for some reason I feel more confident using timing belts
all
the way. I don't know if this is an overkill and I should go with the
simpler V belts. Remember that this machine is going to be grinding
cams
and eccentrics.
I have done that, but the spindle speed is suprisingly slow if X is
slow.
El vie, 2 ago 2024 a las 6:33, Leonardo Marsaglia
(<ldmarsag...@gmail.com>)
escribió:
Thanks Andy for the link! Now it's time to play a little bit with the
config and make it work :)
El dom, 28 jul 2024 a las 6:21, andy pugh (<bodge...@gmail.com>)
escribió:
On Sat, 27 Jul 2024 at 18:41, Leonardo Marsaglia
<ldmarsag...@gmail.com>
wrote:
For this, I think I read there's a caxis.comp module that If I'm
not
mistaken Andy wrote.
Is there a place to get that file? Because I couldn't find it yet.
https://forum.linuxcnc.org/10-advanced-configuration/42171-spindle-step-dir-servo-ramp-down-before-stop-on-m-stop-command?start=120#209694
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912
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Cheers, Gene Heskett, CET.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law
respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
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_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
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