Re: [Emc-users] hair brained idea?

2022-12-04 Thread Gregg Eshelman via Emc-users 
There are some new slicer optimizations to make better use of 0.6mm nozzles. 
https://www.youtube.com/results?search_query=0.4mm+nozzles+just+became+obsolete


On Saturday, December 3, 2022 at 09:17:02 PM MST, Chris Albertson 
 wrote: 

a huge printer is not as usfull as you might think.  The nozzle is still
0.4 mm in diameter or close.  Print time is the cube of the linear
dimension of the parts you make,  Can you wait a week while the printer
runs.  What if a 1Kg spool of filament is not enough?


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Re: [Emc-users] hair brained idea?

2022-12-03 Thread gene heskett 

On 12/3/22 23:15, Chris Albertson wrote:

a huge printer is not as usfull as you might think.  The nozzle is still
0.4 mm in diameter or close.  Print time is the cube of the linear
dimension of the parts you make,  Can you wait a week while the printer
runs.  What if a 1Kg spool of filament is not enough?

Chuckle, one of the reasons I leave the bowden tube even after putting 
the ejector motor on the head, then I can follow the last of a spool 
thru it until the ejector grabs the new spool. I've also chased the 
prusa head and fed it a new spool many times.



I got an idea, see what Cura says.  Define a printer that large and slice
something and look at the weight and print time.


I did that for a 6 pack of vise housings on the ender5+, 21 days, but 
the y motor lost home when the infill started, 8 days into the job.



A more practical idea is to print the parts in sections and then glue or
screw the parts together.  It helps if the parts have some kind of self
alignment or keyway.


I do that with these housings, they are assembled with butterflys.


or huge parts, casting is better.   Print a mold, then fill it with plastic
resin that is mixed with chopped fiber.It makes really strong parts.
Then disassemble the mold and take the part out.

A big printer is no different at all from a milling machine, except that it
moves faster and does not need to be build as rigid as there is not cutting
force.So why not look up some CNC router projects?   It is a common
LinuxCNCproject.

I have a 6040 with totally new electronics. Its custom setup to carve 
the vise screw from hard maple and these printers will be used to make 
the rest of the assembly.



I would still use those closed loop steppers.   With a week-long print, you
do not want skipped steps.


Which is why I asked stepperonline for a quote on their nema-17 
stepper/servo with double shafts.Take care and stay well Chris


Cheers, Gene Heskett.
--
"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
Genes Web page 



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Re: [Emc-users] hair brained idea?

2022-12-03 Thread Chris Albertson 
a huge printer is not as usfull as you might think.  The nozzle is still
0.4 mm in diameter or close.  Print time is the cube of the linear
dimension of the parts you make,  Can you wait a week while the printer
runs.  What if a 1Kg spool of filament is not enough?

I got an idea, see what Cura says.  Define a printer that large and slice
something and look at the weight and print time.

A more practical idea is to print the parts in sections and then glue or
screw the parts together.  It helps if the parts have some kind of self
alignment or keyway.

or huge parts, casting is better.   Print a mold, then fill it with plastic
resin that is mixed with chopped fiber.It makes really strong parts.
Then disassemble the mold and take the part out.

A big printer is no different at all from a milling machine, except that it
moves faster and does not need to be build as rigid as there is not cutting
force.So why not look up some CNC router projects?   It is a common
LinuxCNCproject.

I would still use those closed loop steppers.   With a week-long print, you
do not want skipped steps.

On Sat, Dec 3, 2022 at 5:00 PM gene heskett  wrote:

> On 12/3/22 18:35, Chris Albertson wrote:
> > I don't know what your big-picture goal is,
>
> A 500mm Ender5+ and an 800+mm tronxy-400-pro, and maybe a 1000mm
> Saphire-5 plus eventually.
>
> but you can drive a normal
> > two-phase stepper in continuous, non-stepping mode.  In this mode they
> are
> > just like servomotors.  Then they attach a rotary encoder.  So
> > step-skipping is not going to happen as they don't step.
> >
> > Stepperonline sells these all setup and ready to go as drop-in
> replacements
> > for normal steppers.  The servo-loop is closed inside the driver
> > electronics so the computer just sees the usual sep/dir interface.
> >
> I am fam with that, I'm already using 4 of the nema 23 3 phase versions
> which are lots more efficient power wise, but didn't know it was
> available in nema 17's. I've asked for a quote for the bigger one in
> dual shaft.  Thank you, Chris. Take care & stay well.
>
> Cheers, Gene Heskett.
> --
> "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
> Genes Web page 
>
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] hair brained idea?

2022-12-03 Thread gene heskett 

On 12/3/22 18:35, Chris Albertson wrote:
I don't know what your big-picture goal is, 


A 500mm Ender5+ and an 800+mm tronxy-400-pro, and maybe a 1000mm 
Saphire-5 plus eventually.


but you can drive a normal

two-phase stepper in continuous, non-stepping mode.  In this mode they are
just like servomotors.  Then they attach a rotary encoder.  So
step-skipping is not going to happen as they don't step.

Stepperonline sells these all setup and ready to go as drop-in replacements
for normal steppers.  The servo-loop is closed inside the driver
electronics so the computer just sees the usual sep/dir interface.

I am fam with that, I'm already using 4 of the nema 23 3 phase versions 
which are lots more efficient power wise, but didn't know it was 
available in nema 17's. I've asked for a quote for the bigger one in 
dual shaft.  Thank you, Chris. Take care & stay well.


Cheers, Gene Heskett.
--
"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
Genes Web page 



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Re: [Emc-users] hair brained idea?

2022-12-03 Thread Chris Albertson 
I don't know what your big-picture goal is, but you can drive a normal
two-phase stepper in continuous, non-stepping mode.  In this mode they are
just like servomotors.  Then they attach a rotary encoder.  So
step-skipping is not going to happen as they don't step.

Stepperonline sells these all setup and ready to go as drop-in replacements
for normal steppers.  The servo-loop is closed inside the driver
electronics so the computer just sees the usual sep/dir interface.

On Sat, Dec 3, 2022 at 2:02 PM gene heskett  wrote:

> Greetings to all the other stepper experts here.
>
> I got the double ended motors for an Ender5+ today.
>
> Other than the paint job and wiring, leads instead of sockets, they look
> identical to the motor currently on the Ender5+ for Y drive. No
> perceived improvement.
>
> I can probably program klipper to drive then both with a separate 5160
> driver per motor, get another bracket, mount then butt to butt with one
> coil reversed, locked together with a 5mm to 5mm coupling,to maintain X
> squareness making them into one motor with twice the torque.
>
> The big IF is whether the drivers always power up at the same state
> before any move is commanded, I don't want x square to be a random
> driver power up fight.
>
> Its either make that work, or figure out some sort of a backlashless
> bevel gear from one of the 3 phase motors that are all nema-23's so far.
> That would be ideal if the fault line could be used to freeze things if
> it ever loses home by even one step. Something the 3 phase nema 23's can
> do automatically.
>
> Best antibacklash is not a bevel gear, but likely a jackshaft from the
> nema 23 to a short shaft where the nem-17 motor is now. Even a 1NM 3
> phase would be 200% of the torque of whats in there now.
>
> Which way, two nema-17 motors, or a nema 23 and a jackshaft with 30
> tooth pulleys, would you guys opt for?
>
> Thanks for your thoughts!
>
> Cheers, Gene Heskett.
> --
> "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
> Genes Web page 
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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[Emc-users] hair brained idea?

2022-12-03 Thread gene heskett 

Greetings to all the other stepper experts here.

I got the double ended motors for an Ender5+ today.

Other than the paint job and wiring, leads instead of sockets, they look 
identical to the motor currently on the Ender5+ for Y drive. No 
perceived improvement.


I can probably program klipper to drive then both with a separate 5160 
driver per motor, get another bracket, mount then butt to butt with one 
coil reversed, locked together with a 5mm to 5mm coupling,to maintain X 
squareness making them into one motor with twice the torque.


The big IF is whether the drivers always power up at the same state 
before any move is commanded, I don't want x square to be a random 
driver power up fight.


Its either make that work, or figure out some sort of a backlashless 
bevel gear from one of the 3 phase motors that are all nema-23's so far. 
That would be ideal if the fault line could be used to freeze things if 
it ever loses home by even one step. Something the 3 phase nema 23's can 
do automatically.


Best antibacklash is not a bevel gear, but likely a jackshaft from the 
nema 23 to a short shaft where the nem-17 motor is now. Even a 1NM 3 
phase would be 200% of the torque of whats in there now.


Which way, two nema-17 motors, or a nema 23 and a jackshaft with 30 
tooth pulleys, would you guys opt for?


Thanks for your thoughts!

Cheers, Gene Heskett.
--
"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
Genes Web page 


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