pantograph 3d printer
Posted by herve robert
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pantograph 3d printer November 20, 2018 03:39PM |
hello folk's
I've got this idea since a couple of weeks.
see pictures.
it's just a model.
lot to do before it works. but it seems interesting.
+
Edited 3 time(s). Last edit at 11/20/2018 03:51PM by herve robert.
I've got this idea since a couple of weeks.
see pictures.
it's just a model.
lot to do before it works. but it seems interesting.
Edited 3 time(s). Last edit at 11/20/2018 03:51PM by herve robert.
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Re: pantograph 3d printer November 21, 2018 12:10PM |
hi everyone
some features "expected".
- balanced-arm with a counterweight
- least amount of parts, no or no long belts, no rods, ..
- majority of printed (or cnc) parts
- easy to built
- bargain price but good quality too
- (θ,t) simple bearing like in record player turntable
- small printing size (about pantograph, I'm worried about the size of he arm. if it's too long, it could be wagging (and so poor accuracy).
maybe it's not a good design and it'll never work but someone could have a better idea... who knows ?
some features "expected".
- balanced-arm with a counterweight
- least amount of parts, no or no long belts, no rods, ..
- majority of printed (or cnc) parts
- easy to built
- bargain price but good quality too
- (θ,t) simple bearing like in record player turntable
- small printing size (about pantograph, I'm worried about the size of he arm. if it's too long, it could be wagging (and so poor accuracy).
maybe it's not a good design and it'll never work but someone could have a better idea... who knows ?
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Re: pantograph 3d printer November 22, 2018 11:34PM |
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Re: pantograph 3d printer November 26, 2018 11:41AM |
yes , it's true.
it's not easy to print near to the center of rotation.
if you move in the Y-direction, you have to move the turntable mecanism too or the pantograph.
but look a this (it's only hypothetical):
but the main idea is the pantograph.
one point is to built a direct drive (instead of the bowden system) but without an overload
the filament drive motor is not at the end of the cantilever but centered on the main axis
another point is to use a dual-shaft motor to drive each side of the pantograph up and down
Edited 2 time(s). Last edit at 11/26/2018 12:21PM by herve robert.
it's not easy to print near to the center of rotation.
if you move in the Y-direction, you have to move the turntable mecanism too or the pantograph.
but look a this (it's only hypothetical):
but the main idea is the pantograph.
one point is to built a direct drive (instead of the bowden system) but without an overload
the filament drive motor is not at the end of the cantilever but centered on the main axis
another point is to use a dual-shaft motor to drive each side of the pantograph up and down
Edited 2 time(s). Last edit at 11/26/2018 12:21PM by herve robert.
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Re: pantograph 3d printer December 01, 2018 12:19PM |
sketch with openSCAD
Edited 2 time(s). Last edit at 12/01/2018 03:33PM by herve robert.
Edited 2 time(s). Last edit at 12/01/2018 03:33PM by herve robert.
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Re: pantograph 3d printer December 02, 2018 01:39PM |
maybe CV-joint could be a very good design to cancel the angle.
not very easy to drive the filament in the heater
and today I made this
sample of gears to drive the turntable.
the motor as a counterweight is a good idea too
Edited 2 time(s). Last edit at 12/02/2018 01:44PM by herve robert.
not very easy to drive the filament in the heater
and today I made this
sample of gears to drive the turntable.
the motor as a counterweight is a good idea too
Edited 2 time(s). Last edit at 12/02/2018 01:44PM by herve robert.
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Re: pantograph 3d printer December 04, 2018 01:36PM |
The Z movement is an arc.
? Slicer post processing to correct ?
Wally 3D printer used a parallel arm to move table
[reprap.org]
[archive.fabacademy.org]
Wally really never worked
I have one sitting on a shelf gathering dust!
? Slicer post processing to correct ?
Wally 3D printer used a parallel arm to move table
[reprap.org]
[archive.fabacademy.org]
Wally really never worked
I have one sitting on a shelf gathering dust!
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Re: pantograph 3d printer December 05, 2018 01:30PM |
thanks.
I didn't know the wally printer concept
as far as I understand, it seems that the bed elevation is not balanced ...
yes, probably need some code tweaks to had the right print head movements.
about the use of belt.. maybe... strings or ribbon... with weight for backward movements of θ, t .
not quite totaly sure...
I didn't know the wally printer concept
as far as I understand, it seems that the bed elevation is not balanced ...
yes, probably need some code tweaks to had the right print head movements.
about the use of belt.. maybe... strings or ribbon... with weight for backward movements of θ, t .
not quite totaly sure...
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Re: pantograph 3d printer December 07, 2018 05:45PM |
On wally a movable pulley on bed was no problem to lift bed
When motor turned OFF -- stage fell to bottom --- really need stepper with brake
Correcting arc to linear NOT trivial in slicer code or post processor
Here is python code by Nick Seward (inventor of wally) to correct arc in Z motion
wallysegmentize.py
Good Luck
When motor turned OFF -- stage fell to bottom --- really need stepper with brake
Correcting arc to linear NOT trivial in slicer code or post processor
Here is python code by Nick Seward (inventor of wally) to correct arc in Z motion
wallysegmentize.py
Good Luck
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Re: pantograph 3d printer December 08, 2018 11:02AM |
Quote
cozmicray
On wally a movable pulley on bed was no problem to lift bed
When motor turned OFF -- stage fell to bottom --- really need stepper with brake
Correcting arc to linear NOT trivial in slicer code or post processor
Here is python code by Nick Seward (inventor of wally) to correct arc in Z motion
[attachment 108504 wallysegmentize.py]
Good Luck
Is the Wally failure due to bad luck ?
"A comical prototype doesn't mean a dumb idea is possible" (Thunderf00t)
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Re: pantograph 3d printer December 22, 2018 04:44AM |
I have try this with an elastic:
work not so bad.. see video too. video
Edited 2 time(s). Last edit at 12/22/2018 04:45AM by herve robert.
work not so bad.. see video too. video
Edited 2 time(s). Last edit at 12/22/2018 04:45AM by herve robert.
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Re: pantograph 3d printer December 26, 2018 05:39AM |
interesting
you've 10 teethes gear and a 100 teethes gear ==> 10 ratio.
with tape I hope an higher ratio ==> 16 or 20 or higher..
and maybe for the z axis, this design:
Edited 1 time(s). Last edit at 12/26/2018 05:47AM by herve robert.
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Re: pantograph 3d printer December 29, 2018 01:48PM |
Wally development
Some designs were proposed to make Z Axis linear.
Don't know if anybody implemented them?
Inventor went on to better designs!
Some designs were proposed to make Z Axis linear.
Don't know if anybody implemented them?
Inventor went on to better designs!
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Re: pantograph 3d printer May 27, 2019 01:38AM |
the purpose of this topic is to experiment something different.
for the angular movement, we could use a ball bearing like in a record player... like this:
but you see the majority of the weight is on the ball and the circular shaft surface must be precisely fit with the well.
but we can do in another way..
if we use magnets, we can do this
it's a ball bearing too but the shaft is balanced with magnetic forces (not mecanic)
(this is the same kind of thing in rotary movement used for this tonearm describe here:
https://reprap.org/forum/read.php?166,854080
)
here is a functional model:
the scad and stl files:
https://www.dropbox.com/s/nt7yjlvgph8g0gu/bearingUD.tar.gz?dl=0
video:
https://www.dropbox.com/s/9tlps6j05ontl5g/bearing.mp4?dl=0
Edited 1 time(s). Last edit at 05/27/2019 01:55AM by herve robert.
for the angular movement, we could use a ball bearing like in a record player... like this:
but you see the majority of the weight is on the ball and the circular shaft surface must be precisely fit with the well.
but we can do in another way..
if we use magnets, we can do this
it's a ball bearing too but the shaft is balanced with magnetic forces (not mecanic)
(this is the same kind of thing in rotary movement used for this tonearm describe here:
https://reprap.org/forum/read.php?166,854080
)
here is a functional model:
the scad and stl files:
https://www.dropbox.com/s/nt7yjlvgph8g0gu/bearingUD.tar.gz?dl=0
video:
https://www.dropbox.com/s/9tlps6j05ontl5g/bearing.mp4?dl=0
Edited 1 time(s). Last edit at 05/27/2019 01:55AM by herve robert.
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