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BodgeIt Wrote:
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> I personally would like to see a 4mm thick
> Aluminum plate for the bed as a start to making it
> low profile.
>
> Now heating the bed that is a little thinner by
> will take less power we can re- use Nopheads
> calculations so we are not re-inventing the wheel
> any more.
Yes, a thinner plate is d
by
casainho
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General
Introdution
A heated build platform helps greatly to avoid the warp problems and permits the print without using raft!
RepRap wiki page: Heated bed.
Some examples of my printings (heated build platform @ 110ÂșC, printing over kapton tape):
Some people already uses them but there is no documentation and they looks like experimental. I would like to start a discussion, so after we can use the b
by
casainho
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General
> blogging/uploading/sharing/commenting/
People are doing this already in a great way! using BlogSpot which is great and simple for people to use.
We are all connected, thanks to "RepRap aggregation pipe of blogs" -- which were a great idea :-)
Everyone can create his own blog and we can comment on every blog, using the same ID, OpenID for example.
On my blog I have a widget that shows lat
by
casainho
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Administration, Announcements, Policy
If anyone want to use CNC for making a RepStrap, go here:
EMCRepStap:
by
casainho
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EMC2
I bough the stepper motor controller from Pololu:
And I also bought the NEMA 17, part number SY42STH47-1684B from Zapp Automation.
Thanks ;-)
by
casainho
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Mechanics
Triffid_Hunter Wrote:
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> casainho, I just ordered some A4983 carriers from
> pololu, instead of reprap stepper boards. my
> steppers are also 2.77v, 0.44Nm ones so current
> chopping is critical, and the 16x microstepping
> may not be much help for the axes but will be
> excellent for the extruder.
Thanks ;-) I already boug
by
casainho
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Mechanics
So I would not use a stepper motor of 2.77V with A3949! Even if using PWM...
So, what is the better board for using with a stepper motor that have lower voltage than 12V, like say that of 2.77V? Is there any board that controls current?
I decided to make a blog to document my findings...
by
casainho
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Mechanics
Triffid_Hunter Wrote:
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> I can't turn my steppers if I merely short the
> leads and at 250mA they feel fairly strong.. maybe
> you need a low voltage one? Mine are rated 0.44Nm,
> 1.68 ohm, 2.77v, 1.68A
>
> Remember, you need more voltage when the stepper
> is moving to maintain the current into the winding
> inductan
by
casainho
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Mechanics
nophead Wrote:
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> Torque is proportional to current, not power.
> Heating is proportional to power though.
Ok, thanks. So, doing the math again in a correct way (I hope):
U = 14V ==> Nema 17 torque = 0.26 N.m
------------------------------------------------------------------------------
My actual situation:
U = 12V
Pulley diameter
by
casainho
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Mechanics
nophead Wrote:
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> The NEMA17 that Adrian uses in his stepper
> extruder has more torque than the MakerBot NEMA17.
> It has 0.44Nm holding torque.
>
> The MakerBot motor is actually a 14v motor so you
> don't get 0.26Nm at 12V, more like 0.22Nm, so half
> that of the recommended motor.
I ordered from RepRapsources here i
by
casainho
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Mechanics
There is another thing on datasheet of Nema 17 from Makerbot store, the "detent torque", which is 0.012Nm, 21.7 times less the value of holding torque... shouldn't we take this "holding torque" value in consideration?
by
casainho
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Mechanics
In reply to
nophead Wrote:
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> The NEMA17 that Adrian uses in his stepper
> extruder has more torque than the MakerBot NEMA17.
> It has 0.44Nm holding torque.
Nophead, thanks for your help.
So, I shouldn't bought the Nema 17 motor from Makerbot store, for this application.
> The MakerBot motor is actually a 14v motor so you
by
casainho
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Mechanics
> I've gotten the extruder to work barely with the
> setup below which has a 3:1 ratio. It can barely
> run in this setup so there is no hope of it
> extruding a filament in a direct drive setup.
>
>
> _extruder.JPG
I think you can't get more torque just because you speed up the motor...
And I read somewhere that stepper motor lower the torque as you go higher in velocity
by
casainho
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Mechanics
swighton Wrote:
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> I have the one from the makerbot store that
> allegedly has .26 Nm holding torque. I have tried
> adjusting every possible thing that I can think
> of, here is what I have deduced
>
> -Adjusting the pot on the extruder controller
> board has zero effect on the output torque of the
> extruder stepper
by
casainho
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Mechanics
Thank you! ;-)
by
casainho
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General
Hello :-)
I would like to ask admins to edit the page:
And put there at least a link for the information on page:
BrendanErwin started to wrote the EmcRepStrap but is not more interested on it. I already started to build my own EMCRepStrap and want to document it, to help others and myself.
Thank you.
by
casainho
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General
Hello :-)
I also have a CNC and want to build an EMCRepStrap! I already bought the pieces for extruder, I will have to make some other parts...
I start gathering the information and files for EMCRepStrap and I am try to follow the sam0737 steps. SEE HERE:
Please let's get build this together and document it, so everyone win ;-)
I decided to buy my parts for plastic extruder from Makerbot sto
by
casainho
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CNC Routers, Mills, and Hybrid RepRapping
I bought recently a small CNC and I already bought the pieces in kit for making the extruder. I am using EMC2 on Linux for control my CNC.
There is a wiki page with information on how to do this --> EMCRepStrap.
by
casainho
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For Sale
Hello :-)
I am looking to buy the printed/reprapped parts for Thermoplast Extruder Version 2.0. This are just 2 (or 3) parts!
I already own a CNC machine, so I am trying to build a EMCRepStrap version of RepRap, that's why I just need the extruder + his controller.
Please help me to be able to build my RepRap. I promise that I will make the same, prints parts for others and sell on this forum.
by
casainho
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Wanted
sam0737!! Great to share your work!! I bought recently a cheap CNC machine and I want also to start printing ;-)
I will follow your steps and use your code. I also like the
brendanjerwin work, however since is from a 1 year ago I didn't know if is working.
I don't like the fact that there is no documentation on wiki pages of RepStrap for a EMCRepStrap :-(
EDIT:
Well, I went and created a wik
by
casainho
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CNC Routers, Mills, and Hybrid RepRapping
Hello everyone :-)
I bought recently a CNC machine for milling/drilling PCB. I would like also to start printing using an extruder.
I use Free Software and I like to hack. I am using EMC2 to control my CNC. I have some good knowledge on Arduino. Is there any page with a good tutorial and tools needed to use a CNC and EMC2 for printing?
Thank you.
Jorge Pinto from Portugal
by
casainho
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EMC2