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So now I have the pirated cupcake (has ramps electronics) and the prusa-ish mendel running smoother than ever and producing beautiful, smooth parts with Marlin. I set the max acceleration for x and y at 900.
Of course, I am tempted to increase the speeds for printing, that is the
next question. Currently I am using in skeinforge 44 mm/s for the mendel and 40 mm/s for the cupcake, with perimeters
by
Lanthan
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General
Austria Microsystem has a very interesting linear magnetic encoder, works with a relatively inexpensive strip. Makerbot released an open source board a couple of years ago.
The chip can give either quadrature encoder or absolute positioning information. Unfortunately, there hasn't been much development (actually, none at all) around this idea. Interested?
by
Lanthan
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Developers
@garyhodgson: thank you for the links! Yes I was thinking of Finite element analysis. Still it is a nontrivial engineering topic, and we'd need to know well the mechanical characteritics of printed material.
Course notes on FEA (book), fascinating reading
A paper on FEA and SDM at Stanford: spiral patterns seem interesting (but the topic is fused metal powders)
A paper by Stratasys - not A
by
Lanthan
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General
There's a long and contorted story to that "buy locally" state of mind when applied to industrial goods (food staples behave differently)
Certainly, for the steppers and any permanent magnet devices, China has local access to rare earth minerals, and the workforce...
On the other hand, outside of the main "technological cluster" regions, many specialized devices are sort of hard to source "loca
by
Lanthan
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General
Do you know of any FOSS materials stress analysis software? (plus accessible introductory tutorials)?
In default, common sense plus observation can help a lot.
by
Lanthan
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General
AFAIK water is quite an efficient UV filter by itself (depending on the wavelength - check absorption spectrum at the wavelength you are using - see here for example ). I have no experience in the process you describe, but Id make sure that if water is absolutely needed in the trays, its depth is just the minimum necessary.
by
Lanthan
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Polymer Working Group
I like Qcad, works on Linux, Mac and that other platform. Quite mature soft.
there's an open source version and a "pro" one (main difference: a command line, just like Autocad), quite inexpensive (about 30 Euros). File format is dxf. Strictly 2D, but who needs 3D drafting at all?
by
Lanthan
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3D Design tools
Further thoughts:
For PCB milling, one should aim to input the minimal energy necessary to do the job --> less wear and vibrations.
Incomplete limerick of the day:
There was a guy on the Internet
Selling small spindles by the ticket,
His name was wolfgang engineering,
...
Those were reputed to be extremely precise, and used a rather small DC motor coupled to the spindle with two belts - ac
by
Lanthan
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Developers
People tend to start with 3mm filament, 5 mm nozzles, 0.4 mm layer height.
advantages:
-A bigger size means more tolerance of hardware shortcomings (like a not perfectly flat bed, no glass) and mis-manipulation.
- You can get a finer resolution look (0.2 mm) with a trick on skeinforge and other slicers that halves the layer height just for the perimeter.
- As of lately experienced people are p
by
Lanthan
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Plastic Extruder Working Group
@miro87043, jmir and all: A big THANK YOU, I have it running and printing with your instructions!
First looks: at equal speeds, Marlin is much softer on the mechanics, the machine runs quieter, vibrations reduced. Maybe also less risk of bolts unscrewing, parts loosening etc.
Printing quality is substantially improved, cleaner.
Adopted!
A note of cauton: the Z homing speed MUST be reduced to
by
Lanthan
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General
I recently gave a first try at Marlin. Prusa Mendel with RAMPS 1.25 and Arduino Mega 2560, heated bed, GregFrost's extruder, ParCan - supplied thermistors on both the bed and the extruder, current Sprinter configured and printing well: quite standard. Also copied settings one by one from Sprinter to Marlin configuration.h
Marlin 1.0 just starts and quickly refuses to run and halts everything beca
by
Lanthan
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General
Hi folks,
Happy new year to you all,
Have a search at "cnc 3020" on ebay, with international scope enabled and sorted by price plus shipping cost, lowest first.
Many shops are HK resellers, they might be ok as long as they are reasonably specialized in machine tools.
have a look for example at this one:
the spindle made from the refurbished electrocraft 240 dc motor is very visible in the pi
by
Lanthan
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Developers
Traumflug Wrote:
-------------------------------------------------------
> Track width minimum 30 mil for toner transfer
> etching and minimum distance between copper 16 mil
> (0.4 mm). Pin diameter either 60 mil with 30 mil
> drill (0.75 mm for resistors, caps, ATmega pins)
> or 80 mil with 40 mil drill (1.0 mm for jumper,
> connectors, etc.). So no, with current milling
> t
by
Lanthan
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Developers
Time to try Marlin (ramps 1.25, thermistors on bed and extruder) , just a couple of compilation reports:
- commenting out #define SDSUPPORT results in the following failure:
In file included from Sd2Card.h:27:0,
from SdVolume.h:27,
from SdBaseFile.h:28,
from SdBaseFile.cpp:22:
Sd2PinMap.h:43:15: error: expected unqualified-id before numeric
by
Lanthan
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Firmware - experimental, borrowed, and future
@Brianandaimee: I see definite advantages in being able to drive up to 3 Amp per phase. This would open the way for using, for example, stronger nema23s on the heavier axes (for aluminium plate + heater + glass + structural support + bearings + at least 10 mm wide belts tend to add up in inertia).
Many commercial CNC designs use independent boards, one per axis. This is great for modularity.
Hav
by
Lanthan
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Developers
Spaces... I had thought of that, tried without spaces and with spaces, same error.
Resorting to manual revision of the files. Bah, just a minor hindrance.
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Lanthan
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Skeinforge
I've narrowed the possible culprits to the Alteration module. If I disable Alteration, no error happens.
Could it be that I inadvertently put some offending code in start.gcode and/or end.gcode?
start.gcode:
G21; metric is good
G90; absolute positioning
G92X0Y0Z0E0; zero the extruded length axes
end.gcode:
G91 ;
G1Z10F100; lifts nozzle 10mm from finished print surface
G90 ;
M104S15; turns of
by
Lanthan
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Skeinforge
Using SF 45 on Ubuntu 11.10, Python 2.7.2+
On skinning, SF export module barfs with the following message:
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1413, in __call__
return self.func(*args)
File "45_reprap_python_beanshell/fabmetheus_utilities/settings.py", line 1144, in execute
self.repository.execute()
Fi
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Lanthan
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Skeinforge
Yep. But the Stepstick has thinner tracks in the motor outputs.
Probably doesn't matter, anyway. (?)
by
Lanthan
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General
Hi!
Way to go!
extruder: you can cnc-route it. this one works well for me. You certainly improve it
system: hope you have planned for a 4 axis controller
otherwise you can mill / build one, easy enough.
have a look at emcrepstrap
there are several versions of code around. You just send the extruder codes to an A axis - or configure skeinforge to generate A instead of E.
(haven't doe th
by
Lanthan
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General
Any hints on the pricing per meter of those torqsline screws? international availability?
by
Lanthan
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Developers
I had this problem (non-mendel build), it appeared after adding weight (AL plate) to the carriage, turned out to be lost steps in the X motor. Slightly increased the driver's current and added a fan pointed to the culprit stepper (this one: , I prefer the 1684 , problem solved.
by
Lanthan
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General Mendel Topics
I guess you are talking about Aluminium and not human parts
You want both of those sheets to be rigid and a carriage as light as possible. Not sure AL is the best choice - maybe if it is hollowed out to decrease weight?
Check out also if some "open carriage" designs might be adapted to use bushings/linear bearings.
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Lanthan
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General
I have asked around, in another thread, for ideas about what we should measure, that could set the basis for a suite of tests, but no answers yet.
So here it is again: we need input on which features we should test, that are good proxy indicators/predictors for quality bulds.
Anyone there?
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Lanthan
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General
The outlines of these dxfs follow the recommended sizes in the BOM. The magnets stuff is optional
by
Lanthan
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General
In the absence of a standard set of benchmarks and common agreement about criteria, difficult to judge...
by
Lanthan
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General
overheating of the drivers?
have you got a fan cooling your sanguino-polololus?
by
Lanthan
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General
attrezzopox Wrote:
-------------------------------------------------------
> Let's be honest that wall of text wasn't meant to
> do anything but discourage me.
>
ok let's make it short. ;-)
> Just like an EE could say (and
> many DO say) that the arduino skips important
> steps and "prevents" newbies from learning, you
> could say that writing a simple program that turns
by
Lanthan
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Controllers
Some years ago I tried polyester resin big scale (boat hull) in a well aerated place.
There's one thing I definitely do not like aboit it: the fumes, a bunch of quite nasty volatile components there.
Epoxy, while more expensive, is less obnoxious - excepted during the curing phase-
As for reprap molded parts, you might want to check out clonedel.
by
Lanthan
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General