Show all posts by user
http://reprap.org/wiki/RUG/Pennsylvania
Re: IBM Nanofabrication - 14 years ago
Here's a link to IBM's site on this topic: And here's an article with yet more details on this technology: enjoy!by maitri982 - General
IBM Nanofabrication - 14 years ago
This is nanoscale CNC type technology...very cool. It will be interesting to see where it leads:by maitri982 - General
Additive manufacturing about to shake up portable electronics - 14 years ago
Not intimate with the details, but this appears to be an exciting advancement in 3D printing....by maitri982 - General
Re: Linear Motion Precision - 14 years ago
> So, do you guys want a "Polymer Working Group"? > If I get 3-4 yes votes, I'll start one. YES!by maitri982 - General
Re: Linear Motion Precision - 14 years ago
thanks for pointing me to spota's work. The only issue is that his curing time was 10 minutes! If we have to wait 10 minutes for each layer of printing then its a non-starter. Objet and others print and cure in a very quick succession. Now perhaps they have the secret sauce photopolymer and that is the cornerstone of their biz, but maybe there is some quick curing polymer available on the genby maitri982 - General
Re: Belt Versus Screw Drive - 14 years ago
> > Having looked at contraptor in detail can you > explain what benefits it has over something like > 8020 (8020.net)? I really didn't get it once I > started playing with 8020. Thats easy "cost". Plus the whole self replication idea is more possible with angled aluminum if you have a multi-tool machine that takes the aluminum and can cut and drill it...although this would noby maitri982 - General
Re: Linear Motion Precision - 14 years ago
I am confused. Why are you you using 8020 linear motion pads if you are using rack and pinion? I would have assumed this was a replacement for 8020's linear motion solution. I also assume you are not getting your linear motion stuff from 8020...did you find a good supplier? anyway...it sounds like you have made some good progress. it will be interesting to hear what your final t-slot and racby maitri982 - General
Re: Linear Motion Precision - 14 years ago
goinreverse, have you been able to get that level of accuracy with t-slot linear motion? what steppers and electronics are you going with?by maitri982 - General
Re: Linear Motion Precision - 14 years ago
thanks all...it seems the consensus is .1 mm or better. I will use this as a guideline for frame\linear motion\electronics and motors design\choices... Kevinby maitri982 - General
Linear Motion Precision - 14 years ago
Question: what is the minimum degree of control (in metric) that is needed in the X\Y plane to get decent resolution on FDM prints? What would be optimal degree of control which is the maximum degree of control where beyond which improvements in control would not make a difference given current extrusion methods? I assume someone has had to determine these numbers...at least I hope so... Keviby maitri982 - General
Re: Belt Versus Screw Drive - 14 years ago
good stuff guys..."thanks". Has anyone done a rack and pinion with RepRap style printer here? It would be good to compare that versus belts\screws from an accuracy\speed perspective as well before i make a final decision... Kevinby maitri982 - General
Re: Belt Versus Screw Drive - 14 years ago
I am interested in what provides the best combination of accuracy + speed. Given all the experimentation here I would think there should be some really good experience in this area...by maitri982 - General
Belt Versus Screw Drive - 14 years ago
I am trying to fully understand the trade offs between these two approaches. There are so many linear motion assemblies that it gets hard when designing from scratch to determine the best one to go with. At a high level, there are belt driven assemblies and screw driven assemblies. In some cases the belts drive screws as well. If anyone cares to share there experience it would be useful for mby maitri982 - General
Re: RepRap 3.0 - 14 years ago
MarcusWolschon Wrote: ------------------------------------------------------- > maitri982 Wrote: > -------------------------------------------------- > ----- > > Laser sintering sounds like it would be a major > > advancement on todays extruder FDM approach...I > > hope they take up your reasoned suggestions, > they > > all make sense to me as an outsider lookiby maitri982 - General
Re: Linear Motion Solution - 14 years ago
thanks goinreverse, As I said, those comments were old and did relate to CNC. what size t-slot are you using? I downloaded their program to estimate warping based on loads at different points across a span. It was interesting to play with some numbers and see what kind of warping you will see. I look forward to your design, although I personally favor the X/Y movement to all be done at theby maitri982 - General
Linear Motion Solution - 14 years ago
Since linear motion is so key to these systems, it important to explore all solutions assuming you aren't tied to printed parts. This provider has some really good looking stuff: I read that t-slots were not great for linear motion with their bearings as there was too much play in them, but that material I read was from 2005, so maybe they have improved in that area. kevinby maitri982 - General
Re: Just add stepper motors ... - 14 years ago
that price is phenomenal. By the looks of the threaded rod he is using you will need some heavy duty steppers to turn them...by maitri982 - General
Re: Contraptor - 14 years ago
I like eiffel...would be nice to see eiffel made with t-slot with linear motion handled by rack and pinion perhaps...by maitri982 - General
Re: Contraptor - 14 years ago
I see it only has 2" in the z-axis though...which is rather limiting for FDM. Maybe they will offer different scaled versions in the future.by maitri982 - General
Re: rack and pinion versus belt? - 14 years ago
I already had a go at that page. I added the verbiage around the t-slot RepRap version...by maitri982 - General
Re: rack and pinion versus belt? - 14 years ago
all i can say sitting back and watching this dialog is that if certain people here are representative of the core RepRap team than many people will not want much to do with it. There should be a certain sense of decorum between people on such projects. My experience is that friction of ideas fosters the creative process, but only amongst mature individuals. if it degrades to insults or callingby maitri982 - General
Contraptor - 14 years ago
Perhaps this is something that could have an extruder strapped to it for FDM: $300 gets you a multi-tool capable apparatus... Kevinby maitri982 - General
T-Slot Replicator - 14 years ago
A wiki section has been added to this site for this project. I hope those working in this area will edit that section with their own additions so we can see progress and design ideas. It can be found here:by maitri982 - Extruded Aluminum Frames
Re: RepRap 3.0 - 14 years ago
Sebastion Et Al, I think a separate section of the wiki is a great idea. I am enthused about some of the directions things are taking. I had thought of an 80/20 prepacked as well, but perhaps now I don't have to worry about it thanks to goinreverse. The nice thing is there will still be room for people to innovate within whatever design we start with using extruded T's. As I previously stateby maitri982 - General
Re: Dumb Electronics Question - 14 years ago
Most people already have a computer...so cost=$0. Plus there is time to consider. Putting that Arduino board on there and flashing ROM etc is not going to appeal to the masses...and it is just uglyby maitri982 - General
Re: Dumb Electronics Question - 14 years ago
thanks for the feedback... I was only throwing out phidgets as one example. i think it would make this whole project much more attractive if there was less electronics involved. One board for steppers and one board for sensors woudl be great. Cheap netbooks can be bought for under $200...so it is getting hard to justify a dedicated board that needs wired up for this project. I am no compelleby maitri982 - General
Re: Stepper Motors?? - 14 years ago
Is this too much motor for a Darwin type device that might also have a CNC as a tool? Phidgets looks to have a good selection of motors...but i do not know pricing from other places so I cannot say whether they compare favorably.by maitri982 - General
Dumb Electronics Question - 14 years ago
After reviewing everything here, it is not clear to me why a motherboard of any type is needed for 3D printing. As I understand it, there are these items to control\manage: * 3-axis stepper motors and one extruder stepper motor * Various end stops sensors * Temperature Sensing * Extruder heater For motor control a simple board like this can be used: and the temp and end stops with this:by maitri982 - General
Re: gen 4/5 electronics - 14 years ago
Not sure if anyone has checked out beagleboard... Cost is $150...so maybe too high, but very capable board.by maitri982 - Next Wave Electronics Working Group