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  • drahfa 3:58 am on October 16, 2014 Permalink | Reply
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    How to build a prototype? And what 3D printer to use for an entry level designer? 

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    Building a prototype is one of the activities that being practiced by physical form designers. The process of building a prototype involve serious commitment of time, whether it is a simple product (phone casing) or a full-fledge quadcopter.

    Depending on the purpose of the prototype, a designer can choose from several methods available. There exists some prototype such as ‘visual prototype’, ‘form study prototype’ or ‘proof of concept prototype’.

    When focusing on designing physical objects, the most versatile method to come to the realization of the prototypes above is the 3D printing technology. One might argue that for visual and form study prototype, a low cost clay can be used. However since the visual and form study prototype are mostly can be done via computer-aided-design software. Through the use of 3D printing technology, one can instantly proof the concept of a new design could work via its physical movements and validating its use instantly.

    Recommended 3D Printers.

    I’d say from my experience, I would recommend Flashforge line of products. The one that I’m currently using is the FlashForge Creator. It’s inexpensive, sturdy and for this one and a half year I have been using them everyday to build my working quadrotor/tricopter vehicle without fail.

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  • drahfa 1:08 pm on July 10, 2014 Permalink | Reply
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    Sesi Drone Briefing Bersama Unit Korporat (CITRA) UMT 

    Unit Korporat UMT sedang menimbangkan untuk membeli beberapa buah quadrotor drone. Oleh yang demikian, saya dengan berbesar hati meluangkan masa bersama dengan orang-orang kuat dari Unit Korporat iaitu En. Mokhtar (photographer), En. Amirul & En. Hadi untuk memberi penerangan ringkas sebelum pembelian dijalankan. Sesi turut dihadiri oleh ahli kumpulan penyelidikan saya, En Israr & Cik Hafidah.
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  • drahfa 8:19 am on December 30, 2013 Permalink | Reply  

    Propeller tersepit kat quadcopter arm 

    Rupa-rupanya ada sebab kenapa sambungan arm dan centerbase bagi frame DJI agak tenggelam. Rupa-rupanya untuk mengelakkan propeller tersangkut di bahagian sambungan apabila berlaku minor crash.

    20131230-161901.jpg

    Note to self: untuk rekabentuk arm yang baru, buat sedikit ‘mortice & tenon‘ connection supaya sambungan menjadi rata.

     
  • drahfa 2:41 am on December 21, 2013 Permalink | Reply
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    3D printing stuff: I built a working drone in 24 hours 

    Last week I manage to get some time off from markings, teaching classes and meetings. As a designer, I found that the more stressed I am, the more drive I got to build things.

    So armed with a caliper and an old ProEngineer CAD software, I manage to design from scratch a simple quadcopter frame. It is basically consist of a centerbase (I printed it twice), and an arm (I printed it 4 times).

    You can download the the STL files here:

    Scidrones 3D Printed Quad

    2013-12-16 12.17.11
    Pic above: the built drone, fresh from the 3D printer

    The motivation comes from my DJI F330 frame that broke due to a crash last few months ago as shown below. So I was thinking, well this is a good reason to custom-design my own simple frame. If it crash and broken, I’ll just print it again. So it makes the downtime shorter.

    2013-12-10 16.50.45
    Pic above: My broken quad

    So once my frame were printed, which took about 6 hours to complete (ABS material, 50% infill, on a FlashForge Replicator printer), I installed the control board (APM 2.5), the 20 amp electronic speed control (ESC), a 2200mah battery, four Gemfan 8×4.5 SF prop and four brushlesh motor (Prodrive 1200kV) on the frame.

    It took me another half an hour to upload the PIDs, checking the balance, trimming the cable-ties and whatnot before I test-fly it in my office.

    And it fly great! No wobblings, very light and fairly strong!

    Some flyers concern about the motors being hot due to enclosure, but this is a tough decision that I have to make. In my defense,
    1. I’ve tested the hover to the maximum battery-time capacity of 7 minutes and the motors only heated up to 63 celcius and the 7-minute ride is more than enough to cover UMT’s shoreline at the altitude of 600 metres.
    2. The battery and esc’s are cool and happy!

    Now the to-do’s!
    1. Design and build a simple camera-gimbal to stabilize my GoPro camera.
    2. Design and build a water- and sand-resistant enclosure for the motor and electronics.

    Next up, if I’m not in the office, I’m probably at the UMT coastal line to run aerial coastal monitoring. See you there!

     
    • hudy 7:34 pm on April 30, 2014 Permalink | Reply

      nice! … u make available the file. STL to download?

      • Dr. Ahmad Faisal Mohamad Ayob 6:46 am on May 5, 2014 Permalink | Reply

        Hi! Pardon I forgot! Here’s the download link. The post has been updated with the link as well.

  • drahfa 7:50 am on October 30, 2013 Permalink | Reply
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    I’ve printed a toothpaste tube roller! 

    It’s been a while since I’ve made an update in this blog. However there are lot’s of teaching, reading and discussions that need to be attended lately in my faculty, since we are moving forward to the school system. Later, my department shall be absorbed to the new structure which is named School of Ocean Engineering. So my research team here are aligning our strategy to fit in so we can contribute to the new system.

    Nevertheless, no worries. Yesterday I manage to get a free time off from the subjects and whatnot, to print a toothpaste tube roller!

    The .stl files can be found here: http://www.thingiverse.com/thing:169119

    Thank you Thingiverse user: Jazman for providing us the file.

    So here comes nothing πŸ™‚

    2013-10-30 10.12.53

     
  • drahfa 4:22 am on July 25, 2013 Permalink | Reply
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    3D printed an F450 top frame 

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  • drahfa 4:01 am on July 19, 2013 Permalink | Reply
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    Design and 3D Print of Eppendorf Test Tube Rack 

    Last 2 weeks ago I manage to spend some time designing an Eppendorf test tube rack. This particular rack are common in medical sciences lab, in which my wife is working in. Well, I personally never seen the rack, but my engineering sense told me just take the test tube work my way up, this is called bottom up approach in design.

    20130719-115649.jpg

    In her lab, the test tube rack is somewhat an asset, therefore everybody needs to sign in and wait for turns to use it. I recognize this as a problem, therefore I took an initiative to design and manufacture a tube test rack for her. I began with measuring the test tube using micrometer as shown below.

    20130719-120012.jpg

    My wife requested that the test tube rack should be able to store 4 x 5 test tube. So using the measured value, I pop my favourite CAD software (ProE) and began designing the rack. I took Mac Mini design as an inspiration. See figure below.

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    Next, the model were saved as .stl and sent to MakerWare as shown below. The .stl file were later processed as g-code and saved in an SD card.

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    Quick! Head to the bat-3D printer, Robin!

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    The final form is shown below, victory!

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  • drahfa 2:45 pm on July 7, 2013 Permalink | Reply
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    I bought a Flashforge Creator 3D Printer 

    I ordered a Flashforge Creator 3D printer on 30th Jun 2013 from AliExpress. The item was safely arrived from mainland China by FedEX on the 4th July. Pretty quick, and I’m very happy to report that the machine is doing very well!

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    As usual, I started off by calibrating the build platform. The Creator model was derived from Makerbot Replicator, therefore the LCD interface shows the similar guide on leveling the platform step by step.

    Once done, I printed the calibration box that came together inside of the SD Card. The current model has a heated bed platform, therefore it is a good idea to print the model with raft support to ensure that the printed item stick on the platform well.

    20130707-224059.jpg

    Flashforge Creator is much better than the Mbot3D printer. Creator operates much quiter, the filament guide is more well thought for and it comes with heated bed platform. The price is much cheaper than the Mbot3D as well, that might be depending on which model that you are getting. My Mbot3D is a dual extruder model (which I got wrong on more extruder is better, you’ll be happy with one, trust me) that cost me $1k++ with shipping, and the Creator is a single extruder with heated bed platform that cost me $800++ with shipping.

    As for me, I think that I’m going to stick with Flashforge Creator 3D printer for a while. However I’m still having fun with the no-heat bed platform on my Mbot3D. So the journey continues…

     
    • jim 9:24 am on August 6, 2013 Permalink | Reply

      I bought flashforge 3d from thebgastation.com and I am happy with this purchase!!!!!!!!!!! I received in 8 days . I love the fact that Dual extruder is much larger than I could thought of.

      the software seem very easy to use!

  • drahfa 11:15 am on July 1, 2013 Permalink | Reply
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    Mengapa 3D designer memerlukan 3D printer 

    Seseorang designer memerlukan 3D printer untuk melihat bagaimana prototype yang telah direka berfungsi dan dipersembahkan, sama seperti seorang penulis memerlukan printer untuk menyebarkan penulisan mereka.

    Mungkin ada yg akan argue, mengapa menggunakan 3D printer, walhal injection molding telah ada? Pada fikiran saya, situasi ini sama seperti ‘mengapa menggunakan desktop printer kalau di tempat kita ada syarikat percetakan?’.

    Rasionalnya adalah, syarikat percetakan mencetak untuk skala besar, sama seperti injection molding, yang mana hasilnya memberikan kos yang rendah. Manakala desktop printer digunakan untuk mencetak satu atau dua salinan teks, sama seperti 3D printer, kosnya lebih rendah dan efektif untuk semakan.

    Sekiranya sesebuah research group itu terlibat dengan prototype design, saya rasa 3D printer adalah sebuah indispensable tool. Bayangkan dari fasa idea, lukisan CAD 3D dan akhirnya functional prototype di dalam masa 4 jam di atas meja di pejabat.

    Saya sedang merekabentuk self-stabilizing camera holder (gimbal) untuk quadrotor saya. Nanti kalau ada gambar baru, saya akan upload lagi. Till then, see you in the next update : )

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  • drahfa 12:20 pm on June 27, 2013 Permalink | Reply  

    Penyelesaian kepada botol Medela with Suction Cup yang tak stabil. 

    Medela adalah salah satu daripada pengeluar pam susu yang berkualiti tinggi. Bagi satu pakej standard, Medela membekalkan botol, pam susu dan suction set. Walaupun ia tergolong di dalam pakej premium bagi para ibu, saya diberitahu oleh isteri saya bahawa botol yang dipasang suction set biasanya tidak stabil. Medela ada bottle holder, tapi ia tak termasuk di dalam set yang biasanya dipasarkan. Selalunya kalau baru siap pump, susu akan tumpah walau tersentuh sedikit suction cup tu. Menangislah para ibu time tu.

    Me_11768143._medela-swing-maxi-double-breast-pump

    Walaupun Medela ada bottle holder mereka, ia tak mudah didapati melalui pembelian online atau di kedai-kedai. Mungkin mereka tak perasan bahawa masalah susu tumpah ini adalah masalah yang real. Oleh yang demikian, sebagai seorang designer, saya perlu mengambil langkah pro-aktif untuk menyelesaikan masalah ini. Lagipun 3D printer saya masih lagi di dalam calibration stage.

    2013-06-28 09.26.00

    Mula-mula, saya menggunakan ProE (CAD software) untuk merekabentuk bottle holder. Saya buat ukuran diameter standard Medela bottle dan menjarakkan sedikit supaya suction set ada sedikit clearance.

    Kemudian, model tersebut di save di dalam format .STL supaya boleh dibaca oleh ReplicatorG. ReplicatorG diperlukan untuk produce G-Code yang boleh difahami oleh 3D printer saya. Setelah siap, G-Code tersebut dihantar ke 3D printer untuk menjalani proses printing. Oh, saya letak engrave nama di atas produk ini untuk melihat sama ada 3D printer saya boleh mencetak nama di atas produk yang dihasilkan.

    Keseluruhan proses design mengambil masa selama kurang dari 10 minit (saya memang dah biasa dengan ProE sejak 2004). Manakalau proses printing pula mengambil masa selama 4 jam. Saya menggunakan infill sebanyak 5% kerana model ini tak bergerak dan tak perlu terlalu lasak. Feedrate yang digunakan adalah 30mm/s, dengan suhu 230 C bagi menghasilkan lekatan plastik ABS yang stabil.

    Hasilnya, sebuah platform bottle holder telah berjaya disiapkan. Saya dan isteri membuat beberapa cubaan menyiku suction cup untuk melihat sama ada botol ini mudah tumbang. Nampak gayanya platform ini sangat stabil bagi penggunaan biasa, yang mana ibu-ibu tertumpah susu sebab tersentuh suction cup tersebut.

     
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