Beiträge von Xiaohu Wang

    Wow this is very impressive of the housemade organ presented in the youtube link. I always wish to have a clavichord in the future, but to ship to where I am in China is a bit difficult, hope your instrument find a good buyer soon. And could I ask what is like to build a clavichord than an organ? Best, Xiaohu

    Some progress on making the first stop pipe, a c3 pipe for the 4 foot stop. I glue the three sides and the mouth piece, the rest of the cover board i didn't glue to give space for fine tuning. luckily it works when using my hand to block the back, I have not make the stopper yet. The wood I use is birch wood and I find it is quite soft and easy to work with. Looking forward to your comments and advice.

    Best, Xiaohu

    Hello my organ building friends,


    Much thank you to all your kindness support during the process of drawings, I asked a lot of questions and I really appreciate your generous help.

    After finishing the CAD drawings of the chest organ based on Mr. Koele's composition No.5, kistorgels.nl

    I'm finally starting to build it. I don't have a workshop for my own, therefore, most of the work I decided to allocate to a local wooden workshop or via the online store of taobao.com .

    I start with the channel of the windchest, send the cad drawing to an online laser cutting store, they only offer maximum 1cm thick of plywood. So I give it a try with an overall cost of 11 euros. Here is what it looks like, the overall width is 87cm.




    The width of individual channel spans from 13mm (lower notes) to 7mm, and channel spacing is also 7mm.

    One way to increase the height of the channel is to laser cut two board and glue them together? I wonder if it works, looking forward to hearing your comments. Thanks and regards!

    Xiaohu

    Hi Sam, thank you so much for your kind response.

    From my intuition, the air jet is very much related to the hole opening at the sound board and the pallet, I somehow can not understand why it is related to the height of the channel or the volume of the channel.


    "In the worst case of a flat wind chest, a chord in the right hand suddenly becomes deeper when the left hand plays a larger pipe that takes more wind."

    I think it might relate to the volume of the bellow, that a sunden outlet of wind results a drop in pressure.


    My reference of windchest building mainly comes from Koele's website, kistorgels.nl and nippocast youtube channel and part of the Boersma's book can be previewed online it is really quite helpful already.

    Thanks again for your helpful advice and comments. Xiaohu

    Hello Sam, could I ask what is the height of the channel? or the height of the windchest? I am planning to make them by laser cutting, but the thickest board for laser cutting is 10mm, I wonder whether it would be enough. Best regards, Xiaohu

    Hi Jens, is it possible to show how the magnets are installed?

    Meanwhile, I am start to building the organ now, starting with the pipes and the windchest, I will open a new post after finish something, best regards, and looking forward to see more of your progress. Xiaohu

    Dear fellow organ friends,


    It is been a bit busy recently, but some updates on the drawings of the chest organ, the placement of the organ pipes have been finished, but 8 pipes have been cut into L shape and the C#pipe is made into U shape. Next I will continue to draw the below and the blower. Looking forward to your valueable advices.


    Best,

    Xiaohu






    Hello Xiaohu, your keyboard is ending on note E. That's a bit strange because the "usual" compass is rather up to a2 (renaissance), c3 or d3 (baroque) or f3/g3 (later). If you prefer to play music after the baroque era, I would suggest to go up to at least f3 which is one note more as far as I can tell. Regards, Jens

    Hi Jens, I finally understood why Mr. Theo Koele's design of the keyboard is ended on the note E3. The span of the pipes actually ended in d3, a total of 51 pipes, thus the keyboard can transpose two semitones lower (440-415-392). I think that is the reason. And also thank you for answering the L shape pipe design. Best, Xiaohu

    Dear friends of organ builders,


    I have a question is how to prepare the L shaped closed pipe, where to make the cut? Is there any certain rules?

    The physics of the closed pipe resembles to one closed end pipe, as shown in the gragh below. So, Do I need to cut at the place of a 'node' of a harmonics, in such case to let the 'turning' of the wave not to be disturbed much?

    I think for closed pipe, the strongest sound is the fundamental tune and the 3rd harmonics, so to make the cut, do I need to just avoid the anti-node of the 3rd harmonics?


    Best regards,

    Xiaohu


    http://hyperphysics.phy-astr.g…base/Waves/clocol.html#c1

    Thanks so much for sharing Samuel! I wonder what is the height of this instrument? And what are the function of the five knobs below the keyboard?

    I know little about the harmonium although this is a more widely used instrument in China before the 1990's where the music class of the elementary schools in China used harmonium to teach music before it was replaced by the piano later.

    Just a quick search from the Wikipedia I found that the mechanism is actually from a triditional Chinese instrument, amazing!


    The pump organ is a type of free-reed organ that generates sound as air flows past a vibrating piece of thin metal in a frame. The piece of metal is called a reed. Specific types of pump organ include the reed organ, harmonium, and melodeon. The idea for the free reed was imported from China through Russia after 1750, and the first Western free-reed instrument was made in 1780 in Denmark.

    https://en.wikipedia.org/wiki/Pump_organ#Harmonium

    Thanks Jens! From the preview, this book is surely worth buying and it is like a LEGO Instructions! I really would like to buy one as well, the only problem is how could I transfer the money to you. I do have a few Chinese friends in Germany probably I could transfer the money to them and ask them to help make another transfer to you or directly to help me buy it. Regards, Xiaohu.

    Hello Jens,


    Thank you for the link to the book, I learnt about this book for quite a while, but it is a bit difficult to deliver it to China.

    I would like the bellow/ventil combination to put under the under the pallet box but I really would like to find a reference to figure it out.


    Thanks and regards,

    Xiaohu

    Dear ogan builders,


    I have finished the drawing of the keyboard and the frame, the height with out the wind system appears to be already 69cm, approximately the height of a desk. But if I put the wind system below this frame, which add up another 20cm of height, the overall height is reaching 90cm, it is a bit too high? the player needs to sit on a tall chair to play the instrument.


    Best regards,

    Xiaohu



    Hello Samuel,


    Thank you for the nice tour of your harmonium's transposition setup, I understand how it works now. It is interesting that the transposition strip covers an octave. Therefore, the keyboard should have at least 12 extra keys?


    Best wishes,

    Xiaohu

    Hi Jens, thank you for your advice, I've just found the data sheet of your blower and the input power is 50Watts.

    The blower which I have found normally has a input power of 120Watts, I wonder whether they are too big for the chest organ.

    Meanwhile, to regulate the blower to you mean by reducing the drive current of the engine so that the speed drops while both the air flow and the pressure go down? Thanks, Xiaohu.