Beiträge von Xiaohu Wang

  • drawing of a chest organ

    Hello dear friends of organ building, sorry to interrupt, but I found another blower seems to be better, this one has a dimension of 277mm by 272 mm by 126mm. and has an air flow of 210 m3/hour (3.5 m3/min), 120W of input power with pressure 1200pa, the pressure maynot be too accurate I think it would be lower than the marked value. Looking forward to hearing your comments. Xiaohu



  • drawing of a chest organ

    Hello Jens and Jürgen, I think I have found one possible solution which cost around 20 €. Here are the parameters and pictures for it. Looking forward to your comments. Have a nice weekend, Xiaohu



  • drawing of a chest organ

    Zitat von JGB

    Hi Xiaohu, pressure in Pascal is about ten times the pressure in millimeters of water column. If you want 45mm or 450 Pascal in your instrument you have to add a little bit in order to have some margin for pressure regulation with the bellows/ventil combination. So I would suggest having a blower that can deliver 60mm or 600 Pa. There are also special organ blowers in the market like the ones from organparts.info but they are rather expensive. If you can afford it, take such a special blower: they just work as intended. Else, you have to experiment a little bit. I use a 2nd hand ebm RG148 blower (now ebmpapst) that can be regulated. But it can only handle about 1 or 2 organ stops. Regards, Jens

    Hello Jens, Could I ask for the parameters of your RG148 blower? the electric power and air flow and wind pressure etc.? Since I could not afford an special organ blower I am searching for alternatives. Best, Xiaohu

  • drawing of a chest organ

    Hello Samuel and other fellow organ builders,


    Ich kann nur ein bisschen Deutsch sprechen, therefore I use English to write and I don't know why in the previous post the language switches to my mother tongue Chinese and thank you for letting me know the deepl website, I use google translate8o


    I am now searching for the suitable blower for some time on the online shops in China, there is no suitable organ blower for sale in China and I am searching for the alternatives.

    I found that the pressure of 450pa or 45mm of water would be enough and try to make the blower as small as possible, my plan is to build two stops with 8foot and 4 foot pipes. I found two blowers cost around 20 euros, but I don't know whether this will meet the needs, but it is the best I could found. The first one has very small dimension:


    The parameter of the second one is better but it is too high (260mm) for a chest organ?


    Looking forward to your comments and advice,

    Best regards,

    Xiaohu





  • drawing of a chest organ

    Hello Juergen!

    So nice to talk to you and thank you for this information, I will consider changing the height of the upper keys, but at present I will stick to Samuel's suggestion to make the height to be 10mm and 8mm press depth as shown in the graph below. I also make a little adjustment at the back which the keyboard frame can be lifted up and rotate a little that facilates the transposition.

    Thanks again and best regards, Xiaohu



  • drawing of a chest organ

    Zitat von JGB

    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

    Dear Jens, thanks so much for your kind suggestion. I am planning to build this chest organ mainly for the purpose to play hymns or Bach's works or maybe could borrow to the local baroque ensemble as continuo. I ended with note E as copied from Mr. Theo Koele's organ e5. Thanks and best regards, Xiaohu

  • Bau Truhenorgel mit Prinzipal (Fortsetzung)

    Hi Jens,


    Thanks for the detailed description regarding the trigger, I finished the drawing of the top part of the trigger as shown below, I am planning using the short wooden slats than change the direction by metal rod. But I think your method is more weightless and easy to fine tune. Thanks so much for sharing. Meanwhile, what this the height of your pallet box? I am now drawing this part and would like control the height as small as possible.


    Best wishes, Xiaohu


  • drawing of a chest organ

    嗨塞缪尔，

    非常感谢您提供这些详细信息，这真的很有帮助。我将八度音阶尺寸调整为 160 毫米。上键高度降低到8mm。

    正如您建议的那样，我正在尝试通过在实际组装时添加 2 毫米的毡层来将压下的深度降低到 7-8 毫米。


    我仍在研究键盘框架和移调机制，希望我能尽快提出解决方案。

    最好的祝福，

    Xiaohu

  • drawing of a chest organ

    Hello Samuel,


    Thanks for the information, it is really very helpful indeed, I will remember to make the surfaces smooth for a clean transition.

    Meanwhile, do you mean that the sharp and flat keys are too high? It centainly appears so, I will reduce the height of those keys. what is the suggested height?

    I would also like to ask what is the normal displacement of the key when pressed down? now my design is around 10mm, it is too large? I find in Jens's design is 6-8mm.

    And the octave span distance for my drawing is 147mm, is it a bit small? comparing to that of the modern piano which is around 165mm for an octave.


    Thank you and have a nice weekend, Xiaohu

  • drawing of a chest organ

    Hello Jens,


    Thank you for the video, it is very useful. The reason I choose to shift the keys and the key frame together is because I didn't know how the conventional method works: first lift up the keyboard at the front and then make the shift.


    I made a slight adjustment at the back of the keys according to the design by Mr. Koele's, I think this would help to confine the keys undesired horizontal movement.


    Next I will draw the rods connecting the keyboard and the pallet.


    Greetings, Xiaohu


  • drawing of a chest organ

    Zitat von SamES

    I have a harmonium from the 1850s that has a very simple but effective transposing device. The key frame runs in a groove at the back and can be lifted at the front and then fixed with the pin in one of the holes. This way you can transpose a whole octave, but you need a lot of extra keys which disappear under a flap when not in use. The pin does not release the shifting of the key until the keys are raised far enough to no longer scratch on top of the rods. This also takes Jens' hint into account.

    Greetings! Samuel


    Thank you so much Samuel,


    I roughly understand the mechanism, but could you possible show more photos or maybe show a short video could be more helpful?^^


    My idea is that the keys together with the key frame shift during transposing, similar to the harpsichord video show by Jens.


    But I think the conventional method is by lifting up the keyboard at the front and then make the shift. But I don't know the exact mechanism.


    Best regards! Xiaohu

  • drawing of a chest organ

    Hi Jens,


    Thank you so much for your encouragement, it will take much longer time for me than the professional builder thus 630 hours is a minimum estimate😂 I think it would take twice the time. But it is real pleasure and fun to share and learn about the chest organ during the process, and kind builders like Mr. Koele and you and many others to offer generous help, otherwise it is simply impossible to built one.

    I am now trying to figure out the transposing mechanism, I came up with a solution but still working on the CAD drawing, I will post the solution later and I hope to receive your further comments, thanks in advance.


    Best,

    Xiaohu

  • drawing of a chest organ

    Hello everybody, I am from China and I would very much like to build a chest organ, I think I shall start by making the 3D drawings first.

    My goal is to follow the design by Mr. Theo Koele opus 5 https://www.kistorgels.nl/

    I would very much appreciate your help and give advice during the process, I wish I could finish this by a year I know it is extremely challenging but worth trying.

    I would like to start with the keyboard, I put some picture of the design, looking forward to receive advice and comments, thanks in advance.

    Best regards,

    Xiaohu Wang


  • Bau Truhenorgel mit Prinzipal (Fortsetzung)

    Thank you Jens, therefore the transposing of frequencies is not needed anymore? Since chest organ mainly uses as basso continuo for baroque music, meantone temperament instead of equal temperament is used for tuning. Thus, the transposing is less useful nowadays?


    Thanks and regards, Xiaohu

  • Bau Truhenorgel mit Prinzipal (Fortsetzung)

    Sorry Jens, for misspelling of your name, and I finally know that the original meaning is "Yahweh has been gracious".


    So the brass tube holds two rods, a long one and a short one on each end, with a gap of 3-4mm for the bass tube to bend? I think I finally understood.

    But in order to stay air tight and lifting weight of the rod and the brass tube, what is the required force or the pound of the torsion spring on the pallet?


    "There is a 1:2 down ratio in the keys because the rods are connected at about the middle of the keys, so the movement of the rod is only about 3 to 4 mm"

    Therefore, the movement at the end of the key is 6-8mm? Is there a positioning hole at the middle of the key to hold the rod? Or how to position the whole keyboard making the a row of rods at their position? Is there also consideration for the transposition of frequencies? say from 414 to 440 Hz, shifting the whole keyboard right or left.


    Thanks and regards,

    Xiaohu

  • Bau Truhenorgel mit Prinzipal (Fortsetzung)

    Hi Jans,


    One more question, you mentioned "The pallets have springs that keep them close and this spring is strong enough to also lift the rods and the keys," therefore, if there is no rod, the keyboard is actually in the pressed down position? while the string of the pallet lifts up the keyboard to horizontal position through the rod? Could you show a photo for the status of the keyboard when there is no rod lifting?


    Thanks again,


    Xiaohu

  • Bau Truhenorgel mit Prinzipal (Fortsetzung)

    Hi Jens,


    Thanks so much for your kind reply, does the brass tube at bottom end of the rod serve to bend the fiberglass rods ? Therefore, the brass tube is also slightly bent to guide the fiberglass? This is really a novel design then the traditional wooden ones or metal rods, but does it have any cons?

    Meanwhile, does the brass tube also use as a 'stopper' to prevent excessive action on the pallet? Or is the displacement of the keyboard actually limits the rod from going down to much?

    Also does the bottom end of the fiberglass rod need to air seal, to prevent air leakage through the hole for the rod when the pallet opens?


    Thanks for your patience and looking forward to read your reply, best wishes^^


    Xiaohu


  • Bau Truhenorgel mit Prinzipal (Fortsetzung)

    Hello Jans,


    Could you show some of the details regarding the other end of the rod connecting the pallet? I roughly understand the mechanism between the keyboard and the pallet but what is the material for the rod and how to avoid the rod's own weight not to open the pallet. Thanks and greetings from China:)


    Xiaohu