Tsun (Cun) Meter / Acupuncture Point Marker
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A tsun (or cun) meter, an acupuncture tool used to locate acupuncture points through body proportions.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Medical Tools
- Licencja
- Creative Commons — Public Domain
A tsun (or cun) meter is an acupuncture instrument used to locate acupuncture points by measuring the patient's proportional body inch, known as a "tsun" or "cun". It translates a patient's individual "1 tsun" measurement (the distance between the creases of their bent middle finger) into accurate 0.5, 1, 1.5, and 2-tsun distances.
HARDWARE
This is designed for a M4x10 hex bolt and M4 hex nut. These are widely available in Europe. The head of the hex bolt is 7.75mm x 6.9mm. The stem of the bolt is 10mm long, with a 4mm diameter. (See picture.) If a hex bolt and hex nut is used, then the caliper can be tightened and loosened without the need for a screwdriver.
PRINTING INSTRUCTIONS
Use any PLA Filament.
To avoid warping:
slice with a 2mm brim
use a smooth plate, with some adhesive such as hairspray or glue
let the print cool on the plate before removing
If the caliper does not turn smoothly, you could print 1 - 3 washers. They should be placed in between the front and back piece.
SCALE
If you scale this print up or down, keep the X and Y axes scaled to the same amount. This caliper does not function unless the arms remain at the same ratio from each other. Z (depth) can be scaled up, if you want the arms to be thicker, they are currently 3mm deep.
The dimensions of this cun meter are the same as the ones you can buy online. This is what modern acupuncture professionals use. The distance from the rotational center to each tip is:
25mm 0.5 cun
50mm 1 cun
75mm 1.5 cun
100mm 2 cun.
I suspect the ancient cun calipers would have been a little smaller, because 1 cun is actually 33.33mm! Most likely the distance from the center to each tip would have been:
16.67mm 0.5 cun
33.33mm 1 cun
50.00mm 1.5 cun
66.67mm 2 cun
You can learn about Chinese units of measurement on Wikipedia. I have not yet tested a resized caliper with an acupuncture professional. Use at your own risk.
OTHER
This model is available on Printables, Thingiverse and Makerworld.
Feel free to ask questions.