Felge und Nabe messen, um Speichenlängen zu berechnen: Unterschied zwischen den Versionen

Felge und Nabe messen, um Speichenlängen zu berechnen (Quelltext anzeigen)

Version vom 21. Februar 2022, 12:17 Uhr

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→‎Der Speichenlochkreis und der Speichenlochdurchmesser: Bilder hinzu

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@@ Zeile 165: / Zeile 165: @@
 ===Der Speichenlochkreis und der Speichenlochdurchmesser===
-Hub flange dimensions
+[[Datei:Spocalc hubdims.gif|right|Speichenlochkreisdurchmesser (d) und Speichenlochdurchmesser (S)]]
+Die Achse der Nabe ist im Weg, wenn man den Durchmesser des Speichenlochkreises (d in der Illustration rechts) messen möchte. Der Speichenlochdurchmesser (S) hat ebenfalls Einfluss auf die Speichenlänge.
-The axle gets in the way when measuring the diameter of the circle of spoke holes (d in the image at the right). The spoke hole diameter (S) also affects spoke length.
+The traditional way to measure the spoke hole circle diameter is with a caliper, as shown in the image below, center to center of the spoke holes, but it's easier to measure from the right side to the right side, or left side to left side. You can't get a "contact" measurement this way, but inaccuracy of a small fraction of a millimeter isn't going to be important here. If you're a real stickler, you could insert the outside-measuring blades of the caliper into the spoke holes to take a smaller measurement, and the inside-measuring blades (at the top in the picture) to do a larger measurement, then take the average. Subtracting the smaller from the larger measurement and dividing by two would also give you the diameter of the spoke holes -- but that is usually 2.5 to 3 mm, and the resulting difference in spoke length isn't large enough to matter.
-The traditional way to measure the spoke hole circle diameter is with a caliper, as shown in the image below, center to center of the spoke holes, but it's easier to measure from the right side to the right side, or left side to left side. You can't get a "contact" measurement this way, but inaccuracy of a small fraction of a millimeter isn't going to be important here. If you're a real stickler, you could insert the outside-measuring blades of the caliper into the spoke holes to take a smaller measurement, and the inside-measuring blades (at the top in the picture) to do a larger measurement, then take the average. Subtracting the smaller from the larger measurement and dividing by two would also give you the diameter of the spoke holes -- but that is usually 2.5 to 3 mm, and the resulting difference in spoke length isn't large enough to matter.
+[[Datei:Spoke-diam-sm.jpg|center|Speichenlochkreisdurchmesser mit dem Messschieber messen]]
-Measuring hub flange diameter with a caliper
+[[Datei:Spokecircle-sm.jpg|left|Speichenlochkreisdurchmesser mit einem improvisierten "Messwerkzeug" messen]] You don't need a caliper. You could cut a C-shaped recess in a piece of cardboard, mark the spoke-hole spacing as shown in the photo at the left, and then measure it with a ruler.
-improvised measuring tool You don't need a caliper. You could cut a C-shaped recess in a piece of cardboard, mark the spoke-hole spacing as shown in the photo at the left, and then measure it with a ruler.
 ===Flanschabstand von der Mittellinie===