Αποστολή από: ΣΠΥΡΙΔΩΝ στις Οκτωβρίου 11, 2008, 11:09:08 μμ
Υπάρχουν δύο βασικές χρήσεις για τον Αναλογικό Διαιρέτη.
1. Αλλάζεις την κλίμακα των σχεδίων και
2. Σε βοηθά στο πέτσωμα.
Scaling Drawings
1.The use of this instrument in, say, enlarging your model is obvious, simply set the screw at the enlargement you require, measure from your plan with the small end, and set out work with the other. If you are reducing the scale, then the dividers are used the other way round, measuring with the large end setting off the work with the small.
Fitting Planks
2.The fitting of the plank to underside of the wale and into the rabbet of the stem is done first, and lines representing the centers of the frames crossed by this plank are draw on its face. Let us assume that it has been decided to fit eight planks between the underside of the wale and the center of the first batten, then you set the center screw on your dividers to "8", which means that there is a ratio of 8 to 1 between the two ends of the instrument, so having fitted the upper edge of your plank to the wale, you simply place one point of the long end of the dividers against the underside of the wale in the rabbet of the stem, and the other where the centerline of the first batten enters the rabbet, turn the instrument over and lay one point on upper edge of the plank, and the other will indicate the depth of the plank at that point. Mark this then move to the first frame, open the wide end to the space to be covered on this frame, and with the short end mark the width of the plank on the pencil line representing the crossing of that frame. The sketch will make all this quite clear.
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There is another advantage in using these dividers for setting out the planking, and that is, should any slight error be made in the actual cutting of the planks after marking out, the dividers will automatically correct this in succeeding strakes, since when once the first strake has been laid fore and aft, the dividers will be reset to the number of strakes remaining to be fitted in that particular belt. In the example used here, that means that when fitting the second strake down from the wale the dividers would be set at "7", for the thurd strake "6" and so on. In other words, each space is treated independently and on its own metrits.