Revision [4999]

Last edited on 2017-09-10 12:21:57 by Vojtech Blahout
Additions:
~1) Carefully observe the distance of the purfling channel from the edge in the copied instrument. Normally it is about **4 mm** in but its final position is also influenced by the length and width of the top and bottom corners. The purfling mitres must meet at just the right position to form the tip and the bee sting. --- ---The corners are constructed as in **Fig. 2 and 3.** The red line indicates the outline linearly inset by **3.7 mm**. The green line shows the lines altered so that they form a sharp tip and meet at the correct distance from the corner`s end. The black line is the final approximation taking into account the preference that the purfling in the corners should be leaning a little, following the bee sting. The bee sting itself is in blue and flows naturally towards the inner tip of the corner.
~1) Everything adjusted, you can start marking the purfling channel. Especially with spruce, it is important to first go very lightly, otherwise the blades tend to get misaligned by the wood grain having the tendency to go along with it. It is also important that you hold the purfling marker at a constant, perpendicular angle. --- ---Bear in mind that you are just marking the channel, not actually cutting it at this point, so create a rather shallow cut but with great precision which will later serve as a guideline for the cutting knife itself. Again, go light, or you will loose precision. Repeat, until you are sure the groove is deep enough to guide the knife.
Deletions:
~1) Carefully observe the distance of the purfling channel from the edge in the copied instrument. Normally it is about **4 mm** in but its final position is also influenced by the length and width of the top and bottom corners. The purfling mitres must meet at just the right position to form the tip and the bee sting. --- ---The corners are constructed as in **Fig. 2 and 3.** The red line indicates the outline linearly inset by **3.7 mm**. The green line shows the lines altered so that they form a sharp tip and meet at the correct distance from the corner`s end. The black line is the final approximation taking into account the preference that the purfling in the corners should be leaning a little, following the bee sting. The bee sting itself is in blue and flows naturally towards the corner of the corner.
~1) Everything adjusted, you can start marking the purfling channel. Especially with spruce, it is important to first go very lightly, otherwise the blades tend to get misaligned by the wood grain having the tendency to go along with it. It is also important that you hold the purfling marker at a constant, perpendicular angle. --- ---Bear in mind that you are just marking the channel, not actually cutting it, so create a rather shallow cut but with great precision which will later serve as a guideline for the cutting knife itself. Again, go light, or you will loose precision. Repeat, until you are sure the groove is deep enough to guide the knife.


Revision [4795]

The oldest known version of this page was created on 2015-12-18 12:04:18 by Vojtech Blahout