The Ekdahl FAR - Bowing jack: Difference between revisions

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The entire ''bowing jack'' is riding on an ''axle bolt'' so that it can move up and down. Below the ''bowing jack'' to the side is the ''pressure motor'', this has a ''corkscrew'' attached to its output shaft which is responsible for pushing the ''bowing jack'' up and down. Through this mechanism the ''bowing wheel'' can be moved ~4mm / 3/16" up and down by sending the instruments the various ''pressure''-commands.

The ''bowing jack'' can <u>theoretically</u> be controlled with ~0.625ɥm precision, this is of course nuts and probably not true in the real world - <u>but,</u> very small movements in the ''bowing jack''s position does indeed make quite the difference which adds great complexity.

== Adjusting the bowing jack ==

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If this becomes an issue that is not solved by changing to a fresh ''bowing wheel'', the ''bowing jack axle bolt'' can be adjusted. The ''bowing jack'' is suspended on the ''axle bolt'' using [[wikipedia:Thrust_bearing|thrust bearings]] and rubber washers, resonances can be lowered by adjusting how tightly the bolt is holding the ''bowing jack'' against the bearings. This will have to be done by ear, meaning tightening and loosening the bolt while playing the offensive frequencies while also making sure that no new ''resonant peaks'' are created. It is recommended that this is first done without a ''bowing wheel'' on the ''wheel holder'', once this has been done the same procedure can be done with a ''bowing wheel'' attached (but not touching the string).

{{docnav

|[[The Ekdahl FAR - Bowing wheels|Bowing wheels]]

|[[The Ekdahl FAR - Mute|The mute]]

}}

@@ Line 11: / Line 11: @@
 The entire ''bowing jack'' is riding on an ''axle bolt'' so that it can move up and down. Below the ''bowing jack'' to the side is the ''pressure motor'', this has a ''corkscrew'' attached to its output shaft which is responsible for pushing the ''bowing jack'' up and down. Through this mechanism the ''bowing wheel'' can be moved ~4mm / 3/16"  up and down by sending the instruments the various ''pressure''-commands.
+The ''bowing jack'' can <u>theoretically</u> be controlled with ~0.625ɥm precision, this is of course nuts and probably not true in the real world - <u>but,</u> very small movements in the ''bowing jack''s position does indeed make quite the difference which adds great complexity.
 == Adjusting the bowing jack ==
@@ Line 26: / Line 28: @@
 If this becomes an issue that is not solved by changing to a fresh ''bowing wheel'', the ''bowing jack axle bolt'' can be adjusted. The ''bowing jack'' is suspended on the ''axle bolt'' using [[wikipedia:Thrust_bearing|thrust bearings]] and rubber washers, resonances can be lowered by adjusting how tightly the bolt is holding the ''bowing jack'' against the bearings. This will have to be done by ear, meaning tightening and loosening the bolt while playing the offensive frequencies while also making sure that no new ''resonant peaks'' are created. It is recommended that this is first done without a ''bowing wheel'' on the ''wheel holder'', once this has been done the same procedure can be done with a ''bowing wheel'' attached (but not touching the string).
+{{docnav
+|[[The Ekdahl FAR - Bowing wheels|Bowing wheels]]
+|[[The Ekdahl FAR - Mute|The mute]]
+}}