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 Re: Mystery Screws
Author: Chris P 
Date:   2017-03-23 20:12

And this is where flute and oboe makers differ - oboe makers prefer the use of pinning screws whereas flute makers prefer to use knock pins.

Pearl flutes use tiny grub screws to lock the various 'pinned' mechanisms together so none of the steels are drilled through which is only a point of weakness. But the grub screws can sometimes work loose or the locked parts can slip causing adjustments to go out.

B&H flutes (those Buffet 'Cooper Scale' things) had both pins and also some splined steels that were fitted into key barrels to lock them in place without pins, but they too could work loose.

A pinned mechanism is the easiest way to remotely move a lever from a distance while other keys are loosely fitted onto the same steel and work independently to the pinned pieces. The only other way around this is to have long bridged keys which are easier to get damaged. Older saxes often had long bridged low B keys that shared the same rod screw as the low Bb key, but they can get in the way during playing (as in the old Conn X bar baris).

On modern oboes you typically have three pinned mechanisms - the top joint trill beam (but not always), the RH C#/Eb cluster (sometimes the C# key is bridged) and the feather keys. Marigaux oboes have another pinned mechanism on the bell where the bell vent and bell key work independently - the bell vent is opened when low B is played and the bell key for low Bb is mounted on the pinned steel for the bell vent. Older ring key oboes may have the RH3 ring key pinned to the steel to close the F# pad cup. Some cors anglais may have a pinned steel for the LH1 split top plate. Schreiber student model oboes have a pinned 1st and 3rd 8ve key, so the 3rd 8ve key is mounted freely on the 1st 8ve steel - the back 8ve touch and lever for the 1st 8ve are pinned to the steel.


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 Topics Author  Date
 Mystery Screws  new
Barry Vincent 2017-03-22 03:35 
 Re: Mystery Screws  new
jhoyla 2017-03-22 12:27 
 Re: Mystery Screws  new
Barry Vincent 2017-03-22 13:25 
 Re: Mystery Screws  new
Chris P 2017-03-22 21:22 
 Re: Mystery Screws  new
Barry Vincent 2017-03-23 02:18 
 Re: Mystery Screws  new
Chris P 2017-03-23 20:12 
 Re: Mystery Screws  new
Barry Vincent 2017-03-24 00:33 

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