Two more on-line images of the Overs-Kawai 200 grand piano

[Overs Pianos]

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Hi all,

David S., you mentioned that the images online weren't as clear 
compared to the image Terry posted. The images were shot with a 7Mp 
Sony camera, launched in Photoshop and resized and resampled to 72 
dpi for the web. The images certainly seemed quite sharp on-screen 
when I prepared them, but things can go wrong when the file is 
uploaded. It is also possible that for some of the images there was 
some camera movement, since the larger overheads were taken with the 
camera held overhead just under the 9'2" ceiling level of the 
workshop. On the other hand, I have known instances where web 
browsers will display images at a different magnification to that of 
the original document. Occasionally a browser will make serious pixel 
errors when it re-samples an image, displaying it at a different 
size. I have noticed that Firefox isn't as capable at handling jpgs 
as Explorer on a Mac. Although it isn't sufficient reason for me to 
use Explorer. Firefox is so much faster I wouldn't think of using 
anything else at this time. If you are having trouble seeing the 
images clearly, drag them from the browser window to the desktop and 
open them in Photoshop at 100%. I digress.

I thought some of you might be interested in seeing an image of the 
plate struts which we fitted between the pinblock flange and the 
belly rail. Here's an image of the upper most one which is located on 
the break between the agraffe and first capo section. The main body 
of the strut is made from 0.5" mild steel bar, with a 60 degree taper 
turned at each end. A countersunk hole is drilled into the plate 
flange with a centre drill, to receive one end of the strut, while 
the other end fits into the end of a fitting made from 11 mm 
hexagonal free machining steel. A turned thread on the fitting is 
wound into a female thread which is cut into the belly rail. The 
thread is 0.5" Whitworth with a 70 mm length of thread contact. When 
the plate is installed the machined fitting (which is firstly wound 
all the way into the belly rail female thread) is then screwed out to 
make the strut a neat fit at each end. I don't apply any preload. 
There will be more than adequate load on the strut by the time piano 
is pulled up to pitch. For our 225 piano, we fit a strut to each of 
the string breaks in the treble section. I suspect that this measure 
might also help tuning stability. The house technician at Sydney 
Conservatorium reports that our 225 no. 5 is the most tuning-stable 
instrument in their entire fleet of grand pianos. It sometimes shares 
the same recital hall as a couple of late model Hamburg Ds. So both 
pianos on occasions are sharing the same environmental conditions.

http://www.members.optusnet.com.au/ronovers/overskawai6.jpg

Apologies for the sostenueto tongue line. These dampers have had only 
one regulation since their installation. They are due for a second 
reg'.

The final image below shows an end shot of the Kawai action with the 
Overs action parts fitted. The hammer rail is just about right 
without any modification. The only hammer flange modifcation is 
shortening it by 1 mm. The wippen rail has to be cut narrower using a 
tungsten saw blade, then relocated closer to the hammer rail by 12 
mm. So in all, there's isn't much involved in fitting an Overs action 
to a standard KG series keyboard, rails and brackets.

http://www.members.optusnet.com.au/ronovers/overskawai7.jpg

Ron O.
-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
_______________________

Web http://overspianos.com.au
mailto:ron@overspianos.com.au
_______________________
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