John Yes and the horse said later two expert gluers can cover about two hundred and forty set of hammers in ten hours on one machine. (hydraulic) that is exaltly my point John post me a hydraulic presses hammer #1 that got the same tension that l could make with the Dolge presses and I will buy the machine... Serge 2008/10/17 John Delacour <JD at pianomaker.co.uk> > At 08:53 -0400 17/10/08, Serge Harel wrote: > > The better the felt the more sensitive the are that why Ray and me has good >> result with our old fashion way to make hammer. >> The hydraulic could not make tension hammer like l do on the picture. >> > > Serge, pressure is pressure, and the only difference I can tell between > pressure applied by screws and pressure applied by hydraulic or pneumatic > rams is that with these the pressure can be accurately measured and > differentially applied. As Dolge says, speaking of machines younger than > yours: > > "...with the present machines, the operator has no control over the > pressure exercised; he does not know but has to guess whether the felt is > pressed down sufficiently or not. The rigidness of the covering machine > does not permit of any variation in pressure to be used, so necessary on > account of the uneven texture of the felt..." > > There you have it from the horse's mouth. > > JD > -- phone 514-750-4522 cel 514-569-4414 Piano Perfecto 5932 rue Viau Montreal Qc Canada H1T 2Y4 Piano Shop 17 Ronald Drive Montreal West, Qc Canada H4X 1M9 -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20081017/7cf9bcad/attachment.html
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