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Pin torque increase when strung
#2851839 05/24/19 03:10 PM
Joined: Nov 2018
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Hello,

Just wondering what the general value of torque increase is once the string is pulling on the pin? I have epoxy-ed the plank and am experimenting with bit sizes for optimum tightness, but don't them too tight once up to pitch!

Many thanks
George

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Re: Pin torque increase when strung
gevans10 #2852201 05/25/19 07:22 PM
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I have found that roughly .010" difference between drill and pin makes for a pretty good feel and adequate torque with an epoxy filled pinblock. However, there is not much tolerance for turning the pin back and forth. Once you drive it in, 95% of any pin turning should be clockwise.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8
Re: Pin torque increase when strung
gevans10 #2852312 05/26/19 08:12 AM
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I have found a torque bar today and the readings that the pin should be when unstrung from the Reblitz book. Around 100 in lbs is optimum, 60 ish minimum.

I used the grinder to adjust a couple of installed pins to fit my socket and a 7.16mm (.282) in a 6.8mm (.267) hole was far too loose. Only getting around 70 in lbs from a 7.26 (2.86) in a 6.8 mm hole. This is 0.46mm (nearer 20 thou) which sounds like quite a lot to me!

I tried a 6.5mm bit and 7.16 pin and it was incredibly tight so I I know the resin is hard enough. I guess it just depends on the resin itself and how it's cured for the right level of interference. I'm using the West stuff.

I guess I'll just have to fork out for a 6.6 and 6.7mm bit and keep playing

Re: Pin torque increase when strung
gevans10 #2852319 05/26/19 08:51 AM
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Yes, you will need to experiment to find the right combination for your specific situation. That's what I had to do. I was using slow curing System Three Epoxy...different stuff.

What do you mean though that you used a grinder to adjust installed pins? I cannot visualize this.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8
Re: Pin torque increase when strung
gevans10 #2852332 05/26/19 09:43 AM
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I only have two pins in at the moment, for testing. I don't have the tuning pin socket for a wrench so I used a thin disc to whizz of the edges of the pin a bit to make a normal 6mm socket just about fit. They're scrap anyway and it wasn't enough to heat and expand them in their hole. Just wanted to get a reading from the torque bar

Re: Pin torque increase when strung
gevans10 #2852499 05/26/19 06:45 PM
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Oh...I see.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8

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