Peter KG's Bench

[Patrick KREIT]

Szymon

http://www.ebay.co.uk/itm/2-in-1-Wood-Moisture-Meter-Pins-Scanner-Concrete-Building-Materials-Glass-Peat-/182378908941

[Szymon]

This is the sound of my instrument op.10 Delta 103 Hz - baroque gut strings. This instrument was chosen for the Royal Conservatory of Music in Copenhagen among seven other instruments. This is my greatest success. But I do not know how after 3 years these violins are playing if the delta is getting bigger.

[WorksAsIntended]

I cant really judge the sound as the recording is not of a very high quality. 

However the response seems really good and the overall volume quite even. I'd say very well done!

[Patrick KREIT]

Szymon

On a baroque violin, the strings exert less pressure, which should not modify: 1) the back plate’s shape  2) the B1+ frequency  3) the delta.

www.kreitpatrick.com

[Szymon]

16 hours ago, WorksAsIntended said:

I cant really judge the sound as the recording is not of a very high quality. 

However the response seems really good and the overall volume quite even. I'd say very well done!

Great thanks for the nice words

[Szymon]

1 hour ago, Patrick KREIT said:

Szymon

On a baroque violin, the strings exert less pressure, which should not modify: 1) the back plate’s shape  2) the B1+ frequency  3) the delta.

www.kreitpatrick.com

Thank you Master for the words of consolation. I hope that at the Copenhagen Conservatory do not regret the choice.

[Szymon]

Here are screenshots of fresh instrument measurements and after a week of use by a professional violinist. In addition to the B1- and B1 + changes, there is no defect in the image that Don wrote:
 

Quote

 "I do not think it would sound very good due to the weakness from 1400 to 3500 Hz, and the critical range for clarity, and the overwhelming strength of 4 kHz, often associated with harshness."

The frequency range up to 13 kHz has widened.
The sound is clearly softened and more homogeneous. Next Thursday / Friday I will make new measurements and probably change the bridges.

[Peter K-G]

Very interesting Szymon!

Your spectrum graphs are very similar to mine. The bridge hill is more to the right than mine (higher frequency range). This would be an indication of heavier plates or thicker (in relation to the woods density).

As stated many times, they are not a reliable reflection on how it is in reality, but they are very useful to your self when you know your violin and its other data.

The violin in your You Tube post seams to function very well

 

[Szymon]

This is my excel sheet with weight data and M2 / M5. You are right - free boards are actually quite heavy, but I do not have better wood.

[Patrick KREIT]

Szymon

Your violin’s B1+ mode frequency has dropped 8 Hz, and the B1- mode frequency has dropped 15 Hz, i.e., nearly twice as much: this is the effect of a very good chin rest.

A new violin may require several adjustments (bridge, sound post). With time, the structure will be modified until the forces in play reach equilibrium, and after the varnish has dried completely.

www.kreitpatrick.com

[Szymon]

I would like to share with you the excel sheet I made a few years ago. stiffness.xlsx

I use it for current work and archiving data from recent instruments. Data from free disc, Patrick's  coupling frequency up to the finished instrument. It is in English. As you can see on the screen - I have data from 6 instruments. I hope you will be helpful and will be helpful.

[Peter K-G]

Thank you for sharing!

(Sorry about the delayed reply, been very busy lately)

[Szymon]

After entering the frequency of the plates this spreadsheet counts:
According to the formula of Nigel Harris:
1. Stiffness factors of the plates
2. Balance factor
3. Quality factor
Otherwise -
1. All deltas.
2. M2 / M5 ratio

3. Hz/gram

I found one error - it is written at H3 and H4: gram / Hz, it is supposed to be: Hz / gram

 

[Peter K-G]

Varnish cooking time (July every year)

http://www.thestradsound.com/ongoing/varnishcooking15072017

[carl1961]

53 minutes ago, Peter K-G said:

Varnish cooking time (July every year)

http://www.thestradsound.com/ongoing/varnishcooking15072017

thanks for your updates and progress, can pickling lime be used for the lime paste, I cannot find lime paste in US

[Peter K-G]

The link on my site to Kremer Pit Lime 31800 is out of date, here is a new link on Kremer's site to 31800

http://shop.kremerpigments.com/en/fillers-und-building-materials/limes/4894/pit-lime

[carl1961]

26 minutes ago, Peter K-G said:

The link on my site to Kremer Pit Lime 31800 is out of date, here is a new link on Kremer's site to 31800

http://shop.kremerpigments.com/en/fillers-und-building-materials/limes/4894/pit-lime

Thanks Peter, Awesome!!

[Patrick KREIT]

5 hours ago, Peter K-G said:

Varnish cooking time (July every year)

http://www.thestradsound.com/ongoing/varnishcooking15072017

It seems to me that the color is darker than the previous samples.

www.kreitpatrick.com

[Peter K-G]

Successful batch, after 10 hours of cooking it is dark enough to non add colors/pigments when varnishing anymore

http://www.thestradsound.com/ongoing/varnishcooking15072017

Album: https://photos.app.goo.gl/eTnryGmEom3565kx1

I wonder if this is the annoying Stradivari red Marty talked about in another thread

 

 

[carl1961]

Looks like nice color , now to see it on some wood, 10 hours of work, but you know what your varnish is. have you ever used the Gamboge ground, from VIOLIN-MAKING: AS IT WAS AND IS. page 179 (212 pdf book), and also on page 294 (332 PDF book) your red varnish over that would look nice I bet.

[Guest]

Carl

If you apply anything close to red over that yellow I'm certain you will not like the result. You will have blaze hunter orange color, That yellow is too yellow unless you tone it way down. Better to start off with a color that matches natural UV tanned wood and then add some yellow gold but not too much. Getting the right color into the wood prior to ground is trickey and to me the challenging part of finishing because every piece of wood is different.

[carl1961]

19 minutes ago, lpr5184 said:

Carl

If you apply anything close to red over that yellow I'm certain you will not like the result. You will have blaze hunter orange color, That yellow is too yellow unless you tone it way down. Better to start off with a color that matches natural UV tanned wood and then add some yellow gold but not too much. Getting the right color into the wood prior to ground is trickey and to me the challenging part of finishing because every piece of wood is different.

ok nice to know, my last violin was a casin ground and it was very light  rubbed in  and with 3 coats of the amber varnish it still looks yellowish in the light.

[Guest]

5 minutes ago, carl1961 said:

ok nice to know, my last violin was a casin ground and it was very light and with 3 coats of the amber varnish it still looks yellowish in the light.

I haven't done a casein ground so I don't know what color you started off with. Pm me photos if you have them.

What brand of amber varnish did you use? Where did you buy it?

[carl1961]

1 minute ago, lpr5184 said:

I haven't done a casein ground so I don't know what color you started off with. Pm me photos if you have them/

don't remember if I did pictures of the casin, I did tan the violin with UV lamp.

[carl1961]

22 minutes ago, lpr5184 said:

I haven't done a casein ground so I don't know what color you started off with. Pm me photos if you have them.

What brand of amber varnish did you use? Where did you buy it?

Alchemist  Amber Varnish Linseed Dark  what I used on violin 

I also bought some Venetian Amber Varnish  never used any yet