Michael K.

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Posts posted by Michael K.

  1. On 1/25/2021 at 12:53 AM, Don Noon said:

    I have had good success lofting the central part of the arch (from the lowpoint inward), but that tricky part with the corners is still unresolved at this point.

    However, there are other CNC-ish things that may be of interest.  The thing that got me diverted was thinking about counterforms for holding ribs against the inside form.  The ones I made have been adequate, but they were made on my previous machine when it had a slight skew to the X-Y axes, and there were some other things that bothered me as well.  Making full-height counterforms on the CNC was a huge pain and effort,... so I got to thinking about 3D printing.  After a brief bit of research and finding out how inexpensive (~$200) and good they were these days, I ended up with this on my "other" bench:         929259795_3Dprinter.JPG.dfc0f4b32dd1b72e96e70a9be579d068.JPG        And pretty quickly started making stuff...

    1161140643_Cclamps.JPG.8571ebf798f11dbe4073fdc4fbc38e75.JPG824562299_Cclamp1.JPG.2900c760cd76b8be6a23f2263b45652e.JPG83200698_Cclamp2.JPG.596ff47de15da387e5e595e6ec2f6320.JPG

    On the left (in the left photo)  is the first "flexure" design C-bout counterform made on the CNC from stacked plywood.  Too stiff, no flex.  Next to that is a thinner one out of MDF; better, but still too stiff.  Making it thinner would be difficult on the CNC... so the first 3D printed one was the identical design, just to see the difference in flex (still stiff).  Next, I added flex sections.  Acceptable, but while I was doing this I was thinking about improvements, which are in the last (so far) design:  evened out the leg angles, added center spring to put some pressure in the middle, and added a pocket to keep the fence clamp from skating around while tightening.  I had to split the center spring zone to accommodate 7 clothes pins for the lining installation.

    I have to say that the 3D printer is extremely nice for not needing setup.  No bits to change, spoilboads to deal with, or how to hold down the wood and the cutout parts, no dust, no noise.  Just push the button, and (many hours later) the part is done.

     

    Amazing. Could it work for Cello too?

  2. 1 hour ago, CSchabbon said:

    The problem with technical gel is it is horrible to work with. It gels within seconds and the gel is rock hard. Also although those numbers sound great, it is actually very weak, it does not stick to the wood.  WEAK GLUE JOINTS!

    I have worked with technical gel, also this one. It's really not made for woodwork. 

    These are product of the chemical industry. Good for making matches maybe.

    I not understand this. Never had any of this problems. Weak glue joints are most a result of a bad joint not of a bad glue.

  3. I personal use the glue from company Schilbach. So far the best on the market. There are two kind available with different characteristics.

    Both are cleaned and have "Medicinestandart". Anything penetrates the Wood is nearly  invisible.

    https://www.shop-schilbach.net/epages/79837849.sf/en_GB/?ViewObjectPath=%2FShops%2F79837849%2FProducts%2F810195

     

     

    • Specially purified

    • Excellent adhesive properties

    • Gel strength 60-120g Bloom

    • Viscosity 1,80-2,70mPas

    • PH* 5,00-6,00

    • Transmission** 620nm >=85%

    • Transmission** 450nm >=60%

    https://www.shop-schilbach.net/epages/79837849.sf/en_GB/?ObjectPath=/Shops/79837849/Products/810201

    • Extremely clear

    • Highly pure

    • Extraordinary adhesive properties

    • Gel strength> = 250g Bloom

    • Viscosity 4.00-4.70mPas

    • PH* 4.90.-5.20

    • Transmission** 620nm> = 92%

    • Transmission** 450nm> = 78%

    LUT_Universal_Leim_Gelatine.jpg

    IMG_4964.jpg

  4. If we compare the arching contours between Sacconi (The secret of Stradivari) and  Sergei Muratov (The Art of Violindesign), it is noticeable that with Muratov the contours of Violin, Viola and Cello increases faster from the edge than with Sacconi, where by both occupy almost the same height in the middle. On both, Top and Back. What is preferred? Advantages and disadvantages?

    http://zhurnal.lib.ru/m/muratow_s_w/violin_design.shtml

  5. 1 hour ago, Michael Szyper said:

    I am going to be there, unless the situation changes, which can happen pretty fast. 

     I cancel my Booth some weeks ago as many regular exhibitors did. I think this year we see more a local show with much lesser international exhibitors and visitors. 
    But I will go for a day or two.

  6. 10 hours ago, Michael Szyper said:

    BTW, was nice to meet you there last year!

     

    8 hours ago, Davide Sora said:

     

    It was a pleasure to meet you both, I look forward to seeing you soon.

    Was a pleasure for me too. Such a nice and funny time we had at the Via Mercatello outside with Wine and Food. Hope this come again.
    Happy Eastern to all!

    Michael: Say hi to your wife, and when all is over and the time allow, please come over to us. We are just a jump away.

     

     

  7. 19 hours ago, Michael_Molnar said:

    You won’t like what scientists predict. If they are just half-right, there will be no VSA.

    Dr. Dena Grayson is an expert.

    https://www.drphil.com/videos/pandemic-expert-predicts-second-even-worse-wave-of-coronavirus-infections-next-winter/

     

    Not only VSA! I guess no Mondomusica in Cremona and China Music in Shanghai as well. I could be wrong but this all has also a strong influence in peoples mind even if all goes down quick.
    Many would be still worry to travel larger distance. What if I suddenly fell ill of Covid-19 in foreign countrys? (Yes anything can happen).
    And people will think twice now for what they spend money. The whole Violinbusiness will get hammered this year and probably the next as well.
    And as long as there is no vaccine for everyone around the world,  our lives and actions will be limited.
     

  8. I have contact to some makers in Cremona. So far i know nobody of them is infected right now. Happy are those who have their workshop at home. Some packed tools and materials in the last day before lockdown and work from their home. Others are very worry, sitting at home and can do nothing. Of course their are no dealers and customers in the city. Business seems to be down complete.