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Thread: Post a picture of what's on your bench?

  1. #1651
    I really look like that soliver's Avatar
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    Default Re: Post a picture of what's on your bench?

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    First coat of varnish.
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  3. #1652

    Default Re: Post a picture of what's on your bench?

    Quote Originally Posted by Paul Statman View Post
    That's beautiful, Dave. Too good-looking to be a 'Frau Bluecher', and too symmetrical for 'Eyegor'...
    Although...there does seem to be a pronounced spinal process showing.

    It is a fine looking mandolin.

  4. #1653
    rock in rôle Paul Statman's Avatar
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    Default Re: Post a picture of what's on your bench?

    Quote Originally Posted by Dave Cohen View Post
    Here's the photo of the 2nd CF shell. You can see that there is a CF stiffener in the center of the neck shaft, and that some excess was cut off both ends of the other one.
    Dave, have you considered using the new generation of Rubner tuners? I have found them to be greatly superior to their previous marque.

  5. #1654
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    Default Re: Post a picture of what's on your bench?

    The tuners on this mandolin are Rubners, bought recently. Luxury nickel w/ ebony buttons, which is the combination I like. They were on sale. I haven't paid attention to newer vs older. What I would really like from Rubner and/or any other tuner manufacturer would be significantly lower tuner mass. And that is especially true when I am making necks tha are both so much lighter and so much stiffer than conventional necks. Heavy tuners don't negate the stiffness advantage of a CF/composite neck, but they do partially detract from the lower mass advantage.

    I also have some concern about the Rubner "Moldflon" bearing surfaces on the worms. The "Moldflon, is presumably teflon, aka PTFE. PTFE is a PFAS (Per- or Poly Fluoro Alkyl Substance), dubbed "forever substances". It's not a huge concern in the case of bearing surfaces, due to the small total amount of PTFE on a set of tuner worms. In non-stick cook pans, the PTFE used gives rise to PFOA (perfluoro octanoic acid) and PFOS (perfluoro octane sulfonic acid). Those two, along with other micro plastics, are showing up in water, in soil, and even in the air. So the main concern with teflon coated tuner worms is end-of-life disposal. I asked the Rubner guy one time if there were any concerns about wear of the moldflon bearing surfaces, and he was quick to assert that they are long-wearing. I guess time will tell.
    Last edited by Dave Cohen; May-28-2023 at 4:43pm.

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  7. #1655
    Registered User PT66's Avatar
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    Default Re: Post a picture of what's on your bench?

    Dave Cohen, why aluminum bolt and barrel nut? Weight reduction? I have been using basically the same neck attachment method for the last few years but with steel bolt and nut. Works very well.
    Dave Schneider

  8. #1656
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    Default Re: Post a picture of what's on your bench?

    I'm sure your steel bolt and barrel nut works very well. However, the aluminum version also "works very well". Aluminum has a density of ~2.70 g/cm3, whereas iron has a density of ~7.88 g/cm3. Steel (mostly iron) thus has almost 3x as much mass per unit volume as does aluminum. So if I am going to the trouble to make a composite neck that is both so much stiffer and so much lighter than a conventional wood neck, why would I then add back ~3x as much mass with a steel bolt and steel barrel nut? Btw, I have used the aluminum bolt and barrel nut combination in some guitars and a couple of archtop guitars and an archtop guitar shaped liuto (i.e., a 5-course mandocello). I used two bolts and barrel nuts apiece in those larger instruments. No failures so far.

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  10. #1657
    Registered User PT66's Avatar
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    Default Re: Post a picture of what's on your bench?

    I wasn’t questioning your ability to build reliable instruments. As a retired journeyman machinist I am aware of the weight difference between aluminum and steel. I am also aware that there is plenty of thread engagement to create a secure joint. Just confirming that it is the weight that influenced your decision.
    Dave Schneider

  11. #1658
    Registered User Timbofood's Avatar
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    Default Re: Post a picture of what's on your bench?

    These came off this week!Click image for larger version. 

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    Timothy F. Lewis
    "If brains was lard, that boy couldn't grease a very big skillet" J.D. Clampett

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  13. #1659
    Registered User Charles E.'s Avatar
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    Default Re: Post a picture of what's on your bench?

    Well since we have strayed from mandolins, here is the current canoe at the Heritage Boatworks at the St Augustine Lighthouse...

    A "Bob's Special", 15 ft tandem canoe with white cedar and mahogany (so far).
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    Last edited by Charles E.; Jun-01-2023 at 12:29pm.
    Charley

    A bunch of stuff with four strings

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  15. #1660
    Registered User Timbofood's Avatar
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    Default Re: Post a picture of what's on your bench?

    I can take a thread off course faster that a jackrabbit can make love!
    Timothy F. Lewis
    "If brains was lard, that boy couldn't grease a very big skillet" J.D. Clampett

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  17. #1661
    Jo Dusepo, luthier Dusepo's Avatar
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    Default Re: Post a picture of what's on your bench?

    Recently completed this colascione and medieval lute:



    I am a luthier specialising in historical and world stringed instruments. You can see more info at my website.

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  19. #1662
    Registered User TheMandoKit's Avatar
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    Default Re: Post a picture of what's on your bench?

    Quote Originally Posted by Dusepo View Post
    Recently completed this colascione and medieval lute:

    Beautiful work, as usual. I am really loving the rosette on the lute!
    Kit
    Guitars, Mandos, Violins, Dulcimers, Cats

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    Dusepo 

  21. #1663
    Registered User PT66's Avatar
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    Default Re: Post a picture of what's on your bench?

    Jo, you do fascinating work. I would love to visit your shop. Unfortunately that is not likely. Keep up the great work.
    Dave Schneider

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  23. #1664
    rock in rôle Paul Statman's Avatar
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    Default Re: Post a picture of what's on your bench?

    Quote Originally Posted by Dusepo View Post
    Recently completed this colascione and medieval lute:
    Beautiful work.

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  25. #1665
    Jo Dusepo, luthier Dusepo's Avatar
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    Default Re: Post a picture of what's on your bench?

    Another one completed, a baroque mandolin:

    I am a luthier specialising in historical and world stringed instruments. You can see more info at my website.

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  27. #1666

    Default Re: Post a picture of what's on your bench?

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    About finished with this one!

  28. #1667
    Registered User Steve Sorensen's Avatar
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    Default Re: Post a picture of what's on your bench?

    Sorensen VX #110 Varnished

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    Steve
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  29. #1668

    Default Re: Post a picture of what's on your bench?

    Quote Originally Posted by Steve Sorensen View Post
    Sorensen VX #110 Varnished

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    Steve
    Fantastic work as always from you Steve! I love that bubble back. I'm curious, do you have to leave the back a little thicker because it's not as stiff? Keep up the great work!

  30. #1669
    Registered User Steve Sorensen's Avatar
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    Default Re: Post a picture of what's on your bench?

    Berto,

    Ends up being a little thicker in the recurve to adjust flexibility and in the center to adjust for mass.

    Steve
    Steve Sorensen
    Sorensen Mandolin & Guitar Co.
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  31. #1670
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    Default Re: Post a picture of what's on your bench?

    An update and family photo. The first photo shows the newly completed Fronkie jr in the foreground and Fronkenshteen in the background. Second photo is of the backs of the two instruments. Third photo shows the side detail of Fronkie jr (in the foreground), in particular the shading from golden brown to red to dark mission brown to black where the side meets the CF composite neck. Fourth photo shows a closeup of the neck/heel area in Fronkie jr. You can see that all of the fretboard extension support floats above the top plate, touching it only at the very end of the mortise. The fifth photo shows another CF composite shell neck, this one just made, for a future C# mandolin. Sixth photo is another view of that neck, showing how the fretboard extension support is let into a rabbet in the neck heel block, then the joint is stiffened with two inlaid pultruded CF rods, each covered by a layer of maple.

    Fronkenshteen has an Engelmann spruce top plate, with European curly maple back & sides and the CF composite shell neck. And of course, all the screws that make it Fronkenshteen. Fronkie jr has a redwood top plate w/ bigleaf maple back & sides and the CF composite neck. Whatever it is that I did to the plates, Fronkie jr sounds great. Plenty of chop if one wants that, and single notes have good pop. Which means that the mandolin is doing its job at pumping air. Good bandwidth, meaning that there is balance and there are no weak notes.
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  33. #1671
    Innocent Bystander JeffD's Avatar
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    Default Re: Post a picture of what's on your bench?

    That Baroque mandolin sure looks inviting. For information, I assume the tuners are friction pegs. That is what appears to me in the picture. No problem with that, (I dabble at fiddle) just want to know.
    A talent for trivializin' the momentous and complicatin' the obvious.

    The entire staff
    funny....

  34. #1672
    Registered User j. condino's Avatar
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    Default Re: Post a picture of what's on your bench?

    I've got a new batch of mandolins in progress, but this character has been taking up most of my week. I'll put it politely that everyone could hear me this weekend!
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  36. #1673
    Registered User Sue Rieter's Avatar
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    Default Re: Post a picture of what's on your bench?

    It's so cool
    "To be obsessed with the destination is to remove the focus from where you are." Philip Toshio Sudo, Zen Guitar

  37. #1674

    Default Re: Post a picture of what's on your bench?

    Quote Originally Posted by j. condino View Post
    I've got a new batch of mandolins in progress, but this character has been taking up most of my week. I'll put it politely that everyone could hear me this weekend!
    No doubt about that! And on a sunny day I suppose you offer welding glasses to the audience?
    Good thing that has convex surfaces- cuz otherwise you would have a solar-powered mobile mandolin immolation device.
    Did you finish the rest of the bass where you showed us a reddish (anodized?) peghead?

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  39. #1675
    Jo Dusepo, luthier Dusepo's Avatar
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    Default Re: Post a picture of what's on your bench?

    I am a luthier specialising in historical and world stringed instruments. You can see more info at my website.

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