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Type: Posts; User: HoGo

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    Re: Measuring the top/back through soundhole.

    From my making I think both wod properties and "architectural ones" are both important though you can only measure some of them on finished instrument (you cannot measure stiffness directly) so we do...
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    Re: Measuring the top/back through soundhole.

    Thanks Fscotte. I thought you made one from scratch.
    I was thinkong about hooking magnetoresistor on audio jack and process the signal via audio input/output of smartphone. WIth some calibration you...
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    Re: Measuring the top/back through soundhole.

    What sensor did you use? I've seen versions with magnetoresistor or Hall effect sensor...

    BTW, I don't remember name but there was another version of magnetic gauge by some guy in OZ if I remember...
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    Re: Measuring the top/back through soundhole.

    Here is my old magnetic "Lipstick gauge" I made some 15-20 years ago. The tip is made of plastic syringe (relatively soft PE, doesn't scratch finish) Body is of transparent lipstick (with strong...
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    Re: Measuring the top/back through soundhole.

    There have been many previous threads about this. Here is one that has some interesting info on home made versions, both electronic and mechanical. I personally converted transparent lipstick into...
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    Re: Plexi for templates

    I also use clear plexiglass templates, 3 or 4 mm thick. I scribe lines with sharp pointed tool and cut roughly with deep throat fret saw with roughest blades I can get - I prefer scroll saw blades...
  7. Re: Is there an ideal Radius Setting for mandolins?

    I had a customer few months ago with his electric guitar with problem with bent strings, when he bent string (he commonly does 2 semitones and in few cases even 3 semitone bends) the string got muted...
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    Re: Machining/Routing Celluloid

    You can also do a test piece out of PVC sheet and see how the cut edges behave, if the chips fly away and leave clean surface it is ok if they remain fused to the edge by the heat you are going too...
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    Re: Valuing a Gibson by Dr Lori

    I hope she doesn't charge for the appraisal by the value of the item...
  10. Thread: 1918 f4

    by HoGo
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    Re: 1918 f4

    Nice catch! Doesn't appear to be refinished. Most refinishes done by Gibson were darker to hide any old stain spots and the binding height looks unaltered.
    Is the bridge original to the mandolin? Is...
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    Re: 1915 Gibson A Pickguard issue

    Good work!
    I believe the holes are angled for clearance for a drill chuck. I think, originally the guard nails were just snug sliding fit into holes and the rust locks them in lace after some time....
  12. Thread: tailpiece cave-in

    by HoGo
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    Re: tailpiece cave-in

    The forces within the whole structure cannot be isolated. It all works as a system. you look at the crossection of mandolin it looks kind of like a bow (shooting) with a tillering stick between bow...
  13. Thread: tailpiece cave-in

    by HoGo
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    Re: tailpiece cave-in

    Just imagine the shape of top and the tension of strings (~150 pounds total) the curve between bridge and tailpiece is S shaped (concave-convex) and the tension is trying to compress the top. In some...
  14. Thread: tailpiece cave-in

    by HoGo
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    Re: tailpiece cave-in

    Thin top mandolins are suspectible to changes in humidity or tuning like you describe. Were the block loose you would see the open separation between back and ribs under the tailpiece.
  15. Thread: staining

    by HoGo
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    Re: staining

    You are going to trim the back to the rim and install binding? that would remove wood with stain and you would have to repair the stain.
    Some top violin makers do start their staining/ sealing...
  16. Thread: Binding laminate

    by HoGo
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    Re: Binding laminate

    ABS can be glued using acetone as well. I've used thin CA for laminating even for celluloid with good results (especially adding thin BW accent to create side-binding a'la Monroe). Acetone can cause...
  17. Thread: tailpiece cave-in

    by HoGo
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    Re: tailpiece cave-in

    Agree with above. Often both come hand in hand. Weak top allows "folding" of the top at recurve and resulting rotation of bottom block will separate it from back (below tailpiece). Much less often...
  18. Re: KC area Luthier suggestions for 3" crack/ top of my Northfiel

    That is commonly called f-hole wing crack and typically is result of pressure on the wing, like someone grabbing mandolin and pressing with thumb right on the wing or in some cases by pulling finger...
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    Re: 1915 Gibson A Pickguard issue

    I would stay away from any oils as they can penetrate deep into wood through tiny cracks in varnish and make ugly splotches. I would prefer dry heat on the board just above pins and gentle mechanical...
  20. Thread: Tone

    by HoGo
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    Re: Tone

    But does it go to 11, huh?
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    Re: I am totally bummed out

    I would just use strong HHG and hold it tightly in alignment till I can count to 50. Then let it rest overnight with the mandolin oriented so that the scroll is above the break (no side leverage by...
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    Re: Alternatives to celluloid binding in Europe

    ALL celluloid (nitrate) since 2004 (not sure about exact year, but that's what I remember) has been produced in China (or perhaps some other asian country as well). The last producer in EU was...
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    Re: Alternatives to celluloid binding in Europe

    That is way too small, perhaps laminating ivoroid to such BWB would work in a pinch (several modern makers add inner thin black layer to make scraping binding easier on dark sunbursts) but for...
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    Re: Alternatives to celluloid binding in Europe

    Maple binding looks classy but is very hard to do properly on F-5 and pretty much rules out the traditional rubbed burst.... Too many complications and exte work would add quite a few $ to price......
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    Sticky: Re: Loar Picture of the Day

    Those backs were likely cut from the same board something like 6" wide 3/4" thick twice as long as mandolin cur in half and glue together. If the figure is consistent along the board some folks may...
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