Paul McClean

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About Paul McClean

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  1. Thanks David. Appreciate the advice. I like the idea of reducing the weight with a target 'note' to aim for keeping the back a semitone above the front at mode 5. I'll let you know how I get on in few days as I only have an hour or two in the evenings
  2. The back plate is currently 120g. Roughly 2.8mm in upper and lower bouts graduated to 4.8mm in the centre so still meat left for final graduation. Mode 1 106hz Mode 2. 163hz Mode. 5. 363hz Thank you..
  3. The bass bar is now fitted and measures 13mm high at the highest point. Weight 84g Thickness is 2.5mm all over except for f holes where it is 2.8mm, soundpost area 3.1mm and edges 3.0mm. Mode 1 76hz Mode 2 154hz Mode 5 341hz Any thoughts on graduating further to reduce the weight? What would be a reasonable thickness to target for wood of this density without going too far? Target for tap tones?
  4. Thank you David. I have been enjoying your videos and they have helped me tremendously!! I don't have a humidity meter to measure the wood but the air humidity is 61. The spruce I am using was bought in 2011 and it was 3-5 years old when I bought it. It has been stored in a cool dry place since then if that helps. I'll thin the centre down to 2.5mm to match the upper and lower bouts, leaving it at 2.8 around the f holes. The f hole fluting is already done. I'll then proceed to fit the bass bar under slight tension and post an update on the weight and modes.
  5. Just a quick update on progress over the past few week as I hope this thread might help someone else down the line. Thickness is ~2.5 mm in bouts and ~2.7 mm in centre. 2.8mm around f holes and 3.1mm in soundpost area. 3.0mm around edges. f holes are cut and weight is now 80g. (Still heavy but we have established that the wood density is 0.48 above) Mode 1 68Hz Mode 2 137Hz Mode 5 291Hz I'm about to fit the bass bar over the weekend which will raise the modes again. Have you guys any advise on whether or not I should try and graduate any more to reduce the
  6. The thickness just inside the border of the top block platform is 3.5mm graduating quickly to 3mm for about 10mm and then into 2.5mm and n the upper bout. Is 3.5mm ok? I assume it is steep die to the arching on the outside. Thanks for the comments...I'm learning a lot
  7. So I have continued to graduate as suggested above. Both the upper and lower bouts are at 2.5 mm graduating into 3mm in the centre and 3.2mm at the sound post area. The weight is now 82g. I calculated the density at 0.48. Chladni patterns are similar to the above (without the chicken ;). Modes are now as follows: Mode 1 79Hz Mode 2 154Hz Mode 5 334 Hz The plate feels flexible but not floppy, firm but not stiff. Should I continue to graduate further and try to reduce weight more or should I cut the f holes and fit the bass bar?? Would love to hear
  8. I calculated the density from a piece I cut off the wedge before splitting and it is 0.48. With my arching height of 15.7 does that influence the final graduations I should be targeting? Although the wood is dense the tap tones seem lower than expected and I don't think the wood is noticeably stiff.
  9. Here's photos of the front and back along with the arching templates I made based on the Titan 1715. I corrected the symmetry. The arching height is ~ 15.7mm including 4mm for the edges.
  10. Thanks for all the tips above. I was working on the lower bout today graduating to an even 2.7mm. However the weight only dropped by 3g down to 86g. The middle bout is still around 3.2mm and the upper bout 2.8mm so I will work on them next but I think at the rate the weight is dropping I will be lucky to get under 80g even if I graduate to 2.4mm in the upper and lower bouts. I have already marked and fluted the f holes so don't need to worry about leaving extra thickness there. I think the plate is 1 mm too long and 1mm too wide as the overhang is closer to 3mm instead of 2.5 but I was le
  11. Really appreciate the feedback so far guys. Looks like I need to drop the weight by at least 19g. Do you think that is achievable ok given I'm currently at 2.9mm in the upper and lower bouts and 3.3mm in the middle? How thin should I target? Also, the edges inside the gluing platform are 3.5mm. It is difficult to thin here without producing a steep concave slope. Any advice on the thickness I should target? The thickness at the purfling is 3.5mm and 4mm at the edge so fluting is quite shallow.
  12. I am currently making my second violin and have graduated the top plate to 2.9mm in the top and bottom bouts and 3.3mm in the centre between the C bouts. The thickness is ~3.5mm just inside the gluing platform all the way around. The overall plate weighs 89g which I believe is high. Attached is a photo of the Chladni patterns of modes 1, 2 & 5 along with the respective frequencies. Mode 5 is currently at 353Hz. My aim is to keep the modes in octaves and for mode 5 of the back plate within a tone of the top mode 5. Question: How should I proceed with graduating the top? Should I