mhamilt/harpsichord-model-data

Sensor Sketches and CAD data releated to electronically augmented harpsichord model

Harpsichord Model Data

Measurements and 3D models related to Haptic Harpsichord project

• Harpsichord Model Data
  • 3-Key Model Keyboard
    • Jack Info
      • Dimensions
        • Angled Sensor
        • Tongue
          • Tongue Slot
        • Quill
        • Spring
        • Damper
        • Pivot
      • Spacings
      • Gradient Surface
  • Full Scale Keyboard
    • Jack
      • Dimensions
      • Jack Pitch
      • Travel
      • Cavity
  • Jack Fabrication
    • Laser cutting
    • CNC
  • Paper Structure
  • Paper Ideas
  • Model

3-Key Model Keyboard

Jack Info

Dimensions

height:   93.00mm
depth :   12.35mml
width :    4.30mm

movement: ~7.22mm

Angled Sensor

offsetF:   20.00mm
offsetB:   26.00mm

Tongue

heightf: 29.40mm
heightb: 24.18mm

Angle :   61.1134º {180*atan(5.22/2.88)/pi}
depth :   4.24mm
width :   2.88mm
to quill ctr: 9.34mm
pivot hol 19.20mm

Tongue Slot

HeightF: 29.50mm
HeightB: 28.00mm 
Depth  :  4.58mm
Width  :  3.04mm

Quill

height: 2.30mm
width : 0.70mm
depth : 9.22mm

Spring

height: 13.84mm
width :  1.20mm

Damper

slot:         1.00mm
width (max): 10.00mm
height(max): 10.00mm

Pivot

from top: 19.50mm
diameter:  0.50mm

Spacings

soundboard to jack lip:    5.0000mm
Jack Pitch:               14.4875mm
Block Depth:              74.0000mm
Depth to first Jack:     ~63.4000mm
Depth to 1st Jack Centre:~65.7000mm
Jack 1:                    8.4000mm
Jack 2:                   23.4000mm
Jack 3:                   38.4000mm
Header Pins
Board Dim: 85mm x 18mm

• Distance from back jacks to the centre block separating keys and cavity: 18.00mm
• Space from the support strut for the jack block to the backplane: 51.00mm
  • height of that are 14.00mm
  • reducing to 10.00mm under strut
• base of jack to start of slot (i.e. how much sticker is exposed): 21.00mm

Gradient Surface

width:    4.6mm
height:  93.0mm

Full Scale Keyboard

Top view of the 49-key keyboard

The full scale version of the interface has 49 keys and 2 jack rows. The jacks are generally around 4.65 mm.

Jack

Dimensions

height:   93.50mm
depth:    13.05mm
width:     4.50mm
movement: ~8.50mm

Jack height exposed in cavity   : 39.0mm
Jack height exposed on key press: 30.9mm

Jack Pitch

There is not much variation in the pitch of the jacks. On average the centre-to-centre is 14.02 mm. Likely error between jacks would compound across the full length. This should be compensated for by the separate pcbs which have groups of 7 sensors.

Space between the jacks is 9.75 mm, meaning central pcbs will have to have less than half this distance (4.875mm) in order to slot together.

Travel

Front jacks have a travel of about ~7.2mm and back jacks 7.5mm between key release and full key press.

Cavity

Key to Roof (pressed): 28.00mm
Key to Roof (release): 39.00mm
Key Locating Slot to Roof: 28.50mm

Area to be removed:
10mm x 15mm
Including leather

Jack Fabrication

Laser cutting

After cutting and sanding back a charred edge, the 3-Key Jacks were ~11.5mm which is about a loss of ~1mm in total or 0.5mm. Vectors for jacks should compensated by an additional 0.5mm. The damper groove should be a simple vector and not a rectangular path.

CNC

Paper Structure

• Intro: aims and constraints
  • track jacks of a harpsichord for interacting with digital instrument
• Current work done and extraction from those
  • TODO: Find example papers
    • inspiration taken
    • concepts developed
• What happened / what was done
  • algorithm
  • calibration
• Measure success of what was done
• What happens next?

Paper Ideas

• Jack tracking of harpsichord
• effects of mechanical noise
• player interaction experience with and without haptics

Model

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endsolid

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