Stave Drum Calculator (Updated)2

STAVE CAL Instructions In yellow boxes below: 1. Input Shell Diameter (inches) 2. Input Number of Staves Required 3. Input Depth of Shell (inches) 4. Input Board Thickness (inches) 5. Input Board Width (inches)

In green boxes below: 1. Input Price per Board Foot (Do not include currency  symbols. Numbers only 

Shell Diameter (inches)

Number of Staves Required

Depth of Shell (inches)

Board Thickness (inches)

Board Width (inches)

14

20

5.00

0.750

5.75

Stave angle A (degrees)

X (inches)

Y (inches)

Z (inches)

X (mm)

Y (mm)

9.00 .00000 0000

1.97 .974985 985

2.23 .23718 7180

0.8 0.827717

50.164 .1646 622

56.8 56.82 24378 378

Below is an example

ULATOR In blue boxes below: 1. Answer True or False if the Material Being used is High Quality and Clear of Defects (The above step adds a percentage based waste  factor to the rough total of board feet resulting in 

Price per Board Foot

Material is Total Cost for High Quality Shell (Based and Clear of on Final Total Defects? (True of Board Feet) or False

15.99

27.53

Z (mm)

Number of Complete Staves per Board Width

21.024021

2

TRUE

Final Total of Board Feet Required for Shell 1.722005

Total Linear Total Length of Length Stave Required Required per inches Board Width 100.00

50.00

Rough Total of Board Feet Required for Shell 1.497396

SHELL SPECIFICATIONS External Diameter Shell Thickness

14.125000 0.750000

Internal diameter External radius Internal radius

12.625000 7.062500 6.312500

Total Degrees Stave No. Each Stave Joint (total degrees) Each Stave Cut/Bevel Angle (degrees)

360 20 18.000000 9.000000

FINDING X Sum of angles in Triangle (degrees) Stave angle (degrees) Remaining two equal angles (degrees)

180 18.000000 81.000000

PI sin (stave angle) sin (equal angle) X FINDING Y Sum of angles in Triangle (degrees) Stave angle (degrees) Remaining two equal angles (degrees) PI sin (stave angle) sin (equal angle) Squaring the side gives Squaring the side gives

3.14159265358979 0.314159 1.413717

0.309017 0.987688

1.974985 inches

180 90.000000 81.000000 3.14159265358979 1.570796 1.413717

1.000000 0.987688

7.062500 7.150535

7.062500 7.150535

Difference in squaring sides Square root of difference Y

2.237180 inches

FINDING Z Internal radius

6.312500

Internal radius squared

6.312500

6.312500

Half of the value of above X squared

0.987493

0.987493

39.847656

0.975142

Difference in squaring sides Square root of difference

6.234783

External radius

7.062500

Difference in External radius and square root

0.827717

Z

0.827717 inches

Finding Total Board Feet Required Board Width (inches)

5.750000

Number of staves per board width Number of complete staves per board width

2.466826 2

Number of shell staves divided by staves per board width Total required linear inches

10 50.00

Rough total board feet required for shell

1.497396

Waste factor for good clear material Waste factor for low quality material

1.150000 1.300000

Final board feet total for clear material Final board feet total for low quality material

1.722005 1.946615

mm to inches

25.4

6.312500 1.974985

1.950670 1.950670

7.062500 7.150535

7.062500 7.062500

49.878906 51.130150 1.251244 1.118590 2.237180

39.847656 0.975142 38.872515