Tough one. Rolled material formula.

craigwojo9

New Member
Joined
Jul 23, 2013
Messages
11
I need a simple input spreadsheet for figuring material remaining on a roll.

Three inputs needed and one formula created.
Outside Diameter of Rolled Material
Thickness of Material
Diameter of Center Hole
Formula output - Length of Material

I just need the formula figured... do not know where to start.

Here is a link to the calculator I need created.

Cut Smart : LENGTH ON ROLL CALCULATOR

Thank you so much and God bless,
Craig
 

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Maybe a starting point Length of material on roll , Appears quite close to "Calculator"
Code:
Function Lgh(MaxD As Double, MinD As Double, Th As Double) As Double
Dim L As Double, D As Double
D = MinD
 Do Until D >= MaxD
  L = L + D * Application.Pi
  D = D + 2 * Th
 Loop
Lgh = (L - Application.Pi * MinD) / 1000 'Divide by 12 for Feet
End Function
 
Upvote 0
The basic formula is:

Code:
Pi x ((Ouside Radius^2) – (Core Radius^2)) / Caliper = Linear Inches

The .06545 in the shorter formula in Pi divided by 48, which is a constant to change the LI to LF.

Note that the formula assumes the caliper remains constant (usually not the case in a manufacturing process) and there is a tight wrap around the core.
Excel Workbook
ABC
1Unit
2Outer Diameter60Inch
3Outer Diameter of Core4Inch
4Caliper0.014Inch
5
6
7Linear Inches201061.9Inch
8Linear Feet16755.16Feet
9
10Shorter formula for LF16755.2Feet
11
Sheet
 
Upvote 0
The basic formula is:

Code:
Pi x ((Ouside Radius^2) – (Core Radius^2)) / Caliper = Linear Inches

The .06545 in the shorter formula in Pi divided by 48, which is a constant to change the LI to LF.

Note that the formula assumes the caliper remains constant (usually not the case in a manufacturing process) and there is a tight wrap around the core.
Excel Workbook
ABC
1Unit
2Outer Diameter60Inch
3Outer Diameter of Core4Inch
4Caliper0.014Inch
5
6
7Linear Inches201061.9Inch
8Linear Feet16755.16Feet
9
10Shorter formula for LF16755.2Feet
11
Sheet
Thank you! ?
 
Upvote 0

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