SEL formula

[JYALBERT]

"If you are trying to get to 'surgical' precision you should think of a different hobby."
Exactly. Have you noticed there is no cross slide, compound, or leadscrew on a wood lathe? There's just no need for that level of precision. Even if you turned a piece to that level, it's going to change and move next spring anyway.

I don't know what a cross slide, compound, or leadscrew is, I'm just curious about the trig and geometry of a wedge as it relates to the ring. I am not seeking any precision, I am just trying to understand the SP calculations for SEL and board length, not to question the software or use more precision in my creating rings.

 

[mfisher]

I don't know what a cross slide, compound, or leadscrew is, I'm just curious about the trig and geometry of a wedge as it relates to the ring. I am not seeking any precision, I am just trying to understand the SP calculations for SEL and board length, not to question the software or use more precision in my creating rings.

Looking through the thread I would hope you found the answer to your question regarding SEL and board length.

 

[Doug Drury]

I recognize that most segmenters will not have an issue with this, but with the open segment/sacrificial segment work I'm doing (see pic below), I'm starting to have an issue with the SEL calculation only going to 2 decimal places. Is there a way to increase the number of decimal places?

 

[mfisher]

I recognize that most segmenters will not have an issue with this, but with the open segment/sacrificial segment work I'm doing (see pic below), I'm starting to have an issue with the SEL calculation only going to 2 decimal places. Is there a way to increase the number of decimal places?
View attachment 5256

I would suggest making a spreadsheet (excel) to do the calculations using the formula
SEL = tan(miter angle) * radius * 2

You can set whatever decimal level you need.


I am not aware of how to adjust the number of decimals displayed in the summary sheet in WTP or SP.

 

[Ken Sherwin]

My SP displays SEL to 3 decimal places.

 

[Doug Drury]

I would suggest making a spreadsheet (excel) to do the calculations using the formula
SEL = tan(miter angle) * radius * 2

You can set whatever decimal level you need.


I am not aware of how to adjust the number of decimals displayed in the summary sheet in WTP or SP.

I already have excel spreadsheets to calculate the formula. I was just hoping to save a couple of steps in the design part of the build. With the calc already being done in WTP, I was hoping it would be a fairly easy task to increase the number of decimal places. I even tried changing the increments to 1/64", but on the export to excel it converts back to 2 decimal places. I think it did the same thing when I tried printing it.