How to figure this...?

OK Guys and Gals

This for you smarter Math types here, (yes, there is several here ),

Can you help me figure this information out, KEEP IT SIMPLE, Please,
I am NO MATH Major, just a student from the school of Hard Knocks ..LoL

Is there a better/simpler way to figure these cone degree angles out?

I need this information, so I can make skirt pins for sizing/uni-forming pellets in the 4 pellet press's, in these 4 calibers, 17, 20, 22, 25 calibers to fit my rifles/pistols, etc.

You have this information from pellet measurements, to figure the missing/needed info out. All these measurements are as accurate as possible, when measuring.
20 caliber,
Weight = 14.10 gr
Head Dia = .199"
O/S skirt Dia= .202"
I/S skirt Dia = .156" = (2x skirt thickness subtracted from O/S skirt Dia)?
O/S waist Dia = 0.140"
I/S waist Dia = .120"
O/S skirt Length = .150"
I/S skirt Depth = .084"
Skirt Thickness .023" to .024" (average)
Bearing Length = .213"
Overall length = .296"

Inside skirt angle (degree)* =
???
? = 12.09*
Outside skirt angle (degree)* =
???
? = 11.67*


Do you need more information, this is what I have been using,
https://www.omnicalculator.com/construction/taper

Skirt Depth = Is from the bottom of the skirt to the top of the inside waist,
that the bolt probe pushes against.
Bearing length = Is from the center of the head diameter band to end of skirt length.
Skirt angle = the degree of the inside and outside skirt cone angles/dimensions.

Thank you, your input is greatly appreciated
Don
 
Last edited:
OK Guys and Gals

This for you smarter Math types here, (yes, there is several here ),

Can you help me figure this information out, KEEP IT SIMPLE, Please,
I am NO MATH Major, just a student from the school of Hard Knocks ..LoL

Is there a better/simpler way to figure these cone degree angles out?

I need this information, so I can make skirt pins for sizing/uni-forming pellets in the 4 pellet press's, in these 4 calibers, 17, 20, 22, 25 calibers to fit my rifles/pistols, etc.

You have this information from pellet measurements, to figure the missing/needed info out. All these measurements are as accurate as possible, when measuring.
20 caliber,
Weight = 14.10 gr
Head Dia = .199"
O/S skirt Dia= .202"
I/S skirt Dia = .156" = (2x skirt thickness subtracted from O/S skirt Dia)?
O/S waist Dia = 0.140"
I/S waist Dia = .120"
O/S skirt Length = .150"
I/S skirt Depth = .084"
Skirt Thickness .023" to .024" (average)
Bearing Length = .213"
Overall length = .296"

Inside skirt angle (degree)* =
???
?
Outside skirt angle (degree)* =
???
?


Do you need more information, this is what I have been using,
https://www.omnicalculator.com/construction/taper

Skirt Depth = Is from the bottom of the skirt to the top of the inside waist,
that the bolt probe pushes against.
Bearing length = Is from the center of the head diameter band to end of skirt length.
Skirt angle = the degree of the inside and outside skirt cone angles/dimensions.

Thank you, your input is greatly appreciated
Don
Honestly, I would just draw it in cad from the numbers you listed and then "measure" the result. Look at the free version of Fusion 360. You could draw it in a sketch and get all your numbers.
 
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