How to SIMPLY figure this out

[Nvreloader]

OK Guys and Gals

This for you smarter/brainier types here, (yes, we have several),

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

You only have this information about a pellet, to figure the missing/wanted info out.
.20 caliber,
Weight = 14.10 gr
Head Dia = .199"      
O/S skirt Dia= .202"
I/S skirt Depth = .086"
I/S waist Dia = .125"
O/S waist Dia = 0.142
O/S skirt Length = .150"
Bearing Length = .213"
Overall length = .296"
Skirt Thickness .023" to .024" (average)

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                                    


   

[Nvreloader]

OK Guys
I found an error, the caliber listed should be 20 caliber,
NOT 22 caliber...

I do not have a method to edit the original post, for some reason...

[JPSAXNC]

If your trying to figure out the skirt angle of an existing pellet, you might be able to do it using a protractor and magnifying glass like an optical comparator?

[ballisticboy]

Answer on AGN.

[avator]

OK Guys
I found an error, the caliber listed should be 20 caliber,
NOT 22 caliber...

I do not have a method to edit the original post, for some reason...

I fixed the typo.

[Nvreloader]

Thanks Bill

This blasted 20 cal angles is driving me crazy.

[JPSAXNC]

You would just be solving for a right triangle, from the edge of the waist down to the base of the skirt. hth

[JPSAXNC]

Google calculator says 75.6 degrees  Or it's 14.3 degrees which makes more sense.

[avator]

I would think the latter.

[Nvreloader]

Thanks Guys,
Using the calculator provided, I came up with these figures,

Inside skirt angle (degree)* = 12.14*  @ .023" skirt thickness.
Outside skirt angle (degree)* = 11.31*
I subtracted the skirt thickness from the O/S Waist Dia to get the O/S cone diameter ??

The reason for this math is,
I can swing the lathe compound to whatever degree to cut the taper
for the inside skirt cone pin for resizing/uni-forming the pellets skirts etc.

JPSANC
I never had that type of math when I was in school, a long long time ago...lol
It's hands on learning now...
Tia

[splitbeing]

Don, you're light years ahead of what I can figure from all of this.

Still interesting to follow though,

[TorqueMaster]

To me, this number is ambiguous:
O/S skirt Length = .150"

Is that the skirt Height (along a vertical line) or measured along the angle of the skirt.

If it's the skirt height, I get 11.31 degrees using your web calculator.
If it's the skirt length, I get ~11.54

If the skirt thickness is uniform, the inside angle should equal the outside angle.

[Nvreloader]

SB

All I can say it's a school of hard knocks for me, and I am TOO OLD to go back to school
with all those whopper snappers around.
Tia,

[Nvreloader]

TM
"To me, this number is ambiguous:
O/S skirt Length = .150"
Is that the skirt Height (along a vertical line) or measured along the angle of the skirt.
If it's the skirt height, I get 11.31 degrees using your web calculator.
If it's the skirt length, I get ~11.54

If the skirt thickness is uniform, the inside angle should equal the outside angle."


I am not sure which way to measure the I/S cone values,
I have been using the straight depth measurements 90* from the end of the skirt to Jct of the waist.

I know that the wall thickness of the skirts is NOT UNIFORM in thickness,
as I have sliced several different pellets Brands in half, and you can see the tapering wall thickness.

The H&N have a funny type of tapering inside cone, I had to make a special tool with a .060" diameter rod to reach the total depth length.
My dial calipers/venire even with the smallest end (.065" square end) would not reach all the way, and I have the smallest 4" dial calipers/
venire,  could find, even with the minimum .0002" reading, I prefer .1000" scale readings.

I have been measuring the O/S skirt length on the outside slope angle
to where the Jct of the waist and skirt angle meet and the inside straight vertical to
skirt end.

IMHO, I don't think the minor differences are really causing and problems.

I have setup an XL program to keep track of all 4 calibers, as an example,
the 20 cal Slope degrees of the Outside cone angles run from 08.47* min and 18.43* max (degrees) for 90 samples, and the Inside cones angles run from 11.08* min to 24.44* max (degrees).

Those .117 cal pellets are a B(*&%^$%h to hold and measure with my shaking hands, it took me several days to get all the 192 samples done. Yesterday I had a plastic box (Computer) malfunction and lost over half of the info I had finished.           and the only caliber I did not have a back up saved for.

Thank you,
Your thoughts and suggestions.

[Madd Hatter]

WHY? OH Why are you trying to figure this stuff out?? Now I have a headache!!!


Lol, joking. You want some real fun try learning machine math to calculate the tool path for a CNC mill. I've never had trig and that is the bases for the calculation. It was a 2 week course. I don't remember any of it.🤬🤬🤬

[Nvreloader]

MH
I have a DRO on my mini mill for over 5+ yrs, and I still have read the manual to run it, this new electronic work is getting almost un useable for me, I like the simpler stuff.  lol
Tia

[Madd Hatter]

Well it would've helped if I would have had a chance to use it. It was at Boeing and our manager thought it would be useful for the CNC controlled stitching machine op to learn it. I'm not talking about a singer sowing machine but a 8 million dollar 70 feet long 12 feet wide and 25 feet tall 4 head 38 axis stitching machine. We were stitching airliner carbon fiber wing panels. Upper and lower panels that would be joined together like a normal aluminum wing except this one didn't take any shims or moddings. It was a project for NASA to study the possibility of replacing aluminum wings with stitched resin film infusion wings. I'll post some pictures of the monster after I get home.