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View Full Version : Challenge for smart guys. Need a Script with math. Timing.


gunplumber
June 24, 2017, 12:43
So I frequently use calculators I find on-line for converting mm to inch, Celsius to Fahrenheit, Newton meters to foot pounds, etc.

They are simple boxes where one enters one measurement to obtain another.

I can do it in Excel (with a "zero" starting point), but I need something I can plug onto my website.

I want one for calculating breeching washer size, and another for calculating flash hider timing washer size.

Flash hider

L1A1 flash suppressor positioning washer
Sizes are +/- .0005"

9/16x24 =
24 threads per inch =
.041666666 per thread =
.00011574074" per degree


1 = .1505"
2 = .1540"
3 = .1575"
4 = .1610"
5 = .1645"
6 = .1680"
7 = .1715"
8 = .1750"
9 = .1785"
10 = .1820"
11 = .1855"
12 = .1890"

Breeching Washer
L1A1 breeching washer
specify size. Sizes are +/- .0005".

1"x16 =
16 threads per inch =
0.0625" per thread =
0.00017123287" per degree

1 = .0565"
2 = .0570"
3 = .0575"
4 = .0580"
5 = .0585"
6 = .0590"
7 = .0595"
8 = .0600"
9 = .0605"
10 = .0610"

And related to breeching washer, FAL shims for overtimed barrels.

FAL Over-timed

1 degree = .00017" (see above)
.002"
.004"
.006"
.008"
.010"
.012"
.015"
.020"
.025"

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Now the flash hider, I think can be screwed all the way in for the zero mark. "When I screw my flash hider all the way in (hand tight) the bayonet lug is at X degrees when viewed from the front."

X degrees plus Y timing washer will put the bayonet lug 15 (ideal) to 30 (max) degrees short of bottom dead center.

What I do is install a #6 and then add or subtract in my head - but I have plenty of sizes, and if I get one that is between sizes (and I don't have an "A" size - A sizes are halfway between a number and the next higher number, and came out later in production because 30 degrees can sometimes deform the muzzle), I can pick the next one too large and put it on the surface grinder. I need something for people to order the right size.

---------------

Now breeching is going to be tougher as the chamber face will bottom out, giving a false reading. I do the same - start with a 1 and then add as needed. This is made more difficult because different barrel and receiver combinations will have different crush (elasticity?) at the same torque.

I think this would be a valuable resource if it can be made to work. Factory screws on a numbered gauge.

SAFN49
June 24, 2017, 18:51
I generally don't math on weekends but the Inch breech washers look like a problem.

+/- .0005" when there is only 0.0005" between the sizes, which 0.0005" = +/- 3 degrees.

So figure +/- 6 degrees either way. You would have to sell a minimum of 5 sizes at once to get close. Talk about stacking tolerances.

12v71
June 24, 2017, 19:45
I generally don't math on weekends but the Inch breech washers look like a problem.

+/- .0005" when there is only 0.0005" between the sizes, which 0.0005" = +/- 3 degrees.

So figure +/- 6 degrees either way. You would have to sell a minimum of 5 sizes at once to get close. Talk about stacking tolerances.

No, just crank it hard 3 times and measure the gap when you back it off to 12 o'clock and add .005" and you should be close.

SAFN49
June 24, 2017, 19:58
No, just crank it hard 3 times and measure the gap when you back it off to 12 o'clock and add .005" and you should be close.

To write a program, code, for a calculator to take into account 0.0005" +/- 0.0005" you need to be able to measure down to 0.0000X", the next decimal place.

I think you may have dropped a zero or 2.

308/223shooter
June 24, 2017, 21:38
:shades: