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"

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

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.

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"

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

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.