Date: July 18, 2011

Jag BrushTM Less Likely than Standard Jags to Become Stuck, Part VIII: Effect of
Length

Los Angeles, CA — a Jag BrushTM axial length is long enough to press a patch
along its entire radius, while lengths of many brands of standard solid ribbed jags
are not long enough to do it.  At the location where a patch's extremity reaches over
the base of a short standard jag, a jag-patch combo can become stuck in the bore.

Any Jag BrushTM is so long that a patch extremity, aka corner, never reaches over the
connector.  However, the shortness of some popular brands of solid jags means
large patches for the same caliber stretch beyond the jag’s ribs or neck, and they
reach far enough to wrap around the jag base and the rod’s tip.  For small caliber, 30
and below, patch fabric wrapped around the jag base or rod’s tip can prevent the
combo from entering or going down the bore.  The increased likelihood to become
stuck is due to the small gap between jag-base diameter or rod-tip diameter and the
bore diameter.  See
lengths of jags and jag brushes.

The table that follows shows how a jag base sometimes has a diameter larger than
the largest ribs of the same jag.  The largest ribs are the first ribs after the jag’s tip.  
The table shows the gap between base and bore wall can be less than a 0.016 inch
patch thickness.  The base of a jag is solid plastic or metal, which means a patch
caught in the narrow gap makes the combo stuck.



























































The table shows why large patches get stuck at the jag-base-to-bore gap for short
jags.  That gap can be smaller than the thickness of 1 or 2 layers of patch.  1 or 2-
layer thicknesses occur near the extremity of a pleating patch, where the extremity is
located beyond, at, or near the jag base.  A summary is as follows:

17 cal — gaps between jag base and bore wall are at less than 1 times the patch
thickness of a 0.016-inch patch, and, in fact, one measurement was far less than 1
being at 0.25.  Common brands are at 0.47 to 0.53 times.  Such small gaps created
by jag base are not sufficient clearly when they are far less than minimum gaps put
into place by jag designers.  That is, 0.47 to 0.53 times is far less than the 1 to 1.3
minimum gaps designed for the first ribs where a patch is supposed to wrap.

22 cal — while the first ribs provide minimum gaps of 1 to 1.75 times patch
thickness, their bases create gaps below the minimum at only 0.47 to 0.75 times
patch thickness.  Long patches extending over their jag bases are likely to make
combos stuck in the bore.

243 to 30 cal — jag bases have gaps on par with gaps left by first ribs, and that
equality makes it appear bases are not too large.  But the jag base gaps are 1 to 1.8
times patch thicknesses which is a value less than 2.  Designers do not expect
patches to wrap around jag bases.  So having jag base gaps at values less than 2
may cause too much unexpected squeezing.  That is, 2-layer pleating where patch
extremities wrap around bases may increase squeezing by an amount that adds too
much friction to that is built up already by expected 3-layers squeezing into gaps
created by all ribs.

In conclusion, since a Jag BrushTM is longer than patch radii and standard jags, a
Jag BrushTM does not have the problem of patches wrapping around its connector.  
As a consequence, a Jag BrushTM and large patch caliber-matched combo does not
become stuck in a bore like a short standard jag and large patch combo.


PRESS CONTACTS                                                                                 

Shane Smith
+1  310-463-7811 (mobile)
RigelProducts@yahoo.com


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Press Release
Caliber
Jag, Largest Rib
Diameter

(Inches)
Min Gap
Range for
Jags to Bore
Wall

(Inches)
Gap/Thickness
Ratio: min jag
gap to 0.016"
patch
thickness
Jag Base
Diameter

(Inches)
Min Gap of Jag
Base to Bore
Wall

(Inches)
Gap/Thickness

Ratio jag base
gap to 0.016"
patch
thickness
17
0.130 to 0.140
0.016 to 0.021
1.00 to 1.31
0.125 to 0.164
0.004 to 0.024
0.25 to 1.5
17
0.130 to 0.140
0.016 to 0.021
1.00 to 1.31
Many brands at
0.155 to 0.157
0.008 to 0.009
0.47 to 0.53
20
0.167 to 0.168
0.016
1.00
0.166 to 0.168
0.016 to 0.17
1.00 to 1.06
22
0.165 to 0.196
0.016 to 0.028
1.00 to 1.75
0.179 to 0.205
0.008 to 0.021
0.47 to 1.28
22
0.165 to 0.196
0.016 to 0.028
1.00 to 1.75
Many brands at
0.196 to 0.205
0.008 to 0.012
0.47 to 0.75
6 mm
0.172 to 0.205
0.016 to 0.032
1.00 to 2.00
0.200 to 0.206
0.015 to 0.018
0.94 to 1.13
243
0.172 to 0.205
0.019 to 0.036
1.19 to 2.25
0.200 to 0.206
0.019 to 0.022
1.16 to 1.34
25
0.197 to 0.217
0.016 to 0.018
1.00 to 1.13
0.199 to 0.203
0.024 to 0.026
1.47 to 1.59
6.5
mm
0.197 to 0.217
0.015 to 0.029
0.94 to 1.81
0.199 to 0.203
0.026 to 0.028
1.65 to 1.78
270
0.197 to 0.230
0.021 to 0.037
1.31 to 2.31
0.203 to 0.251
0.010 to 0.034
0.59 to 2.09
7 mm
0.197 to 0.230
0.023 to 0.039
1.44 to 2.44
0.203 to 0.241
0.017 to 0.036
1.08 to 2.27
30
0.249 to 0.255
0.028 to 0.030
1.75 to 1.88
0.225 to 0.250
0.029 to 0.042
1.81 to 2.59
338
0.273 to 0.299
0.032
2.00
0.241 to 0.250
0.044 to 0.049
2.75 to 3.03
35
0.290 to 0.307
0.022 to 0.023
1.38 to 1.44
0.241 to 0.250
0.050 to 0.055
3.13 to 3.41
9 mm
0.290 to 0.307
0.024 to 0.032
1.5 to 2.0
0.241 to 0.250
0.053 to 0.057
3.28 to 3.56
375
0.325 to 0.336
0.020 to 0.025
1.25 to 1.56
0.241 to 0.250
0.063 to 0.067
3.91 to 4.19
416
0.362 to 0.378
0.011 to 0.019
0.69 to 1.19
0.248 to 0.252
0.082 to 0.084
5.13 to 5.25
44
0.365 to 0.393
0.023 to 0.038
1.44 to 2.38
0.245 to 0.376
0.064 to 0.098
4.00 to 6.09
45
0.375 to 0.409
0.024 to 0.038
1.5 to 2.38
0.246 to 0.376
0.037 to 0.102
2.31 to 6.38
50
0.47
0.015
0.94 or less
0.371
0.065
4.03