Jag BrushTM Is Less Likely Than Standard Jag or Loop To Become Stuck, Part III: Effect of Bristle Flex
Los Angeles, CA — the flexibility of Jag BrushTM bristles creates a dynamic gap clearance, and, in turn, a Jag BrushTM and patch combo is less likely, than a standard jag and patch combo, to become stuck in a bore.
Diameters of ribs of a solid jag are sized by its designer to push a specific patch thickness or a precise number of pleated patch layers. Because the ribs are inflexible, there is a narrow tolerance range for correct numbers, and when a jag is used with thickness or pleat number straying from the narrow range, the combo is likely to become stuck in the bore.
Also being rigid, a standard metal or plastic loop has a narrow range for correct patch thickness or pleat number. Its eye has fixed gap clearances, the smaller one at loop profile and the larger at loop face. Like a standard jag, a loop and patch combo become stuck in a bore when a patch too large or too thick is used.
On the other hand, the flexible bristles of a Jag BrushTM give it a broader tolerance range for patch thickness or pleat number. It can flex to accommodate many pleats at bore entry or inside the bore without becoming stuck. Evidence is the fact that a Jag BrushTM has a greater upper limit for the amount of single-patch 5-layer it can accommodate.
The greater limit is verified by the fact that a Jag BrushTM pushes even more than 5- layer pleats of thick patch through a bore. Solid standard jags and loops cannot do that. While not recommended, a carefully used Jag BrushTM can push two thick patches doubled up down a bore. The doubled patches form 6-layer pleats, and the number 6 is known by the fact 6 is twice each patch’s 3-layer pleating.
The Table that follows shows gaps created by standard jags. It shows that typical gaps are 1 to 2.5 times the thickness of a thick cotton patch. Because cotton flannel compresses, we see that standard jags, at their largest rib location, use or require 3- layers of pleating. 2-layers of pleating is not available there since 2-layer pleating does not occur near the top of a jag, being the location where only odd numbers of pleats occur and where the largest rib is. Keeping in the mind the rigidity of their structure and the fact that cotton compresses only so much, the range "1 to 2.5" shows that standard jags at their largest rib location have trouble pushing through a 5-layer pleating of thick cotton patch since 5 is well above the upper limit of 2.5.
Shane Smith +1 310-463-7811 (mobile) RigelProducts@yahoo.com