mosher wrote:your thought on the physics of needles is a good attempt but not really correct in some respects.
i'm not really trying to get into physics or anything crazy like that... i am speaking common sense here... putting a cut in material weakens it more than not, and can give the thread/floss an avenue to continue tearing the cut which after awhile "could" result in a popped seam. i'm not saying don't use glovers needles, they have their place... i just prefer not to use them on thin material...
mosher wrote:Yes, a glovers needle cuts a hole, but it does not directly weaken the structure of the bag much.
but it does weaken the bag more than using a standard needle that doesn't put cuts in the material.
mosher wrote:The real advantage of cutting a hole over plowing a rounded needle into the material is that when you use a normal needle it creates a stress concentration around your thread. The displaced material from a round needle presses against the thread making the bag feel stiffer too.
the advantage of using a glovers needle is it makes it SOO much easier pushing it through the material... the small amount of displaced material from using a regular needle is tiny and not enough to make a difference in the stiffness of a bag.
mosher wrote:If you place the needle correctly and make sure that there are no spots where the holes are under 1.5 mm from any edge then you likely won't have any problems.
true.
the fact of the matter is that Vindicator was not having any problems using standard needles... then when he switched to glovers needles using the same style of stitching he started to have popped panels... it just goes to show that glovers needles can cause failure if the right precautions are not taken... example: leaving more material so if a tear does start, it doesn't rip all the way through.