Severe Inconsistencies In Tippmann Boss Bobbins.

[RoosterShooter]

I've been chasing my tail for days on trying to figure out a stitching and feeding issue with my Boss. Today, I took some much needed down time to try and troubleshoot my Boss that has been giving me stitching issues for as long as I've owned it.

To make a long story short .... I only have 4 bobbins out of 8 that are the same length.

I put my calipers to them and 4 are a consistent 1 29/128 inches across the top.

The other 4 are 1 15/64 inches in length.

Whenever I place the longer bobbins in the shuttle I always get a little resistance from them. The shorter are fine.

Did Tippmann make 2 different length bobbins? If so, could they be causing a tensioning issue with my stitching?

Thanks

[Wizcrafts]

I suspect that your Boss uses the same 441 type bobbins my Cowboy CB4500 uses. I have obtained bobbins from 3 or 4 sources and can tell you with certainty that there is a dimensional variation in some of them. There are a few that are taller and actually protrude beyond the lip of the bobbin case. These bobbins have more tension on the thread than the shorter (normal) bobbins. If this ever becomes a real problem I can easily loosen the bobbin case tension spring a quarter or half turn while using the oversize bobbins.

I don't think your situation should be any more complicated than mine. If a bobbin rides beyond the bobbin case, back off the tension spring a bit until the pull on the thread feels the same as on the shorter, normal bobbins.

You would have actual trouble if the diameter of the top or bottom bobbin flanges was the same as the inside of the case. That would be Emory Cloth time for me, to reduce the diameter for a smooth revolving fit.

Also, I believe that some of my bobbins are more curved on the outside of the flange than others. These would also have a tad more tension for a given thread and bobbin case spring setting. Unless the bobbin actually binds, it shouldn't be a deal buster.

[RoosterShooter]

Thanks Wiz!

I actually took a dremel polishing wheel and compound to the taller bobbins today and put a mirror shine on them. After shining them up they work fine and have the same resistance as the shorter bobbins.