2 reasons. 1) the blade you are using is stretched, so that it is warped or twisted, and it needs to be replaced, or 2) The wheels (upper & lower) are misaligned, and need to be trued. This usually happens by making "alignment adjustments". God bless your efforts.
Answers & Comments
2 reasons.
1) the blade you are using is stretched, so that it is warped or twisted, and it needs to be replaced, or
2) The wheels (upper & lower) are misaligned, and need to be trued. This usually happens by making "alignment adjustments".
God bless your efforts.