Sewing machine guides

Dating methods, needle and bobbin charts, error-code references — based on manufacturer documentation, not forum folklore.

Bobbin Types Chart: Class 15, 15J, 66, L, M and Brand-Specific Bobbins Bobbin classes by size in millimetres and by profile: Class 15 (A style), 15J, 66, L and M Brother Sewing Machine Error Codes: E1–E7 and F1–F9 Explained What each Brother error code means, what triggers it, and what to do first: presser foot a How Old Is My Sewing Machine? Dating by Brand and Serial Number How to date a sewing machine from the numbers it carries: Singer serial-allocation blocks Janome Sewing Machine Error Codes: E1–E9, LO and E:00–E:09 Explained Janome error codes by model family: E1 zigzag motor, E2 feed motor, E5 jam or foot control Sewing Machine Needle Sizes Chart: 130/705H vs 15x1, 60/8 to 120/19 What 130/705H and 15x1 actually mean, how to read the two size numbers on a needle pack, w Singer Serial Numbers Explained: Prefix, Block, Class and Year How to read a Singer sewing machine serial number: what the letter prefix means, how alloc