. This is the literal "top" piece for barrel-type components in the M-1 series. : Part No: B1109761000 Go to product viewer dialog for this item.
The is not a sign of poor engineering—it’s the result of years of thermal cycling and vibration in brutal industrial conditions. However, ignoring it leads to costly electrical damage or inaccurate cutting. juki pm1 crack top
Cast iron is stubborn. Preheat the entire top casing to 500-600°F (260-315°C) using a propane rosebud torch. Do this slowly. Uneven heat creates new cracks. Use a temperature stick to verify. The is not a sign of poor engineering—it’s
You must strip the Juki PM1 down to the bare casting. Remove the arm top cover, thread take-up lever, needle bar assembly, presser foot bar, and main shaft. If you weld with oil or bearings in place, the heat will destroy them and the residual oil will cause porosity. Preheat the entire top casing to 500-600°F (260-315°C)