Why Polishing Buckets Have Centre Columns
The centre column in a PP polishing bucket isn't decorative — it compensates for magnetic field distribution. Here's the science behind it.
Open a magnetic polishing machine box and you may notice something: some buckets have a column in the middle and some do not. This is not random. It is based on how magnetic fields work.
The Problem: Dead Zones — In a round bucket without a column, the magnetic field is strongest at the edges and weakest in the centre. Put a light object in the middle and it will not move. Pins at the edges spin fast, but parts in the centre get no polish.
The Fix: Centre Columns — The column fills the weak centre. It pushes all parts and pins into the strong outer zone. Now every pin is active. Every surface gets treated. Field use goes to 100%.
When You Skip the Column — Square buckets with translational mode do not need a column. The side-to-side sweep covers the full bucket area. There are no dead zones to worry about.
Quick Tip — Use the column for small parts in round buckets. Skip it for large parts in square buckets. Not sure? Run a short test batch. Check the finish. Uneven spots will show up right away.
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