Hardinge KL-1

[pauly45]

In the last photo of the previous post, in the bottom left is the inductor that's between the 240V_ac to 415V_ac transformer and the main motor vfd.

Based on the modelling, it's wound to be approximately 11mH.

The laminations are from a microwave oven transformer!
These transformers are great since they are an E-I configuration, welded together.
The weld can be carefully ground away to open up the laminations and get the original windings off. And the new ones on.

It is now gapped slightly, and held together with the clamps.

Unfortunately, it makes no noticable difference! Which I guess is good.
Only if I was to measure the current should I see a reduction in the peaks, otherwise I have to assume it is doing what the modelling says it should do...