07-04-2021, 03:40 PM
(This post was last modified: 09-04-2021, 07:05 PM by JonE.
Edit Reason: redid with different multimeter
)
More general 1928 DEL (cast aluminium end housing) information:
the two brushes at 90 degrees are held by the same frame, so the micro adjust is just via about 1/2 inch or less in formal fore/aft "slots" in the frame. I was intending to re-centralise the position in the small allowed movement.
The top (thick) brush flex feeds directly to the D terminal.
My field coil setscrews (the big things on the outer casing) are ALL mashed from tightening hard or loosening off... suggesting they have been out since 1928? They are also in quite dark wrapping which looks newer than other things I've seen elsewhere.
The springs which hold the brushes down are easily to set wrongly, so the 'pushing' bit slips off the edge of the brush holder.
They are also impossible to put back on when dislodged, without removing the end plate.
First signs of lack of good third brush regulation: loose brush fixing terminals; brushes practically at the level of the holder - so probably worn.
the two brushes at 90 degrees are held by the same frame, so the micro adjust is just via about 1/2 inch or less in formal fore/aft "slots" in the frame. I was intending to re-centralise the position in the small allowed movement.
The top (thick) brush flex feeds directly to the D terminal.
My field coil setscrews (the big things on the outer casing) are ALL mashed from tightening hard or loosening off... suggesting they have been out since 1928? They are also in quite dark wrapping which looks newer than other things I've seen elsewhere.
The springs which hold the brushes down are easily to set wrongly, so the 'pushing' bit slips off the edge of the brush holder.
They are also impossible to put back on when dislodged, without removing the end plate.
First signs of lack of good third brush regulation: loose brush fixing terminals; brushes practically at the level of the holder - so probably worn.