I had intended that yesterday's postings would be the end of this saga,
You're all probably sick of seeing Chipped Lister popping up.
However, when I tried to get some insulation which I would regard as
durable, i.e. not just electricians tape, over the motor I found it
difficult to get the engine cover to sit down square. It must be
possible, others have obviously done it. The cover stands up on some
short legs, leaving a gap under the engine cover at the sides. I assume
this was to clear the motor as the drawings in 'Narrow Gauge &
Industrial Modelling Review No. 58 don't show this gap. No doubt Roy
used the smallest motor he could get at the time. Anyway, if you have
been following this tale, you will know that I have a smaller motor on
hand, ex Branchlines.
This morning I have fitted that motor. The kit motor comes with the worm
attached, a very quick waft with the gas torch loosens the adhesive. The
new motor shaft is only 1mm diameter but Sharman make 1.5 to 1 reducing
bushes so I was able to fit the worm to the new motor. I drifted the
holes for the motor screws in the footplate and chassis inwards a touch.
What is critical is the length by which the worm stands away from the
motor base, note from the base, not from the bearing bush on the new
motor. The screws need shortening a fraction, Branchlines say they must
not go more than 1 mm into the motor body. You will need to shorten the
shaft on the worm end and virtually remove it on the other end.
A bit of fiddling and it's running fine, drawing about 20 to 30mA. I
have been able to shorten the legs on the engine cover so there is no
longer a gap at the sides.
Happy New Year to All
Frank
