Third week of December
From the charity event in South Wales we have come to the
following conclusions about some of the changes we have
made to Jim:-
The stop valves have made a significant improvement to the
The changes we made in the legs has reduced the wear on the
wooden guides, and the main triangle seems to be taking the forces
okay. These changes made no net changes to the weight so this
is all good.
Second hand batteries need thoroughly checking out. The one
that stopped Jim in the arena could not hold 8-12 volts for more
than three minutes, with one of the cells getting very hot.
Cleaning the oil from the Air filter has improved the engine
power significantly. We suspect that we have a lot more power
than during the TV recordings! (Need to do some more checks on
The rubber tread in the centre of the feet improve the steering,
but loses too much grip.(Could not get up the ramp)
The audio system PA should of been on a separate battery.
The PA had a high standing current.
The PA was not loud enough to hear Jim's temporary voice over
The trolley is two high and not wide enough and too heavy.
We did a demo of Jim Struts to some friends this weekend
and in the process did some more damaged. The timber which acts
as the anchor for the inner left leg broke. This was caused by
the pin which acts as a hinge worked out, and so was only supported
on one side. The pin ended up been very bent, and the timber
which it was still in was well and truly broken.
|| This picture shows some of the damage.
The grey block is the leg counter lever and is meant to be between
the the two timbers on the right hand side. You can see the broken
timber on the bottom right hand side. The 8mm bent pin is hidden
by the speckled cord but it is coming out of the leg counter
lever at 45 degrees instead of 90 degrees.
The timber has now been replaced and the leg has been
refitted, unfortunately Christmas preparations has halted work
so the leg position sensor has not been refitted.
We managed to find a few moments to refit the leg sensor
and in the process found that it was intermit, we suspect that
this was caused by hydraulic fluid getting in it. Anyway
the sensor was replaced and refitted, it was not easy as you
have to be a contortionist to clip it in.
The results of this work was we managed to do a demonstration
of Jim Struts on Christmas day for our Christmas guests. We discovered
that he walked much better in the mud by having long steps instead
of short steps.
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