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Tuesday:
Day 2. Another bright but frosty morning. I brought the PA housing down
to the floor and did some mock-ups of possible RA motor positions while
inserted in the supporting fork. With the RA wheel and motor simply
inverted there was no room for the mounting base plate. [See arrow,
image right.]Lifting the altitude pivot hole in the PA housing, by the maximum permissible 2cm, would allow some extra room down below. Moving the whole PA assembly down by 2cm would be the easiest way forwards.
It would mean removing the side plates of the PA housing to drill them simultaneously on the pillar drill for accuracy. No big deal with the components already down on the floor for easy access without any loads.
The
next image shows the effect of raising the PA altitude pivot hole by
2cm. This lowers the PA housing by the same 2cm. Giving me bare
clearance between the RA motor plate and mounting base plate. [Arrowed
in red.]By trimming the tops of the support fork tines, on the miter saw, I could move the pivot hole even further towards the N.pole. Which would give me even more clearance for the base plate. I can reach the correct altitude angle [55°] for the PA when the plates are just touching but would have no leeway for adjustment. It is probably best to move the pivot hole further than the absolute minimum for clearance. Better than having to bring the mounting down again just to drill it a second time.
Click on any image for an enlargement.
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