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RA Gear assembly fitted
Today I fitted the RA worm and two clutch plates to
the homemade GEM.
Top clutch is fixed to the RA shaft with grub screws and
has a cork washer sandwiched between the worm gear.
The bottom clutch plate is also fixed to the RA shaft
but has 4x5mm pressure adjustment screws acting on
another cork washer.
I must say again, as with the DEC axis,the feel of this type
of clutch working on a well balanced GEM is divine....
it slips beautifully with moderate pressure, but takes up
and drives with only finger pressure twisting on the worm.
Again, at the risk of repeating myself, this clutch assembly
will stay even if the worm gear ends up with woeful PE.
As you can see, the worm carriage is only held so far with
some G-clamps to adjust mesh via shims.
All that remains is to fit the reduction gearbox and stepper
back on and I'm in business for the accuracy test......
Pic 1: side view of the sandwiched worm gear.
Pic 2: worm carriage in mesh underneath.
Pic 3 and 4: wide shots....of the whole assembly.
Steve
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