12 Jun
2006
12 Jun
'06
9:15 p.m.
Tony Duell wrote:
The spindle is about 1.5mm in diameter IIRC (I've not put the micrometer
on it, so don't make something based on that). Making a hole-with-flat of
that size could be 'interesting!
Personally, I'd want to use a metal gear that
was a sliding fit onto the
motor sprindle, and then fix it on with a suitable Loctite.
I'd be tempted to file a flat section on the shaft and add a matching flat to
the gear, or use a small screw to fix it. I'm not
sure what the lifetime of
Again, a very small screww (M1, or smaller, I would think).
Loctite is, but I wouldn't want to be pulling a
plotter apart a few years down
the line just to put some more glue on a gear...
I haev never had this sort of Loctite fail. It's the sort of thing that's
specified to lock certain bolts in modern cars, and they don't expect
said bolts to undo themselves after a few years :-)
In any case, shoulkd the gear come loose in one of these plotters, it's
not going to cause death, injury, or even loss of income I would have
thought :-). And I'd rather have to pull the cover and put another drop
of Loctite on the spindle every 10 years (or whatever) than to have to
keep on making plastic gears like the original.
-tony