[SML] S4 bench focus...

[Steven Hood]

Tried that. Still not pretty.
Steven R Hood
310.756.3555



On June 25, 2015 7:02:20 AM Patrick McCreary <vze2gmht at verizon.net> wrote:

> Hmm...
>
> Maybe try a donut rather than mess with the reflector optics.
>
> Patrick
>
> On 6/25/2015 9:40 AM, Steven Hood wrote:
> >
> > From what the guys who've been doing the focus work tell me, it's been
> > an issue with clearing the outer edges of the lens field. The lens
> > support posts in the 36 deg lens tubes are visible in the beam unless
> > the Z is cranked way back. 19s and 26s are fine.
> > Steven R Hood
> > 310.756.3555
> >
> > On June 25, 2015 5:41:00 AM Patrick McCreary via Stagecraft
> > <stagecraft at theatrical.net> wrote:
> >
> >> I learned somewhere some time ago that Kerosene was the recommended
> >> lubricant for machining aluminum; perhaps a drop or two on the
> >> offending part would help?
> >>
> >> What baffles me about the Z adjustment conjecture is that it seems to
> >> contradict what I know of ERS geometry - I would think that the Z
> >> adjustment is about positioning the filament in the focal point of
> >> the ellipse, and that the lens system optics wouldn't have any effect
> >> on that - maybe a slightly off batch of lamps?
> >>
> >> Patrick
> >>
> >> On 6/24/2015 6:21 PM, Steven Hood via Stagecraft wrote:
> >>> Lighting folks,
> >>>
> >>> Have any of you had an issue with the outer (XY) knob/nut seizing
> >>> the aluminum hub casting? We have... I've had to drill out 3 of them
> >>> this year - all from units that had been assigned 36 degree lenses.
> >>> It seems like that hub casting is heating up more from having to
> >>> pull the Z adjustment so far into the reflector and seizing on the
> >>> outer nut as a result. Is there some way to prevent that deformation?
> >>>
> >>> TIA,
> >>> Steven R. Hood
> >>>
> >>>
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> >>
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