[SML] S4 bench focus...

[Steven Hood]

>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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