[SML] S4 bench focus...

[Patrick McCreary]

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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