[rollei_list] Re: WTB -P11 reflector
- From: John Wild <jwild@xxxxxxxxxxxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 15 Dec 2008 10:40:20 +0000
Thanks for all your input.
The reflector is a front surfaced parabolic mirror, so unfortunately a flat
one will not work.
Having checked the temperatures (with a 300w bulb), the rear surface of the
mirror reaches about 45C, the front surface about 150C and the matt black
top surface of the lamp bulb about 250C.
Intertronics list an adhesive which can withstand 250C, so I will check that
out.
The projector still works well, it's just that one piece of the reflector
has slipped slightly and so will not be reflecting all of the light into the
optical condenser.
Failing adhesive repair working, I will just wait to see if a broken P11
comes up for spares somewhere at a sensible price.
John
On 12/12/2008 20:00, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>
>
> ----- Original Message -----
> From: stephen@xxxxxxxxxxxxxxxxxx
> To: rollei_list@xxxxxxxxxxxxx
> Sent: Friday, December 12, 2008 10:29 AM
> Subject: [rollei_list] Re: WTB -P11 reflector
>
>
> Hi John:
>
> Edmunds Scientific still sells 'First Surface Flat Mirrors'.
> You should be able to take one of those with your broken
> mirror to a glazier and have him cut you an exact
> replacement.
>
> http://scientificsonline.com/product.asp_Q_pn_E_3052324_A_quick_order_E_true
> -----Original Message-----
> From: John Wild [mailto:jwild@xxxxxxxxxxxxxxxxxxxxxx]
> Sent: Friday, December 12, 2008 04:32 AM
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] WTB -P11 reflector
>
> Is this a flat mirror? If so the Edmond mirror would
> probably work but the Rollei mirror may also be a dichroic
> mirror meant to reduce the heat from the lamp. I am not
> familiar with the internals of the projector. Edmonds might
> have dichroics of the right sort.
> The trick to cutting thin glass is to use a carbide
> scribe rather than a glass cutter. Such scribes are
> available at hardware stores. I got one at Home Depot for a
> few dollars.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
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