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Newt Mirror Cell

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#1 zoddette

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Posted 06 December 2018 - 02:00 PM

Anyone know of reasonably priced mirror cells. This is for my 8' f3.5. I had saved budgeted to buy an Aurora Precision and filled out the order form but, I was informed by email today that they have a 42% price increase that's not reflected in the website or order forms. Puts that out of my budget.

L&Z



#2 drneilmb

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Posted 06 December 2018 - 02:02 PM

At that size, depending on the thickness of your mirror, it is entirely possible to construct a very good mirror cell. How thick is your mirror? What sort of tube or box does the cell need to attach to?

#3 Pinbout

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Posted 06 December 2018 - 02:26 PM

How thick

 

https://www.youtube....h?v=aFi7gxWSS_Q

 

oops

 

this one  grin.gif

https://www.youtube....h?v=1RZCgcWufww


Edited by Pinbout, 06 December 2018 - 02:29 PM.


#4 sg6

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Posted 06 December 2018 - 02:33 PM

Orion Optics UK make an 8" at £160, at I guess a 1.4 exchange rate that is $225 and then you have shipping and import to add in, likely little saving. I see the Aurora says $225 which I assume is before the 42% increase. The OOUK may be a little less at the end but not by much is at all.

 

Dobstuff may be worth a look: http://www.dobstuff.com/components.htm

Astrogoods: https://www.astrogoods.com/cells.shtml

 

Easy way to locate a few is enter "mirror cells" in to google and scroll down to the "Images of mirror cells" and open that up. Lots of mirror cells and who produces them.



#5 Starman47

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Posted 06 December 2018 - 02:40 PM

I am not sure what you need. But you may try Dobstuff mirror cells. http://www.dobstuff.com/components.htm

 

 

I have one of his mirror cells in my 12 inch telescope. It works just fine. Just be sure to use a double spring at each collimation bolt. Put one smaller spring inside the larger spring. When you install the cell into the telescope you should tighten the bolts as far as possible, and then collimate by loosening the bolts as needed. This creates a tighter fit, which means that collimation stays in place.



#6 Sam Danigelis

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Posted 06 December 2018 - 04:34 PM

I did this one and it was inexpensive, and easy to make. Works well...

http://garyseronik.c...your-reflector/
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#7 daviddecristoforo

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Posted 06 December 2018 - 04:59 PM

I have an 8” mirror cell from an Orion newt that you can have if you want it. Just cover the shipping. PM if interested...

 

 

Attached Thumbnails

  • 9225CF9E-4EAD-4FF2-9EB3-80DB0BE11C9A.jpeg

Edited by daviddecristoforo, 06 December 2018 - 04:59 PM.

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#8 Pinbout

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Posted 06 December 2018 - 08:02 PM

gallery_106859_3508_13403.jpg



#9 zoddette

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Posted 08 December 2018 - 01:35 AM

Thanks for all the ideas, lots of home grown wood and aluminum cells. I'm looking at the Orion UK or the TS optics now cells now, but as someone said, exchange rates and $50 to ship eats into cost savings. We have a lathe with DRO and lots of aluminum plate, maybe I'll look these designs over have hubby make one us one. Only drawback there is it will take him a month, this wasn't supposed to be a huge project.

 

zo



#10 zoddette

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Posted 08 December 2018 - 01:39 AM

David,, thanks for the offer but we have a 247 mm tube OD, some mounts just don't work for us. Our mirror is a true 203 mm f3.5.  Some cells won't fit a 203 mm. 

 

zo



#11 Lognic04

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Posted 08 December 2018 - 01:46 AM

My 10" cell took a day, it's really simple :)



#12 brebisson

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Posted 08 December 2018 - 02:48 AM

hello,

 

cells for a 200 are quite easy to do, so do not fret too much...

 

assuming a 25mm thickness and 63 mm secondary, plop gives a 3nm RMS deformation with a 3 point cell (this is a lambda /180 roughly)..

 

More interesting, in your case, it calculates the 3 points at 4cm from the mirror center. very close to the secondary. this means that you should be able to just silicone glue the mirror to the cell, making the cell even simpler!

 

Good luck.

 Cyrille



#13 Garyth64

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Posted 08 December 2018 - 08:50 AM

Here's a mirror cell made from ½" aluminum:

 

mirror.jpg

 

Made a pattern on paper, transferred it to the aluminum, and cut it out on a band saw.The two sections are basically the same.


Edited by Garyth64, 08 December 2018 - 08:52 AM.


#14 daviddecristoforo

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Posted 08 December 2018 - 02:47 PM

David,, thanks for the offer but we have a 247 mm tube OD, some mounts just don't work for us. Our mirror is a true 203 mm f3.5.  Some cells won't fit a 203 mm. 

 

zo

FWIW, I measured it and the mirror that came out of it is 203mm. The overall diameter of the cell is 220mm. Don't know the ID of your tube but this might fit...


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