manufacturing 204/1800 carbon bezel

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banjo
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manufacturing 204/1800 carbon bezel

Post by banjo »

Good morning all,

sorry for my English translators google :mrgreen:

modification of my bezel folded in linear carbon tube

why this change? well, always the same, I have to see if the grass is greener on the other side of the fence xDxD

the folded one worked pretty well, exactly 13kg and I keep it to eventually move around and switch from one configuration to another will take me little time.

Above all, it had the advantage of folding up a little more for transport (see photos) no bigger than a newton of one meter.
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we start with the carbon tube made by Klaus Helmerichs, superb quality, perfect dimensions, light weight, nothing to say
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for the supply of the front/rear "shells" I chose Métalaladécoupe, the only ones to have 250mm aluminum tubes for sale (on their site)
once the order has been placed, obviously no phone call but possibility of making a plasma cut for the same price, doc Ok
on delivery (see photos) we see that they are good for nothing and bad for everything, in addition to being incompetent they have a dismal after-sales service,
like "I'll find out at the workshop" and more answers.
138 € the kilo of aluminum we can expect better.
I repeat that I wanted the 250mm tube to make a recovery of max 1mm (the Istar barrel is 246mm, I need a little margin for the support of the 255mm erf).
see the work of dummies
tot.jpg
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I am lent an antique lathe, we are the same age, we respect each other and we turn potatoes but it takes the 250mm at ease (sorry for the image quality, it was done with a laptop of the same age) :D
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not too bad though
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I therefore send to have anodized in matt aluminum (it is my choice, thanks to an astam and there is the competence of the service and a very contained price (45 € shipping included) http:// https://www.eloxalplus .com
there waistband plus straps epoxy bonding + side screws
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we go to the support of Po, I'm a little afraid the sheet is only 3mm thick
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we weigh the beast without optics and Po
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and the weight and the weight !!!!!
well I still don't come back exactly the same with the same configuration with the penalty of the necklaces which weigh heavily

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I started the optical alignment of the bezel
mask in front of the lens with center for alignment of the Po towards the lens,
this is where we see the German precision for the dressing of the sides of the tube and it may be me who is screwed up at the collage of the "ferrules" (by the way what do you call it is things in front and behind the tube ?)
he mask with center marked on tracing paper in front of the lens

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e return of the laser by auto collimation when this damn laser wants to give full power, really disappointed by the Baader very well centered but completely crazy,
I can change the batteries, but it flashes like crazy and loses power immediately when it is turned on >:(, but I think I'm good for the little I've seen, if it comes off
I'm going to try a star tonight.
for the moment I am bothered by the balancing and I have not yet put the erf in front (3.5kg) so at least 5 kg more at the same level, I will have half the weight in counterweight
more than in the weight of the bezel, it's the huge difference with the folded version which largely passed on the eq6. there 13kg + 8kg /10kg I will be around 23/25kg
the lever arm of the tube does it but with the eq8.
I put it after the dovetail and not on the tube, it's the best solution to not have any bending of the tube, it's completely independent.
it's gypsy for the moment, but once the weight and the position is well determined I'll make it more presentable :mrgreen:

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today modification of the ERF support 360g gained on the front is 500g less on the Po to compensate.
in addition it was very ugly (but effective)

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we prepare the buffers to leave a little play in solar it is better to make a little "flexible" for the temperature deltas.
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for flat
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bresser/messier 150/1200 (or 200/1800 Istar ) Mod -D-Erf 160mm intern-glasspath 1.25-etalon Pst barlow X2 ASI174
https://astropol.pagesperso-orange.fr/b ... 9/best2019
sorry for my English translators google :mrgreen:
pupak
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Re: manufacturing 204/1800 carbon bezel

Post by pupak »

Fantastic project, banjo.
Good luck.
Pupak


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Re: manufacturing 204/1800 carbon bezel

Post by marktownley »

Very cool to see the build Paul!


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banjo
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Re: manufacturing 204/1800 carbon bezel

Post by banjo »

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bresser/messier 150/1200 (or 200/1800 Istar ) Mod -D-Erf 160mm intern-glasspath 1.25-etalon Pst barlow X2 ASI174
https://astropol.pagesperso-orange.fr/b ... 9/best2019
sorry for my English translators google :mrgreen:
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