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Charlie HeinAdministrator
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Reged: 11/02/03

Loc: 26.06.08N, +80.23.08W
Barkonian ATM RFT Refractor Project new
      #5296306 - 06/30/12 12:36 PM

Barkonian ATM RFT Refractor Project

By Kevin Barker


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cheapersleeper
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Reged: 01/22/10

Loc: Sachse TX
Re: Barkonian ATM RFT Refractor Project new [Re: Charlie Hein]
      #5296989 - 06/30/12 09:31 PM

Great idea!!! I would love to put my Dob building skills into a refractor.

Regards,
Brad


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Rayh
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Reged: 08/22/05

Loc: Gilbert, AZ, USA
Re: Barkonian ATM RFT Refractor Project new [Re: cheapersleeper]
      #5298234 - 07/01/12 05:05 PM

This is partly my problem because I am not an ATM but this article really would have been better if there were a single labeled sketch to see what the optics are on the finished product.
Ray


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Kevin Barker
super member


Reged: 04/22/09

Loc: Auckland, NZ
Re: Barkonian ATM RFT Refractor Project new [Re: Rayh]
      #5300807 - 07/03/12 03:16 PM Attachment (262 downloads)

Rayh
You are right I should have put a sketch of the optical config in the article. Although I have described the way I went about it. It is basically all wood. I made this scope just before rushing off for a Venus transit trip to Northern Australia.

Note in the shot below one can see the three 32 mm screws which hold the back plate with secondary assembly in place.

Kevin B

Edited by Kevin Barker (07/03/12 03:35 PM)


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Kevin Barker
super member


Reged: 04/22/09

Loc: Auckland, NZ
Re: Barkonian ATM RFT Refractor Project new [Re: Kevin Barker]
      #5300828 - 07/03/12 03:29 PM Attachment (257 downloads)

The shot above includes screws which I used to help align the secondary. I removed them. One can also see the central 7 mm bolt and the three 6 mm bolts screwed through the ply. These are used to adjust the secondary tilt.

Below is a shot of the method I used to set objective. note ; I used sandpaper shims as well well as blocks which were screwed down firmly when i was satisfied I was reasonably central.

Although this looks crude it was quite easy after carefully screwing in place then adjusting the secondary to get a laser beam and chesire cross hair collimator to show the optics were well aligned. I have been using this scope daily and it has retained good collimation.

Kevin B

Edited by Kevin Barker (07/03/12 03:32 PM)


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Rayh
sage


Reged: 08/22/05

Loc: Gilbert, AZ, USA
Re: Barkonian ATM RFT Refractor Project new [Re: Kevin Barker]
      #5304538 - 07/05/12 10:45 PM

Thanks, Kevin! I get it now. Somehow my brain was thinking a curved secondary.
Ray


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Kevin Barker
super member


Reged: 04/22/09

Loc: Auckland, NZ
Re: Barkonian ATM RFT Refractor Project [Re: Rayh]
      #5307236 - 07/07/12 07:56 PM

Ray
I did consider making a spider but then thought cutting a 40 mm diameter circular piece of timber and mounting to a back plate was easier to fabricate.

It worked!!!

Kevin


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