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Graham

Mirror Cell

29 posts in this topic

Blimey, you ain't hanging about there Graham. Top job. :thumbsup:

Graham likes this

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Thanks. 

This one is for the test rig.

The proper one will be made of stainless steel. 

Edited by Graham
Bottletopburly likes this

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I'll be coming to you when I need a wiffle tree Graham - nice to see a great design in the making. :)

Graham likes this

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That looks great Graham. :thumbsup:

 

How do the pins/bolts attach into the ball joints? A close up pic would be good.

Graham likes this

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Thanks folks.

Pete I will do a short video when I put it together on what holds what and how.

Cannot do it at the moment as all the bearings are a press fit so I cannot put it together properly until it has all been powder coated.

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Nice engineering Graham

Graham likes this

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Cheers Stephen but this is the rough version for the test rig.

I have much more elaborate and decorative plans for the scope ;)

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I have decided to incorporate the jig frame into the design.

This means everything is attached to the frame so I know for sure all the bits are where they are suppose to be.

 

Partially constructed the Whiffle trees I will make the rollers and the safety collars when the mirror is in place.

To give you some idea what it will look like I have used a steel blank to represent the mirror.

 

cell 1.jpg 

 

With the blank removed.

 

cell 2.jpg

 

A close up as promised of the Orbital bearing fixing.

 

orbital fixing.jpg

 

Close up of the rocker bearing fixing.

 

pivot fixing.jpg

 

Finally a video to show how it all moves.

 

 

Astronigel, Tweedledee, Smithysteve and 1 other like this

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That looks great. Your videos really bring these things to life Graham. :thumbsup:

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Nice video Graham and nice to seeing it coming on

Graham likes this

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Thanks Stephen.

Need to get it finished off as I should be in a position to start star testing the mirror next week.

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The pictures say a thousand words. The video does even better! 👍 You are doing a great job! 

 

Couple of dumb questions Graham if you don't mind...

Won't making the whiffle tree in stainless steel make it a tad heavy?

Have you considered aircraft grade aluminium? Maybe 8mm thick plate?

 

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2 hours ago, Smithysteve said:

The pictures say a thousand words. The video does even better! 👍 You are doing a great job! 

 

Couple of dumb questions Graham if you don't mind...

Won't making the whiffle tree in stainless steel make it a tad heavy?

Have you considered aircraft grade aluminium? Maybe 8mm thick plate?

 

 

Hi Stephen

Weight is not an issue for me as the mount I am building will cope with it no problem.

In fact as the scope is going to be circa 2.5 meters in length it may be an advantage.

It is not only the Whiffle trees that are going to be Stainless steel the whole scope is going to be made from it. :)

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before you get it coated try it on the moon

 

Astronigel and Graham like this

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42 minutes ago, Ibbo said:

before you get it coated try it on the moon

 

 

Will be doing a shed load of star tests before I get to the coating stage Steve.

 

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Struff!! This is a mega bit of work Graham. It makes my day to think that gifted nutters like you still exist!!! :-))

Graham and BAZ like this

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3 minutes ago, silentrunning said:

Struff!! This is a mega bit of work Graham. It makes my day to think that gifted nutters like you still exist!!! :-))

 

Dont know about the gifted bit but the rest is spot on :rofl:

BAZ likes this

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I think Alan means you are good at being a nutter Graham ;)

Glad it fits! 👍

Graham likes this

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How will the mirror be held in place, do those four curved thingies clamp on the mirror from the side or over the top?

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4 hours ago, silentrunning said:

How will the mirror be held in place, do those four curved thingies clamp on the mirror from the side or over the top?

 

Those curved thingies sit where they are.

On each end they will have a Delrin roller which holds the mirror on its side. This stops any lateral movement of the mirror but still allows for it to move up and down with the expansion and contraction of the cell.

There will be a safety washer fitted to the top of each post to stop the mirror from tipping.

They will not actully be touching the mirror.

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looking brilliant graham top notch workmanship keep up the good work

Graham likes this

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