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8" F4 Astrograph

Started by Rocket Pooch, May 20, 2011, 07:57:42

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Rocket Pooch

May 20, 2011, 07:57:42
Right,

After the stepper focuser was completed I now have the carbon tube (10mm thick walls), it's been in the bedroom for a few weeks, on its way from the good old USA is a 3 vane custom curved spider for the seconday.

Flock, Baffles and Ultra Black flat paint here, as well as the holo primary spot....

I just need to decide what to do with the focuser and primary support, the rings already on the way.....

Then I have to start drilling and assembling!

Then it's the QSI upgrade and finder scopes?

Nearly there.


MarkS

#1
May 20, 2011, 08:17:50
Will there be anything original remaining?  Primary mirror I guess ...

Mark

Rocket Pooch

#2
May 20, 2011, 08:31:40
That's about it!

Rocket Pooch

#3
Jun 22, 2011, 11:15:25
Hi,

Couple of updates whilst I'm waiting for my custom primary holder!

I found these guys for my electronic focuser pullys http://www.technobotsonline.com/, they have loads of robotics parts.

My secondary holder arrived some time ago, its cool, look below, ignore the fabric in the tube this will come out later.

Chris



IMG_1897 by chrissuddell, on Flickr

mickw

#4
Jun 22, 2011, 13:45:38
Has the secondary holder got a wire attached ?

and why ?
Growing Old is mandatory - Growing Up is optional

Mike

#5
Jun 22, 2011, 15:42:19
If anyone eve orders from Technobots, let me know as I can get you 10% off.
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. Carl Sagan

RobertM

#6
Jun 22, 2011, 18:56:24
FWIW I've used these people http://www.ondrives.com/index.php

They supplied the coupling I used to connect my focuser to the stepper motor and have an incredible range of bits.

Rocket Pooch

#7
Jun 22, 2011, 22:21:19
Mick,

The wires are for a secondary heater, you put a + and - on seperate spider legs, cool eh!


Chris

MarkS

#8
Jun 23, 2011, 06:41:05

It's looking very good Chris!

Mark

mickw

#9
Jun 23, 2011, 08:22:17
QuoteThe wires are for a secondary heater, you put a + and - on seperate spider legs, cool eh!

Clever idea, but I think carbon fibre is conductive  :(

You would need to insulate the legs from the tube
Growing Old is mandatory - Growing Up is optional

Mike

#10
Jun 23, 2011, 09:47:01
Carbon fibre is conductive but I am sure that tube has some kind of coating.
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. Carl Sagan

mickw

#11
Jun 23, 2011, 12:16:48
The gelcoat would be an insulator but fixing bolts would be in contact with the carbon unless they were sleeved.
Growing Old is mandatory - Growing Up is optional

Rocket Pooch

#12
Jun 23, 2011, 14:45:57
Hi All,

I think you have managed to answer the conductive question yourself :-)

Chris

Whitters

#13
Jul 17, 2011, 22:02:26
Like the look of that Chris. The secondary heater is a nice touch.  :D
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