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  #101  
Old 21-06-2018, 01:46 PM
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Lognic04 (Logan)
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Awesome!!! Maybe i need to get a custom secondary spider/holder from you for my 10!
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  #102  
Old 24-06-2018, 02:08 PM
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Awesome!!! Maybe i need to get a custom secondary spider/holder from you for my 10!
Logan, there are easier ways for making a secondary spider.
A secondary spider for a Newtonian needs to be sturdier because there is a larger offset for the centre of gravity that needs to be supported.


Meanwhile I 3D printed the focuser cover. After a bit of sanding and a couple of coats of flat black I think it looks acceptable.
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  #103  
Old 24-06-2018, 02:46 PM
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Branded CDK now
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  #104  
Old 24-06-2018, 06:23 PM
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........

Meanwhile I 3D printed the focuser cover. After a bit of sanding and a couple of coats of flat black I think it looks acceptable.
I keep pressing the LIKE button but nothing is happening
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  #105  
Old 24-06-2018, 07:00 PM
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Branded CDK now
This is my registered business name since the year 2000, but I never used it on astro gear until now.

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I keep pressing the LIKE button but nothing is happening
Let's hope IIS doesn't turn into a Facebook hybrid.
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  #106  
Old 24-06-2018, 08:16 PM
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Nice!!! By spider/holder i meant a secondary holder like you made
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  #107  
Old 24-06-2018, 08:17 PM
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When do you start polishing?
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  #108  
Old 28-06-2018, 02:12 PM
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When do you start polishing?
Probably in September when the thermal conditions in my office, where the polishing machine is, will be more suitable. Also the interferometric testing must be done in my shed because it is the only place that I have with a concrete floor, and it would be very difficult now with the low outside temperature - would have to wait forever for the mirror temperature to reach equilibrium every time I measured it.
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  #109  
Old 28-06-2018, 02:22 PM
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The heater element for the secondary is done. 3D printing a soldering fixture made the job nice and easy, and accurate too.
It will deliver 3W from a 12V source. I will try to avoid using PWM. My 100mm Honders guide scope uses a 3W resistor string and recently I got through a night of extreme humidity without any dew on the front lens.
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  #110  
Old 28-06-2018, 02:36 PM
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Resister chain looms pretty cool
Almost artistic!
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  #111  
Old 29-06-2018, 08:44 AM
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Originally Posted by Stefan Buda View Post
The heater element for the secondary is done. 3D printing a soldering fixture made the job nice and easy, and accurate too.
It will deliver 3W from a 12V source. I will try to avoid using PWM. My 100mm Honders guide scope uses a 3W resistor string and recently I got through a night of extreme humidity without any dew on the front lens.
Your attention to detail continues to amaze
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  #112  
Old 02-07-2018, 12:37 PM
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Stefan does SPECTACULAR work.
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  #113  
Old 03-07-2018, 11:15 AM
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Thanks guys for the praise - I always try my best.

So the spider assembly, after a couple more bonding sessions and some cosmetic work, looks like on the attached picture.

The bonding fixture for joining it to the focuser hub is also finished. This will ensure that everything is concentric and symmetrical. This same fixture will also be used for machining the mounting pads that will hold the back plate.
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  #114  
Old 06-07-2018, 09:52 AM
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..and here's the result: Probably the first ever 3D printed astrograph spider.
The four shiny dots near the rim are neodymium magnets for holding the dew shield.
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  #115  
Old 06-07-2018, 09:56 AM
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AWESOME!!!
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  #116  
Old 07-07-2018, 05:01 AM
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..and here's the result: Probably the first ever 3D printed astrograph spider.
The four shiny dots near the rim are neodymium magnets for holding the dew shield.
Awesome indeed
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  #117  
Old 17-07-2018, 09:33 PM
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Beautiful Borofloat blanks have arrived from Germany.
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  #118  
Old 19-07-2018, 01:49 PM
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Haven't you already done the primary?
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  #119  
Old 19-07-2018, 08:15 PM
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Haven't you already done the primary?
http://www.iceinspace.com.au/forum/s...=165877&page=3
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  #120  
Old 19-07-2018, 09:04 PM
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Ah
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