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Urban Astronomer

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Category Archives: making-telescopes

On 3rd of January 2011, I began my telescope making journey. It is still a work in progress. These pages are the chronicle of that journey.

 

One day I will finish!

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On hold

Urban Astronomer avatarPosted on 17 August, 2011 by Allen Versfeld

I just realised that I haven’t touched my mirror in almost two months.  Ouch.  I’ll spare you the excuses (nothing much has changed except for the fact that the new baby has severe reflux, which is harmless but does make all baby-related tasks that much slower.  Refluxy babies vomit a lot, and very easily.  Any one feeding might have to be repeated three times and take over an hour.  This is frustrating, and has knock-on effects.  Oh, that bit about … Continue reading →

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21 June – easing back in

Urban Astronomer avatarPosted on 21 June, 2011 by Allen Versfeld

I managed to complete and submit the assignment this morning, leaving me free to keep my promise.  Not a whole lot got done – only three wets and a whole lot of getting to know my mirror again under a bright light.  I’m doing something that never occurred to me before:  Find pits, mark them with a permanent marker, then photograph the mirror.  Do a few wets, then repeat, and compare photographs.  Much easier to keep track of which pits … Continue reading →

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Get back to work!

Urban Astronomer avatarPosted on 20 June, 2011 by Allen Versfeld

Time flies when you’re having kids.  In the last entry, I promised to wait no more than a single month before unpacking my mirror and resuming grinding.  I now see that I have only two days left, and am not ready!  But I haven’t been lazy.  In that time, my wife has had a baby, my plumbing has sprung multiple leaks (and in a separate incident, had the geyser burst) leading to my landlord’s cut-rate plumbers tearing open half the … Continue reading →

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Sabbatical

Urban Astronomer avatarPosted on 22 May, 2011 by Allen Versfeld

As I anticipated a month ago already, I’m packing away my still-incomplete mirror to get on with the demands of Real LifeTM.  My wife is expecting to deliver our third child in a little over a week, I am about to start exams, and my employer will have me travelling.  I gather many ATM projects have died this way – they get put aside for a while, to be resumed on some future date that never comes. The good news … Continue reading →

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9 May – working on those pits

Urban Astronomer avatarPosted on 11 May, 2011 by Allen Versfeld

Late in the evening of 9 May, I spent about an hour and a half working on the mirror, with maybe 45 minutes actual grinding.  Two wets with #320 carbo, tool on top, 1/3 diametral strokes, very light pressure.  Rinse and dry the mirror, inspect, do another two wets.  The giant megapit near the centre is visibly reducing (I can see the irregular bottom now – it looks like two overlapping pits.  Eventually they’ll separate into two small pits, and … Continue reading →

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