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Starting to build a 240mm Newtonian

More aperture is better. I’ve started to build a 240 mm Newtonian with some mirror blanks from Tammilasi and knowledgeable help and grinding materials from Teknofokus.

The first task was to grind the 240 mm diameter (40 mm thick) borosilicate mirror blanks flat on each side. This took around 1.5 hours per side using 60-grit silicon carbide and grinding against a flat steel plate.


See also mirror grinding video by The Sky at Night/BBC.

This entry was posted on Tuesday, July 22nd, 2008 at 21:27 and is filed under Astro. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

2 Responses to “Starting to build a 240mm Newtonian”

  1. anders Says:
    July 30th, 2008 at 21:08

    I’ll try to blog about updates to the telescope project, and also post some pics and thoughts to the forums:

    Astronetti, in Finnish:
    http://foorumi.avaruus.fi/index.php?topic=2784.0

    Cloudynights (probably the largest astronomy forum out there)
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/2550576/page/0/view/collapsed/sb/5/o/all/fpart/1

  2. Bookmarks about Build Says:
    October 20th, 2008 at 18:30

    [...] - bookmarked by 1 members originally found by engage11 on 2008-10-06 Starting to build a 240mm Newtonian http://www.anderswallin.net/2008/07/starting-to-build-a-240mm-newtonian/ - bookmarked by 2 members [...]