ATM

New Topic

42 topics

Topics

Replies

Views

Last post

Adding handles to the 18 inch Dob.

Last post by pakarinen « Sun May 03, 2020 11:28 am
Replies: 1
by NGC 1365 » Sun May 03, 2020 6:54 am

First post

Added some handles and wheels to my 18 inch dob yesterday. Wheels that are shown on it are temporary till the larger ones that I ordered arrive....

Last post

Didn’t realize one could buy steel wheelbarrow handles. My first thought was you had bent some electrical conduit. Nice!

1 Replies

4494 Views

Last post by pakarinen
Sun May 03, 2020 11:28 am
Mirror cell upgrade for an 18 inch dob.

Last post by NGC 1365 « Sun May 03, 2020 6:04 am
Replies: 2
by NGC 1365 » Mon Dec 09, 2019 10:04 am

First post

I do a few ATM projects every year and this year I decided to upgrade the mirror cell of my 18 inch F4.5 scope and to build an 8 inch binoscope. Both...

Last post

HI Matt, the wiffle tree edge support in my case works noticeably better than the belt sling and the glatter sling. Stars are tighter even down low...

2 Replies

5241 Views

Last post by NGC 1365
Sun May 03, 2020 6:04 am
foucault considerations

Last post by OzEclipse « Fri Dec 13, 2019 4:51 am
Replies: 10
by bobsorenson » Fri Nov 15, 2019 4:27 am

First post

Hello!
I have two big mirrors I want to work on. This whole project is kind of off the wall and I am quite the noob at all of it.

The mirrors; 24 f3...

Last post

Now I am unable to get the mirror face illuminated.....I think because it needs to be polished, the surface is quite matte.
So, 25 micron, 12 m and...

10 Replies

11853 Views

Last post by OzEclipse
Fri Dec 13, 2019 4:51 am
8 inch Binocular telescope build.

Last post by Peter802 « Tue Dec 10, 2019 10:55 am
Replies: 9
by NGC 1365 » Mon Dec 09, 2019 11:00 am

First post

The other project this year was an 8 inch F5 binoscope utilising two GSO mirrors bought about 7 years apart ( and the focal length difference between...

Last post

A nice project. Wish you good fortune with it.

9 Replies

9150 Views

Last post by Peter802
Tue Dec 10, 2019 10:55 am
Cheap refractor glass any good?

Last post by gregl « Sat Nov 23, 2019 5:29 pm
Replies: 17
by gregl » Fri Nov 22, 2019 4:16 am

First post

Are the objective lenses in the cheap refractors any good? Just thinking. As we know, the cheapo scopes sold in big box stores usually have terrible...

Last post

Thanks, JG . :handgestures-salute:

17 Replies

16734 Views

Last post by gregl
Sat Nov 23, 2019 5:29 pm
need help with stepper motor problems

Last post by KathyNS « Mon Sep 30, 2019 1:44 pm
Replies: 1
by VenusAstronomer » Mon Sep 30, 2019 12:25 pm

First post

Hi folks -
so - I posted this last Friday and haven't had any responses so far. I am wondering if I maybe put it into the wrong category; DIY, other....

Last post

I replied on the other thread.

1 Replies

4617 Views

Last post by KathyNS
Mon Sep 30, 2019 1:44 pm
some temptations are too cruel

Last post by yobbo89 « Sat Aug 31, 2019 12:43 pm
Replies: 17
by mcolbert » Tue Aug 20, 2019 1:32 am

First post

I am seriously trying to figure out how I could get my hands on this;

Last post

i think it cost about $900 to $1000 to just coat a mirror that size

17 Replies

16476 Views

Last post by yobbo89
Sat Aug 31, 2019 12:43 pm
Sourcing plans and parts for a bath interferometer

Last post by Kanadalainen « Thu Aug 29, 2019 3:31 pm
Replies: 4
by Kanadalainen » Tue Aug 20, 2019 4:05 pm

First post

This person making and selling this stuff is a member of an interferometry group that I subscribe to (interferometry@groups.io)

You can build an...

Last post

Hi Yobbo,

Yes! You can always check up on the mirrors already in your hands (like that skywatcher in your armamentum) which is fun as well.

Ian

4 Replies

5791 Views

Last post by Kanadalainen
Thu Aug 29, 2019 3:31 pm
9.5 mirror -- 2nd try at posting

Last post by notFritzArgelander « Wed Aug 21, 2019 2:15 pm
Replies: 11
by BABOafrica » Mon Jun 03, 2019 3:29 pm

First post

I just finished an f/7.5 9.5in mirror and loaded it into the OTA. The mirror is NOT coated yet. Just glass. Well, the secondary is coated but not the...

Last post

Thanks BABO,

Good to know about the Ronchi test equipment. I have most of that stuff. Will any wavelength LED work fine?

I'm starting on a...

11 Replies

11142 Views

Last post by notFritzArgelander
Wed Aug 21, 2019 2:15 pm
What DIY project did you work on this week?

Last post by Lokifish « Thu Aug 01, 2019 4:32 pm
Replies: 17
by Rainmaker » Sun May 12, 2019 6:41 am

First post

I am sure there are a myriad little DIY projects out there that will give ideas and guidance to others:

For me DIY has been a necessary evil, though...

Last post

While it was technically done last week, here's a junk bin 2 wide field eyepiece. It uses edge chipped objectives from a pair of old 7x35 binos, the...

17 Replies

6828 Views

Last post by Lokifish
Thu Aug 01, 2019 4:32 pm
now this is tempting

Last post by mcolbert « Mon Jul 29, 2019 4:53 am
Replies: 2
by mcolbert » Mon Jul 29, 2019 2:02 am

First post

a 20cm dia!

and there TWO of them!!!!

Binocular project anyone?? I would just be happy fixing them up, but as I said to my wife, imagine the...

Last post

one of the reasons to have a very active DIY group close by. ;)

2 Replies

2240 Views

Last post by mcolbert
Mon Jul 29, 2019 4:53 am
finally managed a lunar image: 9.5" mirror first light

Last post by Juno16 « Tue Jul 23, 2019 9:38 pm
Replies: 7
by BABOafrica » Mon Jul 22, 2019 12:55 pm

First post

The title says it all.

Here are two different images I got of the moon last night using my (not-yet-coated) 9.5 mirror, which I described in...

Last post

Very nice images Joe!

Looks like you have a keeper there!

Thanks,
Jim

7 Replies

3179 Views

Last post by Juno16
Tue Jul 23, 2019 9:38 pm
Surplus Shed refractor objective sale

Last post by OleCuss « Tue Jul 16, 2019 1:06 pm

by OleCuss » Tue Jul 16, 2019 1:06 pm

Surplus Shed is on their 2nd (and last) day of a sale of achromatic refractor objectives. If one is interested in building out a refractor it might...

0 Replies

1883 Views

Last post by OleCuss
Tue Jul 16, 2019 1:06 pm
Sources for finished mirrors?

Last post by mcolbert « Mon Jun 17, 2019 6:39 am
Replies: 18
by OleCuss » Thu Jun 13, 2019 2:16 am

First post

I may end up having a Newtonian made. If I go this way I need to source a really nice mirror. It'll probably be an 8 , F/6.

I've not even looked at...

Last post

oops! Roger????? I meant Gordon. ;)

18 Replies

5719 Views

Last post by mcolbert
Mon Jun 17, 2019 6:39 am
9.5 mirror & scope

Last post by Bigzmey « Tue Jun 04, 2019 4:59 am
Replies: 4
by BABOafrica » Mon Jun 03, 2019 2:13 pm

First post

I just finished an f/7.5 9.5in mirror and loaded it into the OTA. The mirror is NOT coated yet. Just glass. Well, the secondary is coated but not the...

Last post

Fun project! Good luck!

4 Replies

2730 Views

Last post by Bigzmey
Tue Jun 04, 2019 4:59 am
bath interferometer

Last post by BABOafrica « Mon Jun 03, 2019 6:17 am
Replies: 4
by Kanadalainen » Sun May 12, 2019 12:56 pm

First post

I am putting together some plans for a bath interferometer.

Just because it looks like an accurate way to measure mirror quality, to ridiculous...

Last post

I'll be posting my results for my bath test in a thread shortly.

Dale can give you all the info you need.

BABO

4 Replies

3143 Views

Last post by BABOafrica
Mon Jun 03, 2019 6:17 am
First home made DOB

Last post by mcolbert « Sun May 26, 2019 11:04 pm
Replies: 19
by helicon » Mon May 20, 2019 3:09 pm

First post

I'd like to tell the story of my first Dob.

First of all, I was introduced to the San Francisco Sidewalk Astronomers and John Dobson at the age of...

Last post

Probably my most scary speech was my oral exam when I was getting my doctorate. You had to defend your dissertation in front of the assembled...

19 Replies

6866 Views

Last post by mcolbert
Sun May 26, 2019 11:04 pm

New Topic

42 topics

Return to Board Index

Forum permissions

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum