Jump to content

sgl_imaging_challenge_2021_2.thumb.jpg.72789c04780d7659f5b63ea05534a956.jpg

20inch Dobsonian Construction


Recommended Posts

  • Replies 207
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Popular Posts

Hello again Scopers.  Almost finished scope and First light experience. Ok so Ive push the project almost to the end now. Ive had to lash together my secondary mirror holder for now. Because Im still

Hello Scopers  I managed to get the inside of the secondary cage and the mirror box Flocked. this was fun and tricky. I enjoy a challenge. I varnished all the surfaces to be covered with flock to ensu

OHHHHHHHHHHH

Posted Images

Sure is :)  But I guess it should be for the amount of work that went into it :D  Not sure I would have the patience :grin:

I'm almost sure you would Gina although you'd have to cut down on the flurry of project's that keep appearing from your way  :grin:

  • Like 1
Link to post
Share on other sites

Hi again Scopers

I managed to get some time over the last few evening to work on the mirror cell. Ive not managed to get the Tail gate welded up yet as im still waiting for a friend to contact me.

besides that i Got the back of the triangles on the mirror cell tapped for some m3 3mm socket screws to hold the flexible plastic parts that hold the cell all in shape.

Also i cut the slots in some m10 bolts for the split bolt sling supports and i purchased some 30mm round plastic Acetal rod for the Side pins that i cut 3 lengths and drilled a 10mm of center hole in them. 

All in all it starting to look like a mirror cell now. and i have a smile on my face. :-)

post-5432-0-11152300-1427406869_thumb.jp

post-5432-0-28500100-1427407005_thumb.jp

post-5432-0-23776400-1427406989_thumb.jp

post-5432-0-25092800-1427406797_thumb.jp

  • Like 1
Link to post
Share on other sites

Here's a little up date. I got the holes drilled in the poles for the Secondary cage and also the threaded inserts (star nuts) pushed in to the end of the poles. I love using large heat shrink around poles to give a nice matt black finish and gives a durable cover. I have used this on other scopes and projects many times and found it very hard wearing and looks great. 

post-5432-0-40013600-1427910872_thumb.jp

post-5432-0-07118200-1427910890_thumb.jp

post-5432-0-66928600-1427910911_thumb.jp

post-5432-0-94461100-1427910936_thumb.jp

Link to post
Share on other sites

Look's a top bit of work Pete, especially like the red anodised allen cappers.

Heat shrink does the trick nicely, Where did you get the heat shrink roll from as I've been looking round for my scope build when it eventually kicks off  :huh:

  • Like 1
Link to post
Share on other sites

Look's a top bit of work Pete, especially like the red anodised allen cappers.

Heat shrink does the trick nicely, Where did you get the heat shrink roll from as I've been looking round for my scope build when it eventually kicks off  :huh:

Hi Damian 

Yer mate i had to get some red aluminium bits in there to match the Red Moonlite focuser. Had to be done. love things to match. 

Shame i bought the quick release mechs in black before i got the Focuser. hehe

heres a link to the eBay  for the heat shrink. I think its a reasonable price. 

http://www.ebay.co.uk/itm/261697073714

  • Like 1
Link to post
Share on other sites

But you are surely not going to need 32 meters!

There again just realised you are making 2 scopes so with eight poles each and just under 2m per pole you will need that much! :0

  • Like 1
Link to post
Share on other sites

Hi Scopers 

Another small up date. I managed to get some time to make the secondary mirror collimation thumb screw plate. Cut on my bandsaw from a 5mm piece of Aluminium. I drilled and tap M5 holes for the collimation thumb screws and drilled four 25mm holes out of it to keep the weight down and then sanded and polished it up. Rather happy with how it turned out. 

post-5432-0-99851800-1428529124_thumb.jp

  • Like 1
Link to post
Share on other sites

Hi Scopers 

Another small up date. I managed to get some time to make the secondary mirror collimation thumb screw plate. Cut on my bandsaw from a 5mm piece of Aluminium. I drilled and tap M5 holes for the collimation thumb screws and drilled four 25mm holes out of it to keep the weight down and then sanded and polished it up. Rather happy with how it turned out. 

attachicon.gif20150408_222723.jpg

lovely work fella

  • Like 1
Link to post
Share on other sites

just bought them lol. thanks for that. now shouldnt you keep building instead of being on here :tongue::grin:

I would be building right know but sadly its not possible. I have all the materials now but finding the time is hard. hopefully in a couple of weeks i will get a solid week in my workshop with my scope. Fingers crossed. 

  • Like 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.