Jump to content
  • Join the East Midlands Stargazers today!

    You can register an account easily by clicking here or by using your Facebook or Twitter account. Once you've joined you'll be able to post on the message boards and get to know astronomers in your local area!

Tweedledee

Mirror cell mock up

Recommended Posts

Tweedledee    1,521
Tweedledee

A bit more messing about with the mirror cell. :)


Graham recently machined some bespoke aluminium flanges for the collimation adjusters to pass through, and they are perfect for the job. The threaded rods are M10 stainless steel and will allow collimation from the top of the mirror box using the knurled knobs. Got some knurled locking nuts coming from ebay. Graham is also responsible for the superb water jet cut whiffletrees and the 6 trefoils, all aluminium. Very pleased at how it is coming together. :)

20170807_190701s.jpg?raw=1

 

20170807_210017s.jpg?raw=1

 

20170807_190900s.jpg?raw=1

 

20170807_190628s.jpg?raw=1

Must get that Baltic Birch mirror re-aluminised. :lol:

 

20170807_191040s.jpg?raw=1

Share this post


Link to post
Share on other sites
stash    313
stash

Very well engineered ! Hope you are either very strong or have a JCB - that's going to weigh quite a bit I would have thought if the plywood is staying - what do you estimate the weight to be when all finished Pete?

Share this post


Link to post
Share on other sites
Tweedledee    1,521
Tweedledee
6 minutes ago, stash said:

Very well engineered ! Hope you are either very strong or have a JCB - that's going to weigh quite a bit I would have thought if the plywood is staying - what do you estimate the weight to be when all finished Pete?

Thanks Clive.

 

I plan for it to weigh only marginally more than my 14". It will be far heavier when I put an eyepiece in. :D

 

The plywood mirror box will be strategically reduced and far less bulky than you see above, but structurally triangulated for strength in the right places. It won't look much like a hexagon when I've done, but will be something far more stealth like. There will be some lightweight super rigid carbon fibre structure to come. I intend for it to be very quick to strip down and set up. It will go into the car in three or hopefully just two pieces and fit together with just one or at most two hand tightening bolts. It will be a radically different design to almost any other dob. A grab 'n go 20"!!!! :D

Share this post


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


×