Chriske

For maximum performance the eyepiece of this scope needs a tilt of 8.88°
So this what it will look like.

On the left,
Focuser barrel,   8.88° correcting device,   2" to 1"1/4 adapter, and on top the eyepiece.

Every eyepiece needs it's own 8.88° adapter, except for the par-focal eyepieces of course.

Next (drawing)step.Secondary cage and also a small shield just below the secondary mirror
Between the trusses we will add cross-connection to make it all very stiff.

it is GT2 I used a few times..😉

Meanwhile busy drawing and we all decided to build a 300mm instead of a 250mm.
So David, to compare ours with your 300mm Newt... Start grinding...!😁

This is only a prototype on paper. Lots of meetings and discussing ahead.
But we will start grinding optics very soon.

The scope will be build in two parts. So whenever we decide to go and observe at an other location, it will be easier to transport.

Some more drawing to do...

This is how I've done it a few times.
And it will work on very small poullies. It is incredibly strong..!
It is not my YT movie...!

I'd you use a smaller stepper like a Nema11 or even a Nema8 with reduction.
For such a small task I think a Nema17 as way to big.

Circular blanks also do chip a little bit when the bit reaches the lower surface, but just a little bit.
To avoid it I a put a extra glass disk under the mirror. So doing the chipping is absolutely minimal and sometimes non existing. I need to press the two disks very firmly against each other.

Thanks anyway...👍

Mirror 2 and 3 have the same ROC, and will be grinded together. The tool will be mirror 2 and the mirror(as we usually call it, so the concave one) will end up as mirror 3 in this system.
Because a few of us will be making the same Brunn we're planning to make these two mirrors(2+3) completely different. We will be using large blanks, large enough to cut these smaller mirrors out of it using  these...

It will save us lots of grinding and polishing work...😃

This is how it will loo like.

It is indeed our intention to make an unobstructed telescope.
Not only that but given the fact that sinds 1981 we've build 'a few' telescopes we wanted to build someting completely different and most of all a long focus telescope.
 Meaning this telescope will be used exclusively for Moon and planets. These extra reflection is no problem at all because our 'targets' are all rather bright...😀

Someone made such a scope in the past...?

Using P-clips, you need to buy different sizes btw.

In my case I designed them to fit all, no matter how thick the wiring is.

Printing 50 of these cost me 0.56€ + a extra €-cents for the printer's heater.

nope a P-clip is something completely different.

I added a chamfer.
Before you fill up your printbed completely with these units, print just one to see if it works for you. If the zip tie does not pass trough, you need to lower ExtrusionMultiplier just a little bit.
Needles to say, you need very small zip ties....😉

wire-support-V10.stl

need the STL..?

Hey,

I also use printed units to secure all wires. Depending on the size of the bed I'll use, I print 40 or 60 in one go.
Most of the time I use screws to secure them against the cabinet of a printer or a wall, sometimes I need to glue them.

There's no need to add explanation imo...

They're very small, only 17x10x4mm. At the bottom side there's no opening for the zip to push through. Instead there's a curved cavity inside. The zip tie just needs a small curve and gently push it into the bracket, leaving it at the other opening.

Peter busy installing a few scaffoldings for the paintjobs.

Almost done...

Almost done, one more segment is printing right now..