10" Truss Dob Build

[10,000rpm]

Gong Xi Fa Cai!

I have "inherited" Arief's 10 inch f/6 Swayse mirror and Keyheem's unfinished truss dob project.

For the latter, these include the 2-piece PVC tubing, 6inch plastic alt bearings, University Optics cell, 2 inch Crayford focuser.

Carrying on from where Kayheem left off, my scope will have a 3 truss design.

I will post a sketch of what I have in mind for the truss which is a flat stainless steel or brass strip of sufficient rigidity and each with 2 mounting points on the lower tube and one on the UTA.

Marine ply will be used for the side boards and base so that it can take the 2-pack Spies Hecker paint job which a friend of mine will do. Thinking of deep red/maroon finish.

I am currently sourcing for a secondary mirror which I know i should get a good one so as not to compromise the primary mirror. I understand I need a 2 inch one and I am thinking of the one from Scope Stuff with enhanced coating and claimed 1/10 wave. Any idea if these are good enough?

[VinSnr]

Gong Xi Fa Cai!

I have "inherited" Arief's 10 inch f/6 Swayse mirror and Keyheem's unfinished truss dob project.

For the latter, these include the 2-piece PVC tubing, 6inch plastic alt bearings, University Optics cell, 2 inch Crayford focuser.

Carrying on from where Kayheem left off, my scope will have a 3 truss design.

I will post a sketch of what I have in mind for the truss which is a flat stainless steel or brass strip of sufficient rigidity and each with 2 mounting points on the lower tube and one on the UTA.

Marine ply will be used for the side boards and base so that it can take the 2-pack Spies Hecker paint job which a friend of mine will do. Thinking of deep red/maroon finish.

I am currently sourcing for a secondary mirror which I know i should get a good one so as not to compromise the primary mirror. I understand I need a 2 inch one and I am thinking of the one from Scope Stuff with enhanced coating and claimed 1/10 wave. Any idea if these are good enough?

Get a Antares secondary mirror. For a Swayze mirror, get at least a 1/20 wave secondary mirror.

[10,000rpm]

Thanks VinSnr.

Antares does not list a 2 inch elliptical and I have enquired with them about it. Apparently they guarantee their wavelength claims which I am glad to see.

Below are the various parts that I have so far [mirror is kept safely away] and I will post updates as I go along.

[weixing]

Hi,
The size of the secondary is all depend on your design... basically the distance from secondary mirror to focal point of your design and the fully illuminated image size of your choice will determine the size of your secondary mirror.

Below is a link to a software to help Newtonian design:
http://www.dalekeller.net/ATM/newtonian ... wtsoft.htm

Happy building and have a nice day.

[10,000rpm]

Yes I have used the Newt software n the results came out "None" for all issues and stating 2 inch for the secondary.

I forsee my biggest issue being the balance of the scope which I will find out when it is more or less done.

[VinSnr]

Yes I have used the Newt software n the results came out "None" for all issues and stating 2 inch for the secondary.

I forsee my biggest issue being the balance of the scope which I will find out when it is more or less done.

Possible to use a 1.83"? Without trying the software, I think it is possible...but may have to use a low profile focuser.

[10,000rpm]

Yes I hope I can use a 1.83. Will make a ray trace and check it out as suggested by Kayheem.

[weixing]

Hi,

Yes I hope I can use a 1.83. Will make a ray trace and check it out as suggested by Kayheem.

I also think that a 1.83" secondary mirror should be possible since the focuser you had look like a low profile one.

Have a nice day.

[rlow]

1.83" is more than big/bright enough for yours at 10" f/6, as it is also used for 10" f/5 dobs. 2.14" would be a little too big.

I would recommend you to get the Protostar ULS quartz secondary mirror, in my opinion, rather than the Antares version. Both are good, nevertheless.

[10,000rpm]

Thanks Richard. I have checked the Protostar website but it does not seem to state the wave PV. Other than that, it sounds impressive and apparently, Carl Zambuto's choice.