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Telrad Base part 2

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Blog entry by RaggedKerf posted 10-15-2012 05:51 PM 872 reads 0 times favorited 4 comments Add to Favorites Watch

To see more pictures of the project, click here.

Continuing work on the Telrad base was easy—-cloudy nights=busy days.

I added a wedge to the front of the Telrad base to make it more secure when attached, shaped the whole thing and made some nice edges. I think this is just going to be an experiment in getting it done—-if I like how it handles in the field, I may make it out of oak or something more stable and solid than pine (this was all pieces of 2×4 cutoff).

I had the wooden part in the bench vise, then shaped the angles of the top to match the angled Telrad base with a block plane and a chisel (on the knots).The above picture shows it as I started to shape the angle. It took surprisingly little time! Maybe 10 minutes.

Then, I used two 1/2” wood screws I found in the junk drawer to attach the Telrad’s base to the shaped wooden base:

Finally, attached the base to the telescope using the finder scope’s cleat, then attached the Telrad for a test fit. Perfect!

Assuming everything holds up in the field, I will use this prototype to test finishes for waterproofing and painting. Once I get it all refined, I’ll likely find myself a nice piece of hardwood and make a nicer looking base. Or I may just say the heck with it and use this one!

Time will tell, but if the clouds don’t freakin’ get out of here it’s a moot point…

-- Steve http://vaughtwoodworks.wordpress.com



4 comments so far

View David Kirtley's profile

David Kirtley

1285 posts in 1749 days


#1 posted 10-15-2012 06:37 PM

If you are going for dimensional stability, I would make version 2.0 out of baltic birch or marine ply rather than solid wood. Chesapeake Light Craft usually has some bundles of small pieces pretty cheap. Then seal it with epoxy and it should do great.

http://www.clcboats.com/shop/products/boat-building-supplies-epoxy-fiberglass-plywood/marine-plywood-cedar-strips/plywood-project-pack-bundles-24.html

http://www.clcboats.com/shop/products/boat-building-supplies-epoxy-fiberglass-plywood/marine-plywood-cedar-strips/plywood%20project-pack-bundles-54.html

-- Woodworking shouldn't cost a fortune: http://lowbudgetwoodworker.blogspot.com/

View Cosmicsniper's profile

Cosmicsniper

2199 posts in 1909 days


#2 posted 10-15-2012 07:46 PM

Still very cool!

I wouldn’t worry too much about dimensional stability. It’s not a bad habit to check alignment on your Telrad each use anyway, especially if you have to setup each time. Plus, it’s not as if you are hoping for arc-seconds worth of pointing accuracy.

Now, go away clouds!

-- jay, www.allaboutastro.com

View RaggedKerf's profile

RaggedKerf

407 posts in 871 days


#3 posted 10-15-2012 11:41 PM

David: Wow—where do you find stuff like that? I never would have thought of a boat supplier! That’s an awesome idea—-even if I don’t use it for this project, I can think of lots of uses for marine grade plywood bundles like that…thanks!

Jay: Yeah, I wasn’t too worried about it until I realized that every time I took it off and on (to test it) the base had these unsightly little divots where the thumbscrew from the RA finder base was pressing in on the soft pine sides. Once it’s done I don’t plan on removing it, but I’m just thinking that over time, the stress of wheeling the dob out of the garage—-er, shop—-onto the driveway and raising the tube up and down every time I use it will wear out the wood. If it doesn’t, I’ll be happy—-if it does, I’ll have a backup plan. I’ll probably go with David’s suggestion and use marine plywood should the base start to wobble or fall apart (LOL).

Yes yes, go away clouds! I’m going through clear skies withdrawal (although it is allowing me plenty of shop time…)

-- Steve http://vaughtwoodworks.wordpress.com

View Cosmicsniper's profile

Cosmicsniper

2199 posts in 1909 days


#4 posted 10-16-2012 02:06 PM

Gotcha, Steve. I’d be inclined to leave mine on, if possible, but in portable setup it usually needs to be removed. i’ve actually broken two of them because I banged them around somehow. YMMV…I’m clumsy. :)

Like David mentioned, Baltic birch is great for this kinda stuff…and I like the look of it. I know people who have made their own scope rings with it, and many of us will use it to make mounting plates to bolt on our imaging systems for various hubs, motors, power supplies, and cables.

-- jay, www.allaboutastro.com

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