corydoras style Parallel Clamps

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Project by comboprof posted 06-10-2014 02:29 PM 2785 views 5 times favorited 4 comments Add to Favorites Watch

Here are photos of my first clamp based on the corydoras plans which I purchased. Because of the material I had available I reduced the plans by about 2/3. I used an acorn nut instead of grinding a nut round as was shown in the video. I used some left over 1/2 inch conduit (4 feet) which has O.D. of 0.71. Unfortunately my closest Forstner bit was 3/4 =0.75 inches and so there is a little bit of play which results in the clamp being out of parallel by 0.56 degrees. Now that I understand the issue I can correct this when I build sister clamps. Otherwise it works fine and was easy to build. Wood is hard maple, 1/4 AC plywood, birch doweling. The threaded rod is 3/8 inch diameter with 16 t.p.i . The wood and pipe were from the scrap pile. The threaded rod and nuts cost in total about $3.50. I should mention corydoras was responsive to my questions and easy to talk to.
I thank him for this idea.

-- -- Cheers, Don K. (Michgan's Kewenaw peninsula)

4 comments so far

View OldWrangler's profile


731 posts in 1013 days

#1 posted 06-10-2014 03:11 PM

Maybe you can cut a bushing out of 1/2” thin wall PVC (or maybe you would need the Schedule 40 PVC) for the loose conduit. There should be a way to tighten it up.

They look good and very serviceable.

-- I am going to go stand outside so if anyone asks about me, tell them I'M OUTSTANDING!

View comboprof's profile


277 posts in 1153 days

#2 posted 06-10-2014 04:27 PM

Thanks OldWranglwer I did not think of a bushing. I was thinking a set-screw at the far end of the slider might work. Of course when I build the sister clamps I can take this issue into account a priori to the build.

-- -- Cheers, Don K. (Michgan's Kewenaw peninsula)

View Ken90712's profile


16863 posts in 2607 days

#3 posted 06-10-2014 04:48 PM

Great work, awesome build and very useful.

-- Ken, "Everyday above ground is a good day!"

View corydoras's profile


111 posts in 1915 days

#4 posted 06-10-2014 07:48 PM

Very nice comboproof
I am glad it worked out for you:) They look great.
I liked the acorn nut idea


-- ->Growing old is mandatory, Growing up is optional-<

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