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Project by kiefer posted 11-15-2015 08:28 PM 2338 views 3 times favorited 20 comments Add to Favorites Watch

I have a lot of ” F ” clamps but they only to to about 12” opening and I think I finally came up with a solution to quickly fasten two together end to end . A couple of Baltic birch plywood pieces and four bolts to make the coupling and grind of the burr at the end of the clamp to remove the moving jaw and install a new bolt as a retainer for the jaw which allows me to install the jaw either way .
What I like is that the whole clamp assembly is fairly ridged when the adapter is tightened and is easier to handle the two clamps hooked together and I can use the clamps still in either configuration (single or tandem )
Here are some pictures of making the coupler .

Grinding off the burr and the tapped hole for the retainer bolt

Marking out the bolt hole locations with the bolts against the clamp bar

Marking the hole locations with a sliding square to ensure even alignment and marking the centres with an awl.

The two plates taped together to ensure good alignment of the bolt holes .
Drilling the stepped hole starting with a forestner bit to lightly counter sink the bolt head and then driiling the hole about half way to just mark the second plate using a bit slightly larger then the bolt size .

Drilling the holes that get tapped for the bolt thread and tapping the thread with a shop made tap made from a bolt and coating the wood threads with ” CA ” glue to strengthen .

The bolts are nice and tight against the bar and jaws and time to bolt it up to the threaded plate .

The complete assembly on the left and this is simply slid onto the clamp jaws and tightened when in place and the clamp adaptor installed on the two clamp jaws on the right .

The clamp test and I thought I would add a little extra pressure by tightening the handle using a pair of water pump pliers but not too much and my shop dog thinks its strong enough .
Well not bad for a proto type and I will report if any issues develop after I use them on my next project .

Comments and questions always welcome .


-- Kiefer

20 comments so far

View drewpy's profile


806 posts in 1409 days

#1 posted 11-15-2015 08:41 PM

Nice idea Klaus. Thanks for sharing the details. I think I ‘ll add this to my winter project list!!

-- Drew -- "The greatest wealth is health".

View HuckD's profile


311 posts in 1766 days

#2 posted 11-15-2015 08:47 PM

Good idea! Thanks for sharing.

-- Visit my Youtube Channel:

View Dutchy's profile


3008 posts in 2220 days

#3 posted 11-15-2015 08:59 PM

View Andre's profile


1922 posts in 1858 days

#4 posted 11-15-2015 09:12 PM

Looking good, I really could’ve used some longer clamps on my Bench build, ended up buying some longer pipes for some pipe clamps that were kicking around.

-- Lifting one end of the plank.

View stefang's profile


15881 posts in 3386 days

#5 posted 11-15-2015 09:23 PM

You are always coming up with brilliant solutions Klaus, and this is one of them.

-- Mike, an American living in Norway.

View  woodshaver Tony C   's profile

woodshaver Tony C

6035 posts in 3405 days

#6 posted 11-15-2015 09:49 PM

I see your thinking out side the box again Klaus! Good idea you have there! Brilliant work as always!

-- St Augustine FL, Experience is the sum of our mistakes!

View DocSavage45's profile


8639 posts in 2894 days

#7 posted 11-15-2015 11:58 PM

Problem Solved!

-- Cau Haus Designs, Thomas J. Tieffenbacher

View woodbutcherbynight's profile


5233 posts in 2461 days

#8 posted 11-16-2015 12:08 AM

Nice solution.

-- Live to tell the stories, they sound better that way.

View hoss12992's profile


4046 posts in 1945 days

#9 posted 11-16-2015 01:04 AM

That is a great idea. Great job buddy and very creative

-- The Old Rednek Workshop

View Jim Jakosh's profile

Jim Jakosh

20743 posts in 3157 days

#10 posted 11-16-2015 01:05 AM

Klaus, you are so inventing. I’d say you are the Lumberjocks “McGyver”

Cheers, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View doubleDD's profile


7487 posts in 2095 days

#11 posted 11-16-2015 01:20 AM

There are those rare occasions when you need a longer clamp. This is a great solution. Nicely detailed with pictures. Fine work Klaus. I could of used this a month ago.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View shipwright's profile


8005 posts in 2850 days

#12 posted 11-16-2015 03:45 AM

It works, it works with what you already have in the shop, it’s virtually free ….
........ hits all the main food groups for me. ;-)

Well conceived my friend. You’ve done it again.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

View CFrye's profile (online now)


10279 posts in 1892 days

#13 posted 11-16-2015 03:59 AM

Well thought out and done. Klaus. I’ve been in that situation where the clamps on hand were just not long enough. Thanks for sharing.

-- God bless, Candy

View MontanaBob's profile


831 posts in 2736 days

#14 posted 11-16-2015 11:45 AM


View helluvawreck's profile


31681 posts in 2918 days

#15 posted 11-16-2015 02:47 PM

That’s a great idea, Klaus. It certainly fits right into the idea that nobody has enough clamps/ Congratulations.

helluvawreck aka Charles

-- helluvawreck aka Charles,

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