LumberJocks

Pair of prototype, thin, deep throat C-clamps

  • Advertise with us
Project by Dave Rutan posted 01-12-2017 02:04 AM 1464 views 0 times favorited 7 comments Add to Favorites Watch

These two clamps are an experiment to make light duty deep throat luthier clamps. I was hoping they could at least be used to hold down the bridge plate of a guitar, but in that regard they also fail. I need to open them up a bit to do that.

However, they can be used to hold the edges even on a violin top to repair cracks, so not a total fail, just not quite as useful, but they look cool.

They are made from 1/2 inch thick drawer wood, possibly oak. The joinery is half laps with through-dowels. The eye screw runs in a threaded hole in the wood, no metal nut. As I said, these are for light pressure, not for straightening my car frame. If used for musical instrument repair they would definitely require a caul on the screw part.

I finished these with boiled linseed oil.

-- Ni faru ion el ligno!





7 comments so far

View nomercadies's profile

nomercadies

585 posts in 2000 days


#1 posted 01-12-2017 05:25 AM

The part of any home made clamp that has bothered me the most has been the swivel head at the end of the screw part. I see you haven’t attached one on your clamps yet. I’ve seen lots of ways people do it, but none have been satisfactory. Most are clumsy and grind in the area of pressure. Signed, frustrated.

-- Chance Four "Not Just a Second Chance"

View Charlie Kilian's profile

Charlie Kilian

34 posts in 279 days


#2 posted 01-12-2017 05:25 AM

Nice clamps! What did you use for the pads on the side opposite the eye screw?

View majuvla's profile

majuvla

10381 posts in 2529 days


#3 posted 01-12-2017 10:06 AM

Those look nice. I’m planning to make some but still searching for more information, from other LJs about how to make them with more strenght.

-- Ivan, Croatia, Wooddicted

View Dave Rutan's profile

Dave Rutan

1593 posts in 1849 days


#4 posted 01-12-2017 12:44 PM


The part of any home made clamp that has bothered me the most has been the swivel head at the end of the screw part. I see you haven t attached one on your clamps yet. I ve seen lots of ways people do it, but none have been satisfactory. Most are clumsy and grind in the area of pressure. Signed, frustrated.

- nomercadies

I thought of a few solutions to the swivel head dilemma. One was a sort of small wooden cup made from a piece of dowel. I glued a flat, wide rare earth magnet in the cup so that it would stick to the end of the screw. It sort of worked, but the magnet didn’t hold on as strongly as I’d hoped.

The other idea is to use a cap nut. If I leave a few turnings of the thread on the end of the screw and file away enough, the cap nut could be screwed on beyond the few threads. Inside the cap nut I have the thread stops so the nut would be trapped on by the remaining thread, yet would turn freely when tightened. So far this part is theoretical only. A caul would still be required against the metal cap nut.

-- Ni faru ion el ligno!

View Dave Rutan's profile

Dave Rutan

1593 posts in 1849 days


#5 posted 01-12-2017 12:46 PM



Nice clamps! What did you use for the pads on the side opposite the eye screw?

- Charlie Kilian

The pads are a piece of wine bottle cork that I carved down and glued onto the wood. For something like a guitar this wouldn’t be enough because of the braces within the instrument, but for surface work it would be okay.

-- Ni faru ion el ligno!

View Dave Rutan's profile

Dave Rutan

1593 posts in 1849 days


#6 posted 01-12-2017 12:55 PM



Those look nice. I m planning to make some but still searching for more information, from other LJs about how to make them with more strenght.

- majuvla

These are basically to just take the place of a pair of human fingers holding a patch or something on while glue dries. To make them stronger you could make the joint with a finger joint and add a threaded rod running through along the inside of the spine. The video below shows how John Heisz builds his latest, strongest clamp ever.


View on YouTube

-- Ni faru ion el ligno!

View helluvawreck's profile (online now)

helluvawreck

26322 posts in 2528 days


#7 posted 01-12-2017 03:14 PM

You did a nice job on these clamps.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com