|Project by kiefer||posted 11-15-2015 08:28 PM||1845 views||3 times favorited||20 comments|
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 .