Another chalenge

Hotspur · 9th June 2014, 06:53 PM

The spoon type with a lead screw, as the one you show, was often used in large mortise and tenon work. The auger removing a lot of the pocket and then chisels to square the mortise. The T handle and other pointy blade next to that in the linked picture are of your type.

Smaller modern mortising drills have a twist drill within a square tube acting as a four sided chisel. Large scale post&beam work is still often done the old way with a spoon auger. With wooden boat building, the round pocket in the beam, with pegs holding the planks.

Cheers

GC

fernando · 9th June 2014, 07:44 PM

Alright, duly noted ... and much obliged.
One of these days i will have a look in next town Naval Construction Museum (3 miles distant), to check whether they have this type of tool.

fernando · 15th June 2014, 03:34 PM

Someone came around and finally the mistery is solved.
Let me try and explain ...
Imagine a sort of chain, praying rosary style, with its beads. Then consider breaking the rosary, introducing it in a tube, where the beads fit precisely its interior diameter. After that, you introduce the tube in a water container and start rotating the rosary in the sense that the beads go up the tube. The result will be that the water is transported to the top, in quantities retained inside the beads interval.
That is the principle of water pumping in which this auger is used; for drilling a hole through a pine trunk where the beads (cork plugs) elevate the water, tractioned by some crank & handle resource.
No wonder this pumping system is called rosario (rosary) or de contas (beads).

.

15th June 2014, 03:34 PM	#3
fernando (deceased) Join Date: Dec 2004 Location: Portugal Posts: 9,694	Someone came around and finally the mistery is solved. Let me try and explain ... Imagine a sort of chain, praying rosary style, with its beads. Then consider breaking the rosary, introducing it in a tube, where the beads fit precisely its interior diameter. After that, you introduce the tube in a water container and start rotating the rosary in the sense that the beads go up the tube. The result will be that the water is transported to the top, in quantities retained inside the beads interval. That is the principle of water pumping in which this auger is used; for drilling a hole through a pine trunk where the beads (cork plugs) elevate the water, tractioned by some crank & handle resource. No wonder this pumping system is called rosario (rosary) or de contas (beads). . Attached Images

9th June 2014, 06:53 PM	#1
Hotspur Member Join Date: Jul 2009 Location: Nipmuc USA Posts: 523	The spoon type with a lead screw, as the one you show, was often used in large mortise and tenon work. The auger removing a lot of the pocket and then chisels to square the mortise. The T handle and other pointy blade next to that in the linked picture are of your type. Smaller modern mortising drills have a twist drill within a square tube acting as a four sided chisel. Large scale post&beam work is still often done the old way with a spoon auger. With wooden boat building, the round pocket in the beam, with pegs holding the planks. Cheers GC

9th June 2014, 07:44 PM	#2
fernando (deceased) Join Date: Dec 2004 Location: Portugal Posts: 9,694	Alright, duly noted ... and much obliged. One of these days i will have a look in next town Naval Construction Museum (3 miles distant), to check whether they have this type of tool.