Last part was a very simple part. Now lets make the most difficult and challenging part of this mill: the "schroef" or "vijzel". A Archimedes screw.
Lets start with a simple "beam"
Now turn it on the lathe
And then i realize that i made the round parts to small…....
Time to make a new one.
A quick test fit to see if the barring surface is in the right spot
Adding little metal strips called "schenen" to make the bearing surface more durable
Adding metal bands to keep everything in place
Now lets layout the screw
The screw has 3 "gangen" (compartments). So I divide the circumference in three and add a string to give me the place of the line i need.
Scribing the rebate with a compass
Now i can begin making a rebate
Adding the bottom bearing
Adding a nail as start of each compartment called "slag ijzer" (beating iron)
This iron is placed so any driftwood floating into the screw will not damage it.
Some calculations to get the dimensions of the segments that make up the compartments
These are very small pieces with a tenon on a angle
And now the fun part: adding all the segments…
First a bit of a dry run.
Now let use some glue
Keeping things nice and square
Start the sanding
Making the outside round
Test fitting it to the "schroefbak"
Needs a bit more
Fitting the bearings
Adding the "schroefrad"
All finished