Spinnekop #22: De schroef

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This is part 22 in a 34 part series: Spinnekop

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

Job

That screw is an impressive build by itself!