http://www.swissheritage.org/SHV/Cider_Press.html

and while you're at it go ahead and take a gander at the old church
http://www.swissheritage.org/SHV/Church.html

OMG.

Thats a bit bigger than I was planning.

http://m.youtube.com/#/watch?desktop_uri=%2Fwatch%3Fv%3DGIsKYXS2bgQ&v=GIsKYXS2bgQ&gl=AU

yes, but the macro-engineering can help to illustrate things that are harder to see on more 'normal' examples

Hi DLB,

Have you thought about holding your Swiss framing teachathon at the Swiss Heritage Museum in Indiana? This type of venue would generally welcome an event like you are proposng.

Jack Sobon and Dave carlon hold similar Shaker style events at Hancock Shaker Village and Joe Thompson runs English scribe classes at The Weald & Downland Open Air Museum.

Regards

Ken Hume

Great video, thanks for posting.

Searching for wine press instead of cider press I found this great set of links:

http://larsdatter.com/winepresses.htm

There are two styles that I'm interested in. One is the two screw style that I'm familiar with from 18th century pictures and the screw and lever style that is the same design as depicted in the video posted several posts ago.

My original design was of a single screw press and while I have found some early pictures of them the two screw presses and screw and lever presses seem to be more suitable for the period which I'm interested in, 14th-16th century.

The problem I'm having with the design is not the rupture of members or excessive bending it is the shear at the joints which is dictating huge timbers.

It may be that I'm just trying for too much pressure. Something I have learnt from experience is that the press does NOT get the juice out of the apple. The mill gets the juice out of the apple. The press gets the juice out of the pomace (pulp). Given that I'm thinking that the pressures I'm after may be excessive. Also if I'm developing my pressure from one or two wooden screws (instead of cheating with a hydraulic jack) then it is likely that the screws will bind before the press members break if I size them based on what looks right from my eye and the pictures.

Still comes back to shear though. Bending and rupture I feel I have my head around. Shear is still hazy.

I have though about another way of approaching this hole deal.

Different types of screw can take different amounts of force before they bind or die. Sqaure thread can take more than triangualar thread. Ball threads much more than square threads. Engineering supplies list different types of screws and the forces that they can cope with.

So how are these limits calculated and can we make the same calculations with wood threads. The problem for me is that I suspect that the calculations will come down to shear again.

So I've decided that I want to build the lever style of press that was posted in the video earlier as I have found pictures of them from as early as 12th century.

I reckon that the member that is going to have the most force on it is going to be the lever itself. Everything would then be sized around that.

Here is a simplified version:

http://i1222.photobucket.com/albums/dd481/Weaverofduart/pressbeam.jpg

I'm not concerned about deflection but I obviously don't want it to break so everything else is important. Unfortunately I'm at a bit of a loss to calculate everything except deflection.