Metal bandsaw - video

[Jon]

Metal bandsaw. By igorkawa. 15:48 video:

Previously:

Drill-powered portable bandsaw - video
Vertical metal bandsaw - videos
Metal bandsaw from bicycle wheels - video

[metric_taper]

the video skips the steps in the making of the bandsaw blade tension mechanism. Somehow the load on the threaded nut gets pushed through a piston chamber so the gauge and limit switch mechanism are actuated.
This is a very complex bandsaw build. Is there an external air supply for the pneumatic feed rate cylinder? Or is that built in. It raises up pretty fast if one of those motors is a air pump.
edit;
I see his youtube channel has additional videos on the build.
I wish I could understand his Slavic language, but in this video he shows the inner mechanism for the blade tension mechanism at 3:00 in;

[Isambard]

He wound the tension up to about 60Mpa which equates to 8000+psi. The diameter of the sensor piston attached to the tensioner was in the region of 2" so
tension in the region of 25,000 psi is possible, within the bounds of good blades, cheaper blades need a lot less.
Last century, I had a Doall horizontal bandsaw that hydraulically tensioned the blade on startup.