Wednesday, November 26, 2008

What is Love?


My wife bought me a Miller TIG welder as an anniversary present.  I love her very much. 

Happy holidays!

Monday, November 3, 2008

A Sunday Project


This is what I did yesterday.  In total, it was about 6 hours of work.  This is my first project in stainless steel and I was a bit nervous after having read of the problems others have had.  I'm releived to say that it wasn't as bad as I expected.  I did shatter two carbide inserts threading the external threads.  However, the trick seems to be to take very light cuts.

The brazed in tubes are new to me also.  The braze material is a Silver with Nickel alloy from McMaster.   Torch brazing them wasn't much harder than pipe soldering although you do have to be carefull about burning the flux.


Saturday, November 1, 2008

Valve Speed

Some one asked how fast the valves move with these actuators.    I did a test this morning with a 6 cell NiMH battery.

Here is a full speed video of an open/close cycle with no pressure:


video

Here is the same video at quarter speed:

video

Here is a quarter speed video of a second test at 750 psi line pressure:

video

With no pressure, the average frame count of the open and close was 8.5 frames which corresponds to 0.283 seconds/90 degrees

With the 750 psi line pressure, the frame count was 9.5 frames, or 0.317 seconds/90 degrees.