[TheForge] Side-loading question (was: 15Ton Press)

Thu Jan 17 14:42:01 2002

I've gotten two "yes" responses.  So let me continue.

Suppose you had to construct a press that would not let its cylinder get =
side loaded (and for the moment $ is not an issue).  It seems to me that a =
fairly straight-forward "suspension" system could be used to avoid =
side-loading.

For example, suppose you build a press using three hydraulic cylinders =
arranged in a triangle.  These would be connected at three points to the =
ram.  In principal you could run the three of them from a single pump (but =
you might want some sort of slip-linkage to keep one from getting ahead of =
the other two due to lower friction).  When one cylinder encounters =
resistance (more than frictional) the pressure will tend to rise within =
that cylinder, which will tend to keep it from receiving more fluid until =
the pressure in the other two cylinders rises equally.  If each cylinder =
were mounted on a sort of a ball and socket joint (loosely interpreted), =
then it seems to me that none of them would ever receive any side loading.

This may not be the best way to implement such an idea.  I can think of =
other ways to accomplish this hydraulicly (if that's a word), but the =
principal would remain the same.  I'm not trying to say this would be cost =
 effective.  I wouldn't know about that.

Just a thought.

Bruce
NJ

>>> "Bruce Freeman" <[email protected]> 01/17 10:13 AM >>>
I've been following this and related thread only intermittantly, since I =
have no plans to build a press.  I was wondering, however, whether I'm =
understanding properly this question of side-loading. =20

If I envision it correctly, you're speaking of a press driven by a single =
hydraulic cylinder.  If the work being "pressed" is totally flat, no =
problem.  But if the work is not flat, the cylinder shaft and/or piston =
can be subjected to a side-load.  Do I have this right?

Bruce
NJ

>>> <[email protected]> 01/17 9:52 AM >>>

ed,

glad you got to see the video. he makes quick work of that bowl doesn't =
he? also he uses no ram guides but stresses that the cylinder rod be large =
enough to take the side load. i think keiths rod is 4" dia. if i ever get =
around to building a press it will be just like keith johnsons. i think he =
used batsons book for basic info but not build plans.

btw i got batsons H frame plans and could not imagine forging upside down. =
this dog is too old to learn that trick. low center of gravity? isn't =
everything. what's the point?

bob s.

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