DEC H960 stabiliser feet. Have some questions. - test-drb@ccmp.vtda.org

8 Jan 2018

...
  From: Steven Malikoff 
...
  That's the first actual photo I've seen of the
foot, and I see what you
 mean. 
Oh, I can take more, then; let me know what you need.

...
  Let's regard the inner vertical surface where it
mates to the rack as
 the normal surface. 
Right; that's our reference plane.

...
  If you have a length of something straight .. clamp it
with a .. clamp
 to that inner surface 
Umm, not possible. There are two diagonal (in the horizontal plane) ribs
coming off that surface, so there's no way to clamp anything vertical to
it. The _front_ (outer) surface, parallel to the reference plane, I could get
to (and the clamp is a good idea). Here's what I wound up with:

  http://ana-3.lcs.mit.edu/~jnc/tech/jpg/StabilizerMeasurement.jpg

(Yes, yes, I know, tha assumes the back face of the square is parallel to the
front; it is, pretty much - I checked with a vernier calipers.)

So the vertical distance from the horizontal plane at the bottom of the
stabilizer, at its tip, to the bottom of the 'outer surface' (as above), is
17/32". The distance from the plane of the 'outer surface' to the end of the
stabilizer is 7-9/16". The distance between the reference plane and the 'outer
surface' is 7.14mm (one thing I _could_ get a vernier calipers on :-).

Also, it turns out the right-hand vertical face of the stabilizer is _not_
perpendicular to the reference plane! The foot angles in slightly. The outer
vertical surface is a plane along its entire length, so it's hard to notice
unless you put a square on it directly:

  http://ana-3.lcs.mit.edu/~jnc/tech/jpg/StabilizerAngled.jpg

(Sorry about the lens distortion; wanted to show that the square was along
the reference plane.)

I couldn't get anything clamped on to make the measurement, but the tip of
the stabilizer is about 1/2" (to a /32nd, or so) in from a vertical plane
perpendicular to the reference plane, and situated at the right-most location
on the foot (i.e. along the edge of the square, in that photo).

...
  A pencil rubbing on paper, or paper creasing slong
eges then drawn over
 with a ruler can also help to get angled surfaces. 
Sorry, couldn't figure that out?

...
  Another thing, CAD can make good use of
non-perpendicular measurements.
 So if you're able to measure something across a diagonal or at some odd
 angle, then please do so. It can be used to triangulate and improve
 other taken measurements, like a point cloud. 
What other measurements should I take?

One easy/obvious one is from the right-hand outer bottom corner of the
stabilizer to the left-hand bottom corner of the reference plane: that's
8-9/32". (A lot of these corners are rounded, so exact measurements are a
matter of choice....) The top inner corner of the right-hand face is 9-11/32"
...
 from the bottom outer corner of that face (same corner
as above). 
	Noel