Re: Probing

[Carl Mikkelsen <cmm-at-alum.mit.edu>]

Dean,

I have a probe tip on my Stewart Platform 6-axis machine.  Could we
consider adding rotation axes as well?  P (pitch, about the X axis), R
(roll, about the Y axis), and W (yaW, about the Z axis).

So far, I'm not using the probe tip to sense forms, but instead to set the
Z-axis reference for accurately carving into warped wood.  One day, though,
I hope to get involved in creating "point clouds", and fitting surfaces to
them.

-- Carl

At 05:35 PM 1/12/02 -0500, you wrote:
>
>Ray & Others...
>
>I am just about finished my probe switch and have starting
>looking into the probing script.
>
>The thought occured to me that maybe it would be a good idea
>to spec out a "point cloud" file format.  I think this might be a good idea
>since further proccessing of this information into usable g-code may
>vary depending on other factors.
>
>In addition, I thought it would be nice to divide the file into two
>sections.  "Probe Setup"  and "Aquired Data".
>One could then fill out the "Probe Setup"  portion of the file
>and then allow a script/program to execute and then fill out
>the "Aquired Data" section.  The result would be a single file
>describing the entire probing operation.
>
>The first section describes the nature of the probing 
>setup.  It specifies the region(s?) to probe, some sort of
>description of the probe switch/tip.  The "granularity"
>of the probing grid etc..
>
>So here's my first shot at it.  Chime in if you think I am
>going down the wrong road with this or you wish to make
>any suggestions.
>
>BTW, I am assuming a 3-axis machine here.
>
>[Probe Setup]
>Units= (in/mm)
>TipStyle= (Round, Cylidrical, etc..)
>TipDiameter= nn.nn
>
>[Region 0]
>Start_x=nn.nnn
>Start_y=nn.nnn
>Start_z=nn.nnn
>Min_x=nn.nnn
>Max_x=nn.nnn
>Min_y=nn.nnn
>Max_y=nn.nnn
>Min_z=nn.nnn
>Max_z=nn.nnn
>Granularity_x=
>Granularity_y=
>Granularity_z=
>
>Probe_Axis= x,y or z this is the axis of a single pass across the model
>
>Probe_Method= ""back and fourth" or "unidirectional"
>
>Probe_Algorythm= 0  
>#zero for now, but allows for "smart" probing techniques to be later 
>#deployed. i.e, interpolation to minimize probe z travel etc..
>
>Probe_Traverse_Speed=
>Probe_Z_speed=
>
>[Region 1]
>.
>.
>.
>
>[Region n]
>.
>.
>.
>
>
>[Aquired Data]
>[Region 0]
># The aquired data consist of standard G-code xyz coordinates i.e
>ynn.nn ynn.n znn.n
>.
>.
>.
>
>[Region 1]
>.
>.
>.
>
>[Region n]
>.
>.
>.
>
>
>
>Thats it for now.
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