Re: [CAD_CAM_EDM_DRO] MSA 665 linear Encoder

----- Original Message -----
From: "Thomas" <teecee@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, November 24, 2005 11:08 PM
Subject: [CAD_CAM_EDM_DRO] MSA 665 linear Encoder


> Hi Tim
> I figured it out, that part is working nicely !
>
> What I want to do is plot a profile from a small Camshaft into Solidworks
either Directly from X & Y Coordinates using a Linear and Rotary Encoder and
just left click to create the point in CAD then join the Dots with a spline.
> Taking this a step further I took a cheapo Serial PS2 PC mouse apart and
started messing around inside with the X & Y axis and connected the 2
Encoders and the Cursor moves nicely.
>
> Does any one now of any open source Drivers or a suitable program for the
Humble ol Mouse or this type of interface ?
>
> I will need to set this up so the Encoders have a Scaled or known movement
on the screen the Rotary Encoder is 360 PPR and the Linear Encoder has a
Grating of 0.04mm ?
>
> Would this be accurate in Windows ?
>
> any thoughts
>
> Thankyou
> Thomas
>
Thomas
I certainly have some thoughts on the subject.....I think you are doing
what I want to do..Actually , I think what you are doing is very important
work that somebody needs to do and make available to us types who havent the
interest in developing our own electronic circuits and software....Lemmee
tell you my application and idea conception - see if this dont parrallel
your own ideas..
.
Just about all my machineshop work involves either copying an existing
part or making a part to fit an existing part or welding up and recutting an
existing part....
.
.For sake of explanation I'll use a lever from a lever action rifle as an
example..We want to make a quick replacement and we have one to
copy....Digitizing is slow.. Mach 3 Wizard 'Teach and Learn' does work -
takes me about 20 minutes to 30 minutes to jog around and map the
coordinates and check for errors...............This I believe is best
currently available method for quick coordinates mapping.
.
...What would be far better would be to have a coordinate measuring machine
of sorts sitting to the side dedicated to mapping coordinates of lines
,radius and hole patterns..This CMM would be in shape of small vertical mill
without having any lead screws.Table moves freely with human force
alone......... Clamp sample workpiece to tabletop , lower carbide stylus in
quill down to edge of sample and then push table in X and Y directions so
that stylus follows outside the lever and inside the lever loop --- taking
mere moments. Change stylus to 60 deg. V point - drag table over till pivot
pin of lever is under V point and pressing down the quill - the V point
enters hole and pulls the table into perfect alignment with the
hole.....All coordinates being recorded , you then in good shape to step
over to big mill and replicate the sample part or use the coordinates to
work up a mold or dieset.
.
If anything is wrong with this idea it would be that such a unit would not
be capable of extreme accuracy so would not do for some applications..That
being because of compromize in setting gibs loose enough to move with just
human power...But in the real world of hobby shop or maintenance/repair
shops and a lot of mold shop work , the accuracy that machine would be
capable of would be well adequate.
.
Dunno if anybody else would spring for one but I want one.
Steven



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