Re: [CAD_CAM_EDM_DRO] Re: axis naming conventions

Doug...I heard that rule in school!

I've been a machine designer for more years than I care to remember, so I
have a pretty good idea of what the X Y & Z axes are. None of them have
changed....only people's INTERPRETATION of which is which.

For instance: You have a vertical knee type milling machine with an X Y & Z
axis. The X axis goes from left to right (standing in front of the machine
loking at it)parallel to the floor, the Y axis travels 90 degrees to the X
axis and is also parallel to the floor. The Z axis is vertical travel of
the mill quill.

So, you mount a small lathe on the mill table with the centerline of the
spindle and tailstock parallel to the X axis on the mill table. Now you
disconnect the X & Z axis of the mill. Now you have a lathe that will
travel up and down in the Z direction due to being mounted on the knee.

Now your lathe won't work because the lathe cutting tool is on the wrong
(Y) axis. Or course you could reconnect the quill axis and mount the lathe
tools in the quill.

:)


LIke I said earlier......(read it)

Smoke



-----Original Message-----
From: Doug Harrison <prototype@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Tuesday, November 21, 2000 8:21 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: axis naming conventions

>
>----- Original Message -----
>From: Smoke <Smoke@...>
>
>> I have a solution that suits me....and this applies to ME ONLY.... when I
>> build MY machines, I'll call each axis by what I want to call them. As
>long
>> as control electronics and I use the same terminology, I won't have any
>> problems.
>>
>
>Smoke;
> I taught machine shop at the local college and have a method that should
>help you remember the XYZ thing.
>
>1. Hold your right hand out like it was a pistol with your first finger
>pointing forward (the barrell) and your thumb pointing up (the hammer).
>
>2. Extend your middle finger so it is at right angles to the thumb and
>first finger. The middle finger should be pointing to the left.
>
>3. Call the first finger X, the middle finger is Y and the thumb is Z.
>
>4. You can move the axes around and call the thumb or middle finger X if
>you follow one basic rule. X, Y and Z proceed counterclockwise around the
>extended digits. Thus if you select the thumb as X then the first finger
>will be Y and the middle finger Z.
>
>This is called the right hand rule. X,Y,Z - Y,Z,X - Z,X,Y...............
>always counterclockwise. Now align your hand with the axes of the machine
>and you will find it easier to determine machine coordinates. You can
>rotate your hand as needed as long as you follow the above rules. Always
>works!
>
>Doug
>
>
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