Re: Mori Seki SL1 NC lathe programming

On 19 May 2006 20:22:59 GMT, D Murphy <spamto154@xxxxxxxxxxx> wrote:

Cliff <Clhuprich@xxxxxxx> wrote in
news:c02r62l5hrvi3r9e56hdd7gjolq6o8c391@xxxxxxx:

On 18 May 2006 21:46:10 GMT, D Murphy <spamto154@xxxxxxxxxxx> wrote:

Cliff <Clhuprich@xxxxxxx> wrote in
news:ofeo62llnivegk99n9n96ta1scjsi1f1lk@xxxxxxx:

Except that you are using full TNR comp & the machine is
calculating it for you.

Nope. You can touch off the way Tom instructed, comp for the radius in
the program and not program from the center of the radius. For the
life of me I don't know why you can't see how that's possible.

Consider the point that the machine's control is moving in
the machine's internal coordinate system.
It's offset from the intersection (often the centerline of the
turret)
by offset values in X (radius, usually) and Z. Or it's just the
machine's axes intersection point .....
This is the location it's really interpolating.

Huh??

Check it out. What point did you think the machine was driving?

BTW, Tom used NO TNR value ANYWHERE. YOU are using it
(or claiming to).

Again, you are so confused this has become a giant waste of time. Tom
only gave instructions on how to touch off the tool.

One way. After that there's machine code, right? Based on the zero point
he set ....

Here is a little sample for you to contemplate. The tool has been
touched off in the manner described, X is a diametrical designated
axis.

Let's use radial from now on for these discussions.

No. Muliplying by two isn't all that difficult.

Neither is keeping thinking if a cartesian coordinate system
for the sake of discussions.

Plus any CNC lathe made
in the quarter century uses diametrical programming.

AFAIK most can use either.

Lets say we are going to turn a taper from the face of the bar, moving
away from spindle centerline as the Z moves away from the face of the
bar toward the chuck, the end tangent point is the O.D. of the bar.

So we need to compensate for the radius in the X axis at the face and
in Z at the end of the taper. Here is the math:

Well call the taper angle @ (off of parallel of the length of the bar)

We'll call the supplementary angle $ (Off the face of the bar)

We'll call the compensation f.

2fX=2R(1-Tan$/2)
fZ=R(1-Tan@/2)

OOPS !!!
I SEE AN R VALUE IN THERE !!!

Duh!

Your claim is that you have to program from the center of the radius.
You don't. No one, not once in this whole thread claimed that you do not
need to compensate for the tool nose radius.

Tom did not seem to be doing so in his setup instructuions. Hence
in each & every block of code ....

Or are you saying that Tom has to do all those added calculations
for each block of code?

Added calculations? So are you saying that if Tom simply sets the
coordinates to the center of the tool radius you can then just program
dimensions right off of the print? Whacky.

Nope, you program to the offset curve. For each arc or linear move;
it would seem to be a bit easier than to try all the kludges needed
otherwise in the general case.

See it now?


You used an R value. Tom did not <G>.
You are calculating the TNR centerpoint & offsetting it I think <G>.
If not, it's wrong .... LOL ... check it out ...

Tom only explained how to touch off the tool. Properly I might add.

Setting off to the center of the TNR is proper ...

Thus you really are doing centerline programming but don't know
it.

Nope. Centerline programming implies that my coordinates in the
program come from the center of the radius. No need to complicate
things in that way on a simple two axis lathe.

You already complicated them.

How so?

Try centerline programming for a bit & see <g>.
You could even use a CAD.CAM or CAM system that way.


BTW, Managed to try 1/T programming yet? IIRC You needed
another control or option then your usual ....

Ignorance is bliss...

You could also do it explicitly (always works).
Tom is doing neither <G>.

And you gleaned that from just his instructions on how to properly
touch off the tool?

General programming instructions it looked like <g>.

Nope.

A ==> B ==> C
--
Cliff
.

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