Re: Mori Seki SL1 NC lathe programming

Cliff,

Cliff wrote:
snip
For setup just set it to the eneter of the TNR. Not hard.
For programming centerline works just fine.

Keith's vintage SL-1 lathe does not have TNR compensation. So the G50
values have to be calculated and input manually and your method is more
difficult and has more calculations and inputs at the machine than
necessary which creates more opportunities to make errors. The
resulting code from your method is also more difficult to read at the
machine and prone to more reading mistakes by the setup person and the
operator.

You can even cut
with both sides of the tool's radius

Using my method Keith can cut on both sides of the radius. You keep
acting like the center of the tool nose radius nor the radius edges are
an unknown, we know exactly where they are located.

and arc start & end point
locations are easier to calculate.

You sure haven't proven that by your examples, quite the opposite your
method seems burdensome and prone to errors.

Try some fillets between some tapers ....


All along we have been discussing using CAM so ease of calculations is
a non-issue the profiles are simple CAM elements as are the tool paths.

2) It is not necessary and in Keith's case counter productive to add
two levels of difficulty your recommended in programming and setup when
the machine control can't utilize the resulting product (code).

It cannot use centerline programming? LOL ... How would it know
which was which?

The only logical reason for Kieth to add levels of difficulty and
center-line program would be if his machine had TNR compensation and it
does not so it's a non-issue. You method is just adding unnecessary
levels of difficulty that leads to more mistakes not making more good
parts.

4) Now you seemingly advocate adding another unnecessary step of
drawing a simple 2D shape in 3D CAD?

This is an ASCII-only NG .... simple ways to convey what might
otherwise be pictures & hand-waving ...


You misread my example, I was stating that Keith was wasting his time
if he drew simple geometry in a CAD program then imported it into a CAM
program to add tool path. No reason to waste time drawing pretty
pictures of 3D models on a simple 2D part. Go straight to CAM and
program the tool path.

On such a simple program as your
example that has a couple of lines and an edge break it seems counter
productive to draw it in CAD then export to CAM to assign tools and
tool path. Wasted time drawing a solid on a simple 2D profile when it
could and should be one step draw the tool path in CAM.

Where's jb when you need him? Anyone know?

Well now you are agreeing with JB?


No 8 axis lathe here for Keith. his SL-1 is simple 2D grunt work so
keep it simple. I am confident Keith would rather make good parts fast
rather than time consuming pretty pictures of parts slow which produces
confusing code and more opportunities for mistakes on setups.

Why not ask him how much he already knows? Orhow much he never
wants to know anything about?

I did ask Keith, you didn't, you have gone off on a total rampage
without any of the necessary background on Kieth and his shop nor even
his work to base your biased opinions on.

As stated previously in a post I made a few days ago I did get input
from Keith. He told me about his shop, machinery, work, future plans,
his CAD/CAM program, etc. You are the one that went off on a mission
spouting practices and procedures without having any of the necessary
background on Keith.

You are set on his "Best Shop Practices" without having detailed
information on Keith to base your opinions on, you are making
recomendation on pure ignorance for your part.

Tom

.

Relevant Pages

  • Re: OT: PDM for CNC code
    ... CAM holds the model and tool path, ... CAM data does not change, post from CAM data ... Machining strategy could change depending upon the CNC machines on the ... specific tooling changes. ...
    (comp.cad.solidworks)
  • Re: Mori Seki SL1 NC lathe programming
    ... On the negative side you are proposing that Keith create a system and ... As compared to perhaps twice in each line of code .... ... module to calculate the tool path. ...
    (alt.machines.cnc)