Re: I am looking for Lathe Cutting tool parameters for CNC

Eric,

IMO, it makes no sense to use anything but a configuration that will
both face and turn with the same insert. The most common type which
does this is an 80 degree diamond shape. The one I use is a
CCMT32.5x (that may be larger than the smaller lathes can use, it's
a 3/8" IC insert, but they come in smaller sizes). The "x"
represents the cutter's tip radius.

For low powered machines the 80 degree diamond inserts are available
in positive rake and high positive. These cut very freely. I buy
some of these from H B Rouse Company in Chicago, 815-943-4426.

Doug

--- In CAD_CAM_EDM_DRO@yahoogroups.com, glee@i... wrote:
>
> Here is Craig's response from Sherline. Surely someone else has
already
> dealt with this challenge and can tell me what specifics I need to
know and
> perhaps how to determine the specs for myself.
>
> Anyone, Anyone?
> -Eric
>
> =======================
> Dear Eric,
> The brazed tip carbide cutting tools we offer are purchased from
an outside
> source. I do not know what the specifications are for tip angle
and radius
> and angle. The HSS tools we offer are all ground for us by a
company in Los
> Angeles that has the work done in their factory in China. They
were made to
> match an approved sample which was hand ground. Each tool is hand
ground,
> so
> I'm sure they all vary somewhat. I'm afraid I can't be of much
help here
> either. I would suggest you take your question to the Sherline
group at
> www.yahoogroups.com. There are a number of users there with a lot
of
> experience in CNC who could probably be of more help than I can.
Someone
> there might know which values are important and which ones can be
simply
> measure off an existing tool.
> Craig Libuse
> Sherline
>
> -------------------------------------------------------------------
-----------------------------------
>
>
>
>
>

> Georgia
Lee

> Sent by: Eric To:
CAD_CAM_EDM_DRO@yahoogroups.com
> Mack
cc:

> Fax
to:

> Subject: I am looking
for Lathe Cutting tool parameters for CNC
> 05/18/2003 (Document link: Georgia
Lee)
> 05:01
PM

>

>
>
>
> (I have posted this question to CCED, Dolphin, and Sherline. I
will share
> what I learn accordingly.)
>
> I am working on a CNC Turning for use with my Sherline CNC Lathe.
I happen
> to be using Dolphin, but my question applies to any system.
>
> The Dolphin Partmaster (and any other CAD/CAM) system requires the
> definition of the tools that are to be used so that the cutting
paths can
> be generated. I am working with the Dolphin Turning Module. The
code that
> I generate will be used on a Sherline CNC Lathe. (It could be any
CNC
> lathe, but that is what I have).
>
> MY REQUEST FOR HELP:
> I need help defining the turing tool parameters, so that I can
enter them
> into my CAD/CAM program. Vendors sell tools and will usually
mention one
> angle, but they do not provide the details, such as tip radius,
included
> angle, width, or cut depth. (Am I making this harder than it
needs to
> be?)
>
> MY GOAL:
> To define the parameters for each of the tool types shown below.
>
> -Eric
>
> DETAILS:
> Dolphin Partmaster Turning Module recognizes 5 standard cutting
tool types
> as I have shown below. In the setup screen, there are up to 7
parameters
> that are required to define the given tool. I need to work out the
tool
> parameters for the standard Lathe tools that Sherline sells.
>
> I would appreciate any help offered to "Fill-in the blanks." Once
I have a
> complete table, I will share the results with those interested.
>
> Here are the 1/4" shank Lathe cutting tools that Sherline sells:
> 11920 Carbide Tip, Right Hand Cutting Tool
> 11930 Carbide Tip, Left Hand Cutting Tool
> 11940 Carbide Tip, 60 Degree Cutting Tool (I assume this is
for
> threading)
> 11941 Carbide Tip, 60 Degree Cutting Tool with 1/64" nose
radius for
> profiling
> 11950 High Speed Steel, Right Hand Cutting Tool
> 11960 High Speed Steel, Left Hand Cutting Tool
> 11970 High Speed Steel, Boring Tool
> 1200 High Speed Steel, Internal Threading tool, 1/4" Minimum,
Right Hand
> 30860 Cutoff Tool 0.040
>
> There are also several VALENTINE insert tools. If anyone has the
specs on
> these, I will add them to the list.
>
> Here, in row/column format, are the tool types and the various
parameters,
> along with their default values.
>
> My goal is to create a table like this one, but with the
parameters for the
> above tools.
>
> Specifications TURNING GROOVE THREAD BORE
TREPAN*
> Primary Angle 275 Deg 270 Deg 240 Deg 85 Deg
0 Deg
> Included Angle 80 Deg 0 Deg 60 Deg -
80. Deg
> 0 Deg
> Tip Radius 0.0315 IN 0 IN 0.0079 IN 0.0315
IN 0 IN
> Z Offset 0.0315 IN N/A 0 IN 0.0315
IN N/A
> X Offset -0.0315 IN N/A -0.0079 IN
0.0315 IN
> N/A
> Width 0 IN 0.1969 IN 0 IN 0 IN
> 0.1969 IN
> Cut Depth 0.1575 IN 0.5906 IN 0.1181 IN 0.1575 IN
0.5906 IN
>
> * TREPAN - This is a term which refers to a Face groove on a
Turned Part as
> opposed to a normal groove which is achieved by plunging the
Groove tool
> into the diameter of the part. A TREPAN is achieved by plunging
the tool
> into a Face on a turned part. I think most people these days
refer to a
> Trepan as a Groove or Face Groove.