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3200RE: [mlathemods] Re: Flat or raked part off tools?

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  • Mert Baker
    Jul 6, 2010
      Don't have a photo, but if you can imagine first, a standard parting blade, and then imagine grinding away the sides except near the top cutting edge, resulting in a T shaped cross section, you'll get the idea.  The traditional parting blade, in use, gets dull, not only on the cutting tip, but also on the top edges of the sides, resulting in a sort of tapered shape that rubs on the sides of the cut, & heats things up.

      -----Original Message-----
      From: mlathemods@yahoogroups.com [mailto:mlathemods@yahoogroups.com]On Behalf Of David Lee
      Sent: Tuesday, July 06, 2010 10:02 AM
      To: mlathemods@yahoogroups.com
      Subject: RE: [mlathemods] Re: Flat or raked part off tools?


      Maybe someone would be so kind as to provide this uninformed novice [me] with a link to a photo of a “T” type parting tool.



      From: mlathemods@yahoogro ups.com [mailto:mlathemods@ yahoogroups. com] On Behalf Of Mert Baker
      Sent: Tuesday, July 06, 2010 9:46 AM
      To: mlathemods@yahoogro ups.com
      Subject: RE: [mlathemods] Re: Flat or raked part off tools?

       I bought all my parting toolbits years ago, and they are all the wedge type.  However, one of 'em is now only an inch long, and I'll get one of the T type to replace it.   Never had any trouble with the wedge type, once I learned how to sharpen & set 'em properly. 

      [David Lee Responds ->] I’ve not ever had any luck at all with any parting tool but, if I keep at it, I may eventually finger out what I’m doing wrong.

       Until then, the less said, the better.


      -----Original Message-----
      From: mlathemods@yahoogro ups.com [mailto:mlathemods@ yahoogroups. com]On Behalf Of James W. Early
      Sent: Tuesday, July 06, 2010 9:30 AM
      To: mlathemods@yahoogro ups.com
      Subject: Re: [mlathemods] Re: Flat or raked part off tools?


      Which is why the "T" style blades require only about 20% of the force that conventional wedge style bladeds do. This is also why they do not require a heavy rake like the wedge blades do and why they stay sharp up to 20 times longer. On my CNC at work wedge blades neded to besharpened every 3 hours in production while "T" blades were good for up to 36 hours on the same job. After using the "T" blades for over 20 years in production work I find it amazing people still waste their money and time on the silly wedge blades!

      Long Beach, CA

      --- On Mon, 7/5/10, David Beierl <dbeierl@attglobal. net> wrote:

      > From: David Beierl <dbeierl@attglobal. net>
      > Subject: Re: [mlathemods] Re: Flat or raked part off tools?
      > To: mlathemods@yahoogro ups.com
      > Date: Monday, July 5, 2010, 7:09 PM
      > At 10:07 PM 7/5/2010 Monday, jim.klessig@ eticonformity. com
      > wrote:
      > >Ok being one of them novices, what is the difference?
      > The old-style blades have an elongated V section and an
      > angled bottom
      > to clamp into a half-vee groove at the bottom of the tool
      > holder.  The T-style ones have a T section with a flat
      > bottom.  Because the width of the blade sharply
      > diminishes
      > immediately below the cutting edge these blades offer much
      > better
      > chip clearance.
      > Yours,
      > David

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