Subscribe to Blog
Email Address
 

Things not directly related to machining

Pages:(13) 1 2 3 4 5 6 7 8 9 10 11 12 [13]

New Support Forums

December 11, 2012, 9:02 am by Eldar Gerfanov

After quite a few requests i have finally created support forums to address suggestions/bugs and problems regarding FSWizard

Please submit all your requests in the appropriate sub forum over here http://zero-divide.net/index.php?page=forums

 


New web site layout

December 9, 2012, 4:11 pm by Eldar Gerfanov

So how do you guys like it.

Give me a shout!


Advantages of using Hi-Helix endmills

November 24, 2012, 12:25 am by Eldar Gerfanov

Hi-helix end mills have several advantages inherited with their design.

Simple math says that a an endmill with 45 degree helix angle directs 50% of the cutting force downward versus  25% for a 30 degree end mill.

Main advantages are:

  • Higher rake angle directs more of a cutting force downward.
    This reduces side load on the cutter, that leads to less deflection and less tendency to chatter.
  • At high axial engagement (deeper depths of cuts) more flutes remain in the contact with the work piece. This leads to much smoother cut, again reducing tendency of the cutter to chatter.
  • High helix angle pulls chips upward and away from the cutting zone.
    This reduces chip re-cutting and helps prevent cutter from getting clogged up. This also allows to take deeper cuts and increases productivity.
  • Because of higher helix more of flute length is being used in the cut. Better surface finish is achieved even when using the same chip load.
    Generally an end mill with 45 degree helix can be fed 30% faster than equivalent one with 30 degree helix and still achieve same surface finish.

 

High helix end mills also have disadvantages that a machinist has to take into consideration:

  • With more of cutting force directed axially, the load on spindle bearings in downward direction is increased.
  • Tendency for both the end mill and the work piece to pull out is increased. So a more rigid tool holding and work clamping should be considered.
  • Higher helix end mills are also less stiff that regular helix end mills. This may cause more deflection and may become a problem when having to machine straight walls.
    This effect should be mostly diminished by lower side radial load, but it still needs to be considered in some cases.

Famous Quotes/ Deep thoughts

November 23, 2012, 11:21 pm by Eldar Gerfanov

Just decided to store here the quotes that i liked.

And those that made me think about purpouse of life and Univerce.


Pages:(13) 1 2 3 4 5 6 7 8 9 10 11 12 [13]

© 200908:53:46-2016 Eldar Gerfanov. All Rights Reserved.
© 2009 Eldar Gerfanov. Materials on this site are presented as is and are mostly for educational use. You may freely reproduce information presented herein without any consent from me, provided you include link to this site.
In case when i am not the copyright holder, you may want to contact proper owner of material. Anyway, they are freely available on the Internet.
If you hold the copyright right for any of the materials on this site and want them removed, please contact me here