Width and angle of router bit?

Discussion in 'Off-Topic' started by spinnaker, Jan 5, 2017.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716
    Ordered these a while back. Of course I never marked their specs. Can anyone hazard a guess at their width and angle?


    upload_2017-1-5_22-20-8.png
     
  2. tcmtech

    Distinguished Member

    Nov 4, 2013
    2,808
    2,705
    Eighth inch shank and 20* - 30* point angle.
     
  3. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716
    But what is the width of the cutting surface (tip diameter)? I need that to calculate cutting width for isolation routing.


    upload_2017-1-5_22-52-9.png
     
  4. wayneh

    Expert

    Sep 9, 2010
    16,102
    6,219
    Don't you keep your order records? For me, it's my e-mail database. If I can remember what it's called, I can find the details of anything I've ordered in over a decade. (Yeah, the database is kinda big.) Short of that, I'd say get your micrometer out.
     
  5. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716

    Ordered from ebay but it is a generic description now after all of this time. No details on exactly what was ordered.

    I am measuring .32 mm with my cheapie micrometer and that is about what I have entered as a tool diameter for the last time I used pcb gcode a year ago.


    Does that sound right?
     
  6. wayneh

    Expert

    Sep 9, 2010
    16,102
    6,219
    I may misunderstand but isn't the thickness of the router blade (the z-axis perpendicular to the screen when viewing your drawing above) far more than that?
     
  7. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716
    I need the tip diameter of my bit. Tip diameter is shown in drawing.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,842
    5,884
  9. wayneh

    Expert

    Sep 9, 2010
    16,102
    6,219
    But the hole cut by that tip will be at least as wide as the thickness of the blade, won't it? I think that's probably more than 0.32mm.
     
  10. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716
    No you don't mill that deep. There is a calculator out there (don't have it handy right now) that tells you the actual width based off the width of the tip and angle of the bland and depth being cut.
     
  11. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716
  12. RichardO

    Late Member

    May 4, 2013
    2,273
    895
    I think I would just try it at different depths and see what results I like. ;)
     
    shortbus and cmartinez like this.
  13. shortbus

    Expert

    Sep 30, 2009
    6,871
    4,042
    And since you mentioned having a micrometer, that is more accurate anyway.
     
  14. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716

    a digital vernier, but I did not know they were called that. ;)
     
    shortbus likes this.
  15. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716

    It is not the depth of the cut. It is the width I need to know. The isolation software needs to know how many passes it will need to make. Of course I can still experiment.
     
  16. shortbus

    Expert

    Sep 30, 2009
    6,871
    4,042
    Just know a vernier , digital, dial or a true vernier is still easier to not get the correct feel with it when measuring. And just being "digital" doesn't make them any more accurate, just easier to read.

    Even knowing the 'width' of the tip on those type cutters doesn't mean that's how wide they will cut. A test cut at depth of cut is a better and probably the only way to really know. Those "D" engraving cutters are not held to the same standards as an end mill. A little off center with the grind will make the path of cutting edge rotation eccentric giving a larger than expected cut.
     
  17. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716
    Yes I am aware.

    I am sure you know that the width of the cut can also be estimated by using its tip width and its angle.

    http://woodworkerb.com/home/pcb-isolation-routing/tool-width-calculator/

    I am considering moving to end mills. Supposedly, you can go to 10-mil trace-and-space clearance with end mills and they make for a neater job.
    .
     
  18. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,842
    5,884
    You need a spindle with acceptable run out when using these, I picked up a Japanese made engraver head off ebay cheap.
    Max.
     
  19. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    7,815
    3,716

    Can you point be to what you bought?
     
  20. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,842
    5,884
    It was a one-off a while ago, I still have a photo of it somewhere, if I find it I will post.
    It was not the self powered type, so I coupled a small H.S. DC motor to it.
    Max.
     
Loading...