584,862 active members*
4,814 visitors online*
Register for free
Login
Results 1 to 19 of 19
  1. #1
    Join Date
    Mar 2005
    Posts
    116

    Counter sink hole

    I did a drawing in 2d. It has a hole of about 1" diameter. I want to counter sink the hole about a 1/4". I have the tool to do everything except the counter sink, which will be 3d. Can I do it without a 3d program?

    Yoram

  2. #2
    Join Date
    Mar 2005
    Posts
    988
    Yes. In 2d just interpolate the 1.0" hole with a counter sink or chamfer tool to the size you want. Just calculate for the angle and depth.

  3. #3
    Join Date
    Mar 2005
    Posts
    116
    I'm using DeltaCad. I may have reached its limits. I cannot chamfer in the top view which is, ultimatly, the tool path view, because it will not chamfer circles. I can chamfer in the side view but that will not help me much if I don't get it into the top view.

    Yoram

  4. #4
    Join Date
    Mar 2005
    Posts
    988
    Can you cut a circle at all? By a contour method? At least that way you'll get some code you can use. Or just hand write it. :cheers:

  5. #5
    Join Date
    Mar 2005
    Posts
    116
    Yes, it will cut a circle but don't ask me to modify it since that is what I'm asking you how to do. To me it is still all Chinese.

  6. #6
    Join Date
    Mar 2005
    Posts
    988
    Since I'm not familiar with DeltaCam (which I thought was only a cad platform... didn't know you can program with it) I'll just try run this over with you assuming some capabilities of the system.

    You shouldn't actually have to draw a chamfer to cut it. You already have a 1." hole so use that. Let's say you have a 3/4 x 45deg countersink or chamfer tool. So for purposes of getting code, call that tool a .100 endmill. Now do a contour cut inside the hole. Now you just control your 'Z' depth to get the size you want. Assuming its a 1/4" x 45deg chamfer, you would move in 'Z' (-.250) plus 1/2 the diameter of the tool for a total of (-.300) in 'Z' if you're programming with comp. If you're centerline programming, then you need to add .05 to cutter comp at the machine and still move -.300 in the program.

    If the angle of your chamfer is different, say 60deg (30deg) or 82 deg (41deg) then just calculate for 'Z' given those angles.

    Hope this is what you're looking for. :cheers:

  7. #7
    Join Date
    Mar 2005
    Posts
    116
    Not quite wat I was looking for. :-) First let me say that I did say DeltaCad and not DeltaCam. ;-).

    The counter sink was just one exemple of what I want to do it I thing it is the simplest. If I'll solve it I'll know how to do the other one.

    In your solution you use a angled tool. What if the tool was flat or ball? How can I do it then?

    Yoram

  8. #8
    Join Date
    Mar 2003
    Posts
    35538
    You make multiple passes, calculating the depth and position of the tool at each pass. Not the easiest way, but the cheapest. (no CAM needed.)
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  9. #9
    Join Date
    Apr 2003
    Posts
    1873
    TigerPilot I think we are a little confused on what it is you want to accomplish, at least I am ???

    What I think you are needing is to draw the part for creating the g-code later on. If this is the case I do not see a need to draw this counter sink in 2D.

    In machining this portion you typically would have three operations.
    1) spot drill
    2) drill
    3) countersink
    All using the same center point in the drawing only the tool and depth of cut would change.

  10. #10
    Join Date
    Mar 2003
    Posts
    35538
    He wants to use only one tool, I think.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  11. #11
    Join Date
    Nov 2003
    Posts
    634
    Tigerpilot,

    Let's say that you want a 90 countersink. You should draw a bunch of circles, each one .016" larger in radius than the previous one. They should go from 1" dia to 1.50" dia.

    In your CAM program, you would have to link each circle to a depth. Each circle would be .016" deeper than the next outer circle. Pocket out each circle.

    This will give you a crude 1/4" chamfer around your 1" hole, with .016" steps. If you want it finer, trying using .008" as a step.

  12. #12
    Join Date
    Mar 2005
    Posts
    988
    What if the tool was flat or ball? How can I do it then?
    Well, like this....

    You make multiple passes, calculating the depth and position of the tool at each pass. Not the easiest way, but the cheapest. (no CAM needed.)
    Or you'll have to do it in a 3D toolpath.

  13. #13
    Join Date
    Mar 2005
    Posts
    116
    Quote Originally Posted by ger21
    He wants to use only one tool, I think.
    Yes, I do (are we now married?)

    The idea to make gradually increasing circles, in depth and in width, will work for this part.

    Let me ask it a little different. I want to make a path of, let say 6”. I want it to make a cut 1” on x and 1” on z at the same time so that the cut will be at 45°. I then will travel 4” on x, which is not a problem and then come up again at 45°.

    In the long run I might have to start using 3d cad. I didn't want to do it since it is much more difficult but may be the only solution. As I’ve said, I love DeltaCad which I found very intuitive to learn and use. I wish some one will make a 3d program as easy as that. In drafting you draw in three views and extrapolate from this the isometric. Why can a computer program not do it too?

    Thank you all for the input anyway. It did help my thought process.

    Yoram

  14. #14
    Join Date
    Apr 2003
    Posts
    1873
    How about using a helix.

    You many need to put a full circle at top and bottom to cleanup the entry and exit cuts.
    Attached Thumbnails Attached Thumbnails helix.jpg  

  15. #15
    Join Date
    Mar 2005
    Posts
    116
    Quote Originally Posted by Ken_Shea
    How about using a helix.

    You many need to put a full circle at top and bottom to cleanup the entry and exit cuts.
    That is what i meant with counter sink but I think you made it in 3d and I was curious if I can make it in 2d and add a little code to make it. I say little since I don't want to tax my abilities as of yet.

    If someone has a sample program I can take a look at and maybe work from there.

    Yoram

  16. #16
    Join Date
    Apr 2003
    Posts
    1873
    The G-code for the helix is attached.
    Attached Files Attached Files

  17. #17
    Join Date
    Mar 2005
    Posts
    116
    Quote Originally Posted by Ken_Shea
    The G-code for the helix is attached.
    Ken, you da man my friend. Would you have a gcode for the path I've mentioned 2 post above?

    Thanks, man.

    Yoram.

  18. #18
    Join Date
    Apr 2003
    Posts
    1873
    Yoram,
    Do you have a drawing of what you want the code for ?

  19. #19
    Join Date
    Mar 2005
    Posts
    116
    Quote Originally Posted by Ken_Shea
    Yoram,
    Do you have a drawing of what you want the code for ?
    Yes, I do (sheesh, the second time today).

    First a little history. I want to build a homebuilt canard airplane , an Eracer, which is made out of foam and Epoxy / Fiberglass composite. It is a plan built plane. The wings are cut with hotwire and there are six sections. I don’t want to cut it by hand since I have to sit in it eventually. So I looked around and saw that people are cutting foam wings with a computer driven machine and I decided to build one. So if I make a machine why not cut all the foam parts with a router and shape them too? One part, which I’m still far away from, is the retractable nose gear and its two mounting plates. These plates have four holes in them for the gear pivot and three other shafts. These shafts are screwed to the foam with a washer and a nut. Since it is foam you have to reinforce the foam. You do it by counter sinking the holes half way of the foam (0.125”) and fill it up with glass and epoxy.

    The other tool path I’ve mentioned is for the fuselage which is made out of 2” and 3” foam blocks. I have to rout the contour, not a problem, and then the various recesses for my but to sit in and so on.

    The counter sink I could do as suggested with an angled tool but would prefer not to change tools. The other recesses are one inch or more deep and ideally would be done with a flat tool.

    I’m off my box now. What a speech for such a simple question.

    Yoram

Similar Threads

  1. distorted hole
    By emergent in forum Visual Mill
    Replies: 2
    Last Post: 05-09-2005, 03:54 PM
  2. Gecko 320 Heat Sink ?s
    By Bird_E in forum Gecko Drives
    Replies: 2
    Last Post: 03-13-2005, 08:09 AM
  3. Drilling a perpendicular hole in drill rod material
    By ngr1 in forum MetalWork Discussion
    Replies: 12
    Last Post: 12-04-2004, 04:16 PM
  4. G-code to zero counter?
    By erase42 in forum G-Code Programing
    Replies: 3
    Last Post: 07-19-2004, 04:01 AM
  5. Heat sink mounting questions
    By CactusChip in forum Gecko Drives
    Replies: 3
    Last Post: 01-31-2004, 07:43 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •