Counter sink hole

[TigerPilot]

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

[psychomill]

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.

[TigerPilot]

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

[psychomill]

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.

[TigerPilot]

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.

[psychomill]

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.

[TigerPilot]

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

[ger21]

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.)

[Ken_Shea]

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.

[ger21]

He wants to use only one tool, I think.

[buscht]

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.

[psychomill]

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.