Chamfering

[Thoob]

Hi. I have a piece 1.0" in diameter and I am putting a hole through it. I want to chamfer it but I don't want it big on one side and small on the other, if you know what I mean. How can I program a 2d chamfer around maintaining a specific chamfer size?

[Dave.L]

Use 3D chamfer and select the hole as a contour (assuming you have 3d geomtry

[Thoob]

Ok. Now what if I don't have the 3d? I mean I can always draw it in but is it possible to do it otherwise? I have X4 Mill Level 3 but I want to avoid drawing it everytime I have a hole on a diameter.

[Dave.L]

Ive have no idea how you would ever do this without 3D. The system cannot calculate a change in z if it is flat geo

[Matthew Hajicek - Singularity]

In theory you could write a macro program that would calculate it without a model, but it should take less than thirty seconds to draw a cylinder with a hole in it.

[Thoob]

Ok. Good enough then. Thanks fellas. I'll draw it up.

[crazy^millman]

With solids or without solids you could draw a circle in one view. Extrude a solid or draft for a surface. Then from another view you just project the hole onto the solid or the surface and done. Easily created 3d geometry with ve3ry little work.

 

HTH

[Odell]

Just buy an E-Z Burr tool. Use it as a reamer. You can adjust your chamfer size and maintain it on both side. Their inserted too.....

[Dave.L]

quote:

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Just buy an E-Z Burr tool.

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Good tool for some applications, not all.

 

What if you have a slot on the OD of a part? You will need a 3D chamfer to do it.

[PeterM]

Here are 2 ways to do it. If you do not have solids create surfaces and generate a spline at the intersection, use that to drive a chamfermill toolpath. Secondly I have one old clunker that does not have 3 axis simultaneous, so I create an ellipse, then use a chamfering tool large enough to get to the part from one Z depth. I am perhaps not explaining the ellipse very clearly, but it works like a charm.

[Jeremy Grigsby]

For futher explination of the ellipse, PeterM means having the small sides of the ellipse going around the cylinder, and having the other sides touch your original circle at the center of the points where it drops around the cylinder. It will essentialy produce the same thing as a 3d chamfer. You may have to play around with finding the right ellipse ratio between different parts and figure out depths.

[PeterM]

For this example stock diameter is constructed from the right view and the bore is constructed from the top view. from the right view construct a line at the angle of your chamfer from the intersection of the hole and the stock diameter. Trim it to the top of the stock. change to top view, construct the ellipse using the center of the bore, X edge of the bore, and the endpoint of the line which is oriented with the y axis.