Bottom chamfer

[belearner]

Hello all.

I have a part .375 thickness with a hole 1.000 dia and .020 chamfer 45 deg on both side. I can do a chamfer on top of hole , but have trouble to figure out how to make a contour at bottom .

Just use 2D. Thanks for your help.

[Dave.L]

To my knowledge, you will need to figure out the depth by hand since I don't think MC has this ability.

[GI George]

We have chamfer bits that are inserted with a 45 deg. on top and bottom. So once we get the top tweaked in we can drop in and do the bottom of the hole. You have to watch how deep you go into the hole. We always use contour paths here, not sure how other people do it.

[mayday]

dovetail anyone?

are we on a basic machining forum or a mastercam forum

[Superman]

quote:

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are we on a basic machining forum or a mastercam forum

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Did you not start somewhere ?

and he is asking a Mastercam questiom

[Dave.L]

quote:

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are we on a basic machining forum or a mastercam forum

 

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Did you not start somewhere ?

and he is asking a Mastercam questiom

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So Mayday, please school us since you know a bottoming chamfer cycle in MC that no one else know.

[belearner]

1000+ Dave

[Steve Hattori]

On 3d contours, I have actually programmed using a standard chamfer tool, Contour 3d-chamfer, from the BOTTOM tool plane. Then, do a backplot, save the toolpath as geometry. Then switch back to TOP toolplane, and use a double-chamfer tool in a standard contour toolpath with the saved path for geometry. (Turn off the tool offset) You then just need to do the math on the shapre of your double chamfer tool, and set the contour depth at whatever it needs to be for the tool to touch. I use a "custom" tool that is draw exactly to match the real one, and you can see in backplot if you get the depth right

[[email protected]]

belearner,

I have woodruff key style cutters with a double 45 and like Dave says, you will have to calculate the depth but it works great after you get it dialed in. I use "Circle Mill" and start at center with 135 degree lead in/out.

 

connormac (forum member) posted a formula that I have printed out at work (I'm @ home now) that shows how to make it start in the dead center of the hole. If you cant find it on here I will post it 2morrow

 

HTH

[belearner]

Thanks for your help, and i found this:

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"Someone on the board figures this out so I am just passing it along. It is perfect for holes.

 

(Dimeter of hole - diameter of tool) / 2 x .4142 = Y

 

Put Y in in length and radius and 135 degrees in sweep.

 

This has the tool come down in the center of circle every time."