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Newbie

## Chamfer back of hole

hello guys

ive got to machine a chamfer on the back of a 25mm hole using a 16mm dia dovetail cutter,ive tried using trajectory milling but the cutter just comes down through the component,how do i get the cutter to come down in the centre of the hole then machine round the back of the hole.

thanks for any help

1 ACCEPTED SOLUTION

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## Re: Chamfer back of hole

Michael,

this what I do to get any tool to start in the center of any diameter hole. take the hole diameter minus the tool diameter times .208 to get the leadin leadout amount. then set the entry angle and exit angle to 135.

In my example picture the hole diameter is .375 and the cutter diameter is .250 so the math is .375-.250=.125*.208=.026 this value goes in the lead_radius and tangent_lead_step as shown in the picture.

As you can see in the picture it makes an nice entry and exit back to the center of the hole.

6 REPLIES 6
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## Re: Chamfer back of hole

Michael,

this what I do to get any tool to start in the center of any diameter hole. take the hole diameter minus the tool diameter times .208 to get the leadin leadout amount. then set the entry angle and exit angle to 135.

In my example picture the hole diameter is .375 and the cutter diameter is .250 so the math is .375-.250=.125*.208=.026 this value goes in the lead_radius and tangent_lead_step as shown in the picture.

As you can see in the picture it makes an nice entry and exit back to the center of the hole.

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## Re: Chamfer back of hole

Thanks Steve

is there a formula i can put in the required parameters so i dont have to work it out each time?You do seem to help me out a lot cheers.

michael

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## Re: Chamfer back of hole

Michael,

I have never tried to automate how the formula is calculated from within Pro? Not sure how to do it? maybe some one else has an Idea.

I do it so much it's just automatic for me.

Steve

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## Re: Chamfer back of hole

If you want to build in automation check this site out http://www.codexcreo.com/AE_UDF.html

The idea here is to build the manufacturing information into the feature (hole) and then apply those settings automatically in the manufacturing file. I have never gotten it to work but maybe you can figure it out.

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## Re: Chamfer back of hole

I have looked at annotation features a little bit but not sure if it would work for this situation because you are kind of locked into the tool diameter with my method of leadin leadout. I also can't rely on engineering using the annotation in their design. I would have to add the annotation features myself to use them.

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## Re: Chamfer back of hole

Right but i was thinking you could incorperate some parameters. You could in theory build the expression right in your manufaturing seqence parameters something like (hole_diam1 - cutter_diam)*.208 =

Just a thought.

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