Re: [CAD_CAM_EDM_DRO] Thread milling

Are you doing the thread milling with the shaft mounte in a vertical
position?

If so you can do your thread milling using the G02 or G03 command in
conjunction with a linear Z move.

Smoke

>
>
>Drew Rogge wrote:
>
>> There was a discussion a while ago about thread milling but after
>> talking my cousin into trying it on his CNC machine I realized
>> that I don't know if there's a straight forward way of doing it.
>> I first thought that all there was to it was to do a couple of
>> circular interpolations in XY while ramping down in the Z. Now
>> I'm wondering how one programs the arcs with G02/3 while ramping
>> the Z with a G01. Is there an easy way to do this or do you have
>> to approximate the arcs with a bunch of short lines?
>
>With modal command G17 (arcs interpolated in the XY plane)
>then any arc commands only cause circular motion in the X and Y
>axes, and the Z axis is still linear. You do not specify a G01 for Z.
>With G17 in force, and movement specified by a G02 X... Y... Z...
>(and some I, J or R word to program the radius), you will get
>a helical motion around the Z axis. This will get your thread milled
>with an appropriate cutter.
>
>You do NOT make short linear segments, just one command for every
>1/2 or 1/4 revolution, depending on some details of your CNC control.
>
>Jon
>
>
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