At 04:45 PM 4/2/2010, you wrote:
>In the end I went for a fast rotary axis based on a 3/4"
>straight-shank ER32 collet chuck from eBay (about £15) with a 6:1 belt
>drive to a NEMA 23 stepper. This is held between taper-roller bearings
>in a housing that bolts to the table.
>The hob is mounted in the milling spindle, and the spindle is set over
>at the correct angle to suit the lead angle of the hob.
>In the HAL file there is a direct link from the spindle position to
>the rotary axis position, with a scaling factor to suit the number of
>teeth to be cut. This keeps the two axes in permanent synchronisation.
>The number of teeth comes from a spinbox in a PyVCP panel.
>(I need to find a way to zero the encoder and steppgen when the number
>of teeth is changed, otherwise it tries to re-synch when I change the
>tooth count).
>
>Anyway, on the basis that a picture is worth a thousand words, here
>are approximatelt 2000 pictures.
>http://www.youtube.com/watch?v=ZhICrb0Tbn4
>
>--
>atp
Andy,
That's pretty slick! It worked out
great. Ain't it great when it all comes together?
Mark
PS: Anybody ever tell ya you have an accent? =8^Þ
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