Re: [CAD_CAM_EDM_DRO] How does a polygon turnign lathe work?

The flats may be concave after all but not noticeable at this diameter. Look at the second video from citizen showing slow motion. The cutter makes a much larger diameter pass on a relatively small diameter piece. The larger the diameter cutter and smaller diameter work piece, the less concave will be the flats of the hex. What is surprising is that the cutter diameter is under CNC control as well as in the video you cite - the cutter makes a second larger hex closer to the chuck without missing a beat. It seems the number of "axes" in a machine can be extended well beyond what we're used to. All possible due to CNC.
 
Stop the video several times and you'll likely see a perfectly consistent reflection on the flats as if they were truly flat. Stop it at 1.02 and you see the top and bottom parts of the flat shiny but the middle of the flat is darker suggesting concavity.
 
Of course, this completely a guess :-)
 

 
From: danmauch <dmauch@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Friday, October 7, 2011 11:44 AM
Subject: [CAD_CAM_EDM_DRO] How does a polygon turnign lathe work?


 
I saw thisamzing video http://www.youtube.com/watch?v=KMdBIBzGtKI and can't quite figure out how the machine is cutting the hex so perfectly. I do see that the cutter is just a staight bit and see that the millhead is syncronized via drive shaft to the spindle. But with the cutter on the perimeter of the milling head I would think the hex flats would be concaved. So how does the machine actually work?
Dan




[Non-text portions of this message have been removed]