Amazing!Yes I do, that titanium sheet has 770lbs of force holding it to the chuck thanks to vacuum....
That is awesome. Thank you for posting. Could you possibly take a close-up of how you have the cutter ground??Boy, have I got balls! Needed to make ball shaped ends on bat handles. Many would go to the lathe and plunge it with a form tool or use a ball turner. Through the years I have migrated over to the mill using a fly cutter and whatever device to rotate the part. For me this method is MUCH faster, more accurate and safer. One of the pics is showing the boring head with cutter. The cutter is rather long in this set-up, should be shorter for best rigidity. The cutter was from my last job that needed more length. I tried it on this job and was OK so went with it. Next will be polish the ends that I just made, the straight knurl, cut it off and make the center hub. All the ball ends in the pic maybe took ½ hour to make…Dave.View attachment 135490 View attachment 135491
Yes I do, that titanium sheet has 770lbs of force holding it to the chuck thanks to vacuum....
OK, been a while since I was in school . . . the hold down force would be 14.7 psi times the surface area of the vacuum surface. If you had a pure vacuum pulled over a 10" x 10" surface area you'd have a hold down force of 1470 lbs. Like Uncle Harry said above.Been a long time since posted anything, but that doesn't mean I haven been busy, here's a vacuum chuck I made, it's modeled slightly after the Mitee bite vm100, 6x12.75 I machined it from 1" Alcoa MIC6 cast plate. It has slots on the sides for the clamps I made for it (not shown). I fly cut both sides and got a thickness variation of about 5 tenths across the entire chuck. The finish pass on the work side took an hour and 45mins to do, .005 doc, 1/4" minute. I'm using an electric vacuum pump, holding an 1/8th thick sheet of titanium down I pulled pretty good and couldn't break the seal.
I still need to sand blast the surface for some traction. I also intend to drill and ream locating holes for pins around the perimeter, I may also drill and tap all the squares. Additionally I would like to add larger locating pins to use it as a sub plate/pallet changer. I'm about $60 into the chuck not including the pump. Also had to make a small modification to the brass flare nut as seen being held in the Bison
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