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Would anyone have an example they would like to share, We have a cylinder with bosses, I'm spending way too much time trying to remember how I did this before.
can't share the file, but think of a birdfeeder shape.
there was nothing I could find on the tech exchange.
Every new machine we purchase gets it's own steel grid plate made to suit. max overlap of table is a plus. 5/8-11 and Ø.6255 x 2" grid, All our Fixtures fit every machine. The only ones we wont do is our Kuraki's although we did do the 6 axis KTR 1200.
Did some work for "a biG powEr plant". they outsourced the castings from India. There were noticeable ball bearings and other unconfirmed hard spots inside. Nightmare to machine. NDT failed all 6 parts. These were Ø4' X 5' long, bosses on ends were Ø2' X 8.0". We kept the snake we found in one of the crates in the programming office ( in a terrarium) for like 3 months before the office girls found out.
We did this once. on our VG5000's a few years back, Machine inspection send back was good but comparing to CMM was off a bit. Machine error will reflect on inspection in the machine. We were able to duplicate it. a few tenths off. We can't trust that.
All inspections are now still done in inspection. You can make a lot of scrap checking a part with a machine that is out. We ball bar ours twice a year, but yeah if your gauges are off, and inspection uses them to check a part, it's still going to be off.
IMHO don't do that.
I always finish the minor diameter with an endmill prior to plunging the tool onto the part, some people think undersize is better for drag on the tool, less chatter. But I go slow with molly-D and It's been quite successful in everything from A36 to 316L only cutting the critical area and thread milling after, taps are a nightmare. And don't forget most port tool spot faces are only required on unmachined surfaces. If you mill the face prior only a SF dusting is needed.
I've cheated this before by making an opposite rad surface toolpath on the inside with the bottom of the tool, and let the back of the tool cut the part.
I'd load a picture but my "max total size" is set for 1.45 kB.
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