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Jobnt

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Everything posted by Jobnt

  1. It's vodka. The Machinists' Handbook. Under Threading / Hole Sizes I believe (it's been a while). It discusses the thread strength of harder materials and how smaller thread engagement reduces torque requirements and broken taps while providing the same thread strength as softer metals with higher engagements. I don't have a copy of the Bible any more but I'm sure someone else here has seen this.
  2. In regard to the above references to tapping, I agree form taps are a PITA and threadmilling is the safest (albeit slowest) option. BUT... The standard tap-drill charts don't apply to hard metals like titanium. In the Bible it says when tapping hard metals you can deviate from the standard 70%-75% engagement and go as low as 55%. This makes tapping Ti almost like tapping alum with a cut tap and the correct fluid (Big 'ol PLUS ONE to using Molly D). So unless the drawing specs what max size hole to drill (I really HATE those kinds of engine ears) you should use the Bible and save yourself some headache. ^^^ True story!!
  3. Creating a contour toolpath, geometry has 2 different thicknesses for the geometry. When I set these settings I still get branches at all the intersections with the thinner lines. Is there a (working) method to filter chains by line thickness?
  4. That doesn't create arcs from lines it smooths the transition between the lines by sacrificing accuracy.
  5. I'm not sure we have that kind of control with solids but it may be something in the CD? You could try putting an arc on one of the edges and machine that and see if it puts out arcs.
  6. Are you machining a spline or an arc?
  7. Go to File / Zip2Go. This will put the necessary files with it because just the MCam file isn't enough.
  8. xxxx that! Put those holes in a bag and ship 'em separately.
  9. ^^^ Tried and true method with decades of success for any material type! Axial engagement will vary depending on radial engagement. Try different combinations to find what works best. You can run full depth with > 75% radial engagement but your feed will be very slow. Or you can run full depth with < 10% radial engagement and extreme feed rates. Or you can run at < 5% axial depth with full radial engagement and feed stupid-fast but I've never gotten the MRR to be more efficient using the last method. Machines usually can't accel fast enough to hit those kinds of feed rates before it has to slow down for the next corner.
  10. What he said, r.e. end mill type, chip evacuation and flushing are key. Also, with UHMW (aka delrin), you cannot rough cut slowly. Don't baby it. It builds up too much heat even with good coolant flow. Chip loads in the .004 to .008 range work well for me using 3/16" 2 or 3 flute cutters just long enough to do the job at hand. You should mind your approach/exit strategies as well, delrin chips easily when you break out of a corner.
  11. How many serious crashes cost less than $4,500.00 to get going again? Saving even one major crash would likely pay for itself. Another post mentioned MachSim is 98% as capable as Vericut. Not sure how different that is from Camplete but seems MachSim would be an excellent investment.
  12. Was just getting ready to pull the trigger on a Camplete demo, too. Guess I'll have Vericut and ICAM come over and demo their xxxx instead.
  13. He said it helps with existing files, you said it's for new files. Sounded like he was using it to clean up existing files.
  14. hold length stick-out length gage length tool projection projected length ...all work for me.
  15. Momma always told me to never miss an opportunity. It's a straight-up bad solution, but the easiest to get where you need to be without a decent .set file. McMastercam really screwed the pooch with ActiveReports.
  16. Hahaha. 2000 is a very small run for us. As in a "Limited edition". Usually we're on the order of 50,000 to 100,000 per product line.

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