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cherokeechief79

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Everything posted by cherokeechief79

  1. we have a large shaft that needed a big 3 point polygon on the end of it. its about 7 inches dia in the polygon area. i attemted to make a sample of the mating part in our wire edm. there was a very close tolerance on the shape and i could not figure out how to program it. usually i draw it in mc and bring the dxf to the wire. because its not an arc at all it became tiny lines that the wire would not like. it seems like it would need to be figured out by the machine much like an arc is done internally in the machine. apparently there were only 2 companies in the us that could cut this. when i looked it up it looks like it was done on a grinder which followed a cam much like before the age of cnc.
  2. meaning what its actually measured from the 2 low points of the 5/8 diameter? this would mean they are measuring it correctly by counting turns out.
  3. i was told to drill the hole to the min depth as possible.i went about .15 beyond the .250 depth of where i thought the correct depth was. what i should have done is not important now. im just trying to find out for my own knowledge if the thread depth should be taken from the highest point on the 5/8 round or should it be taken from how many turns it can be screwed out from the bottom. the sideview on the print shows a hole woth the shoulder at .25 deep and threaded to the bottom right up to the shoulder. it seems to me measuring how many turns out would be tread "engagement" not thread depth. our QA dept is making this claim.
  4. the hole is also countersunk so i think that screwing a gage in and counting how many threads it takes to come out is inaccurate on a curved surface like this.
  5. i have 2 questions that im curious about that maybe you guys know the answer. i have a 5/8 round shaft and it has a 1/4-28 tapped hole in it that states .25 min depth. they want the hole depth minimum as well. we went to about .350 to the shoulder and if you measure the length of a screw and thread it in and subtract whats sticking out we get more than .25. the part has failed for being about .02 shy. thats less than 1 thread. they claim you cant measure it to the highest point of the 5/8 round. its no big deal i can fix it but i thought i could measure it this way. the other question is with threads cut on a lathe. its a j thread and has a large root radius. it chatters slightly and you cant really see it well untill you look at it with a loupe. are there any rules for rejection of threads with slight chatter? does it go back to the title block which states the min (usually) surface finish?
  6. anyone running one of these?ive got to help out another department here that has one.they have a mastercam seat with a post for this machine. right now they are programming everything by hand. its a 5 axis machine but i just want to do some simple things in 2d to get familiar with it.
  7. i need to write a simple subprogram for one of our 3d printers. how can i make a sinple sub that x y zero are in the center. i want to do a G02 circle with a .125 rad lift go out .05 or so and do another circle . basically just advancing a little larger each time. i would repeat the sub with an L repeat. im very familiar with all of the sub portion of it but is there a way to keep changing the I or J without writing it each time? i know i can do it with a simple macro but thats not possible on this machine. thanks
  8. i have a test to give students and one of the questions is ......why is grinding allowance left on the workpiece prior to heat treatment process. a.....material shrinkage b.....material hardening c....material distortion d....material expansion the answer i have here is a but couldnt it be c as well? i dont want to give a misleading question.
  9. we are getting through it but its taking a long tim.weve got 24 of them and each has 2.5 full days of work into them even running overnite. I have this op in the 5 axis now but even 5 axis doesn't help at this point. its only a .438 square so drilling the corners isn't even an option because the overlap so much. we are using Harvey long 1/4 in mills too.
  10. we are getting through it but its taking a long tim.weve got 24 of them and each has 2.5 full days of work into them even running overnite. I have this op in the 5 axis now but even 5 axis doesn't help at this point. its only a .438 square so drilling the corners isn't even an option because the overlap so much. we are using Harvey long 1/4 in mills too.
  11. thanks for all of the ideas guys. I also forgot to mention that there is a 12 deg wall on one side above it as well. the endmill needs to cut into this wall about .02 at its deepest making things even worse.
  12. I cant have all of that folded over crap at the bottom.we rotary broach too.
  13. we have a wire edm but not a sinker. it cant be done with the wire because there is a round in the center of the square and it also does not go through the part completely. I wish I could share a model but I cant. im getting it done this way but its just in the tolerance. I was just wondering if any of you encountered something similar...…….now back to tapping the 4 mm holes deeper in the same part.another nitemare as they are way too deep to threadmill!)
  14. drilling the corners wont work because its a flatbottom and .125 rad corners doesn't leave much left in a .438 square. leaves just a stalk in the center which would be just as much of a nightmare. we tried dynamic but even .0005 or less it would scream. the pocket is +- .01 but its really just - .01 because its right against a wall and cannot go bigger. sending them out for edm is out of the question right now.
  15. I tried that ….it walked all over the place.the square hole looked like gumbys head! we had great success on the setup pc which was aluminum.
  16. ive got a square pocket to put in a part im making. it is .438 square and about 4 inches down right against a vertical wall in 316 stainless. It has a .4 hole through the center so theres not much coming out but the corner rad is .125 so I can only use a .25 endmill that is 6 in long. the pocket is actually only cutting about .7 deep and needs a square corner so I cant broach it. im cutting it now by spiraling down about .01 per pass and its working but tapering about .01. ive made the corners about 135 in mc so it can contour even though its very little. any ideas?
  17. its 1.125 high 8.5 x 8.5 and im using a .75 bull w a .06 rad. sure wish I could keep makin them out of aluminum!
  18. im machining a part that has a pyramid kind of shape. I got a nice toolpath using surf high speed area rgh and a .75 bullmill. im using this for roughing and its leaving .075 steps in the walls from my stepdowns. ive seen some of the other toolpaths use stepup as well to get rid of some of the material but it doesn't seem to be in this toolpath. the next tool finishes the walls and its a .375 ball. the sample I made was aluminum and you could see in the finish where the material was heavy. now I just started the run but its 15-5 stainless which has been very rough on op 1 which was actually very simple. I guess I could run another ballmill over it first with a big stepdown but less than .075 using a waterline cut. is there an easy way in area rgh to do it without adding a ton of time to the part?
  19. ive never done this.could you link me up to somewhere that shows how to do this?i looked all around on the page I define the tool on but do not know how to save the geometry.
  20. thanks david.yes that is how the insert is oriented like the Mitsubishi one you linked to.i found a bar in the mc tool list that was similar but 55 deg.it will work for what we are doing.
  21. I thought I was able to do it in the parameters somewhere.ill try that way though. is there a bar somewhere in the 2020 standard library that has the orientation close to what I want? should I use rough for a cycle and change it to cutting down?
  22. I know ive done this before but for the life of me io could not figure it out tonite while trying to teach students. we have a concave circle we are cutting into a 4 inch ps of aluminum.it is going to be a captain americas shield for one students project. we have a boring bar with a 35 deg insert that points almost directly forward giving up plenty of room to bore the radius to the center. I picked a boring bar and used a 35 deg in mc but I want to rotate the inset so it points forward.how do I do this?
  23. I had to make some tapered pins about 5 in long. I got everything and parted them off just over the length. now I need to put a large radius on the largest end. any good ideas on how to hold them? I could have formed most of it with the part off tool but they need to look much better than that.
  24. im teaching some students how to manually program a multiflute threadmill. I want the threadmill to feed down to the bottom of the hole ,go out to the size with comp and then do one counterclockwise circle with a z height equal to the pitch. the pitch was 12 tpi so we went down -.5 and then did a helix up to -.4166 which worked but we shouldn't have to calculate the difference between the two. I thought incremental would do it but the machine alarmed out and did not like this at all...….G91 G03 X0 Y0 Z.08333 J-1. if I just use G91 G03 J-1. Z.08333 it runs fine. I always thought I had to command an endpoint for the g03. with a GO2 or GO3 and a circle center programmed will it always make an arc automatically right back to where it started?
  25. thank you all so much for putting the time and effort into this

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