Gallery, Projects and General > How do I??
Maths help please: Approximating a Flat Iteratively
awemawson:
As you suspected Archie, it was the fact that the X travel was going negative that was upsetting things. I ended up forming the modulus of the evaluated travel distance by multiplying by -1 if it was less than zero, as the controller doesn't appear to have a modulus function.
I had to do a few more tweaks regarding loop values now that the angle are bigger, but now it works for start=0 and start =180 degrees. I suspect that it will fault if asked to cut a flat where the angle goes through 359.99 but that's for the future - as predicted the flat AF is 18.02 so that's good :thumbup:
This is just one feature of a series to make a part (CNC CAT40 special Beaver Pull Stud) to try and avoid second ops off the lathe
Archie Opteryx:
Andrew, those flats look very good, It's great to see the final result :clap:
The spanner seems to be a good fit on them too. They could almost have been made for it :lol:
I'm curious to know how you intend to program the rest of the part. Are you going to write all the g code for it by hand, or are you going to use a CAD program to generate the other features?
awemawson:
Archie, I've had an Autocad sketch of the stud that I drew up years ago as these studs are now unobtainable. It will be a two operation process. Firstly I will thread a bit of suitable steel with an M16 stud with those flats on the chuck side, which will be parted off with sufficient length to make the rest of the part.
This will then be screwed into an M16 female 'receiver' in the chuck, and the stud shape turned to completion, the stud unscrewed (using those flats!) and the next blank inserted.
The thread I have modelled in FeatureCAM and the stud end I have yet to model. I have written a post processor for FeatureCAM that generates passable code for the Siemens control. I will probably hand stitch the bits of code together.
AdeV:
So.. I googled "CNC CAT40 special Beaver Pull Stud", found lots of pictures of similar looking things, and I still have no idea what it's supposed to do :scratch:
Looks nice though!
awemawson:
The 'pull stud' is what pulls the 40 taper tool shank tightly into the female socket in the milling machine spindle. It is gripped by a special finger collet. The arrangement performs the same function as the draw bar on a Bridgeport manual mill. Your interact of course has no draw bar as its presumably a QC30 nose?
Using the pull stud allows for automatic tool changing. There are many shapes in use and Beaver of course HAD to design their own :ddb:
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