additional cam bug @seth.madore

[johnptc314159]

 https://a360.co/307gsVd   if you run a round insert grooving tool on insert center the turned part looks like a ball which was constricted around the equator.  the insert center was correctly set in the lathe.......  the sim looks good ??

it seems any of my uses of round inserts  leads to trouble. also when you select round insert in tool editor ( grooving tool)the is no diameter call out so i assume it is the width.\

@seth.madore 

[johnptc314159]

this does not run any better with sq nose grooving tool:(

[seth.madore]

I can't quite tell what's going wrong based on the Sim. Can you elaborate?

[johnptc314159]

here is a pic with round insert, sq nose much the same

thanks

[johnptc314159]

using three tools this one is quite spherical 🙂  i need  to adjust one of the tool offsets to remove the depressed band  at equator 🙂   confirming that something is not quite right above !!

see https://a360.co/3cAJph1  

thanks

[johnptc314159]

do you need any other info from me  ?? @ seth.madore

the sphere made with three tools are good.

but the original posted piece is weird

or it seems anything with a round insert along these lines is problematic 😞

thanks

john

[seth.madore]

So, the post from Sunday links to a file that is using 3 tools. However, the .PDF file you attached shows an undercut on the equator. Is that what you got from running just the one tool as per your original post?

[johnptc314159]

three tools work great i tuned out the undercut no problems with three tools 🙂

review the first post the sphere made with either a round or square 'grooving' tool is not spherical see first pic.

 there is either pilot error or a bug.  the sim looks ok but the parts are not.  try a round insert with it set to insert center.  this takes extra work on tool setup on the lathe.   something is very wrong 😞

i would like to make the part with one round insert tool but cant see a way....   we know there is a bug profiling with a round insert but the grooving should also work ??

best

john

[seth.madore]

What post processor are you using for this? This "should" work, and shouldn't be giving you the result you're seeing...

[johnptc314159]

i have a haas st15 and i am using the post from haas. i believe the post is up to date but i will double check and check the exact name

[johnptc314159]

please see https://a360.co/2EILDys     one round tool per link

i ran it with the post from haas for st15 which is only 4 days old.

i looks like an egg  see attached please. 😞

thanks

john

[seth.madore]

The thing is, I'm not seeing either one of these show up in your actual g-code. Is the tool tightened, is the material deflecting on you, is there backlash in your machine?

[johnptc314159]

no its 2.25 inch bar stock no deflection no wear this is the only part thats way off. remember same lathe produces great spheres with three tools 🙂

is this related to trying to profile with a round tool which is a known bug ???????

i wont tell you how many feet of bar stock i have turned into chips trying this 🙂

do you know someone who could try running this part ???  should i contact haas ??

thanks

john

[seth.madore]

I'd gladly run this in my Doosan Lynx, but I don't have any full round inserts that have that depth of reach. I can get some on order to test this out, but in the meantime, I'd certainly be reaching out to Haas to see if they can spot something that's off in your Setup or in the code.

[johnptc314159]

 run a smaller version with a sq nose cutoff tool ??

i will contact my haas apps guy

let you know

😉

[johnptc314159]

i spoke with haas....they suggested trying some other compensation settings but like you and i believe it should be working :(.  I just ran "tip" compensation under tool setup..... not much different result and for completeness i will run tip tangent as well 🙂

best

john

[johnptc314159]

@ seth.madore

some better news using finish profile with lots of steps. see https://a360.co/2GuyUjG  

this produced a nice sphere within 0.002 inch of print. round insert setup ma 'tip'

i am still wondering about the other results ??

[johnptc314159]

so is this a bug or me ???  still screwy

thanks

[johnptc314159]

@seth.madore 

i ran a diameter test using vps ( haas canned cycles)   set 2.4500  part 2.456

i ran same tool ( normal turning tool) from fusion        set n2.4500  part 2.455

i ran round insert  vps set  2.4000 part 2.401

i ran round insert on tip tangent  set 2.450  part 2.451

i ran round insert on tip   set 2.450 part 2.4505

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

now i tried insert center set at 2.450 and set the tool coordinates to center of insert.....tool never touched part 😞

reversed the sign on the x axis offset just to check the tool was even further away from the stock etc

then left fusion at insert center and just set x with the atp ran it and still didnt touch the stock ( 2.5 in od)

HELP PLEASE !!

john

[Anonymous · Accepted solution]

I only glanced at all the posts and went straight for file so I can see what is going on in real time.

Here is what I learned, selecting round insert and trying to define holder in old tool library has a problem.

I cannot select custom holder and that prevents tool from being able to undercut back side.

The solution is to use round insert without the holder.

Noticed I also used 35 degree tool leading up to that conclusion.

In 99 % of my turning work I use tip tangent as that is in sink with how tools are touched off in machine.

You can also use center of round insert but after touching off tip of insert in machine you need to shift X and Z values to be in sink with programmed point.