I've been asking around in places where I thought I might have the best chance of getting a good answer or even some suggestions on how to go about dealing with tool Chatter on inside corners. Back when I first bought my Tormach 770 I could swear I came across a video tutorial that explained what I might be able to adjust within the SprutCam software to change the feeds and speeds or WOCs/DOCs in order to mitigate or stop the chatter when my end mill got into those inside corners. I contacted SprutCam USA to ask if they had put out such a video but it turns out they had not; at least according to the guy who replied to my query, and to the best of his knowledge neither they nor Tormach had put out any such video.
I also contact Tormach about this but they never got back to me.
So I'm wondering: The HSM tool paths I'm currently using are working extremely well for me using the HSMAdvisor generated feeds and speeds; that is, until my end mill reaches those inside corners. Then I get the finger-nails scratching across a calk-board chatter that drives me nuts. It only lasts a couple of seconds each time but still, it can't be good for the cutting tool or my machine and it certainly doesn't do my surface finish any good although I do leave some material for finishing passes with a smaller end mill.
I wanted to ask you guys with more experience with these things; have you come up with a method of dealing with chatter on inside corners? I have a general understanding of the cause of this chatter and I have taken steps to mitigate it all together but to me it entails one or two more tool changes and if possible I'd like to allow the 1/2" end mill I have been using to continue its roughing tool paths without having to stop each time it comes to an inside corner. I have to note here that I actually have gone to a smaller diameter end mill to help stop the chatter but this adds time to the overall amount of time that it takes to machine the parts in question. Also; I know that I can run a drilling tool path before hand at each of the corners to help mitigate this chatter as well but, I'm hoping one of your guys knows your SprutCam software intimately enough to suggest a possible way to tweak the G-Code so as to not have to add any more tool changes to the running of these parts.
It's been a long while since I viewed the video I mentioned above but, If I remember correctly, the guy in the video I alluded to did something to the G-Code by going down the column on the left of the SprutCam screen toward the bottom where it listed the faces or the edges to be machined and he changed a few of the numbers there which effected either the WOC or the spindle speed. This was back when SprutCam 7 was all that was available. I still use the highest version of SprutCam-7 and I don't really want to spend any more money on upgrades and such if at all possible.
Does anyone remember seeing such a video? Is anyone SprutCam-Savvy enough to figure out a work-around within the G-Code itself for dealing with this kind of chatter? The guy from SprutCam USA that replied to my inquiry seemed more about upselling me the latest version than really offering any suggestions with the SprutCam version I'm working with now. So I'm asking you guys.
Crossing my fingers.
MetalShavings