Need Help!- vibration problem

[greko]

hello all this is my 1st post
I quite often have vibration problems with the type of work i do on fanuc based machines
just wondered if there is anyway of copying what Haas have, which is putting an m code in (m38-39) to fluctuate the speed slightly up and down from the programmed spindle speed whilst machining.
is there anyway of doing this with Fanuc control
Be grateful of any help

[g-codeguy]

Not that I am aware of. Why not use G50 to limit the speed below vibration level, or use the spindle override control?

[greko]

cheers g-code guy i was hoping for something where didnt have to manually do overide switch as quite long cuts some of em wondered if there was something in parameters thanks again

[Daewoosan]

I spoke to Fanuc yesterday and asked them the very same question, and was told that there was no way to fluctuate spindle rpm while turning. I have had good results reducing chatter by increasing my finish allowance to a minimum of 2/3 the tool nose radius, and the usual jockeying of speeds and feeds.

[Jokeri]

Originally Posted by Daewoosan I spoke to Fanuc yesterday and asked them the very same question, and was told that there was no way to fluctuate spindle rpm while turning. I have had good results reducing chatter by increasing my finish allowance to a minimum of 2/3 the tool nose radius, and the usual jockeying of speeds and feeds.

What kind of part are you making and what kind of bits are you using??