High feed milling on haas VF6

[pato-drz]

I everybody
at my shop we do some mold and the average size of the mold is 20 X 20in
and the haas can take a cutting feedrate 500ipm
but i programming my feed at 315ipm with a bullnose 3/8 with corner radius 1/16

And the problem is the machin can't not keep this feed the average of the actual feed is not more 80ipm when the bullnose do a shape on a mold.

the method of programming is point to point and i want to know if that's better if i program with G02 G03 and in the machin we have take the option HSM combined with full look-ahead of up to 80 blocks...)

I search some tricks for having a better feed on the machin.

Thanks you guys

[AMCTony]

You will need to have High Speed Machining option on for this kind of feed rate. Using arcs (G02 G03) is much faster than using point to point even with the HSM option on. It means less blocks of code and thus faster processing in the control as well as faster transitions from one block to another. The machine looks at point to point as go from one to the other and decelerate for a direction change. Arcs that flow into each other mean little or no deceleration and fast feed rates.

[lghtspeed]

Less blocks of code is not a good thing. The more blocks of code, especially on an arc is faster for a machine to traverse and is more accurate. If the machine is old and cannot handle mass volumes of information then you will not be able to handle most "high speed machining".

[Catchme]

Youll need NURBS interpolation to feed at that fast of a feed rate. The machine cannot hit all those points without slowing down, causing axis chattering and pounding the snot out of your machine axis motors. There are parameters for axis acceleration and deceleration that will come into effect at these speeds. Either slow down and cut in arcs, or output your toolpath in NURBS. P.S. If youve selected the proper tools and cut parameters you dont need to go that fast. Make time with a proper cut and not by abusing the machine.

[universalfab]

I've told this to a buddy of mine who likes to run the crap out of his machines, it makes no sense to put that kind of wear and tear on your machine for these jobs. You'd be better off buying another machine to run at the same time instead of running that 1 machine so hard. Repairs are very costly and totally dwindle your proffit margains down. Take it easy and breaking a arc down into more moves is slower, but more accurate.