gang milling

[Dave_noob_user]

Hi guys. I know this isn`t Mastercam related but I have gotten some good answers from you all before and figured you could help me out. I wasn`t sure if there was anywhere on these forums I could post this question. Anyway. If I had 2 3" cutters, a 1" cutter and a 1 and a half" cutter, how do I calculate the speed for it considering the cutter dias are different? I know the formula for cutting speed (cs*4/d) except since there is 3 different dias, how would I figure it out?

Thanks in advance.

[Guest]

I don't know if there is a specific formula for that situation.

 

Not knowing if there is, I would use the largest diameter cutter to set the the SFM.

 

The small dia's will be slower but that is better than the large cutters being too fast.

 

If you're cutting aluminum it might not matter a great deal but any type of steel and you would burn your cutters out if you ran them to fast.

 

JMHO

[Hardmill]

Why cant you have different speeds??

As john said if you must calculate for the larger dia.

 

 

PEACE

[Dave_noob_user]

Can`t use different speeds because there all cutting at the same time unless you were referring to something else. Thanks for the answer though. Cheers.

[Dave_noob_user]

Do any of you know of any other good machinist forums?

[Tom Szelag]

Definately calculate both speed and feed from the largest diameter cutter. That way, it is running at a safe, efficient rate and the smaller cutters are running slower (wont burn up or break).

[Kevangel]

You must be using a horizontal milling machine with an arbor? Yup figure for the largest dia. one ( in some sense the weakest link, so you don't burn the rest up))

[Guest CNC Apps Guy 1]

In that situation, I'd set Speed from the Largest Dis Tool and feed to the smalles dia. tool. Otherwise you could be feeding too aggressively for the smaller one.

 

HTH