Speeds and feeds for high speed machineing 1

[MegaMag3]

I run a Makino Mag3 with an HSK80 spindle my max Horsepower is 107 at 33000RPM'S I can feed 1000ipm (25400mm/min). My question is what is the best way for determining a starting point for speeds and feeds? I understand it depends on the application but would like to develop an accurate starting point. Harmonic's is key I know but I have no equipment available to do that any suggestions?

 

[MikeHalloran]

Buy a book?
Make a test cut on a piece of scrap, ramp the parameters, and listen?
Start with feed/speed within the capabilities of a lesser machine, and ramp up from there.
... (until something breaks? ; expensive)
... (until edge wear gets excessive? ; maybe reasonable)
... (until Metal Removal Rate approaches your machine's limits ; did it come with a Help file?)





Mike Halloran
Pembroke Pines, FL, USA

 

[MiketheEngineer]

I would thing the MFG would have the info you need.

 

[ornerynorsk]

Every tooling manufacturer publishes information on speeds and feeds. This should only be a starting point, subject to your actual conditions. There is no magic formula.

Mike Halloran mentioned the key aspect in dealing with machine harmonics - listen. Your ears will tell you. For someone with experience, your machine is singing to you, and you should listen.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[metman]

The suggestion of a book is good. I have a book on feeds and speeds for all different alloys and tempers. Sorry I cannot remember ht name of the book.

Here is what I use so I can figure the speed in my head (as a starting point):

The book value for mild steel in feet per minute tangential velocity equates to approximately 400 rpm for 1" dia using a high speed steel cutter. So now in your head you can divide the number 1 by the diameter of your work piece or the dia of the cutter depending on whether the work is turning or the tool.

Example: 2" dia cutter; 400/2 = 200 rpm

For carbide cutter multiply by 5; 200 rpm x 5 = 1000 rpm

For Aluminum workpiece, multiply by 5. Using High Speed Steel
tool bit, 2000 rpm at 1" dia. For carbide multiply by 5 again; 10,000 rpm for 1" dia. As mentioned above these are starting places.