Optimize parameters for mills with tips 2

[metalworkerr]

Hello

Thank you for entering in my post

How important is optmizining parameters for mill with tips?

We assume we have a 50mm cutter on the same pass (same plunging depth, same spindle speed)

If we machine this pass with a feed of 800mm/revolution rather than 1600mm/rev (optimized)

Can we say that we are not only taking double time to do the same job but we are also wearing the tips?

I remeber that the supplier of the tips normaly gives you the contact time (the actual time that the tips can be used to take material off) and after that you should change them or at least checking them to see if they can do more than that


Can we say that optimizing paremeters saves time and tips ?

Any suggestion according his matter will be very appreciative

Tnank you in advance for your help

 

[MikeHalloran]

Uh, 800 mm of feed per revolution is a crash.
800 revolutions per mm would be fine feed.

I assume that 'tips' refers to consumable inserts. Take note of that word, consumable. They're not intended to last forever.

Machinists being paid by the hour will tend to use very fine feeds and low speeds so that the inserts they have will last a very long time. ... and coincidentally, any given job will take them a long time to finish.

If the machinists are being paid by the workpiece, and don't have to pay for the inserts, they will push the inserts to get the production rate up until the inserts will reliably produce one workpiece but will break if asked to make two. The resulting parts may or may not be satisfactory, but they will probably be hot.

The sweet spot for an enterprise that has to pay for its own inserts, pay its machinists, make a profit, and also optimize the quality of the parts produced, is somewhere between those extremes. Your insert supplier will be happy to guide you to a starting point that's probably not far off. From there, you can develop a spreadsheet to track metal removal rate, insert life, part quality, etc., and further optimize things for yourself.



Mike Halloran
Pembroke Pines, FL, USA

 

[BillPSU]

You do not machine 800mm/revolution you are probably meaning 800mm/minute feed rate. Plunge cutting will probably need to be done at a slower rate then the flat milling rate. Depending on the material your cutting rate needs to be about .07mm per tooth per rev. up to about .15mm tooth per rev.

Your tip usage will greatly depend on the material you are machining. Coolant usage will also have an effect.

 

[metalworkerr]

Thank you very much BillPSU

 

[metalworkerr]

Thank you very much indeed MikeHalloran I did start your post