Speed and feed rate for 1 1/4″ Carbide Index tool?

[Alvin SchlitterParticipant @alvinschlitter80339]

Please give me your thoughts

[Alvin SchlitterParticipant @alvinschlitter80339]

Hello All;

I just received a new 1 1/4″ indexable insert cutter for my ZAY7045FG/1

Milling machine. Are there others that have a similar tool? What I would like is the speed at which one should run the tool at as well as the advancement rate of the material against the cutter.

According to  Harold Hall in his book, Milling: A Complete Course  #35; he recommends a speed for 1/2″ HSS cutters at 500 RPM. Based on this a 1 1/4″ (31mm) diameter tool one should use a speed of around 200 RPM. However this is a carbide tool and one can double the speed or more.

I tried a speed around 400 RPM and the machine seemed to hammer a bit, I raised the speed to around 600 RPM and it sounded much better.  I checked the

tool and material after dry milling a fairly deep and wide cut and both where fairly cool.

 

Please provide you thoughts!

 

[Eric CoxParticipant @ericcox50497]

What material are you cutting ?

 

[CirclipParticipant @circlip]

Don’t forget the NUMBER of teeth on the cutter Alvin.

 

  Regards  Ian.

[Alvin SchlitterParticipant @alvinschlitter80339]

This particular cutter has 2- Inserts in the head, the material that I most often cut is low carbon steel!

[Ian S CParticipant @iansc]

Alvin this won’t be much help,but when I bought my mill,and got a 50mm,3 insert cutter I asked the salesman what feed rate and speed and depth of cut I should use,he said give it a couple of mm cut at 900rpm,and crank like hell.I usually try for a 1mm cut at 540rpm,and I could not quote a feed speed,I just go by feel,afraid all I know is what I taught myself.Ian S C

[Eric CoxParticipant @ericcox50497]

Low carbon steel has a cutting speed of approx.300 fpm. dependent on hardness with a carbide cutter .

 rpm = (fpm * constant)/cutter dia.

 

 = (300*4)/1.125 = 1066 rpm

[Ian S CParticipant @iansc]

Going by that figure I’m not too far away,the figure for 2″-50mm = 600 rpm, my 540 rpm is not too bad,and a bit better than the 900 rpm quoted to me by the “expert”!Ian S C

[CirclipParticipant @circlip]

How would the machine cope with 1066RPM and 1/4″ depth of cut??

 

   ——- Walkies???

 

     Regards   Ian.

[Eric CoxParticipant @ericcox50497]

Look at these for info on speeds and feeds

 

 http://en.wikipedia.org/wiki/Speeds_and_feeds

 

http://its.fvtc.edu/MachShop3/speedCalc/SpeedRPM.htm 

 

 Oh, by the way circlip, weld the machine to a metal table, bolt table to a concrete plinth. QED.

 

Edited By Eric Cox on 23/01/2010 11:22:00

[CirclipParticipant @circlip]

Wish there was a thumbs up Smilie on this Forum Eric.

 

   Regards Ian.

[Martin WParticipant @martinw]

Ian

 

 

Nuff said

 

Martin W

[Author]

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