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90% is kind of low. I have seen these machines go to 120% or even 150% without actually tripping out on overload. How does it sound before entering the cut, during the cut, and leaving the cut? Does the RPM actually drop?
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Hey,
This is the first Haas that I have been allowed to operate as I see fit. I am used to Okuma and Mori VM/HM's.
Today I am facing some A36 blocks with a 2" four-flute Sandvik Coromant Facemill. The inserts are TiN coated with a 0deg. lead angle and I am running the tool at 750 SFM and .012" LPT.
At an axial engagement of 1.6" and a radial engagement of .050" the spindle load is 90% but the motor in this machine tool is supposed to be 20HP so I am a little confused.
Is this the most I am going to get out of this machine or could it be damaged?
90% is kind of low. I have seen these machines go to 120% or even 150% without actually tripping out on overload. How does it sound before entering the cut, during the cut, and leaving the cut? Does the RPM actually drop?
http://www.kirkcon.com/
Well, it is supposed to be about a 5hp cut. Could it just be that the load sensor is sensitive?
It sounds like awesome for the most part. I need to get it off the extended holder but aside from that I don't see why it couldn't handle .015"-.020" LPT.
P.S. loses maybe 6 RPM
The load meter might be out of calibration too.
http://www.kirkcon.com/
5HP cut? I am confused. Our Mini Mill can barely handle the 1" Mitsubishi APX 3000 we have at light feeds. That is 7.5HP. I couldn't imagine trying to run the depths and feeds you are talking with a 2" mill! Maybe you can explain how your arrived at your 5HP cut estimate.Originally Posted by daedalus0x1a4
Mike
Welcome to HAAS!
Is this a 7500 RPM gear driven mill or the 10K or 15K Direct inline spindle?
I've noticed a huge difference in performance.
Well from what I calc'd I got around 2HP cut......
This is ass-u-me-ing that your terms are Backwards When you stated the Axial and Radial engagements
Radial is W.O.C. and Axial is D.O.C
Haha, oops. I mix those up a lot.
This is a 7,500 RPM BT40 spindle that I believe is belt-driven, I haven't had a chance to take the covers off and take a peak.
But yeah, it's barely a cut!
gizmo, I just used a hokey horsepower calculator at iscar's website, all my books are in a box somewhere and I forget the equations.
In short, your motor can't deliver much horsepower at slow speeds, that's why you want a gearbox when cutting a lot of ferrous materials.
In long, power is a function of both torque and speed. At low speeds, your power is limited by your torque. At 0 speed and full torque you will have 100% current and 0 mechanical power. The spindle is probably only capable of delivering 20HP in a small RPM range, generally down to half the nameplate speed (referred to as 2:1 constant hp). Below that, it goes into the constant torque regime, where power drops linearly with speed. Your load meter is a current meter so it will be maxed out in low speed high torque situations even though you are only getting a few HP out of it.
Matt
The 20HP is also a peak rating. Here are the torque/power curves for a 7500 rpm 20HP VF machine with no gearbox.
An open mind is a virtue...so long as all the common sense has not leaked out.
Thanks for explaining that and for the picture guys. Geof where'd you find that?
A friend sent it to me. I have several VF machines.
An open mind is a virtue...so long as all the common sense has not leaked out.
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