On Sunday, January 6, 2013 7:13:42 PM UTC-8, jon_banquer wrote:
On Jan 6, 7:06*pm, BottleBob wrote:

On Sunday, January 6, 2013 3:46:18 PM UTC-8, jon_banquer wrote:

http://youtu.be/J1jvt1A4_Uk



* Let's see what the approximate Horsepower of that cut is.



Material Removal Rate

MRR = WOC X DOC X FEED RATE



* * * *.500" X 1.500" X 120 IPM = 90 cu.in. MRR



HP = Unit HP (.25 for Alum.) X MRR



* * * * .25 X 90 = 22.5 HP



Now the Haas VM3 specs say the max torque is 90 ft-lb @ 2000 RPM



Torque X RPM / 5252 = HP



So 90 X 2000 / 5252 = 34.3 HP



* * *Lower the RPM from 3,000 to 2,000 and the Haas should theoretically be able to do the cut.



http://www.haascnc.com/mt_spec1.asp?...LD_MACHINE_VMC



--

BottleBobhttp://home.earthlink.net/~bottlbob





All that does is prove how Haas plays games with HP ratings.



IOW, Haas lies and their HP rating is next to meaningless for real

world machining applications.



When Haas Automation needs to get the job done for their own

production at their Oxnard facility they rely on Japanese machines.

Nothing like having confidence in your own product.

Jon:

As you should know, virtually all electric motor driven machine tools have HP and torque curves.

Here's a blurb from Makino:

================================================== ======
http://www.prototypetoday.com/news/makino

Flexible Job-Shop Production Capabilities
Designed for flexibility and high productivity, the PS-Series’ standard 14,000-rpm CAT40 spindle (HSK-A63 optional) offers the ideal blend of speed, torque and horsepower for today’s competitive job shop environment. Duty rated at 33.5 HP (24.2 HP continuous) and 130 ft-lbs peak torque (70.5 ft-lbs continuous), these spindle characteristics offer efficient, highly productive machining over a wide range of materials. Large-diameter bearings, air-oil lubrication and jacket-spindle temperature control deliver long-term thermal stability and stiff, rigid, chatter-free cutting.
================================================== ======

So is Makino "lying" when they claim to have 33.5 HP, when it actually only has 24.2 HP available on a continuous basis? Ahhh yes, Truth in Advertising, such a vague and indistinct concept. LOL

--
BottleBob
http://home.earthlink.net/~bottlbob