I assume that was a typo? 0.04" deep for 0.4HP.
Are you going to have a high and low gear? 6000 x 1.5 = 9000 RPM. The two motors you linked two list an RPM of 3600 continuous. Are the bearings in the motor good for it?
So you're just looking at what HP you need at this point. OK. There are the three types of motors I previously mentioned. You need to find out what kind of motors they are, what the power vs speed graph is through the RPM range you want to use, what short term power you can get in addition, and what max speed you can drive them to. I'd send Leeson an email. I can't answer those questions. Any reputable motor manufacturer should have that data compiled.
You original question was how much HP is necessary. My best answer is that it depends on the motor curve, the gear ratio, and what kind of HP you need at different RPM. So essentially what I am saying is that two different 1HP motors will perform differently at different speeds and that the real question is, what motor should I use for my project, I'd like to keep it as small as possible?
Of course arizonavideo has actually done this with good results. I checked out your youtube channel arizona. nice. I wonder what he used?
If you look at the power vs speed curve of an HSD spindle, for example, there is a very large difference in available power output continuous and short term. They show this right on the graph. I looked at some made in China HSD clones on EBay, and they actually list the power output of the spindle at the short term output if you look at the graph. So the two are not comparable, the HSD one is far more powerful for the same listed power of spindle.
I have to assume that the amount you can overdrive a motor in the short term is dependent on the manufacturer. Perhaps there is a standard that I am unaware of. I'll let other people discuss what that might be. I don't know.
I've never heard this before. How do I input parameters on a 220V VFD to drive up to 308V? Are you saying that I can input a V/f curve and set 308V at the top end on a VFD that has 0...Vin listed on the sticker as the output and is made for 220-240V normal a/c power? Like a single phase to three phase VFD running on house power, it will actually let me input a value of 308V for the output for use on my v/f curve?
Or are you saying that this only happens on specialized VFDs that are being run in constant torque mode? The kind used for pumps, and not for CNC machines?
I'm not disagreeing or trying to be argumentative, I honestly would like to know if this is possible for my own project.