![]() I had to cannibalize my 3HP VFD I had bought for the mill so I could run my big bandsaw, so I will need to be in the market for something else. You’ll definitely want to think about using a G4 Dwell in your g-code though.ģHP is not too bad. Judging from the video, it isn’t real fast on acceleration, but it isn’t terrible either–about 6 seconds to ramp the entire range from S400 to S6000. The power supply is integral so you can plug it into either 110 or 220, and there is even a nifty LCD tachometer that shows the RPM. The motor is a brushless DC, so it should last a good long time. There is also a charge pump/E-Stop input. The controller is PWM-ready, so is easily interfaced to Mach3. Here is a video from cjdavis618 who also wrote a CNCZone thread on the controller: It’s $229 for 3HP and 6000 rpm as I write th is. I’ll leave this in here so people can find it, but I’ve gone back to thinking about a more traditional VFD setup. Unfortunately, the later threads I’ve read indicate the controller is not reliable and there are some questions about whether it really produces 3 HP. This seemed like a nice setup from Kelling if 3HP is en ough. Several of the long-time posters like the drive and it is a sensorless vector which is what I’d prefer (broad torque band to reduce the need for belt changing). Saw the Teco 7300CV written up in a CNCZone thread. This will give you the amount of cc’s per bearing.Ġ8 x 5 x. There’s a formula to get the cc’s of lube, it is the last to digits of the bearing number x 5 x. Here are the Nachi angular contact bearings he ordered from VXB: The gizmo on top is so the power drawbar can squeeze instead of push and avoid damaging spindle bearings… Ready to run, save bolting rather than clamping the motor mounts. Motor pulley to the right…Īnd here it is fitted to the top of the spindle case… Here the stack is assembled with the bearings. A gear had to be turned off the original…īearings will be used to support the sleeve… The sleeve contains the splines that engage the spindle. ![]() This conversion involves the part with the red arrow… Some pix and comments from his CNCZone thread:Įxploded view of the mill head. My newer inverter welding machine is connedted like that too, you just use the two 230 single phase leads and leave the third lead unconnected that would be used for three phase, it is derated some though. This is a common practice, and the VFD manufacturers usually provide instructions about doing this. Powering 5 HP off a single phase 230V circuit is doable, and since the VFD is acting as a soft-starter, and limiting the starting surge, it is much less problematic than powering a 5HP cap start-run straight off the same circuit. The current max current draw off of 230 V single phase for this inverter is approx I=(5 HP)*(746W/HP)/(230V * 0.85 * 0.85)= 22A (last two 0.85 factors account for the inefficiency of the motor and the VFD). This doesn’t mean you are drawing 8.7HP worth of current. ![]() Or to put it in more useful terms, you need to buy a more powerful VFD to accommodate your 5 HP motor, using the formula of (5 HP)* 1.73 = 8.7 HP. You just need to derate the VFD by a factor of 1.73 to account for only a single phase of power. You can use a 3 phase input VFD, and power it off of single phase. Use this information at your own risk! Running a Three Phase VFD on Single Phase Power by Derating Spindles are hard to build properly, which is why they are so expensive. This page is currently in blog format as it is just my research notes for the project. CNC Mill Spindle: Bearings, Belt Drive, VFD, ATC, and Design Notes ![]()
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