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Invertek VFD is a poor choice for a lathe, at least the current common smaller models sold in the US. Very limited number of programmable inputs and programmable features. Did a recent design/build...

Evidently you only like to pontificate endless nonsense according to the world of "Thermite", nor did you read the last line of my post. He already indicated that he felt the cost of the brake repair...

I have installed numerous VFDs on lathes that did not have a mechanical brake, and also many that do. The VFD on smaller lathes as others have indicated can stop the spindle in ~1 second, so is...

It is not the purpose to make this as an argument, and that it can't be done. The objective is that that the discussion is a bit moot for the case study mill application vs. the link provided use...

I did read you post, and do not agree with your fundamental premise that this is an acceptable approach in this application. That you would be running multiple dissimilar motors off of the same VFD...

You are not protecting either motor from overload, you cannot tune or adjust the VFD for the individual characteristics needed for each motor/controls. You are spending more than 3X the money at the...

You need to look at the VFD specifications/parameters and ratings. Most VFDs have motor parameters that need to be set for each application. There is typically a range of kW (amps) that can be set...

That will not work as drawn, you cannot use the current drum switch to turn on/off the motor nor reverse it as it will probably smoke your VFD. You do not use the magnetic starter/Heaters with a VFD...

If using a 2 speed motor, wire it for maximum Hp, should be 1750 RPM/ 4 pole. Do not waste your time with trying to use both speeds. If the motor was a 2P/4P (3500/1750) such as on a mill, I wire it...

I use the Hitachi WJ200 VFDs quite a bit at this size level, they are very durable and have a good range of programming abilities. I would recommend that or the Teco E510 (the L510 which is less is a...

So a few suggestions should you decide to go the VFD route. First, you would only go with a single speed motor, there is nothing to be gained with a 2 speed motor in this case. In fact, even if you...

Most factory VFD mills in this category (manual, 3-5Hp) use a TEBC motor to provide consistent cooling at both RPM extremes, which is more of an issue with a TEFC motor. I have also used quite a few...

You cannot stick in a single phase motor on a 3 phase machine and expect it to work the same. You would need to rewire the contactors/switch gear, and this all depends on the single phase motor leads...

Looks like a Teco N3 VFD. Set A000=0 General Vector. Manually enter the motor data and then run the auto-tune A006=1. The auto-tune does not detect all the motor parameters, only tunes specific...

Should be a direct connection between the VFD and the motor, so it is not for powering the surface grinder through any switched contacts. If price is an issue, the replacement Teco drive for the FM50...

One needs to put in perspective what is considered an "old" motor and the type of duty cycle/load that it will be called to do. On a lathe a VFD replacement is dependent on many factors, but I have...

If you go with a 3 phase VFD, the derating varies a bit and you should run a DC choke. So something like the WJ200-075LF (7.5 kW) these days, the WJ200-055LF (5.5 kW)would be marginal but I have seen...

You need to directly wire the motor to the VFD, depending on the VFD type and if you are running sensorless vector you can damage/destroy the VFD if suddenly disconnected from the motor while...

Agree, that a name brand 30 Hp VFDs may run you around $2500-$2800, then add a DC choke, enclosure, fusing, power switch/contactor and you may be pushing close to $3500 when all is said and done. You...

Depending on the duty cycle of the compressor/work hours, you may need to be running the RPC for hours on end, you need the space and need to deal the noise, etc. Depending on the compressor details...

In this size machine I see no benefit to a DC motor other than being much more expensive and complicated at this Hp level. Your best bet would be to pull the motor and take it to a local motor shop...

Single phase VFDs are common and reasonably priced up to 3 Hp. Beyond that typically one uses a 3 phase input derated to for single phase operation so a more expensive proposition. As far as...

Most newer 3 phase input VFD's I have encountered allow derated single phase input. There is some variations as to if L1 and L2 are used or L1 and L3, and in some cases if a jumper from L3 to L2 is...

Manual is informative:
Wade Tool Co. - Publication Reprints - Wade 8A Toolmakers Precison Lathe | VintageMachinery.org
Wade 8A Toolmaker's Lathe

The spindle is a 2" 10 TPI thread, so unless it...

I typically would recommend a 1750 or 1200 RPM 3 phase 60Hz motor on lathes and over speed the motor. You will have too much Hp loss with a 3500 RPM motor if you need to spin it below say 20 Hz (~700...