On 2008-07-17, Pete C. wrote:

Ignoramus20788 wrote:

On 2008-07-17, Pete C. wrote:

Ignoramus20788 wrote:

On 2008-07-17, Pete C. wrote:

Ignoramus30183 wrote:

I wired the VFD to the lathe. Not in the best way yet, but enough to
experiment. Toshiba VF-A3 3.7 kW VFD, similar to what I sold to Pete
C, only bigger and with cracked top cover. (I have more for sale, 2.2
and 3.7 kW)

The first of those VFDs is doing nicely on my Bridgeport.

That's very nice to hear. I am delighted.

The second, along with the 3HP motor from my former RPC is looking
like it will end up replacing the aged 1/2HP motor with failing
starting cap on my lathe. I really need to find a bigger lathe
too...

3 HP motor to replace a 1/2 HP motor???

Why not? There is room to install it, being a 3ph motor it's pretty
compact, and being on a VFD I can set limits wherever I want.

Sounds like fun. I hope that if something gets stuck, the bigger motor
would not break gears or something.

Just have to set the current limits appropriately. Also with two stages
of belt drive, a slipping belt is more likely.

What you may find, and here I am NOT speaking from position of
knowledge, is that your big motor will draw big current even at low
load. What will change with load, is more power factor than current.

But who knows.

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