|Forum topic by ErikF||posted 08-10-2016 12:40 PM||962 views||0 times favorited||2 replies|
08-10-2016 12:40 PM
It would make sense that an auction selling a 20” jointer would also be selling a large planer. I also bid on this planer and won it at $330.
Here she is in all her glory Powermatic 225 24” planer.
When I first got into woodworking I was intimidated by any machines needing more than a 110v power supply because it meant running new wires and adding a breaker…and that was for single phase. Once I branched out into metalworking machines I found that 220v 3phase was the norm for machines with 1hp and up, I really wanted to add one to the shop so I started looking for ways to get the power. Here are the options:
- Have three phase power brought in from the pole (it’s typically not even available at the pole unless its a main road or industrial/commercial area) and potentially spend a lot of money. It was going to cost me $8,000 to have a line run to my shop and there was 3 phase across the street.
- Rotary phase converter (RPC)
A 7.5hp RPC is a 7.5hp 3 phase electric motor which is wired to your 220v single phase source
220v single phase will not start the motor by itself so there is a need for start capacitors, a “pony motor” (single phase motor) to start the three phase motors rotation, and if you’re really trying to save some money you can wrap a rope around the motors shaft and pull it to start the rotation.
Once the motor is spinning at full speed it “makes” your three phase. From here you can run a wire to a switch or breaker made for three phase power. This will run your equipment.
An issue I have had with the VFDs is the need to run them directly to the motor VS whatever controls are on the machine. I don’t think this applies to every application, but the machines I have don’t have switch/relay boxes compatible with the power. The VFD becomes my switch and gets mounted where the switch would normally be. This isn’t necessary using a RPC.
Bellow is a picture of my ghetto shop I took yesterday. Not exactly an OSHA poster but it’s in the process of being setup and the machines all run beautifully. In the picture:
-Planer (3 phase)
All are run off a RPC which is wired into my 100amp single phase box. May be better ways to do it but this is my method so far and I haven’t had any problems. Factories upgrade equipment regularly and often sell off old stuff at scrap prices. Not every piece is a beauty but good deals can be found. Of all the machines listed above, the Powermatic 225 has been my largest investment.
Oh yeah…you’ll need a forklift or cherry picker to move all the cool tools inside. :)
-- Power to the people.