Replies

1. 
   Notchman | Aug 19, 2006 07:47pm | #1

   Are your shop machines already 3-phase?

   Where are you? (filling out profile is helpful;SSN not required).

   Building with SIPS sounds fine; nothing special about it except learning curve and basic design of the building. 

   But the 3 phase Q kind of threw me.  Are you a commercial shop?

   Tell us more.

   Welcome to Breaktime!

2. 
   TomMGTC | Aug 19, 2006 10:15pm | #2

   I'd be surprised if you can get 3 phase powerat a reasonable cost. I use a rotary phase converter and it works fine.

   I just built a house with SIP's and really liked the whole process. I found them very easy to work with.

   Tom

   Douglasville, GA

1. 
   user-187938 | Aug 20, 2006 05:28am | #3

   I'm in Chicago. I am not commercial, but the SawStop comes with a 3 phase option. Nothing 3 phase yet. To be honest is there a good reason to go 3p? I will not be ripping that much 12/4 stock. Can you give me a ballpark figure about the cost of putting it in there (% more than regular 110v and 220v)? My thinking is that I should wire the shop once and give myself as many options as possible. I can see myself buying used commercial size tools.

1. 
   caseyr | Aug 20, 2006 08:18am | #4

   I thought briefly about 3phase but found the cost for the power company to upgrade the service to be more than I wanted to pay (buy two new transformers, new service line, etc.) plus they added a monthly surcharge for 3 phase. The advantage for 3 phase is that used heavy duty equipment is much cheaper than used single phase stuff approaching the same quality. Also, if I remember correctly, speed control is much easier with 3 phase. I have seen some rather large used 3 phase welder go for cheap when people were paying much more money for single phase units. Some of the fancier inverter welders seem to be available only in 3 phase. If you do a Google search on "rotary phase converters" you should see a couple of articles on how to construct your own phase converter using an old 3 phase motor (old 3 phase motors are generally availble for very little money). While the resulting converter doesn't provide exactly equal voltage on all three legs, the result is generally quite satisfactory to run power equipment. Of course, there are a number of companies that will sell you a commercial version of the same converter as well as some others who will sell you electronic converters which will keep all the legs equal, should you desire same.

2. 
   Brian | Aug 21, 2006 05:32am | #5

   Unless you are running a very large operation, 3 phase doesn't make sense.  It is very expensive to have installed.  I was quoted $15K + monthly charges.  It may be cheaper if you have close industrial neighbors.

   Older 3 phase equipment can be cheaper, but it is still older equipment.  A rotary converter can be bought for less than $1K if you happen across a bunch of great 3 phase stuff.  We had a large planer & used it for that, but still re-motored a big table saw to go to 1 phase (just $300 for a 3 horse motor for a Powermatic 66)

   The advantage would be that 3 phase motors use less electricity overall, but smaller operations will never see the savings.  My 1 phase table saw rips thick stock the same as a 3 phase would.

    

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