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Forum topic by bmckenna posted 02-27-2016 01:49 AM 419 views 0 times favorited 6 replies Add to Favorites Watch
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bmckenna

4 posts in 330 days


02-27-2016 01:49 AM

I am in the process of establishing my first shop. I had been scouring CL daily for used equipment and came across a “package deal” (Grizzly 8” jointer, 15” planer, 40” lathe, 48” Edge sander, 3hp DC, 17” Band saw, 8” grinder, Dewalt sliding CMS, PM 14” bandsaw, PM 17” DP and PM 66 5hp 3ph), all in great condition for under 3k. Thought I got a great deal and got a full shop in one shot, so I am excited and can’t wait to get my shop built.

My question is, since my TS is a 3ph (PM66 made in 98’) my thoughts were to either sell it and purchase say a Grizzly 0690 or replace the motor to a 3hp 1ph (sell the 5hp motor) or run a VFD. If I replace the motor, what else needs to be replaced? Switch? If I run a VFD, what HP rating do I need 5 or 7? I am looking to make a decision that makes the most financial sense but also want to be happy in the long term. Any suggestions are welcome. Thanks in advance


6 replies so far

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MrUnix

4229 posts in 1663 days


#1 posted 02-27-2016 01:55 AM

Under $200 for a VFD and you will get a bunch of benefits not possible with a single phase machine – not to mention that 3 phase is more efficient and more robust. Ignore HP ratings, they are BS. Size based on FLA. A 3hp Baldor with a 7.4A FLA can be run on a “2hp” VFD which can do up to 7.5A. You can then sell the mag starter to recover some of the money.

Cheers,
Brad

PS: Considering selling the PM for a Grizzly is, IMO, insane.

-- Brad in FL - To be old and wise, you must first be young and stupid

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BurlyBob

3688 posts in 1730 days


#2 posted 02-27-2016 01:56 AM

I don’t understand why you want to get rid of the PM 66. It is arguably the finest table saw out there! The 3 phase might be a minor issue, but it’s not insurmountable. I’ve used PM 66’s and they are really hard to beat. I’d opt for a replacement motor.

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knotscott

7215 posts in 2840 days


#3 posted 02-27-2016 02:02 AM

Assuming it’s in decent condition, I would keep the PM66, and do whatever is necessary to get it to meet your needs.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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bmckenna

4 posts in 330 days


#4 posted 02-27-2016 04:27 AM

Thanks, I would certainly like to keep the PM66 given that it is the “gold standard” and is in good condition, I was leaning more towards motor replacement, this way I know the motor is good to go for a long time. I was only considering selling it if you all thought that’d be a better option. If I replace the motor to a 3hp, do I need to change out the switch as well? Would you go with the Baldor or would the Leeson be sufficient given that it is about half the $? Thanks again

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MrUnix

4229 posts in 1663 days


#5 posted 02-27-2016 04:47 AM

If you swap out the motor with a single phase one, you will need to tinker with the mag switch to get proper overload protection and might need to beef up some wiring. If you are concerned about the 3 phase motor, the only thing that can go bad on them is the bearings (there is no start circuitry, centrifugal switch, start capacitor, etc…), so if you replace the bearings (about $10), you basically will have a new motor and will last a good 20-30 years before needing new bearings again. With a VFD, variable speed and soft start is a nice bonus, and since it provides overload protection already, you can get rid of the existing mag starter so wiring will be super simple (not to mention much cheaper than trying to replace the motor).

Cheers,
Brad

PS: I’m not sure how long ago they switched to the ‘gold standard’ slogan, but for most of their history, it was simply ‘better by design’ :)

-- Brad in FL - To be old and wise, you must first be young and stupid

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bmckenna

4 posts in 330 days


#6 posted 02-27-2016 12:59 PM

Thanks Brad, good point on the bearings in the 3ph., sounds like the most economical choice is VFD, replace bearings. I wasnt even aware that their slogan was ‘Gold Standard’, guess i don’t pay much attention to marketing.

Thanks again,
Brian

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