Is this the deal it seems to be?

Overmountain

Overmountain

Joined
May 2, 2013
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http://www.ebay.com/itm/320962106061?redirect=mobile

Will someone more up to speed (sorta-pun intended) with motors and VFD's tell me if this is the screaming deal it seems to be? My old grinder used step pulleys and a singe phase motor. Was 1hp (and I think a bit over-rated) and I could definitely drag it down with some stuff. 3hp seems like it will do the trick nicely on the new unit.

I have a scrounged up 2hp 3 phase washdown motor but no VFD. Just a decent VFD was looking like it was going to cost more than this listing.

I am trying to get this new grinder up and running. I'm back to my tricycle ATM and its killing me. Since HRH said this has to be a self-sustaining enterprise, and I have a forge project, grinder project, and new mill/drill I am nearly dumpster diving these days... (thank God for side jobs... My typical 2 months per knife certainly ain't ever gonna get me there...)

If anyone here is planning on getting married soon, one piece of advice: Don't get a joint bank account...



-Eric
 
7/8" shaft is the only obvious flaw I see, but you can turn the shaft, or bore the grinder drive wheel.
 
There is a guy on ebay who makes drive wheels for 7/8" shafts. I'm not seeing any way to adjust the speed so you may need to wire in a potentiometer. Seems almost "to good to be true" with free shipping.

Bob
 
RangerBobTX said:
There is a guy on ebay who makes drive wheels for 7/8" shafts. I'm not seeing any way to adjust the speed so you may need to wire in a potentiometer. Seems almost "to good to be true" with free shipping.

Bob
Click to expand...

Wire in a pot? Why? I thought the whole purpose of VFD was to adjust speed. Am I missing something? I'm used to pulleys and whatnot on single phase motors or simple PWM and ESC on DC motors. The VFD is new school for me, but I thought it was just a more refined and complicated PWM. Thus controlling speed and torque via changing the input voltage and frequency...

As for the 7/8" shaft, I am having my own drive wheel turned... along with the other running wheels aside from contact wheels...

The 'too good to be true' is what had me... His description says they have several of them running in whatever manufacturing faciliy he is in. Any production facility I have ever been involved with liked to run their equipment until there was no more useful life in it, and keep as many working spares on hand as they could. I'm just afraid they are trying to offload their garbage on some poor lollipop.

-Erix
 
Any used (NOS- may be used for all we know) is a crapshoot. For the price, it is cheaper than a new VFD. If the VFD works you are ahead of the game, even if the motor craps out. If they shipped to Canada, I would order one.

Warren
 
Weg makes some very affrordable vfd. I came across them on a site that was linked to in the past week or so. Probably not as many control options but could work. Did not have a pot though. I am quite happy with my Kbac 3hp vfd. I did need to alter a setting or 2 for it to turn down without shuddering when. Running my baldor 3hp motor. If I didn't have that setting I'm sure it would have been remedied.
 
LucyCustomKnives said:
Wire in a pot? Why? I thought the whole purpose of VFD was to adjust speed. Am I missing something? I'm used to pulleys and whatnot on single phase motors or simple PWM and ESC on DC motors. The VFD is new school for me, but I thought it was just a more refined and complicated PWM. Thus controlling speed and torque via changing the input voltage and frequency...

As for the 7/8" shaft, I am having my own drive wheel turned... along with the other running wheels aside from contact wheels...

The 'too good to be true' is what had me... His description says they have several of them running in whatever manufacturing faciliy he is in. Any production facility I have ever been involved with liked to run their equipment until there was no more useful life in it, and keep as many working spares on hand as they could. I'm just afraid they are trying to offload their garbage on some poor lollipop.

-Erix
Click to expand...

There's a new thing now, an evolution of lean manufacturing - 5C

Some Japanese words, basically if it's unlabelled or unused in the last few months, it's gone.
Clean shop is a clean mind, spend space on what makes money- that kind of thinking.


You can read about some experiences on manufacturing forums.
Hundred thousand dollar tooling on the shelf for a regular once a year job gets thrashed when the cleaning crew strikes because the guy that knew what it was good for was on holiday that day.


If the guy can divert it out of the scrap bin, it was free for him and there's no downside to selling it off cheaply.




I've bought several used motors from ebay and despite the shippers best efforts, they arrived usable.
 
I am by no means an expert on VFD's but I've learned a few things. In a manufacturing environment a VFD may not be something you want Joe Schmuk, the machine operator, to be able to adjust on a whim. Many can be adjusted by a technician to fine tune the parameters but then they are locked closed and run the same way all day, every day. Some may have terminals to wire in a speed control, others may not. You would want to know exactly what model that VFD is and its' options, before jumping in.

Bob
 
Ask the seller for a link to the manual


What voltage is it?


Industrial stuff can be 440 / 550 v

Unusable for us.
 
I just want to add that Justin, TX is just down the road from me. There is not much there anymore. The boot company offshore'd their manufacturing long ago. Looking at the sellers other items and his previously sold items, I would assume he is lying about any knowledge of the motors previous life or current condition. He is a junk seller and nothing more. I wouldn't risk my money.

Bob
 
I have already sent him a message asking for specifics and voltage if he has that info. I will probably pick it up if it is in a useable format. I was feeling if either one, the motor or the VFD are shot, its still worth the $$. Of course if both are shot, guess I'll be SOL.

Count, that sounds too much like Feng Shui and the like. I have been away from any type of manufacturing work for over a decade now... Working for Uncle Sam means we buy way too much of stuff we don't need and spend too much for it completely cluttering our offices and storage rooms in the process. And in return never seem to buy or have on hand the things we use a lot of. :)
Your tax dollars at work my friends!

Thanks for the info gentlemen. As said, provided it is in a useful format, and one of you stooges don't swipe it from under me ;) I will pick it up and see how it rides...

-Eric
 
shows as 3x 380V or 480V
you have that power at your shop? then I would say, hell of a deal.
if not, keep walking..
 
edgemaster said:
shows as 3x 380V or 480V
you have that power at your shop? then I would say, hell of a deal.
if not, keep walking..
Click to expand...

Thanks. I just found their product catalog and was able to look that up too. Dang...

I have 110/220 (or 120/240 as its supposed to be rated at mains). I don't have 480 in the shop, but what would be the issue of running a 240/480 transformer? A transformer can be had for just under $100. If that would work its still a deal IMO. But it is starting to get close to what I could get up and running now on 220.

Thanks.
-Eric
 
How many amps is the transformer rated for?

By the way, unless I misread the label for the motor, it's a 3 phase. It says "3 x 380V/480V".
 
Greg, the motor would have to be 3 phase to work with a VFD. The main issue is VFD input voltage and phase...
 
It is an inverter vfd but unlike the ones we typically use, that accept 120/240v single phase input and convert to 3 phase 220, this one appears to take 380v 3ph or 480v , and step down.


I have seen some integrated VFD motors that take 120/240 input, but I think the largest I've seen is 1hp.
 
I was holding out hope as there was a slight appearance difference between the motor listed and the VLT listed on Danfoss' page.

But I heard back, 3x380, 440, etc as listed in Danfoss catalog. Sorry to waste everyone's time. For some reason I wasn't seeing it when I googled before. Suckage. Back to scrounging. Smokin deal for someone with 440 though.

-Eric
 
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