Need help with a grinder. Thanks

Problem is your grinder you got does not have a vfd. What vfd was he going to send you? Like has been said that’s not a 3ph motor. He would have probably sent you a cheap $99 vfd from China. I bought a 10ho Chinese vfd and it was like $270 I think. But there is only like one brand I think that is an ok Chinese vfd. All the rest knock there vfds off and make cheaper clones. Have you looked at a compact 2x42. I know those are gaining popularity as of late.
 
JTknives said:
Problem is your grinder you got does not have a vfd. What vfd was he going to send you? Like has been said that’s not a 3ph motor. He would have probably sent you a cheap $99 vfd from China. I bought a 10ho Chinese vfd and it was like $270 I think. But there is only like one brand I think that is an ok Chinese vfd. All the rest knock there vfds off and make cheaper clones. Have you looked at a compact 2x42. I know those are gaining popularity as of late.
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Have no clue what vfd he was going to send me, he never specified, only told me it was going to be plug and play and that he shipped it yesterday. I have no doubt it will be a cheap one though.
I have looked at some 2x42 but it would still have to be shipped from the states. I really want a proper 2x72 though. something I can eventually get a radius platen for.

This isn't a hobby for me, its my work so I want to be able to get something proper for the job. I'm sure a 2x42 would work pretty good and might be a good way to go, but eventually I'll have to go with a 2x72 anyways. When I get my refund, I'll just save up for a proper 2x72. theres a maker within driving distance, so I can go and look at it in person. Plus he makes videos demonstrating the product and I know more of what to look for. Will be making a post before I make the purchase though that way I can get more feedback from people who know a hell of a lot more then me.
 
If your not keeping the vfd or grinder then I would refuse delivery of the vfd. That’s one less thing you have to send back.
 
"IF" you have to unpack the VFD we'd LOVE to see a photo of it - this is to work on a 120vac 1 ph motor isn't it? While there are VFD's that will work on 1 ph, they're VERY expensive.
 
Ken H> said:
"IF" you have to unpack the VFD we'd LOVE to see a photo of it - this is to work on a 120vac 1 ph motor isn't it? While there are VFD's that will work on 1 ph, they're VERY expensive.
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If I get it and have to open it, will do. I was looking at them and they are expensive. I also don't know if I fully understand what I read, but they don't function the same?
 
I don’t see how there can bee a speed control for a single ph motor. The capacitors on the motor are used to start the motor and once to motor reaches X rpm a centrifugal switch opens up and disconnects the capacitors. If the motor was alowed to run with the capacitors it would pull way to many amps and burn out. So if you slow it down the switch will close and engage the capacitors.
 
i see some decently built ones on ebay for around 700. of course no vfd. but i bet they track correctly.
 
not hijacking the thread but i got a ????? i don't know to much about the electric end of grinders or anything else actually. with that said how is my single phase lathes, bandsaw, and others have variable speed. im sure its something different than the normal vfd???
 
Pulling that tracking arm down more in the rear ( towards the drive motor) naturally will decrease the angle at the door hinge used to track the belt . can you get that arm down some. The angle of the bolt holding the guide wheel is WAY off. See if you can bet that arm higher. With the adjuster bottomed out so the belt almost tracks correctly, then go from there. Listen to everything I say with a grain of salt, I don't even own a 2×72.
 
JTknives said:
I don’t see how there can bee a speed control for a single ph motor. The capacitors on the motor are used to start the motor and once to motor reaches X rpm a centrifugal switch opens up and disconnects the capacitors. If the motor was allowed to run with the capacitors it would pull way to many amps and burn out. So if you slow it down the switch will close and engage the capacitors.
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I'll have to take a photo but I'm about 99% positive my blacksmitthing club has a bader with variable speed running off single phase. I think it's come up on here before. Certainly not the norm but I do think it can be done. I'll take a photo next time I'm out there.

crank78 said:
not hijacking the thread but i got a ????? i don't know to much about the electric end of grinders or anything else actually. with that said how is my single phase lathes, bandsaw, and others have variable speed. im sure its something different than the normal vfd???
Click to expand...

There are other methods. It also depends on what you are trying to make variable speed. A small fan for example is different from a 3hp grinder. One of the more popular methods I'm aware of are special v-pulleys. Basically they expand and contract changing where the belt rides in the pulley wheel. My shop smith and powermatic dp had variable speed done this way. To your point though, how we do it with a 3ph motor and VFD is about the most effect and cost effective way that I have seen.

As far as the OP's issue, it's unfortunate but as someone else pointed out you bought cheap and got cheap. I know you realize this now, but for all the new guys on here maybe some will avoid a costly lesson because you shared this. Hopefully you can send it back and get your money returned.

-Clint
 
JTknives said:
I don’t see how there can bee a speed control for a single ph motor. The capacitors on the motor are used to start the motor and once to motor reaches X rpm a centrifugal switch opens up and disconnects the capacitors. If the motor was alowed to run with the capacitors it would pull way to many amps and burn out. So if you slow it down the switch will close and engage the capacitors.
Click to expand...

JT, believe it or not (I didn't) there actually are speed control systems for 1 ph motors. NOT compatible with a standard capacitor start motor, but with Permanent Split Capacitor (PSC), Shade Pole Induction Motor, AC Synchronous type motors. They're not very cost effective and are very expensive. Seems like a few months back I saw some prices and they were well over $400 for less than 1 hp just for a board level speed controller.

https://www.wolfautomation.com/blog/vfds-for-single-phase-motors/
 
Augus7us said:
I'll have to take a photo but I'm about 99% positive my blacksmitthing club has a bader with variable speed running off single phase. I think it's come up on here before. Certainly not the norm but I do think it can be done. I'll take a photo next time I'm out there.



There are other methods. It also depends on what you are trying to make variable speed. A small fan for example is different from a 3hp grinder. One of the more popular methods I'm aware of are special v-pulleys. Basically they expand and contract changing where the belt rides in the pulley wheel. My shop smith and powermatic dp had variable speed done this way. To your point though, how we do it with a 3ph motor and VFD is about the most effect and cost effective way that I have seen.

As far as the OP's issue, it's unfortunate but as someone else pointed out you bought cheap and got cheap. I know you realize this now, but for all the new guys on here maybe some will avoid a costly lesson because you shared this. Hopefully you can send it back and get your money returned.

-Clint
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Yeah, I am hoping people learn from this as much as I did. Least it wasn't a complete waste
 
olymon said:
Pulling that tracking arm down more in the rear ( towards the drive motor) naturally will decrease the angle at the door hinge used to track the belt . can you get that arm down some. The angle of the bolt holding the guide wheel is WAY off. See if you can bet that arm higher. With the adjuster bottomed out so the belt almost tracks correctly, then go from there. Listen to everything I say with a grain of salt, I don't even own a 2×72.
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I'm just going to be returning it
 
Ken H> said:
JT, believe it or not (I didn't) there actually are speed control systems for 1 ph motors. NOT compatible with a standard capacitor start motor, but with Permanent Split Capacitor (PSC), Shade Pole Induction Motor, AC Synchronous type motors. They're not very cost effective and are very expensive. Seems like a few months back I saw some prices and they were well over $400 for less than 1 hp just for a board level speed controller.

https://www.wolfautomation.com/blog/vfds-for-single-phase-motors/
Click to expand...

Yeah I was think cap start motors. I use speed controllers on shade pole and brushed motors. But those usaly are not very large in the HP range. Guess I learn something new every day.
 
Shipping to Canada. I live close to the border and most US border towns have some sort of shipping/receiving companies in them that will receive your parcel and hold it until you can pick it up. Sumas which is close to me has Ship Happens and Pic it Up. Both charge $3 per package.
I just walk across the border and bring the parcel back in person. Most they make me pay is taxes that we would pay if we bought something in the store in Canada. If the item is less than about $150 they usually don't even charge me taxes. Often shipping within the states is free, and I avoid the "brokerage fees" which are huge with the couriers (not as bad with USPS), and it never gets hung up at the border waiting to be cleared by customs.
If you have a friend who lives near the border I would look into making a deal with them to pick up stuff like this for you across the line.
 
Randydb said:
Shipping to Canada. I live close to the border and most US border towns have some sort of shipping/receiving companies in them that will receive your parcel and hold it until you can pick it up. Sumas which is close to me has Ship Happens and Pic it Up. Both charge $3 per package.
I just walk across the border and bring the parcel back in person. Most they make me pay is taxes that we would pay if we bought something in the store in Canada. If the item is less than about $150 they usually don't even charge me taxes. Often shipping within the states is free, and I avoid the "brokerage fees" which are huge with the couriers (not as bad with USPS), and it never gets hung up at the border waiting to be cleared by customs.
If you have a friend who lives near the border I would look into making a deal with them to pick up stuff like this for you across the line.
Click to expand...

I have a buddy who might be able to help if I go that route, will be looking into a grinder located close to toronto next as its about an hour drive.
 
JTknives said:
I live right by the border just to let you know. Right next to the Columbia river.
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I'm right beside niagara falls. Half hour drive to lewiston. My buddy drives through here usually once a week for work. The only issue might be space in his car lol.

Also, had to look it up, your the west end, I'm east.
 
Augus7us said:
I'll have to take a photo but I'm about 99% positive my blacksmitthing club has a bader with variable speed running off single phase. I think it's come up on here before. Certainly not the norm but I do think it can be done. I'll take a photo next time I'm out there.



There are other methods. It also depends on what you are trying to make variable speed. A small fan for example is different from a 3hp grinder. One of the more popular methods I'm aware of are special v-pulleys. Basically they expand and contract changing where the belt rides in the pulley wheel. My shop smith and powermatic dp had variable speed done this way. To your point though, how we do it with a 3ph motor and VFD is about the most effect and cost effective way that I have seen.

As far as the OP's issue, it's unfortunate but as someone else pointed out you bought cheap and got cheap. I know you realize this now, but for all the new guys on here maybe some will avoid a costly lesson because you shared this. Hopefully you can send it back and get your money returned.

-Clint
Click to expand...
I have seen several baders that were DC motors with speed control. Perhaps that is what they have? of course a 3 phase motor will run off of single phase, if you use a VFD. Did the motor on the bader have capacitor bumps? if not, it's either a 3 phase, or a DC motor.
 
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