New to me Belt Grinder :I Hope

[oxford]

Cost wise the rewinding would not be feasible,the local place only rewinds specialty and large motors,I’m sure their shop rate would be $150+ per hour.

Im not even sure if 10hp motors are cost effective to be rewound anymore and it’s probably more like 20+.

[Tundra Twin Track]

so.. it voltage doubles via a config setting?

Not from 240. Rectified single phase 240 gives you about 380v to work with on the DC buss inside the VFD.

IF Lakeside's onto something with the voltage doubler, it's something I haven't seen-
doubling is not traditionally done on heavier loads due to ripple and power factor.
But my experience is with older, larger format VFDs.

If the motor would run on somewhat lower voltage- most do, with a minimal peak torque derate-
and the VFD would generate it, then off you go.

But honestly, a refit doesn't look ugly, either, and lets you use an inexpensive VFD easily.

Yes, there's just a little suckage there, as my belt sander's a cheap POS.

I looked up a lot of VFD’s never seen one that did the 440 volt from 1 ph.

You could take it to a rewinding shop and have it rewound to 240v 3ph. When I had my shop I did it many times

Cost wise the rewinding would not be feasible,the local place only rewinds specialty and large motors,I’m sure their shop rate would be $150+ per hour.

[Noitoen]

You could take it to a rewinding shop and have it rewound to 240v 3ph. When I had my shop I did it many times

[Tobias-B]

Does anyone build a VFD that can go 1ph to 440 volt3ph without a transformer?

Not from 240. Rectified single phase 240 gives you about 380v to work with on the DC buss inside the VFD.

IF Lakeside's onto something with the voltage doubler, it's something I haven't seen-
doubling is not traditionally done on heavier loads due to ripple and power factor.
But my experience is with older, larger format VFDs.

If the motor would run on somewhat lower voltage- most do, with a minimal peak torque derate-
and the VFD would generate it, then off you go.

But honestly, a refit doesn't look ugly, either, and lets you use an inexpensive VFD easily.

Yes, there's just a little suckage there, as my belt sander's a cheap POS.

t

[lakeside53]

RE: the 440V VFD output. The cheap VFD on my mill is a huanyang clone from ebay which will run a 440V 3ph motor from 220v single phase. You tell the VFD what the nominal output voltage is via one of the configuration settings.

Dan

so.. it voltage doubles via a config setting?

[tom_d]

Yes it’s Zimmerman PS 0,the 1ph motor already installed the Machine is in nice condition.

You found a good machine, and you're quick to be making good use of it. Nice! (yeah.....color me jealous)

[Tundra Twin Track]

If I read that data plate correct it's a 3 phase 1.1kw motor, which is a bit under 1.5hp, it's 440 volt and draws 2.5 Amps. Motor spins at 3400 rpm @ 60 cycles input. Should be easy to swap in a little single phase motor to get the job done without much hassle. And that's a really nice machine, too, (Zimmermann PS-0?) so I'll throw in the obligatory "you suck" while I have the opportunity 😀.

Yes it’s Zimmerman PS 0,the 1ph motor already installed the Machine is in nice condition.

[tom_d]

Sorry my mistake, it’s a single speed motor.Does anyone build a VFD that can go 1ph to 440 volt3ph without a transformer?


Yes it appears very well built,be nice to leave Original motor but I will wait and see what VFD options are.



Yes the one one wheel has abrasive side on it,talked to Nexus Belt Grinder Guy and he has one configuration that does that with no issues.Machine is 1983 and all coating on Wheels has separated from Aluminum Wheel,will be dropping wheels off tomorrow to be recoated.The durometer will be a guessing game possible 70,I’m open to ideas on that.

If I read that data plate correct it's a 3 phase 1.1kw motor, which is a bit under 1.5hp, it's 440 volt and draws 2.5 Amps. Motor spins at 3400 rpm @ 60 cycles input. Should be easy to swap in a little single phase motor to get the job done without much hassle. And that's a really nice machine, too, (Zimmermann PS-0?) so I'll throw in the obligatory "you suck" while I have the opportunity 😀.

[Tundra Twin Track]

RE: the 440V VFD output. The cheap VFD on my mill is a huanyang clone from ebay which will run a 440V 3ph motor from 220v single phase. You tell the VFD what the nominal output voltage is via one of the configuration settings.

Dan

Thanks Dan,that’s good to know the 1-1/2 hp 1ph is already installed and will try it with that for now.Did you bypass all your switch’s and control directly from VFD.Could you post a link or pic of the model you have.

One of the advantages of variable speed drives is that the faster the abrasive moves-------------- the Finer the finish.
When grinding Slitter knives (Carbide) at work , we just increased the grinder spindle speed to go from roughing to finish the grind...same with a sander !

Rich

Thanks Rich no experience with Belt Grinders,just a 24” Disc Grinder that works very good.The 3ph motor can be reinstalled easily,so appreciate insight on higher speeds.I have read using smaller rollers speed should be a little slower,the rollers on top of Platen are less than 7/8” in dia.

[Rich Carlstedt]

.................................................. ........I’ve heard great things about Cubetron ,VSM Abrasives just released a new belt this past April called Actirox, it suppose to be a step up from there Ceramic Plus that’s Cubetron equivalent.The Actirox only available in 36 grit,more selection is on the way.

One of the advantages of variable speed drives is that the faster the abrasive moves-------------- the Finer the finish.
When grinding Slitter knives (Carbide) at work , we just increased the grinder spindle speed to go from roughing to finish the grind...same with a sander !

Rich

[danlb]

RE: the 440V VFD output. The cheap VFD on my mill is a huanyang clone from ebay which will run a 440V 3ph motor from 220v single phase. You tell the VFD what the nominal output voltage is via one of the configuration settings.

Dan

[Tundra Twin Track]

Will be running a 1ph Motor for the time being,it’s a US built Marathon 1-1/2hp that I found at the Dump,runs glass smooth.A few more kinks to figure out for pulley mount then waiting game for Wheels to be recoated and order some Abrasive Belts.Drilled some holes in Cast Body,was surprised it was 5/8” thick🙂

[true temper]

T T can’t you over speed the motor with your VFD,some of the Guys selling Belt Grinders won’t warranty the New Bearing in those small rollers when used at high speed.This is a little different Animal as the rollers on top of Platen are less than 7/8” in dia,maybe the high speed program might be a bearing killer so to speak for this machine.

I’m not smart enough to program the VFD to run faster, I got it to run at 60 hertz figured that was good enough.
I didn’t know any better and used double or triple sealed ag bearings on my adjuster idler. It ran hot for many years but it’s getting better now.

[Tundra Twin Track]

440 V at 60Hz is not an European used voltage so that machine must have been made for the US market. Maximum speed for an induction motor in Europe is 2980 RPM

Good observation Noitoen,that makes perfect sense.Like the Wadkin table on my Gang Drill,every bolt on entire machine is BSW but all holes on table are 1/2” NC where jigs would be attached to,just for North American Market.

That's a neat tool. I wonder for general purpose use, does the tight radius at the top accelerate belt wear, especially at the splice?

I've seen a version similar to this at auctions in the US, mostly in die shops. It is smaller and lighter duty, but intended to be more precise, with indicators to set angles, etc. I can't recall the name.

I’m sure the small rollers don’t improve belt life for sure,the New Material for Belts these days would be better than the ones when these machines first came on the market in the late 60’s.

Any chance the machine you seen was a Philipson,it’s the only other one I’m aware of that is similar design,made in England and very pricey.This is not a Beast of a Machine like my Max 24” Disc Grinder,but will have capabilities that are totally different.Time will tell🙂

[Glug]

That's a neat tool. I wonder for general purpose use, does the tight radius at the top accelerate belt wear, especially at the splice?

I've seen a version similar to this at auctions in the US, mostly in die shops. It is smaller and lighter duty, but intended to be more precise, with indicators to set angles, etc. I can't recall the name.