Page 2 of 2 FirstFirst 12
Results 26 to 41 of 41

Thread: Belt Grinder Build

  1. #26
    Join Date
    Oct 2018
    Posts
    14
    Post Thanks / Like

    Re: Belt Grinder Build

    I went with this one.

    https://dealerselectric.com/FM50-202-N4.asp

    Goes on sale from time to time I believe. I got it for $150.

    Its older but its fully enclosed.

    Haven't wired it up yet.

  2. Likes dmcnally liked this post
  3. #27
    Join Date
    May 2016
    Location
    Southern California
    Posts
    150
    Post Thanks / Like

    Re: Belt Grinder Build

    Router Speed Control from harbor freight works well for single phase vfd. Used to be available in 220V as well. Their website compared it to something from Rockler. I cannot remember the horsepower rating on mine.
    Miller Multimatic 220AC
    Miller Thunderbolt 225
    Victor OA

  4. #28
    Join Date
    Nov 2009
    Location
    Pensacola , Fla
    Posts
    1,085
    Post Thanks / Like

    Re: Belt Grinder Build

    I change my motor out to use a single phase input 120 VAC to 3 phase 220 VAC output, this allows for full speed control. the VFD in the image will allow up to 90 hz to the motor for 1.5 times normal speed, some of the more expensive ones will to 120 Hz or 2 times normal speed. You cannot use a speed control on a capacitor start motor, because they have a speed switch the drops the capacitor after it reaches the set speed. Running slower will cause something to smoke, either the motor of speed controller.
    Attached Images Attached Images    
    Last edited by acourtjester; 05-18-2020 at 10:25 AM.
    DIY CNC Plasma table USB BOB Price THC
    Hypertherm 65
    Everlast PowerTig 255 EXT
    Miler 180 Mig
    13" metal lathe
    Mill/ Drill
    ECT, ECT,

  5. #29
    Join Date
    Jun 2016
    Location
    Central Coast, California
    Posts
    170
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by _Dom View Post
    Router Speed Control from harbor freight works well for single phase vfd. Used to be available in 220V as well. Their website compared it to something from Rockler. I cannot remember the horsepower rating on mine.
    I'll disagree with that. I have one and occasionally use it to cut aluminum on my miter saw. It loses power really fast as you turn down the frequency. But, for $15, after the 20% off coupon, it's worth playing with.

    I have an ABB 220v 2.2kw , single to 3 phase, VFD on my lathe and that works like a charm.

    Dave

  6. #30
    Join Date
    May 2012
    Location
    Ontario, Canada
    Posts
    1,322
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by _Dom View Post
    Router Speed Control from harbor freight works well for single phase vfd. Used to be available in 220V as well. Their website compared it to something from Rockler. I cannot remember the horsepower rating on mine.
    No

    A router speed controller is for universal type motors with brushes, like routers and other portable electric tools.
    Low HP motors

    That motor he will use is 2hp three phase induction motor

    Not the same thing and not interchangeable or compatible.
    Last edited by 12345678910; 05-18-2020 at 10:50 AM.

  7. #31
    Join Date
    May 2016
    Location
    Southern California
    Posts
    150
    Post Thanks / Like

    Re: Belt Grinder Build

    Thanks for setting me straight. I didn't think about the capacitor start. Never used one anywhere close to rated capacity of 15A.
    Miller Multimatic 220AC
    Miller Thunderbolt 225
    Victor OA

  8. #32
    Join Date
    Feb 2016
    Location
    Myrtle Beach
    Posts
    494
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by acourtjester View Post
    I change my motor out to use a single phase input 120 VAC to 3 phase 220 VAC output, this allows for full speed control. the VFD in the image will allow up to 90 hz to the motor for 1.5 times normal speed, some of the more expensive ones will to 120 Hz or 2 times normal speed. You cannot use a speed control on a capacitor start motor, because they have a speed switch the drops the capacitor after it reaches the set speed. Running slower will cause something to smoke, either the motor of speed controller.


    Yeah, thanks for the info on capacitors as well I knew there was a reason they couldn't be used on some motors but couldn't remember why.
    Lincoln 350MP
    Millermatic 350P
    Syncrowave 250
    1969 SA200
    HTP Invertig 221

  9. #33
    Join Date
    Apr 2006
    Location
    Outside of Raleigh, NC
    Posts
    1,045
    Post Thanks / Like

    Re: Belt Grinder Build

    Capt, that is a very well crafted build! It could easily be mistaken for a factory built product. Thanks for sharing.

    Scott
    Miller Trailblazer Pro 350D
    Miller Suitcase MIG
    Miller Spectrum 2050
    Miller Syncrowave 250DX
    Lincoln 210MP

  10. #34
    Join Date
    Dec 2014
    Location
    Northern California
    Posts
    208
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by acourtjester View Post
    I change my motor out to use a single phase input 120 VAC to 3 phase 220 VAC output, this allows for full speed control. the VFD in the image will allow up to 90 hz to the motor for 1.5 times normal speed, some of the more expensive ones will to 120 Hz or 2 times normal speed. You cannot use a speed control on a capacitor start motor, because they have a speed switch the drops the capacitor after it reaches the set speed. Running slower will cause something to smoke, either the motor of speed controller.
    Since you know way more than me about this...question.

    This is the motor I have...can it be run with a VFD device of some sort? I currently have it wired to run 220/240
    Name:  5628E524-8698-4D09-9492-462939430473.jpg
Views: 115
Size:  70.7 KB

    Thanks for any input...

  11. #35
    Join Date
    Oct 2018
    Posts
    14
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by Tarmstrong View Post
    Since you know way more than me about this...question.

    This is the motor I have...can it be run with a VFD device of some sort? I currently have it wired to run 220/240
    Name:  5628E524-8698-4D09-9492-462939430473.jpg
Views: 115
Size:  70.7 KB

    Thanks for any input...
    Single phase output VFDs do exist but I believe a start cap is a no go with them.

    I am definitely not an expert but I've always figured it's not worth the effort especially with an abundance of 3 phase motors available.

    Just make sure you get one that is TEFC with the same frame you have now.

    Sent from my Nexus 6P using Tapatalk

  12. #36
    Join Date
    Nov 2009
    Location
    Pensacola , Fla
    Posts
    1,085
    Post Thanks / Like

    Re: Belt Grinder Build

    no sir that is a Capacitor start motor, the 2 humpy things are capacitors. These give a phase shift to single phase motor to help start, (this gives them higher starting torque) when they reach almost normal speed a centrifugal switch removes them from the motor power. The motor continues to run a normal speed at that point. What a VFD does if change the power frequency to change the speed, the motor still gets full voltage, there for still has the power to rotate. This is done with the electronics in the VFD, even with the 60 HZ input the output can vary the Hz output. As I said the one I use can go up to 90 Hz and this is why it can rotate faster than the normal rpm of the motor.
    Attached Images Attached Images  
    DIY CNC Plasma table USB BOB Price THC
    Hypertherm 65
    Everlast PowerTig 255 EXT
    Miler 180 Mig
    13" metal lathe
    Mill/ Drill
    ECT, ECT,

  13. #37
    Join Date
    Nov 2009
    Location
    Pensacola , Fla
    Posts
    1,085
    Post Thanks / Like

    Re: Belt Grinder Build

    that is a 2 HP motor if you want to increase the belt speed you can increase the drive wheel size, but you still have a single speed belt grinder.
    DIY CNC Plasma table USB BOB Price THC
    Hypertherm 65
    Everlast PowerTig 255 EXT
    Miler 180 Mig
    13" metal lathe
    Mill/ Drill
    ECT, ECT,

  14. #38
    Join Date
    Feb 2016
    Location
    Myrtle Beach
    Posts
    494
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by scsmith42 View Post
    Capt, that is a very well crafted build! It could easily be mistaken for a factory built product. Thanks for sharing.

    Scott
    Thank you!
    Lincoln 350MP
    Millermatic 350P
    Syncrowave 250
    1969 SA200
    HTP Invertig 221

  15. #39
    Join Date
    Mar 2018
    Location
    San Jose, CA Kelseyville, CA
    Posts
    1,343
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by jh1990 View Post
    Single phase output VFDs do exist but I believe a start cap is a no go with them.
    I've never heard that, I thought you needed a 3 phase motor to use a VFD. They must be expensive for single phase, I've never seen one I don't think...

    You can pick up 3 phase motors cheap on craigslist, for a belt grinder a 2HP or 3HP is good as that's the sweet spot for affordable VFDs.

    When I say affordable I mean in the $150-$300 range.

    A lot of people use the KB Electronics VFDs for belt grinders as they are enclosed so grinding dust doesn't get to the electronics. You can put a VFD in your own box though to save some $$$s, the KB Electronics VFD a bit more than a normal VFD, but convenient for a belt grinder and why so many people use them for that purpose.

    All of our mileage varies.

  16. #40
    Join Date
    Dec 2014
    Location
    Northern California
    Posts
    208
    Post Thanks / Like

    Re: Belt Grinder Build

    Thanks for all the reply’s guys...sorta what I thought about my motor.

    Anybody need a good single speed motor?

  17. #41
    Join Date
    Mar 2018
    Location
    San Jose, CA Kelseyville, CA
    Posts
    1,343
    Post Thanks / Like

    Re: Belt Grinder Build

    Quote Originally Posted by Tarmstrong View Post
    Thanks for all the reply’s guys...sorta what I thought about my motor.

    Anybody need a good single speed motor?
    Can't help you on that single phase motor, but are you in the bay area by chance?

    Here's a motor that would be good for a belt grinder, 3HP Maraton 3450RPM 3 phase for $100. (there's 3 motors, see the Marathon)

    https://sfbay.craigslist.org/pen/tls...124790782.html

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Page generated in 1,594,197,525.28811 seconds with 15 queries