I wanna watch.......... from across the street!
Jk! You could rig it up with a volt or two.......
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2x72 sander
- Thread starter ShawnR
- Start date
I wanna watch.......... from across the street!
Jk! You could rig it up with a volt or two.......
I think I am not understanding you. Why do you mention the input? And what does divided output mean?
Chris Cramer
Super User
When you said the VFD wouldn't ne very happy about it, I'm saying that the VFD input would still be wired correctly to single phase power. Then the 3 phase output could be divided to power a single phase motor.
Doggggboy
Ultra Member
Apparently there are single phase output VFDs.
www.wolfautomation.com
VFD’S for Single Phase Motors?
www.wolfautomation.com
i believe the question is that because the 3 phase is artificially generated in a single to 3 phase vfd that the output stage may not be happy only using 2 of the 3 output phases
single to single vfd i would imagine has some different electronics internally
Chris Cramer
Super User
Yeah, that is why it isn't recommended to use it that way like I said the first time. The single to single phase VFD is different than the single to 3 phase VFD.
Sorry for confusing your information. I got it now.
It still seems like a bad thing to do, but I get the idea now. As @Dabbler says, I'd be interested in doing some simple tests. Not doing that with the VFD's I have though. Someday I'll get a cheapo VFD and try it. @Dabbler can hit the go switch.
Yes, a single phase to single phase VFD is the way to go. But I'd still rather use a 3phase motor.
Former Member
Guest
All I can add to this my motor shop (that I've know for over 30 years), when I suggested the topic answer was DON'T! With a strange look. Short answers like that mean something.
I'm a little late to the party here, as usual.
If anyone is interested in a bolt together grinder with side tilt check out Saber opensource grinder project.
Guy (Canadian I believe) named Dan Comeau who is a knife maker posted plans. looks really nice.
Was very good of him to put the time into it to post online.
I'm thinking of building that one or a KMG clone as we have one at work to copy.
The KMG is simpler to build just some flat bar and a bunch of holes to drill, the one we have at work I use for just general shop stuff I actually quite like it. I think a belt grinder of any kind is an extremely useful tool for any home shop.
Art
If anyone is interested in a bolt together grinder with side tilt check out Saber opensource grinder project.
Guy (Canadian I believe) named Dan Comeau who is a knife maker posted plans. looks really nice.
Was very good of him to put the time into it to post online.
I'm thinking of building that one or a KMG clone as we have one at work to copy.
The KMG is simpler to build just some flat bar and a bunch of holes to drill, the one we have at work I use for just general shop stuff I actually quite like it. I think a belt grinder of any kind is an extremely useful tool for any home shop.
Art
Link to cut files if you have access or a buddy with a water jet or laser table. I tried with a plasma table at work but the kerf from the plasma torch eats up too much. If someone way smarter than me knew how to modify the cut file you could cut it and drill the holes.
Art
Art
I think this is the home page
Art
Art
Chris Cramer
Super User
I'm not sure if I've already shared this, but I've definitely improved my belt grinder both in terms of electrical and mechanical operation. Instead of using multiple square tubes to build the frame, a single large rectangular tube was used to keep everything in line, and the adjustable tensioner was still used. The size of the frame allows me to change the accessory used for contact like the plate and the contact wheel.
In terms of electrical operation the VFD was replaced with a 60hz 3 phase VFD to gain full control of the 3 phase motor up to it's top speed at 60hz instead of 50 hz. This VFD also has more settings t control acceleration, and deceleration; but I'll have to do more research to make use of the other functions.
Doggggboy
Ultra Member
Nice . I was thinking of changing the drive pulley on mine from 5 to 6 inches to gain more fps on the belt speed. I made the mistake of getting a 1725 rpm three phase motor instead of 3500. Then I realized I can run the motor at 90 hz with the vfd. Problem solved. But then again, I'm not making knives and spending hours in front of the grinder.
Because of this thread, I popped back in here and realized I did not submit the final photos of my build and wanted to add a few comments.
Project review....
It has been a great addition to my shop and was a fun project. A couple of quirks worth noting. The motor may be too small for this application. Despite being the main belt drive from a treadmill, it does bog kind of easily. Or that could just be the controller. My platen is a chunk of Melamine and it may be causing some of the friction causing the motor to bog a bit. When I made it, it was sized to be easily replaced by a ceramic platen common with these machines, but, of course, that round tuit has not arrived yet. Although not really a dust collector, the spark guard is a necessity! I found that out quickly. My tracking wheel, although works well, could be improved. It is a screw with counter spring. The spring is weaker than needed I think but little movements cause the belt to track very well. Belt changes are a breeze with the pressure cylinder as the tension device.
Thanks everyone who gave me input back when I was building this.
Project review....
It has been a great addition to my shop and was a fun project. A couple of quirks worth noting. The motor may be too small for this application. Despite being the main belt drive from a treadmill, it does bog kind of easily. Or that could just be the controller. My platen is a chunk of Melamine and it may be causing some of the friction causing the motor to bog a bit. When I made it, it was sized to be easily replaced by a ceramic platen common with these machines, but, of course, that round tuit has not arrived yet. Although not really a dust collector, the spark guard is a necessity! I found that out quickly. My tracking wheel, although works well, could be improved. It is a screw with counter spring. The spring is weaker than needed I think but little movements cause the belt to track very well. Belt changes are a breeze with the pressure cylinder as the tension device.
Thanks everyone who gave me input back when I was building this.
Attachments
skippyelwell
Ultra Member
Do you mean the belt protectors? Are there sparks that make it all the way around to shoot into the face?
Yep! First runs were interesting! lol
A few years ago, I found Phil Vandelay on the tube. I thought he did a great job of a dust shield. It is probably in a thread mentioned in the past but here it is again.