Belt sanders/grinders

C

cjordan

Joined
Jul 29, 2012
Messages
85
I have been looking all over the Internet but haven't had any luck finding what I'm looking for. Does anyone know where I can find a 2" drive wheel? I've contacted Beaumont Metel Works but they said they don't build 2" drive wheels.
This may not be the right place to ask this question so I apologize in advance if it's not.
 
You might be able to modify a 2" diameter idler wheel to work. What machine are you going to use it on?
 
I jist ordered a Kalamazoo for sharpening, and small grinding projects. I have been thinking about building a slow speed sander for sharpening to help keep the heat down. It was just a thought I had.
 
I know I can build one using a 4" wheel, then speed it up or slow it down with pulleys. But.... if my math is right, with a 1725 RPM motor and a 2" drive wheel I should be around 900 fpm with the belt. This would be the wheel straight off of tr motor. I thought about buying a cheep 4" then having someone turn it down for me, the problem with that is all the 4" wheels I've found are designed to where you can't turn them down without loosing "length" of the wheel. I'm gonna keep looking. I will either build one out of wood, or try to have a machine shop build me one from scratch
 
pjwoolw said:
It might be easier to use a variable speed motor.
Click to expand...

I'm trying to keep it at 120V. I have been looking at motors the last few days and the only way to get a variable speed motor is to go 3 phase vfd, as far as I'm aware of.
I could try to find a universal motor and put a rheostat in line but I'm afraid I'll end up burning the motor up.
 
cjordan said:
I'm trying to keep it at 120V. I have been looking at motors the last few days and the only way to get a variable speed motor is to go 3 phase vfd, as far as I'm aware of.
I could try to find a universal motor and put a rheostat in line but I'm afraid I'll end up burning the motor up.
Click to expand...

Almost right. At least on the metric, 220v 50Hz world of spain... you could get a 1ph in / 3ph out VDF... which should allow you to plug it into a regular household outlet and power a 3ph motor providing the capability to vary the speed of such motor.

Were you talking about 3ph/3ph VDF's only, right?
 
the smallest drive wheel i have found is 3". I use that coupled to a direct drive 1hp 3ph 800rpm Leeson motor. coupled to a 120vac in, 3ph 240ac out Leeson inverter/VFD it is easy to run at 300-400fpm.
scott
 
Mikel_24 said:
Almost right. At least on the metric, 220v 50Hz world of spain... you could get a 1ph in / 3ph out VDF... which should allow you to plug it into a regular household outlet and power a 3ph motor providing the capability to vary the speed of such motor.

Were you talking about 3ph/3ph VDF's only, right?
Click to expand...

Yes sir I was talking about 3ph/3ph. I wasn't aware of being able to run 3ph off of 120. I will start doing some research on what all to gather up. I appreciate that guys.
 
cjordan said:
Yes sir I was talking about 3ph/3ph. I wasn't aware of being able to run 3ph off of 120. I will start doing some research on what all to gather up. I appreciate that guys.
Click to expand...

I don't think we could post direct eBay links here but just search for "VFD 1HP 120V 1Ph Input Phase Converter - 4A - 230V 3Ph Out WEG w/ Speed Knob" and you will get a fair example of what I am talking about. I am pretty sure you can get them much cheaper. But now that you know that they DO exist, you will need to see which 3ph motor are you going to run, since its size (amp draw) will dictate the size of the VDF you need to get. Pretty much you will be getting the whole package (VDF+motor) at the same time. Size is also a concern. If you want to replace an existing 1ph motor with a 3ph motor, be aware that usuallly 3ph motors give you less power compared to an equivalent size 1ph.

Let us know if you need any further help!
 
Several years ago, there was a guy selling variable speed motors with a control panel on eBay. I know very little about this, so ended up buying one, pretty much a leap of faith, (mainly cause the price was way better than anything else I'd seen). Thing sounds like a motor from a treadmill, but it works. So, don't know if this'll help or not, but here's a picture of the setup (on a Viel) and the sticker on the motor (control box has no info about it)..

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...like I said, no idea if this'll help, just showing a setup that works. (Seller's long gone). :). It'll run from a crawl to 'faster than I need to'. :eek:
 
Man... yall alright! Lol
instead of scratching my head trying to figure this out on my own and still being limited I should have asked here first. We are starting to get a little busy here at work, so it'll probably be tonight before I can sit down and wrap my head around it.
I dang sure didn't know this stuff existed, so thank you all very much for pointing me in the right direction. I'm sure I will probably have a few more questions, but at least now I know which direction to head. Again thank you all so much for your help.
 
for variable speed you have several ways to go
stepped belts, like you find on a small drill press can give you 3 or 4 speeds
variable speed AC get a 3 phase motor and drive it from an inverter. they take single phase in, 3 phase out. with 120vac in, the biggest motor is 1 1/2 or 2hp. with 240vac in, you can go to 5hp.
variable speed DC find the size motor you want in DC, then find a DC drive rated for that Hp.
if you shop, you should be able to find an 3ph 1 Hp motor and drive for $200-$300. if you are building a belt sander from scratch, may as well build a 2x72, won't cost that much more.
scott
 
I put together a 2X48 rig, takes 220 1ph to the VFD which delivers 3ph 120 to the mtr.

DSC_0004.JPG


google Norm Coote for the grinder

the drive is a KBDA 27D & the mtr is a Leeson 2hp 1725
 
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