KMG pics and video!!

silver_pilate

silver_pilate

Joined
Oct 30, 2002
Messages
3,974
It's finally all painted, set up, controller is wired, and it's running!

I painted it in a dark grey hammered finish rustoleum. I've also completed the slot in the work rest so I can slip the rest on and off without having to fully remove the bolts. It did spring back together some, but I was able to pry it back out and slope the ends so that is slides easily on and off the bolts. Also, since I have 3 attachments, but currently only two tooling arms, I mounted my 10" wheel and the small wheel attachments on the same arm. Basically, the work rest slides on between the small wheel attachment and the tooling arm when using the rest on the 10" wheel. To use the small wheel attachment, I just flip (rotate) the tooling arm over to bring the small wheel in line with the belt. This works for me for now as I'm only using the small wheel attachemnts for edge finishing, finger grooves, etc. I know, I know, I'll buy another tooling arm later on.

Here's the pics:

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This is the clean box. It's got filtered air and is sealed up well with silicone. It has water tight wire glands and a screw tight flex cable for input, output, and controls.

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Here's the little control box I wired up. It has a forward/stop/reverse switch and a speed pot. I couldn't find a multiple rotation pot, so I used a 320 degree pot. Didn't really see a need for an emergency stop at this point as it won't stop any slower than with just hitting the switch.

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I had some extra space under the base plate and risers, so I made a little cubby for adjustment wrenches:

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I'm not sure if I can enbed video here, so here's a link to a youtube video I posted of it running. I've got the upper frequency limit (top speed) on the controller set to 90, and it can go as high as 200 :eek:. I'm afraid the world would be destroyed if I ran the belt that fast! At 60% of the pot, it's running about as fast as my grizzly, and it can run as slow as just above a crawl.

http://www.youtube.com/watch?v=U8oZgEDszpc

Thanks for looking!

--nathan
 
Suh-weet. Dang, you sure got that wrapped up in a hurry. OK I'll trade ya for a Coote's with stepped pulleys....Just kiddin' brother. Well Done!!:thumbup::thumbup:
 
what size motor is that and what is your app. speed ranges, I think i am going to make a replica.
 
Rudy, the motor is a TEFC, 3 phase, 3400 rpm, 2 hp motor from Grizzly. The motor rpm is adjustable from the VFD (Teco FM50), and right now I estimate the belt speed at around 4000 max with the settings I'm using. With the motor at max rpm, it should hit belt speeds of ~5400 feet per minute.

--nathan
 
Great color!

(I painted mine the same and it still looks new after about 4 years).

You'll be glad you painted it right away.

I need to build me one of those tool holder trees, those would it the additional arms much handier.

Looks good.:thumbup: I know you're a happy camper.

Kelly
 
You just have to love the sound of it singing the first time you fire it up! I know I loved the sound the first time I fired mine up. Congrats!
 
Pad,

I'll post up some pics later today. I'll have to get out to the shop after work. Look for 'em later on tonight.

It really does sound like a jet engine! And it's only running at about 1/2 speed of what the VFD can push to.

--nathan
 
Everything looks great and it sounds terrific!

One thought... a nice feature of the VFDs is thier ability to over speed the motor like you've mentioned. ....but...for a belt grinder, this may not be the ideal situation. The motor makes it's peak torque and power at it's name plate speed (60hz). For speeds up to 60 hz, the VFD outputs in a "constant torque" mode.....above 60 hz it goes into a "constant power" mode. This means that as the rpms increase, the torque drops off. An actual speed/torque graph shows that the the torque really drops quickly and non-linearly as the speeds rise above the base speed. For the belt grinder, you'll get lot's of belt speed...but not much torque to keep it moving. The system inefficiencies really compound. So, if you like high belt speeds, I recommend considering to change the pulley ratio from the motor to the grinder so that the motor is running near it's name plate speed when the abrasive belt is at it's top speed. This is very common for the "industrial customers" who want lots of speed. But knifemakers, on the otherhand, want lots of control.

Top speed implies the heaviest and most reckless grinding...when you just want to remove material as fast as you can with the coarsest grits...this demands the most HP. Turning the speed down, implies more control, less material removal, and more delicate work in general....which also requires less power.



I'm not sure if I've explained myself very well...it's just stuff to think about.

-Rob
 
Rob, good information there. I've got the VFD max frequency set to 90Hz right now. There's no way I'd go above that speed as it is just too fast. I'll probably go ahead and match the max VFD frequency to the motor for max HP as you suggest. I find myself loving to turn the speed down on this thing for a measure of control I've never had. Thanks for a great product.

Pad, I'll post up some pictures later on tonight with labels and such to help anyone else who's in the process of wiring up a VFD and controls.

--nathan
 
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