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Temporary 2 x 72?

Discussion in 'Grinders' started by Icho-, Apr 8, 2013.

  1. Icho-

    Icho- Staff Member

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    Well I wasn't going to post anything about this grinder untill I was sure if it was going to work but I decided to just incase someone was considering trying to make a belt grinder out of a treadmill. Hopefully this may help you decide if it is worth it or not. I know it has been done many times and there are youtube videos to prove it. I figured I would try it cause if it does end up working it will be a very inexpensive way to spin a 2 x 72 belt. So far i have:

    $30 for working treadmill (Kijiji) sometimes you can find them for free
    $45 for 4 skateboard wheels and set of bearings. Bearings were cheap ones incase it doesn't work.
    $5 Screws, nuts and washers. I could have found them here but you will see in the pic below why it was easier to buy them.
    $20 Couple pieces of square tubing and angle iron.

    Last night I gave up on it because the way I had the belt set up it would not spin fast enough to make a spark. I ended up using the pulley/Balancer? on the motor itself because it was a bigger diameter. I got it spinning a bit past half speed and I was able to actually remove some material off of a knife blank I saw cut using the skateboard wheel as a contact wheel. Here is what I got so far.

    [​IMG]

    The grinder is actually spinning fast enough in this pic to make sparks. As you can see there are more C-clamps holding it together than weld or screws. That's why I didn't want to go much faster. I am feeling pretty good about it so I will start welding it together making sure that I have everything as square, straight and parallel as possible. Tracking is a bit of a problem right now cause it is not square.

    I still want to build the grinder I have been designing but I just don't have the time and extra cash to do it right. If this works out I will be able to take my time with my design and get the proper motor, VFD and wheels. Who knows, I may even be able to keep it as a lighter duty back up grinder. I'll keep you posted on how it works out and feel free to comment or ask questions.
     
  2. shadman

    shadman Member

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    i'm impressed-how fast does the treadmill actually turn?
     
  3. Icho-

    Icho- Staff Member

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    Thanks. Going by the numbers the motor is rated at 4700rpm and the drive wheel is 5.75 dia so it should do about 7000 sfm max.
     
    Last edited: Apr 9, 2013
  4. Grayzer86

    Grayzer86 Active Member

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    Wow, thats some serious speed at top end. Should really move some metal at that SFPM
     
  5. Icho-

    Icho- Staff Member

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    Ya I don't know if I will ever want to reach it. I guess I will have to see how it runs once it is welded and properly set up.
     
  6. metal99

    metal99 Member

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    Cool man! I like it :) I'm actually looking for some decent skateboard wheels lol.

    I'm really tempted to go with a treadmill motor for my grinder but I wonder how it will like the grinding dust.
     
    Last edited: Apr 9, 2013
  7. Icho-

    Icho- Staff Member

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    Thanks Jules. The wheels seem to be ok so far. I may have to get better bearings. These were only $10 for the set. To keep the dust out I was going to cover it with the original cover and cut some holes and put some kind of filter stuff over the holes. One other thing about the motor. I heard treadmill motors are over rated. Mine is 2.25 hp but it doesn't feel like 2.25hp. I hope to get it welded up in the next couple (work is interfering with my hobbies lol) days and see how much power it really has.
     
  8. metal99

    metal99 Member

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    I hope it works out great for ya! The skateboard wheels should last a long time. As far as the bearings go I bet the cheap ones will even last quite a while.
     
  9. Rob W

    Rob W Active Member

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    Nice Icho ! Look fwd to some more pics
     
  10. stevebates

    stevebates Member

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    Looks sweet!!!
     
  11. Icho-

    Icho- Staff Member

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    Thanks guys. Right now it is in many pieces. Last night I started cutting, fitting and welding the frame together. The way it was in the pic ihad to cut the frame to get the belt around the motor. I think I got that sorted out now but belt changes won't be as convenitnt as one of those fancy grinders but still shouldn't be too bad. I'll take more pics when I get the frame together properly.
     
  12. Grayzer86

    Grayzer86 Active Member

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    I may be missing something, but what does the large shaft with the belt drive even do? I assume thats what is making the belt changes a pain. I cant see the machine in person but it looks like if that part was removed, belt changes would be a snap. Does the grinding belt run straight off the pulley on the motor?
     
  13. Icho-

    Icho- Staff Member

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    That shaft is what I actually tried as to use as the drive wheel but it spun the belt way to slow. The frame itself is the main pain for the belt changing. Unfortunately I have to keep that shaft because there is a plastic wheel on th that spins inside of a sensor. Without it the grinder stops after a few seconds. Unless I can bypass the sensor somehow I have to keep the shaft. I even thought about shortening it but its probably not worth the time.
     
  14. Icho-

    Icho- Staff Member

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    I was out in the garage for a bit working on the grinder and I'm glad I ordered belts today. It is not done yet but it is much closer. I have the frame and wheels square and straight to each other and it is tracking so much better now. I can actually track the belt to the left and right smoothly. For the most part the frame is in two pieces and just has to be welded together. Just a few nuts and holes that I have to take care of before I can finish welding. On the test run I had it screaming. Its pretty quiet for the speed it was going at and was smooth. I figure i had it at 3/4 speed and i think it is probably faster then I would normally run it at. I'm hoping I can finish it up tomorrow night and then I can post some pics.
     
  15. Grayzer86

    Grayzer86 Active Member

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    Looking forward to seeing it once its up and running.
     
  16. Icho-

    Icho- Staff Member

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    Me too! I have to get it done and hopefully 5 blades out for ht Monday so I will be testing it as soon as it is together and safe to really use. I hope my 1 and only belt is nough to get the job done.
     
    Last edited: Apr 11, 2013
  17. metal99

    metal99 Member

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    Awesome man :) did you crown the tracking wheel?
     
  18. Icho-

    Icho- Staff Member

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    Thanks Jules. I just put some tape on the center of it. I may still crown it by hand though but if the tape holds up and works I may just leave it.
     
  19. metal99

    metal99 Member

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    Hmm... Now I'm wondering if I should save my money and not buy the tracking wheel. That would save me about $70.
     
  20. Icho-

    Icho- Staff Member

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    If you plan on using skateboard wheels I could only find them in sets of 4 so you will have extra wheels to try as a tracking wheel. You can find them on ebay for less than I paid for mine. I think I seen a set of 4with bearings for $25. They are actually long board wheels.
     

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