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  1. #131
    Member Andrew Leigh's Avatar
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by Erebus View Post
    Don't bother with the 24, go 36 and either 60 or 80 and then something in the 120 to 150 range to take out the deep scratches.

    Even the 120 belts I have take off a crazy amount of steel but I'm running probably 2800 surface feet per minute (13m/s).
    This is important to me. The guys in the states are looking at over 800 - 5000fps. I can simplify my machine significantly if 2800fps works for everything.
    One too many wasted sunsets and one too many for the road .........

  2. #132
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by Andrew Leigh View Post
    This is important to me. The guys in the states are looking at over 800 - 5000fps. I can simplify my machine significantly if 2800fps works for everything.
    2800 is plenty fast, I can understand the slower speeds especially for finishing and fine work but anything over 2800 is for serious metal stripping.

    Sent from my SM-G900F

  3. #133
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    Default Re: 72" x2" Knife blade Belt sander machine build

    I will only be able to determine the speed of my machine if I get hold of a motor..

  4. #134
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    Default Re: 72" x2" Knife blade Belt sander machine build

    My Herbst machine runs from about 30rpm to 2800rpm. That really is plenty fast.. I can imagine you would run into all kinds of tracking, balancing and bearing overheating problems at faster speeds. On a 20mm mini wheel oom Gawie said not to take it past 1000rpm.
    I prefer using 60grit on steel, as opposed to 36. The steel wears the belt out pretty quick. 36 is great for avoiding overheating wood and plastics though.

  5. #135
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by Erebus View Post
    2800 is plenty fast, I can understand the slower speeds especially for finishing and fine work but anything over 2800 is for serious metal stripping.

    Sent from my SM-G900F
    2800fps is seriously fast like 3000km/h

    2800fpm is more acceptable at 51km/h or 14m/s

    The idea behind the slower speed is part material removal and heat control, but when starting to use small diameter contact wheels it becomes really important. If you have 2800fpm running over a 20mm dia contact wheel it will be spinning plenty fast. 13000rpm. from here your bearings need to be relatively good at 5000fpm its at 24000rpm this is smoking.

  6. #136
    Member Andrew Leigh's Avatar
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by Andrew Leigh View Post
    This is important to me. The guys in the states are looking at over 800 - 5000fps. I can simplify my machine significantly if 2800fps works for everything.
    My bad should have read fpm ..
    One too many wasted sunsets and one too many for the road .........

  7. #137
    Member Andrew Leigh's Avatar
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by krobar View Post
    My Herbst machine runs from about 30rpm to 2800rpm. That really is plenty fast.. I can imagine you would run into all kinds of tracking, balancing and bearing overheating problems at faster speeds. On a 20mm mini wheel oom Gawie said not to take it past 1000rpm.
    I prefer using 60grit on steel, as opposed to 36. The steel wears the belt out pretty quick. 36 is great for avoiding overheating wood and plastics though.
    If your drive wheel is 150mm diameter then at 2800rpm you have a max surface speed of 4 300fpm with the 200mm wheel 5 700fps. Why do the commercial makers make them so fast?
    One too many wasted sunsets and one too many for the road .........

  8. #138
    Member Andrew Leigh's Avatar
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by Erebus View Post
    2800 is plenty fast, I can understand the slower speeds especially for finishing and fine work but anything over 2800 is for serious metal stripping.
    We are talking surface speed of the belt here as measured in fps and not output rpm of the motor?
    One too many wasted sunsets and one too many for the road .........

  9. #139
    Member Andrew Leigh's Avatar
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by The Beast View Post
    2800fps is seriously fast like 3000km/h
    I meant fpm

    2800fpm is more acceptable at 51km/h or 14m/s

    The idea behind the slower speed is part material removal and heat control, but when starting to use small diameter contact wheels it becomes really important. If you have 2800fpm running over a 20mm dia contact wheel it will be spinning plenty fast. 13000rpm. from here your bearings need to be relatively good at 5000fpm its at 24000rpm this is smoking.
    This would be great as I can then dispense with the jackshaft and pulleys to get my motor from 1400 to 2800rpm.


    A VSD running at 75Hz would have my 1420 rpm motor up to about 2 200rpm which given my drive wheel will give a maximum belt speed of 3 100fpm. I am not a commercial manufacturer and don't mind if it does not strip steel as fast as the commercial machines.
    One too many wasted sunsets and one too many for the road .........

  10. #140
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    Default Re: 72" x2" Knife blade Belt sander machine build

    Quote Originally Posted by Andrew Leigh View Post
    We are talking surface speed of the belt here as measured in fps and not output rpm of the motor?
    Correct, my motor is 2760 rpm so had to use a 100mm wheel as the commercial wheels would have run too fast.

    Sent from my SM-G900F

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