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  1. #31
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    Mar 2014
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    [QUOTE=jgforsberg;1950944]Matty I have a VFD on the one saw and am going for one on the CC mostly for the brake. I do have a 500mm blade that i run at 45 hz for thick cuts on the Delta 40C. the problem with the lower speed on the DD saws is you give up power the lower the HZ and the 5 hp is a little shy to begin with. In my research i found high speeds blades from Linbide saws
    Guidelines for using Linbide Saw Blade

    and there 500mm recommended speed is 90m/s max rpm is 4000.

    as i said my saw has a brake and i just finished a drop box
    [/QUOTE



    A 500mm saw @ 4000rpm is 104.6m/s that is 15% over the maximum recommended safe speed for cutting hardwood and still above the max for softwood.

    A 700mm saw @ 2800rpm is in the same position with a speed of 102m/s.

    From Linbide's guide

    he following table indicates the maximum revolutions within acceptable safety limits and without impairing the use of the saw blade, As a rule the optimum operating R.P.M. is 20% to 35% below the maximum operating revolutions. Generally saw benches, portable saws and cut-off saws have a peripheral cutting speed of 50 to 60 m/sec.
    The recommended rpm's for a 500mm saw are 2300rpms at 60m/s, that's 33% below their max recommended speed for hardwood and a bit more for softwood so a bit higher is not going to be drastic but. So one would assume their recommended max rev's for a 700mm blade is going to be significantly below 2800rpm.

    The 500mm blade on my Pickles saw @ 2800rpm is 73m/s.

    Have fun,
    Alli

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  3. #32
    Join Date
    Jul 2009
    Location
    ottawa canada
    Posts
    266

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    I thought Motor RPMs were 2850 ? Are you guys not on 50 Hz ? I'm spinning my blades 3450 .
    All tools can be used as hammers

  4. #33
    Join Date
    Apr 2014
    Location
    Little River
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    Quote Originally Posted by jgforsberg View Post
    I thought Motor RPMs were 2850 ? Are you guys not on 50 Hz ? I'm spinning my blades 3450 .
    A 2 pole motor runs at 2850 rpm but a 4 pole motor will give you 1425.

  5. #34
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    Jul 2009
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    ottawa canada
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    Quote Originally Posted by Bohdan View Post
    A 2 pole motor runs at 2850 rpm but a 4 pole motor will give you 1425.
    Oh i thought Matty only had One Pole
    All tools can be used as hammers

  6. #35
    Join Date
    Sep 2008
    Location
    Petone, NZ
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    68
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    2,808

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    Quote Originally Posted by L.S.Barker1970 View Post
    ...it has a 2.75 HP motor and does 2800 rpm, it makes some air and noise when it runs !
    Quote Originally Posted by Alli
    700mm crosscut saw.
    You are going to have a few of those puny 450mm CC boys all upset.
    She's right Matty.

    I've been looking at the specifications for the CC. It has 5hp to spin an 18" blade at ~3000rpm. Your AC has just 2¾ hp to spin that wopping great 27½" blade at about the same speed.

    Inside the blade guard of the CC has “AC 419” cast into the 18” blade cover...

    aCCNo.jpg

    ...suggesting that maybe the AC was only intended to have an 18” blade. Are you sure that puny motor will handle the large blade?

    Cheers, Vann.
    Gatherer of rusty planes tools...
    Proud member of the Wadkin Blockhead Club .

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