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  1. 10th May 2014, 11:25 PM #1
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    Default How to find out lathe speeds

    I have an old lathe that is not labelled with speeds. It has 3 speeds, and a back gear for a 2nd three speeds. Anyone got any good ideas for how to find out the speeds? (Short of buying any fancy equipment for measuring lathe speeds.)
    Good things come to those who wait, and sail right past those who don't reach out and grab them.
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  3. 10th May 2014, 11:38 PM #2
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    Get a digital Tacho, they are less than $14 on ebay.
    http://www.ebay.com.au/itm/New-Digit...item417f040e26
    Cliff.
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  4. 10th May 2014, 11:56 PM #3
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    I would think there is a mathematical way, based on rpm of motor and size of the different pulleys, But you will have to be much smarter than me to figure it . I'd buy the tool mentioned above, it is no more that a calculator you would have to buy to figure it out mathematically.
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  5. 11th May 2014, 07:50 AM #4
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    Default This thread answers all

    https://www.woodworkforums.com/showth...ht=lathe+speed
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  6. 11th May 2014, 10:18 AM #5
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    If you want to have a go at calculating it, go here.

    blocklayer is a member here.

    http://www.blocklayer.com/pulley-belt.aspx
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  7. 11th May 2014, 05:25 PM #6
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    Quote Originally Posted by Cliff Rogers View Post
    Get a digital Tacho, they are less than $14 on ebay.
    http://www.ebay.com.au/itm/New-Digit...item417f040e26
    Aha, thanks for the link. I hadn't realised these things were so cheap! I also hadn't realised the RPM was written on the motor, so I can calculate pulley ratios from there, although I have 2 levels of pulleys to contend with, plus the back gear - could get interesting! Thanks!
    Good things come to those who wait, and sail right past those who don't reach out and grab them.
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  8. 11th May 2014, 10:02 PM #7
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    Test your maths while you wait for the $14 Tacho to arrive.
    Cliff.
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  9. 11th May 2014, 11:05 PM #8
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    Quote Originally Posted by surfdabbler View Post
    I have an old lathe that is not labelled with speeds. It has 3 speeds, and a back gear for a 2nd three speeds. Anyone got any good ideas for how to find out the speeds? (Short of buying any fancy equipment for measuring lathe speeds.)
    Go here and down load for free, very small file and it works well http://softadvice.informer.com/Downl...alculator.html

    Problem solved you can work out rpms at your leisure
    Inspiration exists, but it has to find you working. — Pablo Picasso

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