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Thread: New VFD plus 1 HP Motor for Mini Lathe or any lathe

  1. #11
    Supporting Member jjr2001's Avatar
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    Thanks Doug, If you noticed the 2.5" diameter stock in the lathe in two of the pictures you will see some
    of the stock I was turning when the original motor gave it up. It cut like butter after I put the new motor/vfd
    on the lathe. Very happy with the huge increase in torque.

    That 2.5" diameter chunk in the lathe is in the process of being turned into your Universal Grinding Fixture.

    Cheers, JR

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    Thanks jjr2001! We've added your Mini Lathe Jackshaft to our Lathes category,
    as well as to your builder page: jjr2001's Homemade Tools. Your receipt:




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    Thanks jjr2001! We've added your Mini Lathe Motor Modification to our Lathes category,
    as well as to your builder page: jjr2001's Homemade Tools. Your receipt:




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    Quote Originally Posted by jjr2001 View Post
    Thanks guys, I really find the new motor setup with VFD puts new life in my little lathe.
    The extra torque is very welcome. One of my next projects for the lathe is to make a new
    set of pulleys for the drive system. Planning on using 3L section kevlar V-belts. I would think
    they will perform much better than the timing belts in use now.

    Cheers, JR
    Hi JR
    Great work on your new drive arrangement, you mention using V belts, have you considered Poly v belts. I have used one on my countershaft drive for some years now and they run really smoothly and the pulleys are easy to machine, never had a problem with slip either.

    New VFD plus 1 HP Motor for Mini Lathe or any lathe-imgp0010.jpg

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  9. #15
    PJs
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    Quote Originally Posted by olderdan View Post
    Hi JR
    Great work on your new drive arrangement, you mention using V belts, have you considered Poly v belts. I have used one on my countershaft drive for some years now and they run really smoothly and the pulleys are easy to machine, never had a problem with slip either.

    Click image for larger version. 

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    I was thinking the same thing last night Olderdan or even a toothed belt. SDP/SI has a full line of toothed, grooved, O'ring, flats and V belts and pulleys for fractional hp use and are even better for torque. Although making the pulleys for a Groove belt would be easier and a fun challenge.
    ‘‘Always do right. This will gratify some people and astonish the rest.’’
    Mark Twain

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  11. #16
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    Hello Dan and PJ, The belts are very interesting with so many types out there.
    I did use a Poly segmented v-belt on my CNC spindle and no problems at all.
    Nice small profile. Seems they use these on vacuum cleaners and sewing machines.

    I wanted to try a 3L section Kevlar belt for the lathe and see how that works out.
    The belts are available for a good price and they look tough.
    Both the lathe to jack shaft set and the motor to jack shaft set will be replaced.
    I planning to have them on hand should all the teeth on my timing belts disappear! LOL


    Thanks for all the suggestions and comments

    Cheers, JR

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    What kind of belt do the one speed brushless mini lathes use? I switched to XL first on my old 7x10 - 3/8” wide ones fit under the belt cover, but they’re only a little stronger than the similarly old fashioned original metric timing belts. They’re easy to find, though, and are easier to replace than headstock gears.

    I think more modern timing belts have bigger capacity.

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  15. #18
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    Quote Originally Posted by threesixesinarow View Post
    What kind of belt do the one speed brushless mini lathes use? I switched to XL first on my old 7x10 - 3/8” wide ones fit under the belt cover, but they’re only a little stronger than the similarly old fashioned original metric timing belts. They’re easy to find, though, and are easier to replace than headstock gears.

    I think more modern timing belts have bigger capacity.
    Hi Threesixesinarow, Not sure what the older single speed lathe uses but I have had the little timing belt rip out on my lathe several times. It is a 3mm pitch and I think like you mentioned if they would have used a 5mm pitch it would have been a lot stronger.

    I am thinking that I would rather have the drive belt slip than rip out the teeth! We will see down the road which approach is the best for me.

    Thanks for the comment,

    Cheers, JR

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    My 7x10 has a poly-vee belt drive now, with a 6-rib J-section belt to the headstock countershaft running on a pair of 1-1/4” pulleys. It hasn’t slipped but my collets only take up to 9/16”, so it’s hard to compare.

    My mill has 3-rib J belts on slightly bigger pulleys and in low gear they can slip, even with just a 350W motor.

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  18. #20
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    Quote Originally Posted by threesixesinarow View Post
    My 7x10 has a poly-vee belt drive now, with a 6-rib J-section belt to the headstock countershaft running on a pair of 1-1/4” pulleys. It hasn’t slipped but my collets only take up to 9/16”, so it’s hard to compare.

    My mill has 3-rib J belts on slightly bigger pulleys and in low gear they can slip, even with just a 350W motor.
    Interesting. My mini mill (500 watt) has never slipped. It uses a timing belt also but it is much wider than the lathe belt and I think it is a 5mm pitch.
    Cheers, JR


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