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Thread: TP grinder take 2

  1. #1
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    TP grinder take 2

    Hey guys,

    Had a bit of a disaster with my original tool post grinder so decided to make a new one. The first model ran a motor from a ride on toy car but unfortunately lacked grunt not to mention torque. It did perform adequately until I needed to cut a square shaft on the mini with a 10mm milling cutter then gave up the ghost. The power supply overheated, motor stopped.
    Here's model 2 and hopefully better.

    TP grinder take 2-img_20190701_123639.jpg

    TP grinder take 2-img_20190701_123737.jpg



    cheers stevoh
    Last edited by Stevohdee; 07-03-2019 at 09:20 AM.

  2. The Following 6 Users Say Thank You to Stevohdee For This Useful Post:

    bruce.desertrat (07-03-2019), G.Paul (07-07-2019), garage nut (07-05-2019), Jon (07-04-2019), PB Machines (07-07-2019), Seedtick (07-04-2019)

  3. #2
    Supporting Member olderdan's Avatar
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    Nice work Stevoh and my kind of video. I like your old school methods and have long admired your hand engraving skills. A nice little grinder but perhaps not up to milling work in that configuration.

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    Thanks Stevohdee! We've added your Tool Post Grinder to our Machining category,
    as well as to your builder page: Stevohdee's Homemade Tools. Your receipt:




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    Quote Originally Posted by olderdan View Post
    Nice work Stevoh and my kind of video. I like your old school methods and have long admired your hand engraving skills. A nice little grinder but perhaps not up to milling work in that configuration.
    Thanks older Dan, yep perhaps some light milling I might get away with but we tend to push boundaries don't we. Live & learn... Cheers mate

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    What would be the perfect motor for this type of application.

    I do not have a sparky with a box full of motors Aliexpress here I come.

    Is 3580 rpm fast enough?

    What speed control did you use?

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    Quote Originally Posted by garage nut View Post
    What would be the perfect motor for this type of application.

    I do not have a sparky with a box full of motors Aliexpress here I come.

    Is 3580 rpm fast enough?

    What speed control did you use?
    The speed control is JYQD_V7. 3E1, brush less motor controller, can find on Google. The motor says BG42830 on it, but I can't find it online. I haven't tested motor thoroughly yet but it has plenty of torque so I reckon fast enough for what I do, cheers

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    Thanks diy swede

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    Thanks

    Would the bearings of the previous design not be more accurate and longer lasting than the motor's?

    I want to build this only once, but do not think I will ever use it as a mill, just a grinder.

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    Quote Originally Posted by garage nut View Post


    Thanks

    Would the bearings of the previous design not be more accurate and longer lasting than the motor's?

    I want to build this only once, but do not think I will ever use it as a mill, just a griftnder.
    s there

    Dear gn
    Bearings technology has come a long way, but you get what u pay for. I did notice the bearings in my current motor looked similar to the ones in the shaft in my first so I guess a decent motor runs decent bearings. (they were both sealed) and If you run er16 collets in your grinder the the option to mill or drill is always there, so maybe there'll come a time...

    All the best
    Stevoh

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