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Thread: Very poor mans cnc setup

  1. #1
    Supporting Member thehomeengineer's Avatar
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    Very poor mans cnc setup

    Hi All
    This is the only way I could think of to machine six internal radius on a gear for my Foden Steam Wagon. As can be seen from the photos I used a rotary table in conjunction with an indexing head. With some careful setting, up I was able to use the rotary table to cut the radius between the two-known start and finish angles (hand to calculate) and the indexing head simply allowed for the gear blank to be positioned at the six equally spaced positions. The rotary table, after cutting the first radius was returned to its original start position and the indexing head moved to the next location, this radius was then cut to the same start/finish angle as before and so on until all 6 radiuses were cut.

    A CNC machine would have made this a whole lot easier, but as I don’t have one the challenge was overcome with a little bit of thinking outside the box.

    Very poor mans cnc setup-dscf1208.jpg.opt652x489o0-0s652x489.jpg Very poor mans cnc setup-dscf1210.jpg Very poor mans cnc setup-dscf1211.jpg.opt652x489o0-0s652x489.jpg

    Bottom left gear, finished with the six internal radius cut
    Very poor mans cnc setup-dscf1213.jpg.opt652x489o0-0s652x489.jpg

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    The Home Engineer

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  2. The Following 22 Users Say Thank You to thehomeengineer For This Useful Post:

    bigtrev8xl (Feb 17, 2018), brianpoundingnails (Jun 13, 2018), BrianW (Jul 23, 2020), davidhoneybadger (Jun 13, 2018), drivermark (Feb 17, 2018), FEM2008 (Jul 24, 2020), jjr2001 (Feb 16, 2018), johncg (Oct 16, 2022), Jon (Feb 16, 2018), Kevic (Jun 15, 2018), MeJasonT (Oct 11, 2018), mwmkravchenko (Feb 16, 2018), nashty1 (Feb 16, 2018), NortonDommi (Feb 17, 2018), Papa Bill (Feb 17, 2018), Paul Jones (Jun 13, 2018), PaulM (Feb 17, 2018), PJs (Feb 16, 2018), Ralphxyz (Apr 21, 2023), Seedtick (Feb 16, 2018), Toolmaker51 (Jun 13, 2018), winmac (Oct 15, 2022)

  3. #2
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    Thanks thehomeengineer! We've added your Internal Radius Cutting Method to our Machining category,
    as well as to your builder page: thehomeengineer's Homemade Tools. Your receipt:




    2000 Tool Plans

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    Supporting Member Radioman's Avatar
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    Beautiful work! I wish my mind was as dialed in as yours.

  5. The Following User Says Thank You to Radioman For This Useful Post:

    thehomeengineer (Jun 14, 2018)

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    Supporting Member brianpoundingnails's Avatar
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    Necessity is definitely the mutha#%&er of invention.


    Hand, Head and Heart(mostly hands)

  7. The Following User Says Thank You to brianpoundingnails For This Useful Post:

    thehomeengineer (Jun 14, 2018)

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    Supporting Member Toolmaker51's Avatar
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    How many times we think "I don't have a CNC, but I want to make..."

    It's good to run into that, if next thoughts are "...but I have a _____ and ______..."

    I figure translation is "I'll do what THEY would have had done".
    Milling machines hum along doing certain things, but like homeengineer demonstrates here, tooling really makes them sing.

    Don't let automation erase creativity. Let desire or need pull the strings.



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    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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