CNC routers and spindles

Discussion in 'The DIY Tool Shed' started by GunsOfBrixton, Nov 7, 2015.

  1. adirondak5

    adirondak5 Wood Hoarder Extraordinaire

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    I've used my touch pad with the .023 and .031 bits I have Robert , but I think I'll start using the same method as you suggest , its nerve wracking watching that small bit come down to the touch pad , I keep expecting to see it snap. If I get a chance tomorrow I want to cut a few test slots and see what width I get with a feeler gauge with these .021 bits.
     
  2. GunsOfBrixton

    GunsOfBrixton Tele-Afflicted

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    Herb, you ever get a chance to cut some fret slots with the .021" bit?
     
  3. adirondak5

    adirondak5 Wood Hoarder Extraordinaire

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    Not yet Robert :oops:, between the kids , a nasty virus that's made it through everybody in the house and good old tax time I haven't gotten around to it yet , hopefully this week
     
  4. telemcCaster

    telemcCaster Tele-Holic

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    there's a little hint. You're going to zero your Z height on the spoil board. Or wherever you are going to zero it. Put the small cutter in the keep it slightly loose. Then jog down to the surface. Slowly until it touches. In the bit will slide. Stop jogging once it starts to slide. 0Z. Tighten the Collett.
     
    nickhofen likes this.
  5. rowka

    rowka Tele-Meister

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    I plugged that little fret bit into my trial copy of GWizard.

    Here's what it says:
    Assuming 0.09 bit stickout (the length of the small tip diameter)

    Aggresive
    25000 RPM
    0.078 depth of cut
    9.7 IPM

    Conservative
    25000 RPM
    0.0782 depth of cut
    3.4 IPM

    ---------------------
    Aggresive
    25000 RPM
    0.0142 depth of cut
    18.9 IPM

    Conservative
    25000 RPM
    0.0142 depth of cut
    3.4 IPM

    --------------------
    Aggresive
    25000 RPM
    0.0105 depth of cut
    21.1 IPM

    Conservative
    25000 RPM
    0.0105 depth of cut
    3.4 IPM


    What this is telling me is that the bit wants to travel at least 3.4 IMP at 25000 to maintain minimum chip loading.
    It can handle higher feed rates, but the depth of cut (and therefore deflection) is the limiting factor for the high end of the feed rates.
     
    Last edited: May 12, 2016
  6. rowka

    rowka Tele-Meister

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    If I slow the RPMs, the feed rates also slow down, to preserve the minimum chip loading.
     
  7. Maxbra

    Maxbra Tele-Meister

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    I´m thinking of upgrading my CNC with a new spindle. Currently using a makita (700w) and it works fine, but I kind of need it in the workshop, and I wouldn´t mind something with less noise..

    What do you think of this spindle from Tekno
    https://www.damencnc.com/en/milling-motors/teknomotor/hf-motor/1241

    Or should I go the "chinese" route?

    The above 0.6kw tekno is 2.8 kg and thats no problem. I know my machine can handle 1.2 kw chinese spindle, 3.5 kg

    I would love a 2.0kw with ER20, and economically it´s possible, but i really think it´s to heavy for my machine.. 5-6 kg

    I´ll need a VFD, some collets, brackets and tuning for either and thats fine, but I wish to stay under 7-800 € total.

    I guess my question is - Do I gain anything with a Tekno verus a stronger, chinese spindle, is the Tekno a superior product..?
     
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