S/F - Small holes in mild steel.

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Thread: S/F - Small holes in mild steel.

  1. #1
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    Default S/F - Small holes in mild steel.

    Hi folks,


    I'm learning CNC machining and have been lucky enough to get access to a XYZ Proturn SLX 1630 Lathe and XYZ SMX Prtototrak 2500 Mill. (Conversational CNC machines)

    I'm past the 'absolute beginner' stage and I'm working on a small project, one of the parts is a small block with approx 400 small pockets, 1mm dia x 0.5mm deep (0.0393" x 0.0196").
    The material is mild steel,
    delivery notes class it as BS970 Bright.
    I'm using 1mm end mills for the dimples (Maybe I should have used a drill, but didn't have one that small when it came to do them)
    My mill maxes out a 3500rpm

    This block is only 30mm long and the slot is 3mm wide.
    S/F - Small holes in mild steel.-getfileattachment-jpg


    I'm breaking cutters quite often - after talking to our tooling supply rep, they said part of the problem could be the 'budget' collet I'm using that has a 10 micron run-out. I have a higher precision 5 micron run-out on order.

    What sort of vertical feed speed should I be aiming for? I'm currently in the 10-20mm/min range, should I be trying something different?

    Thank you,

    Steve




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  2. #2
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    Default Re: S/F - Small holes in mild steel.

    For all those dimples I'd prefer to use this type of tool.
    https://www.ebay.co.uk/itm/4x-HSS-60...gAAOSwrYNbTegN
    More sturdy than trying to use a tiny drill bit.



  3. #3
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    Default Re: S/F - Small holes in mild steel.

    Sometimes you just need the obvious pointing out

    Got a load of those in a draw here and I never thought about using one

    Thanks.



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S/F - Small holes in mild steel.

S/F - Small holes in mild steel.