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  1. 08-02-2025 #1
    dudz's Avatar
    Lives in Dunedin, New Zealand.
    dudz
    Last Activity: 09-02-2025 Has a total post count of 295. Received thanks 2 times, giving thanks to others 79 times.
    I have an alpha 025 hss cse-25 countersink bit. (3 flutes)

    I tried for the first time today, pushing it into a 12mm dia through hole in mild steel on the cnc mill. I used 250rpm (my cnc mill lowest rpm). Surface speed of 20m/min - plunge rate of 64mm/min . That's what fusion through out. I'm using flood coolant

    I pulled it up half way on each hole to remove swarf and continued. Ok until I got 2/3rds of the way in. It sounded like it was rubbing - then pushed up further into the ER32 collet and span in the collet. Now got to order a new collet.

    Was I way out on the feeds/speeds ?
    Last edited by dudz; 08-02-2025 at 06:36 AM.
    Swedish Storbro Luna - 3 axis CNC mIll - 250 - 2500rpm / 1.1 tonne

    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle..... CSLAB CSMIO/IP-M 4-axis Ethernet Motion Controller....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.
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