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  1. #1
    I got 5 end mills from eBay - 6mm Straight Shank 3mm End Mill Bit for Aluminum Iron | eBay

    However they don't seem to have any teeth that go all the way to the centre of the cutter. I expected that 1 of the 3 teeth would do. Does this mean it can't plunge? Why does it have this rather deep slit on the cutting end?

    They call it a slot drill so I took that to mean it will plunge.




  2. #2
    Without the flute extending to the centre it will not plunge and even if it did I would avoid plunging on a router as it puts a substantial force on the gantry, leading to reasonably large tool deflection. Does the hole in the end go all the way through? If so its purpose may be for flood coolant.
    Old router build log here. New router build log here. Lathe build log here.
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  3. #3
    No, it doesn't go all the way, though interestingly there is a similar recess on the other end but it is only a few mm deep.

    Poo, I'll have to send 'em back.

    Anyone know of a well priced 3mm cutter with 6mm shank and about 12mm depth of cut?

  4. #4
    I mostly work with mild steel, so always buy slot drills rather than end mills. I get them from Warco as they supplied my machine and seem to be competitively priced on tooling. I've had the slightly cheaper cutters from eBay and they don't seem to last as long.

    http://www.warco.co.uk/drill-sets--d...s---plain.html
    Last edited by birchy; 25-02-2013 at 09:27 PM.

  5. #5
    These look good :)

    5 X 3mm Spiral Double Flute HSS Milling Cutter CNC Bits High Quality | eBay

    However before I found that I found some new old stock and bought those.

    http://cgi.ebay.co.uk/ws/eBayISAPI.d...E:L:OC:GB:3160
    Last edited by Tenson; 25-02-2013 at 11:22 PM.

  6. #6
    Why do you need them to plunge if you don't mind me asking? Reason for the question is that I have read that it is always better to ramp down into the substrate rather than plunge.

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