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  1. #1
    Join Date
    Mar 2011
    Location
    Adelaide
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    177

    Default Anyone want to grind a cutter for me?

    I have a tapered cutter on what I believe is an MT3 shank Iíd like touched up.
    Anyone have a T&C grinder, the skills and the motivation to assist?
    Donít mind paying return postage if youíre interstate, and certainly donít expect a freebie (happy to work out a deal, whether liquid currency or legal tender is up to you).
    I donít have a T&C grinder (or the space for one) or the necessary understanding required to use one

    If you are interested and want to have a crack, feel free to message me.

    Also not averse to taking it to a commercial outfit if anyone has any suggestions on where to take it in Adelaide.
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  2. #2
    Join Date
    Jul 2016
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    Melbourne
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    Default

    Do you want to use that as an actual countersink? It would only be good for drilling type ops.

  3. #3
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
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    Default

    Hi Racingtadpole, Guys,

    I might be wrong, but that looks like it might be an awkward cutter to regrind.

    What is its application ?
    Best Regards:
    Baron J.

  4. #4
    Join Date
    Mar 2011
    Location
    Adelaide
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    177

    Default

    Quote Originally Posted by caskwarrior View Post
    Do you want to use that as an actual countersink? It would only be good for drilling type ops.
    Yes I want to use it to cut tapers into holes, I don’t think it’s been taught any other tricks at this point.

    Not prepared to disclose the actual application at this point because if it works I will be looking to commercialise the product. At the moment it’s purely experimental. I could cut the taper on the lathe, but work holding is a bit more challenging.

  5. #5
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
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    3,179

    Default

    Hi Racingtadpole,

    In that case it would be more cost effective to buy a countersink bit. Or if you have any carbide woodwork router bits, use one of them. They work very well as you have probably seen from some of my pictures.
    Best Regards:
    Baron J.

  6. #6
    elanjacobs is offline Apprentice gear maker and machine doctor
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    29
    Posts
    298

    Default

    What's the included angle? I suspect finding a carbide bit that matches (or is near enough) would be both easier and cheaper than trying to sharpen that. Carbitool have a 60 degree https://www.carbitool.com.au/product...solid-carbide/

    Also, is it just the camera playing tricks or are the flutes not actually straight? Cos that'd be a right pain to even think about

  7. #7
    Join Date
    Mar 2011
    Location
    Adelaide
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    177

    Default

    The Pilot hole will be somewhere in the vicinity of 22-25mm, I’ve not seen a router bit that big.

    Yeah it’s semi helical, no trick photography. The cutting head is about 50mm across at its widest, and about 16mm at its smallest so a router bit is nowhere near big enough.

  8. #8
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
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    Default

    Hi Racingtadpole,

    Ouch, that is a big cutter, the one in the picture doesn't look that big. Those teeth look to have a double angle on them.

    I've just been and looked at my router bit set ! My biggest cutter is a 40 mm diameter 45 degree angle one, it is about 10 mm diameter at the small end.

    Are you actually wanting to cut a taper or just deburr ? Also if you are wanting to cut a taper, what angle are you looking for ?
    Last edited by BaronJ; 11th Feb 2020 at 11:03 PM. Reason: Added Questions!
    Best Regards:
    Baron J.

  9. #9
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
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    67
    Posts
    4,347

    Default

    Does it need to be that particular shape? I have a couple of round over router bits that are approx 25mm radius (from memory), if they're of any help?
    Kryn
    To grow old is mandatory, growing up is optional.

  10. #10
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    990

    Default

    Complete saw works lonsdale 8297 6366

    Without exception the best sharpening service in South Australia

  11. #11
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    55
    Posts
    5,480

    Default

    Not what you asked for, but I have a Tree boring head that is capable of boring a tapered hole. If you just need one or two done as prototypes I could help that way.

    Michael

  12. #12
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    510

    Default

    What type of material do you intend to cut with it? It looks like it might have been made as a trade or tech school project and may only be case hardened mild steel.

  13. #13
    Join Date
    Mar 2011
    Location
    Adelaide
    Posts
    177

    Default

    The small end is 16mm, large end is 52, Iíll work out the angle later when Iím not on a bus. Despite it being semi helical the flutes appear to be flat ground as evidenced by the cutting grind becoming larger at the point of rotation around the axis. There may well be some merit in the suggestion that it was an apprentice project, I donít know itís history, it came to me as part of a job lot from a deceased estate.

    My widget needs to be made from steel as it is a wear part of sorts. I may make the prototype out of ally though for no other reason than I have some in about the right size.
    Even if I donít wind up using it for this particular job a sharp cutter is a useful cutter, not so much if itís blunt...

    China, thanks Lonsdale is a 3 water bag trip, but I might try the saw doctor at Pooraka. Never even thought twice about connecting sharpening rotary lawnmower blades with milling cutters. If I donít have any luck there Iíll give your suggested company a call

    Michael, thanks for the offer, I may well be in touch

  14. #14
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    308

    Default Another option?

    These "Taper drills" may be of interest: from https://mcjing.com.au, who do seem to keep some uncommon items.
    Mcjing taper drills.JPG
    I have no connection with the supplier other than as an occasional customer.
    The shank sizes seem a bit spindly particularly on the larger cutters, but that could be addressed.

    I do have one of those on the list - a 36-50mm taper drill acquired for a project, as a blank for re-sharpening to a custom shape.
    36-50mm taper cutter 1.jpg
    However the cutter remains unaltered and unused, sleeping in a drawer.

    Cheers, Bill
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  15. #15
    Join Date
    Mar 2011
    Location
    Adelaide
    Posts
    177

    Default

    That certainly may be another option, thanks

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