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  1. #1
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    Default Hand taper pin reamers, spiral flute v straight flute

    I need to ream a couple of flogged 1/2" holes to take a #9 taper pin. The job is a 3.5"dia cast iron boss with a 1.5" 1045 steel shaft.

    Looking on ebay I see c-tool at the moment has both straight and spiral flute taper pin reamers, is one better than the other for what I need to do?

    Briefly I looked at prices for Suttons #9 taper reamers, $200+.

  2. #2
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    Quote Originally Posted by bob ward View Post
    I need to ream a couple of flogged 1/2" holes to take a #9 taper pin. The job is a 3.5"dia cast iron boss with a 1.5" 1045 steel shaft.

    Looking on ebay I see c-tool at the moment has both straight and spiral flute taper pin reamers, is one better than the other for what I need to do?

    Briefly I looked at prices for Suttons #9 taper reamers, $200+.

    If you are reaming a plain hole, it does not matter, other than a spiral flute reamer may chatter less.

    But if you are reaming through the periphery of parts creating an interrupted cut, a spiral flute reamer will not catch.

    Spiral flute reamers do of course cost more.

  3. #3
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    Bob out of curiosity how much are both reamers? I didn't buy some when I had the chance and when I went back to my friendly Singapore tapered reamer lady to get them she'd gone and shifted out to the whoop whoop somewhere, and I don't feel inclined to go chase her!

    I've only ever used straight reamers so can't help you on the difference I'm afraid. What Chris has said is quite correct, straight out if the textbook. I've heard the spirals work a little smoother, but that's just hearsay and I have no experience with them. In this case I'd probably stick with straight as they would be easier to set up to sharpen, but I confess I sometimes get chatter on larger reamers so wouldn't mind trying spirals.

  4. #4
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    Hi Bob,
    I am pretty sure it only makes a big difference if reaming from a step drilled hole but if you are just bringing a hole out to a larger size, it should be ok.
    I have this information from theoretical knowledge and practical experience
    I am also quite sure I have a #9 reamer if you would like to borrow it as well.
    Even though the entire contents of my workshop are in the corner of a garage, I can still access it easily. Don't worry about damaging it as I got them from a bloke who 'thought I might be able to use these things'.
    He didn't want any money for them.
    PM me if you want to borrow it. It would be less expensive for what could be a one off use.

    Phil

  5. #5
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    Quote Originally Posted by Steamwhisperer View Post
    Hi Bob,
    I am pretty sure it only makes a big difference if reaming from a step drilled hole but if you are just bringing a hole out to a larger size, it should be ok.
    I have this information from theoretical knowledge and practical experience

    Phil
    Well based on that, do you find the spiral tapered reamers worth the extra expense in terms of performance?

    I've never tried sharpening a spiral reamer, but it think I'd need to make up a special finger to get enough clearance to sharpen them, not a big deal I suppose, but just another thing to worry about when grinding.

  6. #6
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    Quote Originally Posted by Pete F View Post
    Well based on that, do you find the spiral tapered reamers worth the extra expense in terms of performance?

    I've never tried sharpening a spiral reamer, but it think I'd need to make up a special finger to get enough clearance to sharpen them, not a big deal I suppose, but just another thing to worry about when grinding.
    I'd buy spiral ones if the price difference wasn't extortionate (ie more than double). Chances of using them enough for them to need resharpening in my lifetime - slim to none.

    Personally I use roll pins though I do recognise that there are occasions where a taper pin is a better choice.

    PDW

  7. #7
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    Quote Originally Posted by Pete F View Post
    Well based on that, do you find the spiral tapered reamers worth the extra expense in terms of performance?

    I've never tried sharpening a spiral reamer, but it think I'd need to make up a special finger to get enough clearance to sharpen them, not a big deal I suppose, but just another thing to worry about when grinding.
    Hi Pete,
    Definitely the spiral one is the better to use.
    If you have to use a straight flute, slow and steady is the way to go.

    Phil

  8. #8
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    Ok thanks guys I'll give the spiral reamers a go then. I've been meaning to buy some more regular hand reamers in sizes I don't have, and Alan just very kindly informed me of an alternate Singapore Reamer Lady to my old friend, Kitty I think her name was from memory. Kitty the reamer lady, though she was good for taps and dies too. I'd never sharpen them so it wouldn't matter what type I bought, but larger tapers I'd give them a touch up if they ever needed it. Never say never in the sharpening dept. Peter, you just never know what jobs may be around the corner!

  9. #9
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    Quote Originally Posted by Pete F View Post
    Kitty I think her name was from memory. Kitty the reamer lady,
    You're spending far too much time in S.E Asia

    Sorry, couldn't resist.

    Phil.

  10. #10
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    Quote Originally Posted by Machtool View Post
    You're spending far too much time in S.E Asia

    Sorry, couldn't resist.

    Phil.
    There's a joke at work, how do you know you're spending too long up in Asia?

    The footprints on the hotel toilet seat are your own!






    gawd, I hope the PC police have a sense of humour!!!

  11. #11
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    Thanks for the kind offers of assistance, steamwhisperer and stix012.

    After dismantling the job, what were thought to be flogged holes turn out to be f....d holes. Plan B is being formulated.

  12. #12
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    Quote Originally Posted by Pete F View Post
    There's a joke at work, how do you know you're spending too long up in Asia? The footprints on the hotel toilet seat are your own!
    You're bringing back bad memories of when I worked in Jakarta.... and wished I had some of those ankle height gum boots.... PDW

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