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  1. #1
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
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    2,651

    Default Large 82degree countersinks

    I need to countersink steel plate for some 1/2" UNC countersunk head socket screws.
    Angle is 82deg, and the head diameter is just over 23mm - practically 1".
    I only have do 4 holes.

    Not having much luck locally getting hold of a suitable countersink, so looking like I might have to make one or find another method - such as offsetting the job in a 4 jaw chuck on the lathe and cutting the countersinks with the compound.

    Any suggestions for a source to buy one from or an alternate method to make a tool (or the countersinks themselves) would be welcome!

    Steve

  2. #2
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
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    1,522

    Default

    Im seeing quite a few on US ebay, how quickly do you need one? I would think piper tools in Sydney would also make or stock one with no issue.

    Sent from my SM-G973F using Tapatalk

  3. #3
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    I searchex high and low for 82. No one uses them in here, just use 90...was the answer I recieved a few times. I cant believe how easy it is to get unc/unf countersunk fasteners but not a 82 countersink.

    So rather then get one and wait from the states I changed to metric countersunk fasteners.

    Needing to place an order with Travers soon and one maybe 2 is on the list.

  4. #4
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    I searched high and low for a 82. "No one uses them here, just use 90"...was the answer I recieved a few times. I cant believe how easy it is to get unc/unf countersunk fasteners but not a 82 countersink.

    So rather then get one and wait from the states I changed to metric countersunk fasteners.

    Needing to place an order with Travers soon and one maybe 2 is on the list.

  5. #5
    BobL is online now Member: Blue and white apron brigade
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    7,182

    Default

    The 3 year old Chinese ones I got from ebay are working well enough for me

    https://www.ebay.com.au/sch/i.html?_...+Tool&_sacat=0

  6. #6
    Join Date
    Oct 2008
    Location
    N.W.Tasmania
    Posts
    1,407

    Default

    These blokes look like they might have them, I just did a google search and found this page, I have never dealt with them and have no idea of prices, but they look pretty serious and stock high end stuff so probably not too cheap. Worth a call if you need it now though.
    Countersinks & Counterbores - Millers Tooling, Brisbane, Australia good luck,
    Rob

  7. #7
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    I just grind a drill bit to suit and then put it in the ‘special grinds’ box with a label on it

  8. #8
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Quote Originally Posted by racingtadpole View Post
    I just grind a drill bit to suit and then put it in the ‘special grinds’ box with a label on it
    That's what I've done in the past.
    Kryn
    To grow old is mandatory, growing up is optional.

  9. #9
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
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    Default

    I also, for kid of similar features use a stick of hss in the boring head with the correct angle ground on it, you need to nibble away but can get good results at no cost.

    Grinding a drill is a good idea but a 1" twist drill is pretty spenno.

    Sent from my SM-G973F using Tapatalk

  10. #10
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Steve if they are long enough you could hold the screws in the chuck and re cut the angle, if they are a bit short for that drill and tap a bit of rod to screw them into, taper the end of the rod for tool clearance and the end of the bolt should bottom out so the screw wont move while recutting the taper....

    ummmm....i was guessing that you had a 90 deg countersink ?
    Last edited by shedhappens; 15th Dec 2021 at 07:52 PM. Reason: afterthought

  11. #11
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,434

    Default

    Hi Guys,

    I have some of the "Weldon" type countersinks, brilliant for chatter free cutting. You could use your boring head and a shaped cutter in the mill, though I admit that I've ground a drill before now to do that job.
    Best Regards:
    Baron J.

  12. #12
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
    Posts
    1,010

    Default

    I have never bought from this Mob, but they have this one https://wallersindustrialonline.com/...ca54d9e4&_ss=r they also have a smaller one https://wallersindustrialonline.com/...ca54d9e4&_ss=r
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  13. #13
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    Quote Originally Posted by caskwarrior View Post
    Grinding a drill is a good idea but a 1" twist drill is pretty spenno.
    Under $20 locally supplied from Melbourne doesn’t seem particularly rich to me
    https://www.ebay.com.au/itm/22263494...8AAOSwILFZrjH1

    Yeah a Sutton will be 4 times the price, but if you only have a few to do and are likely to get infrequent future use, a chinesium drill is quite adequate.

  14. #14
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
    Posts
    2,651

    Default

    Thanks guys - some good suggestions there.

    Quote Originally Posted by racingtadpole View Post
    Under $20 locally supplied from Melbourne doesn’t seem particularly rich to me
    https://www.ebay.com.au/itm/22263494...8AAOSwILFZrjH1

    Yeah a Sutton will be 4 times the price, but if you only have a few to do and are likely to get infrequent future use, a chinesium drill is quite adequate.
    I was scratching around last night for something suitable, and completely forgot I have a set of those blacksmith drills. I think there's a 25mm one in the set
    I've no problem sacrificing one of those!!

    Steve

  15. #15
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
    Posts
    654

    Default

    I believe I have a 27mm dia 82deg Weldon in a set, would be happy to post to you if I find it tomorrow, looked in the house storeroom just now and found a newer set to 25mm but 90 deg. I eliminated a number of hiding spots tonight and believe I know where to look in the packed up stuff in the barn tomorrow if that's any use to you, bought them in from a tooling supply in US about 15 years ago. PM an address if you want to go this way, I'll get back to you to confirm when I find it.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

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