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Thread: Large 82degree countersinks
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15th Dec 2021, 03:48 PM #1Most Valued Member
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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
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15th Dec 2021, 04:15 PM #2Most Valued Member
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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.
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15th Dec 2021, 04:35 PM #3Most Valued Member
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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.
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15th Dec 2021, 04:50 PM #4Most Valued Member
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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.
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15th Dec 2021, 05:14 PM #5Member: Blue and white apron brigade
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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
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15th Dec 2021, 05:18 PM #6Diamond Member
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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
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15th Dec 2021, 05:50 PM #7Most Valued Member
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I just grind a drill bit to suit and then put it in the ‘special grinds’ box with a label on it
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15th Dec 2021, 06:41 PM #8Most Valued Member
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15th Dec 2021, 06:53 PM #9Most Valued Member
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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.
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15th Dec 2021, 07:06 PM #10Most Valued Member
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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
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15th Dec 2021, 07:51 PM #11
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.
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15th Dec 2021, 08:28 PM #12Diamond Member
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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.
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15th Dec 2021, 09:23 PM #13Most Valued Member
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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.
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16th Dec 2021, 11:58 AM #14Most Valued Member
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16th Dec 2021, 09:28 PM #15
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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