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Thread: What did you learn today?
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21st Apr 2020, 10:25 AM #781
No missprint Kryn surely not Suttons? redilled other 3 to 11/32 I should get all done today not take 2 days to tap 40mm deep. The shoulder best hold up tho.
Kryn I got disillusioned early when arriving from the UK put into 1st class only to be dropped back to kindy 3 months latter, age not level was the reason. Then as my medical condition raised its head discrimination from teachers did also. Not just me but it opened my eyes to those who not disabled were being either socio-economic or due to parental employment as well.
Like your example saw that a few times, students pointing out often how wrong books we were learning from were, meaning teachers were not checking things.
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21st Apr 2020, 10:56 AM #782Most Valued Member
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21st Apr 2020, 11:33 AM #783
Stu yes 1.5mm it is close but 40mm depth through solid bar ex-ram not easy even with a new tap and 300mm tap wrench. These are machine jacks riser for mill job/s.
I'll be able to screw them to T-bolts in the ways as well as height adjustment, hence 40mm right through. I originally was going to do fine thread for top adjustment.
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21st Apr 2020, 12:06 PM #784Diamond Member
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Good morning All, As has been mentioned 8.5 mm is the normally quoted tapping drill diameter for an M10 cut thread. It gives around 77% thread depth, which is about as high as you would normally go. An 11/32" drill gives a lesser thread engagement at around 66%, still quite adequate for most occasions. If your application calls for a higher %age thread engagement, and you are threading some pretty tough material, serial taps may be worth trying. For those who have not come across them they come in sets of three just like many hand taps do, but instead of having varying amounts of taper, they gradually increase in size. You start with the first one, run it through, then the second one being a few thou larger, cuts a little extra, and the third one cuts more again and takes the thread to final size. I have not seen these for sale in Australia, but one of the U.K. Engineering shops has had them, maybe either Chronos or Arc-Euro Trade.
Here is a handy drill chart on line which allows you to choose the thread percentage for both cut threads and formed threads, so if you have an unusual application, the info is there for you to select as appropriate.
Tap drill size calculators
I hope that this is of some use,
Rob
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21st Apr 2020, 02:39 PM #785
Thanks Rob.
The 11/32 should be ok for my use, not a ton of force being exerted.
They sound great guess they use them more in CNC than hand tapping tho. Will check with cousin who is installation engineer for Doosan UK.
I've always hated hand tapping no matter the size, material differs greatly.
My apprenticeship days tapping 7/16 holes in bearers & angle iron of buses & coaches for seating in the isle area & side channel thats up to 60 holes plus some. Of course this is after ply flooring and tiles/rubber or carpet is laid. Break a tap and you could spend a day or two getting it out, very little chance of re-drilling a new hole unless absolutly required. Breaking drill bits was bad enough.
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21st Apr 2020, 03:26 PM #786
Hi Guys,
Just to add to Rob's post Arc-Euro Trade in the UK have them. I have some M9 and M10 ones and find them very good and easy to use.Best Regards:
Baron J.
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21st Apr 2020, 03:29 PM #787
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21st Apr 2020, 03:48 PM #788Diamond Member
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21st Apr 2020, 05:55 PM #789Most Valued Member
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The 11/32 would of been the Imperial tapping size for your Metric tap, not sure what experience you have but unless it is critical always drill oversize when tapping, even the smaller threads can usually be catered for with Letter or Number drills.
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21st Apr 2020, 10:38 PM #790Most Valued Member
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Thanks for this Rob, hope you don't mind, I put this into;
https://metalworkforums.com/f218/t20...ize-calculator for all to find easily.
KrynTo grow old is mandatory, growing up is optional.
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22nd Apr 2020, 12:01 PM #791
Well neighbour took pity on me brought over a new spiral fluted tap and an old P&N tapper tap. The P&N was as tough to cut with as mine were. As he's an old BHP engineer even he said it was hard material. Swapped to the fluted tap 10mins from starting it on the lathe, to finishing it by hand.
Guess who is looking for a fluted set pf taps.
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22nd Apr 2020, 01:43 PM #792Most Valued Member
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22nd Apr 2020, 10:59 PM #793Diamond Member
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If you are looking for spiral fluted taps, or for that matter many other tooling requirements as well, I can recommend these folks. https://shop.gbrengineering.com/inde...unction=SEARCH They also trade in eBay as cnc-poorboy, but if you deal directly with them it will cost you less in my experience. I'm not sure how they work things, but quite often they will have identical items listed with different prices, or some with free shipping, so it pays to go right through the listings as at times it can be a money saver. Everything that I have bought from them has been of excellent quality and I believe of European manufacture.
A comment you made in an earlier post about the serial taps being for cnc use, may or may not be strictly correct, I have always assumed that they were for hand use. However I have been known to be incorrect myself, so if anyone else is full bottle on that subject, please chime in with the good oil.
For HavinaGo who wanted a picture of a broken tap, I hope that this one will suffice, it was the best I could do at the moment.Screen Shot 2020-04-22 at 9.32.34 pm.png
And finally thanks for all the likes, I hope that you are all keeping safe and enjoying your extra shed time if indeed you are getting that extra time,
Rob
PS. I have just checked the preview of this post and it has not loaded the link correctly. I had selected their page with M10 taps in the search box, but it has just sent their front page. Just put whatever you want into the search box, you can also select your currency, and then make your choices. When I have purchased from them VAT was automatically deducted without my requesting it, it should still be the same but it won't hurt to check yourself that all is pucka.
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23rd Apr 2020, 10:28 AM #794
Thanks for all that will check site today.
yep thats a broken tap for sure.
Ever seen mad Irish mechanic who broke a tap re-tapping a spark plug thread he stripped? He must have been IRA he exploded.
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25th Apr 2020, 05:23 PM #795Golden Member
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Serial Taps
I don't know about full bottles of good oil, but I purchased these serial taps at a sale (possibly one of those legendary MacPherson's sales) in the mid 1970s when NC machining was not so common. At the time it was explained to me that serial taps were a European concept, either outmoded or just not popular here. Of course it could still be that they were (and are) intended for automated tapping, but Narex seems to have always concentrated on hand tools, and still does.
IMG_3461.jpg
Bill