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Thread: taps and dies
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10th Mar 2012, 10:38 AM #16New Member
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Bryan I like your chart because it answers my question about tapping different types of materials, 50% thread for iron and steel and 75% thread for brass/aluminium and plastics, and gives the corresponding drill sizes.
Ewan, I guess I wont be needing the engineers black book just yet. As an aside, if you google "Engineers Black Book" you find out all about female orgasms and how to attract women.
thanks to you both for your input, this has been a very informative thread.
Doug
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10th Mar 2012, 10:43 AM #17.
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Facts about Tapping
A while ago I scanned and posted a Greenfield Tap and Die publication. Could prove useful.
http://www.woodworkforums.com/f65/fa...cation-137810/
BT
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10th Mar 2012, 12:23 PM #18New Member
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10th Mar 2012, 12:50 PM #19Most Valued Member
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Pleasure Doug, glad I could be of some assistance, however I think others have provided far more useful information than my little spiel.
With regards buying taps, dies, and drills, for others considering them, I think the internet is your friend. I'm in a very lucky position to be able to buy very good quality Japanese taps/dies and British drills, all at the right price. However I've also bought a stack of Eastern European taps and dies through ebay and have been extremely happy with them. I've seen those "box sets" of taps and drills and to be honest I think one can do better for the same (or less) price elsewhere. Having gone down the path of having "not so good", "totally crap", and then "very good" taps and dies and drills, I would urge others not to make the same mistake as I did. I appreciate that we all want to save money, and goodness knows this is a hellishly expensive hobby, but this is one area where I suggest definitely buying the best possible. It was only when I finally started using good quality taps that I realised just how easy and good the results could be.
Pete
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10th Mar 2012, 01:03 PM #20.
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10th Mar 2012, 01:14 PM #21Most Valued Member
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I actually keep a simple expanding arbour on my shelf with a broken Mumbai special it Bob. I was hoping to quickly knock up the arbour to secure a job but it now serves as a reminder to listen to wise people like yourself when they urge me not to buy cheap taps
Pete
PS As you see I now try to pass that mantra on!
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10th Mar 2012, 01:21 PM #22
I agree with Pete, wheni first started buying taps I got some p and n carbon steel taps. These ate probably better than the Mumbai specials, but a far cry from a good hss tap. I now buy only dormer taps as it is what they have at the local shop. I especially like the gun nose taps (e192 o think) these are a straight tap with a "spiral" or angular nose, and they cut like butter. In through holes they produce 3 even coils of fine triangular wire, not chips. I'm sure they do the same in blind holes but of course you can't see it. I also always use tap magic and clean my taps with a toothbrush before outing them away.
On removing broken taps I still have a jig that I made some 7 or 8 years ago that I use regularly that has one "out of sequence" locking bolt, and right next to the bolt is a ground back partially filled hole.....yep the taps still in there!
Ewan
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10th Mar 2012, 01:36 PM #23Most Valued Member
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Ha ha, I love the "features" some projects acquire. Like last night, it was dark but I just wanted to screw some temporary brackets to some timber. The whole lot will be coming down in a few weeks and thrown in the bin, so I wasn't too fussed. The trouble was I bought a bunch of cheap screws from Aldi, what could possibly go wrong? 45 minutes later, on a job that should have taken 1/10th that I reminded myself, as my impact driver snapped yet another head off, not to buy cheap screws in future. That little job certainly has a lot of "feature" in it now
This is the ebay store for the guy I've bought taps and dies from a couple of times ICT industrial cutting tools items - Get great deals on metric fine dies Mf, HSS drills items on eBay Stores! I think Bob and Greg Q have also bought from him, no doubt many others.
Pete
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10th Mar 2012, 01:44 PM #24Product designer retired
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Unbrako Fasteners
Unbrako have a lot of info re fasteners, tapping drill sizes etc.
See here http://unbrako.com/docs/engguide.pdf
Ken
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