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Taps
Apr 26, 2019 0:19:47 GMT 1
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Post by doohanno1 on Apr 26, 2019 0:19:47 GMT 1
I have a Draper set of metric fine taps that i use to clean up any threads before assembly..The small sizes seem to work ok but when i do the likes of the threads on a 4l0 bottom engine case that holds on the damper rod a corser thread appears to get cut... Any links of the taps you guys are using.. I think i need to get a different set. Tks...
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Taps
Apr 26, 2019 3:03:45 GMT 1
Post by JonW on Apr 26, 2019 3:03:45 GMT 1
Taps are sized in not just the thickness, but also the pitch of the threads.
What does the tap say the size is? Im thinking you are using a tap that has the wrong thread in the pitch, ie you need a 1.25 and youre running a 1.5 etc.
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Post by stusco on Apr 26, 2019 7:11:42 GMT 1
Maybe get a set of thread gauges my tap set came with a set and they didn’t come with a m10 fine tap I had to by that separate
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Taps
Apr 26, 2019 8:07:22 GMT 1
Post by JonW on Apr 26, 2019 8:07:22 GMT 1
Agreed, most sets dont come with with 'M10 fine' Ive found as well.
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Taps
Apr 26, 2019 8:19:18 GMT 1
Post by earthman on Apr 26, 2019 8:19:18 GMT 1
Taps are sized in not just the thickness, but also the pitch of the threads. What does the tap say the size is? Im thinking you are using a tap that has the wrong thread in the pitch, ie you need a 1.25 and youre running a 1.5 etc. +1.
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Taps
Apr 26, 2019 9:08:08 GMT 1
Post by cb250g5 on Apr 26, 2019 9:08:08 GMT 1
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Taps
Apr 26, 2019 14:28:57 GMT 1
via mobile
stusco likes this
Post by doohanno1 on Apr 26, 2019 14:28:57 GMT 1
Thanks for the replies lads.. Stupid me " presumed " that all diameter sizes in the set would have the same pitch size... Up to 10 mm = 1.0 pitch. 10 mm = 1.25. 12 mm = 1.75.
So as stated i will have to purchase seperate larger size ones..
Shurley my set should be labeled " fine and not so fine "..😉
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Post by doohanno1 on Apr 26, 2019 16:21:00 GMT 1
I'm just back from my local tool shop where the man behind the counter with the balaclava asked me for 54 euro for two taps , a stater and second... I hope he heard me say no as i ran out... I must say they looked and felt like quality kit compared to me oul Draper stuff...but still..
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Post by JonW on Apr 27, 2019 0:27:00 GMT 1
Depends on how many holes you need to clean up, but (and I'll get flamed for this for sure, but..) ebay often has Chinese taps cheap as chips that will do what you need.
Obviously if you were doing lots of holes in hard materials I would advise you paying the 54 Euros, but to clean up some threads the cheapies will be fine. The other side of the coin is that I bought a bunch of large taps 20years ago and used infrequently and looked after they are still in great condition and will see me out...
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Taps
Apr 27, 2019 0:49:41 GMT 1
Post by oldbritguy on Apr 27, 2019 0:49:41 GMT 1
Good quality HSS taps and dies are expensive but you get what you pay for! Good carbon steel taps will suffice DIY users cutting into ally, mild steel or soft alloys whereas HSS will do everything and last much longer too if used properly. Don't forget to use a cutting fluid even when chasing threads as well as cutting new ones. Prolongs the life of the tap and improves the cut. I don't know where you are located but I use these guys for all my cutting tool needs www.tracytools.com/They are based in UK but ship worldwide. As jonw says, ebay is a great source too. I would also suggest getting a set of thread gauges, like small feeler blades with teeth. These are individually etched with numbers which match the thread profile on each one. They will prove invaluable when replacing fasteners or purchasing taps in the future
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Post by steven on Apr 27, 2019 7:26:27 GMT 1
Thanks for the replies lads.. Stupid me " presumed " that all diameter sizes in the set would have the same pitch size... Up to 10 mm = 1.0 pitch. 10 mm = 1.25. 12 mm = 1.75. So as stated i will have to purchase seperate larger size ones.. Shurley my set should be labeled " fine and not so fine "..😉 Hi, The majority of threads on our LC,s are METRIC COURSE, and some are METRIC FINE, like the tie bar bolts on the arse of the engine, footrest hangers, caliper mountings etc, etc. The line of thinking being that a fine thread is a better locking thread than a course thread. There are plenty thread charts online, or get hold of a ZEUS book. Just to throw more confusion into the mix, our LC,s use JIS fixings as opposed to DIN. Thats why we find some M10 fixings with 14mm A/F heads or M8 fixings with M12 A/F heads etc. As someone said, cheap taps are available, and do have their place, like cleaning up existing threads in alloy or something like that. But be aware that it is a MUCH easier to break a cheap/nasty tap in a hole than it would be with a quality HSS tap, then of course you have to get the broken bit back out the hole.....which can be a pain in the hoop ! Steven. gcodetutor.com/machinists-handbook/tap-drill-charts.htmlwww.knucklebusterinc.com/features/2011/07/05/machinist-101-data-charts-reference-tables/
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Taps
Apr 27, 2019 7:45:51 GMT 1
Post by jon on Apr 27, 2019 7:45:51 GMT 1
You can get HSS taps for way less than €54 for two.
Besides I’d suggest you maybe only need the plug and not the second for cleaning up existing holes, unless the thread is damaged.
Jon
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Taps
Apr 27, 2019 7:53:11 GMT 1
Post by steven on Apr 27, 2019 7:53:11 GMT 1
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Taps
Apr 27, 2019 13:36:09 GMT 1
via mobile
Post by doohanno1 on Apr 27, 2019 13:36:09 GMT 1
Thanks again for all the info.. Some food for thought there alright..
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