Tapping a thread question.. - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 26 (permalink) Old Jan 22nd, 2007, 1:20 am Thread Starter
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Tapping a thread question..

well I took the rocker pin that I could barely get a 5mm bolt into(maybe 1-1 1/2 turns) and screwed a 5mm tap into it. I turned it maybe 5 or 6 at turns. After the first time I did it I tryed the 5mm bolt into it and not much difference. So I tryed again with the tap a few more turns than 5 or so. I took it back out but noticed a sliver of metal on the end. Almost like a thread came out with it. The 5mm bolt I can now get screwed in about 4-5 turns. So was that metal sliver that looked like a thread supposed to happen when you tap threads that are messed up? Or did I do something wrong and mess up threads and pull one of them out?

S

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post #2 of 26 (permalink) Old Jan 22nd, 2007, 3:27 am
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You might have just cut a little more thread in there. Sorry I couldn't make sense of the first bit of your post.

If you are tapping a thread it will create slivers of some type, cleaning shouldn't bring much out but as I said if you went deeper than the original it will produce more swarf.

Just re-read the post.. are you sure the thread pitch was the same as the bolt?

Mal

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post #3 of 26 (permalink) Old Jan 22nd, 2007, 8:14 am
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sounds like you did it just right. now you should be able to get the stuck rocker pin out, just make sure you thread the extractor bolt in all the way, and if it won't bottom out, get a longer one, then proceed extracting. be sure to lightly emory cloth the pin once removed and heavily grease it upon reinsertion.
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post #4 of 26 (permalink) Old Jan 22nd, 2007, 9:11 am Thread Starter
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Quote:
Originally Posted by onespeedpaul
sounds like you did it just right. now you should be able to get the stuck rocker pin out, just make sure you thread the extractor bolt in all the way, and if it won't bottom out, get a longer one, then proceed extracting. be sure to lightly emory cloth the pin once removed and heavily grease it upon reinsertion.
Actually I could get the rocker pin out in the first place. But just barely could get that bolt on it because it barely threaded. So I wanted to make it easier for next time.

Even after doing the tapping the bolt won't go in even further than 5 turns or so. But some of the others won't either. But at least now it will go in more than 2. I'm just curious did I do it right or screw it up?

S

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post #5 of 26 (permalink) Old Jan 22nd, 2007, 9:42 am
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Replace it I would not take the chance but that's just me.



Donít worry about the laws of physics, it will come fine you.

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post #6 of 26 (permalink) Old Jan 22nd, 2007, 10:40 am
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you did it right.

i mentioned the stuck rocker, because i recently had one stuck, and the slide-hammer tool only egaged 1-3 threads and ripped the threads of the screw. i chased the rocker pin threads, and got a longer screw for the slide hammer tool.
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post #7 of 26 (permalink) Old Jan 22nd, 2007, 11:20 am Thread Starter
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Quote:
Originally Posted by onespeedpaul
you did it right.

i mentioned the stuck rocker, because i recently had one stuck, and the slide-hammer tool only egaged 1-3 threads and ripped the threads of the screw. i chased the rocker pin threads, and got a longer screw for the slide hammer tool.
Does chasing mean tapping? Same thing? You needed the longer screw because the first few threads were dead. So basically what I did was tear into the metal fixing bad threads, not tear out good threads?

S

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post #8 of 26 (permalink) Old Jan 22nd, 2007, 5:38 pm
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Chasing and taping are to different things. Taping is creating new threads in a bare hole, chasing is just cleaning out the hole of crap(old loctite, mashed threads, broke threads etc.) you are chasing yours to fix the damage you did. Sounds like yes you just fixed the bad threads ... if the screw threads in nicely now then you did a good job. Be very careful with taps as they are very brittle and can break very easy, then they are almost impossible to get out. It is best to thread a screw into a good shaft first to see how deep the threads are and then mark the tap so you no not to go to far, then gently go 1/2 to 3/4 turn in then 1/4 back out over and over untill the threads are all better. Turning the tap back cleans the crap out of the taps cutters and helps prevent the tap from getting stuck or broken. Don't use cutting fluids or lubes for chasing threads as they tend to build up the crap and cause problems (stuck taps), fluids/lube are for cutting new threads.

Tap/chasing 101
Hope this wasn't overkill
JD

Last edited by 853MACHINE; Jan 22nd, 2007 at 5:43 pm.
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post #9 of 26 (permalink) Old Jan 22nd, 2007, 5:50 pm Thread Starter
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Quote:
Originally Posted by 853MACHINE
Chasing and taping are to different things. Taping is creating new threads in a bare hole, chasing is just cleaning out the hole of crap(old loctite, mashed threads, broke threads etc.) you are chasing yours to fix the damage you did. Sounds like yes you just fixed the bad threads ... if the screw threads in nicely now then you did a good job. Be very careful with taps as they are very brittle and can break very easy, then they are almost impossible to get out. It is best to thread a screw into a good shaft first to see how deep the threads are and then mark the tap so you no not to go to far, then gently go 1/2 to 3/4 turn in then 1/4 back out over and over untill the threads are all better. Turning the tap back cleans the crap out of the taps cutters and helps prevent the tap from getting stuck or broken. Don't use cutting fluids or lubes for chasing threads as they tend to build up the crap and cause problems (stuck taps), fluids/lube are for cutting new threads.

Tap/chasing 101
Hope this wasn't overkill
JD
Wow thanks. I didn't know all this. I did "chase" it as far as I could have. But really there is no need as I just needed to be able to screw a bolt in 4-5 turns good so that in the future someone won't have a problem. The guy who gave me this tap said use WD-40 to lube but he probably didn't know I was chasing. I didn't know about going in a little and backing out. But makes sense.

S

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1998 Aprilia RS250
1998 Honda RS125
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post #10 of 26 (permalink) Old Jan 22nd, 2007, 6:08 pm
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This is just from personal experiance building aircraft piston engines(15 yrs+), I'm sure there is someone that will disagree with what I've written.


Hope it does you good though.
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