Questions tagged [threads]
77 questions
5
votes
2 answers
What does "28" and "27" mean on my metric thread pitch gauge?
I have a metric thread pitch gauge that came in a tap and die set, it has pitches like $0.75$, $0.8$, $1.25$, etc. which is the distance between each thread. However there are two gauges that say $27$ and $28$ - I thought maybe it means $0.28\text{…
jhabbott
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2
votes
1 answer
making a leak proof thread for my keychain idea
I have been designing a prototype for a keychain that sprays perfume. I have a metal keychain piece which has a female thread and the plastic sprayer screws right into it and has a male thread.
I want to get these manufacturers ASAP but I need to be…
nicole1020
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1
vote
0 answers
Does the coating(tin/ticn)on forming taps increase their ability to work on harder material
I understand that the coating(Tin,Ticn),on forming/cutting taps,drilling bits etc,makes them last longer,run cooler,drill smoother.
But does the coating on them increase their ability to work on harder material compare to the same one but with no…
Dan
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1
vote
1 answer
threading a compression clamp
I'm not an engineer, just a novice hobbyist, so I'm not sure my terminology "compression clamp" is correct, but I'm attaching a drawing showing what I'm trying to accomplish.
This plate will be placed over two rods and then "screwed (partly) shut"…
Tim
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0
votes
2 answers
What is the correct drilling screw diameter for worn bore thread?
What size of drilling screw diameter do I need for
a worn bore thread? (In my case, it is related to eyeglasses.)
The original screw thread diameter is 1.4mm, but since the bore thread is worn,
I need to use a drilling screw that, I assume, should…
Dan
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0
votes
0 answers
Are there conventions for clearance in Whitworth thread forms?
Are there are any conventions for the clearance between the internal and external threads of BSW and BSF threads, or other threads using the Whitworth thread form?
Is the clearance achieved by modifying the thread diameter but not the thread form?…
William
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0
votes
1 answer
What is the contact area between threads and how does it change?
"https://www.youtube.com/watch?v=3l6EcBg9EPA" [@24:30 - 25:10] He says something about the load of a threaded interface being on only one small part of the spiral. To me this seems a bit odd right?
How much contact area is there really between a…
Xenox
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0
votes
2 answers
What is the justification for left-hand threads?
I'm familiar with left hand threads on bicycle pedals. The action of pedaling for that side of the bike would un-thread a right-hand threaded pedal, although some people have hacked a solution.
I have a chain saw that uses a left hand threaded axle…
fred_dot_u
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