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Using forming tap to reform eyeglasses female thread

The 1.4mm bore thread of an eyeglasses worn-out,so the screw get loose after some time.I would like to use 1.5mm screw(instead of the original 1.4mm)to fix the problem. Can i use 1.5mm forming tap(...
Dan's user avatar
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1 vote
0 answers
52 views

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 ...
Dan's user avatar
  • 15
0 votes
2 answers
152 views

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 ...
Dan's user avatar
  • 15
0 votes
0 answers
21 views

Shaft Nominal Diameter for M16 thread

I am looking to machine a M16 thread with a pitch of 2mm on a shaft, but I am unsure about what diameter should that shaft be in order to achieve the desired M16 thread. Does this change depending on ...
Marco Luís's user avatar
0 votes
3 answers
67 views

Ideal way to create internal thread for 3d prints

I created a two piece case for an electronics project. The pieces are joined with M3 screws. The screw enters a 3d printed cylinder. In order for the screw to secure itself, it connects to a nut I ...
user1584421's user avatar
0 votes
1 answer
106 views

Figuring out thread (neck finish) for bottle cap

I've done a fairly large amount of googling on two different occasions trying to figure out what neck finish I have on a particular bottle thread I have here. I'm in europe and this is for a plastic ...
TrisT's user avatar
  • 99
0 votes
1 answer
58 views

How to Calculate Maximum Safe Load for M6 Thread in .118in Steel

I am working on a project designing a pendent speaker. The speaker will be housed in a steel ball and suspended from the ceiling using an M6 eyebolt component. The overall weight to be suspended will ...
Emmett Palaima's user avatar
0 votes
2 answers
76 views

Reverse engineering a thread

I have a thread in an actual product, that I want to replicate in a 3d print. I have no clue on what to measure, and how to replicate it. This is the thread: One possible solution is this: I have an <...
user1584421's user avatar
0 votes
0 answers
21 views

Straight Thread Seal Performance

Is it possible for straight threads to create a hydraulic/mechanical seal without the use of o-rings or sealants? From what I've read, in the oil industry buttress threads are used, in my application ...
Danielle's user avatar
0 votes
0 answers
441 views

What grease / lubricant to use on aluminum threads?

I have a coffee grinder with fine aluminum threading as adjustment mechanism. (The rotation is also done while under springs load). The threading is of a 10cm diameter. I had to clean the threads ...
Yonika's user avatar
  • 1
0 votes
0 answers
22 views

Locating an equivalent clamp

I am looking to locate an equivalent part similar to the one pictured below which I came across. I think it must be a bespoke piece for this particular item. It is essentially a saddle clamp which has ...
AWGIS's user avatar
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0 votes
1 answer
343 views

What is percent of thread depth when it comes to screws?

What, geometrically, is meant by percent thread depth? And, what would constitute 100% thread depth? I have been trying to derive the equation for thread percentage in the textbook Machine Tool ...
skale's user avatar
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0 votes
1 answer
73 views

What is difference between two Thread Forming Taps?

What is difference between Thread Forming Taps: 1/4-20 UNC GH6 and 1/4-20 UNC-2B HSS Right Hand Taps?
Lexx Luxx's user avatar
  • 111
0 votes
1 answer
95 views

Watches: screw-down crown, gaskets, and what else?

I recently learned that some watches have a "screw-down crown", which to my understanding is made with a threaded crown stem that tightens into a threaded watch case. This seems ...
H2ONaCl's user avatar
  • 109
0 votes
1 answer
105 views

Can you explain mathematical and mechanics formulation of equation in Junker 1969 paper on self-loosening of fastener by vibration?

Can you help me to understand how the first equation in the paper 'New Criteria for Self-Loosening of Fasteners Under Vibration' by GH Junker, 1969 is derived? I'm not able to understand the ...
Khushal Badhan's user avatar
1 vote
1 answer
293 views

How can high-precision screw threads be made on a lathe using a less-precise leadscrew?

Motivation I am interested in how high-precision screw threads can be made from lower precision parts. As I understand it, one can make threads on a lathe in the following way: The workpiece is ...
statusfailed's user avatar
0 votes
2 answers
828 views

Pull out force for a 5/8" tapped bolt

I am looking for the pull out force on a 5/8" bolt tapped into 1/4" thick tube steel. Does the thickness of the steel need to match or be greater then the bolt diameter?
mark's user avatar
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0 votes
3 answers
364 views

Is it possible to tap a hole partially through a 3mm aluminium sheet?

I would like to secure components to an aluminium sheet that is 3mm thick. Ideally I do not want to drill holes all the way through the sheet because it is important that a seal is maintained. I am ...
Pyy's user avatar
  • 103
0 votes
0 answers
37 views

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 ...
William's user avatar
  • 166
0 votes
1 answer
220 views

Unable to understand minimum length of engagement for bolts

I've attached a snap of the part I'm unable to understand Machinery's Handbook 29th Edition. Here's a link to the ebook as well https://www.vtc1.org/cms/lib/PA03000913/Centricity/Domain/21/Machinerys%...
Wren's user avatar
  • 37
2 votes
1 answer
226 views

Aluminium Bolt in Titanium Casing: Any Dangers of (Contact-)Corrosion?

Assumed we have a fuel flask that is made of titanium. The bottle will be filled with white gasoline when used. At the bottleneck there is a standardized thread manufactured into the titanium. Are ...
Dave's user avatar
  • 145
-1 votes
1 answer
63 views

Safety of fiberglass, cloth

Is there a way to make fiberglass so safe that it can be used for everyday clothes? From what I've found glass fibers are itchy when thick, so reducing their diameter helps make them soft on touch. ...
Surprised Seagull's user avatar
1 vote
3 answers
546 views

Does lead screw's thread have to be trapezoidal?

I want to move a small tool table/bed linearly, so I'm designing its mechanism. Fairly simple, it's going to have 2 rails and a lead screw. Browsing the web I find that locally the shortest ...
php_nub_qq's user avatar
0 votes
0 answers
1k views

Maximum strength size thread for aluminium sheet per thickness

Is there a rule of thumb, or a table which helps one determine what is the maximum strength thread size to use for aluminium sheet? I am interested in threading 3mm, and 2mm thick sheet aluminium. I ...
run_the_race's user avatar
2 votes
3 answers
950 views

Bi-directional gearbox

I want to design and create a gearbox that allows an input shaft to be continuously rotating in one direction, while the output shaft rotates one full turn in the same direction but then half a turn ...
Billy 's user avatar
  • 43
0 votes
1 answer
728 views

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 ...
Xenox's user avatar
  • 103
0 votes
2 answers
507 views

Securing aluminum angle to steel tubing without through-bolts

Overview I'm planning a rack for solar panels on the roof of a cargo trailer. I will mount the panels to a pair of 15 series 80/20 aluminum extrusion rails. I will mount the rails to the roof of the ...
rmaddy's user avatar
  • 103
0 votes
2 answers
53 views

Using a Threaded Rod and Internally Threaded Tube as a Piston Pump

Im looking for a low cost, high pressure pump with good flow/pressure control for an espresso machine (a lot to ask, I know). My first thought was using a screw-driven piston. This will work, but Im ...
Brian Collins's user avatar
1 vote
5 answers
11k views

Why do you need helicoil if you can just use a tap?

I'm new to thread repairs and I was just wondering when using a helicoil, why does the helicoil need to be inserted if you have already tapped the new threads into a hole? Can't you just put a bolt in ...
TMax's user avatar
  • 11
0 votes
1 answer
143 views

What is the correct method to remove or tighten this splined "nut"?

This photo shows the input shaft of an air compressor head. The splined cog-looking disc around the shaft is actually a sort of threaded nut which screws into the larger disc around it. It serves to ...
StayOnTarget's user avatar
1 vote
3 answers
2k views

How do british standard pipe parallel (BSPP) (G) threads seal?

I realize that there must be some sort of o-ring, gasket, or washer, but from an engineering standpoint it is not clear how to know what fitting will seal to what without having the parts in front of ...
ericnutsch's user avatar
  • 8,106
2 votes
2 answers
9k views

M# Screw mm per turn?

So is there a standard rule of thumb, or equation about the distance the end of a screw will travel per rotation? Conversely, how many turns it will take to travel a specific distance? Say I have an ...
Bob R's user avatar
  • 121
1 vote
0 answers
45 views

How to repair stripped, leaky pneumatic fitting?

I have a pneumatic cylinder with a stripped fitting, which causes a slow leak. I took it to a machine shop and he tried to re-thread it but there wasn't enough good metal left to get a good thread. He ...
Jon Vote's user avatar
  • 111
0 votes
1 answer
177 views

how does this z-axis micro-adjust lead-screw design work

The picture (which I found on the web without any accompanying explanatory text) shows a home-made z-axis micro-adjust lead-screw add-on to the vertical milling attachment of a vintage hobbyist lathe. ...
Tim's user avatar
  • 225
1 vote
1 answer
82 views

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 ...
Tim's user avatar
  • 225
0 votes
0 answers
35 views

M thread as leadscrew

Hello I was searching net but can find information. I am doing a hobbyist project. I would like use shaft with metric triangular thread as a leadscrew. Can I do that? I know ACME will be loads better ...
Jakub Rogacz's user avatar
6 votes
7 answers
7k views

Fixing a blind bolt hole when the first 2-3 threads are ruined?

One of my suspension bolts came undone while I was mountain biking recently, sadly I didn't notice. I landed a big drop with only 2-3 threads left engaged, and unsurprisingly it's ruined them. The ...
Codemonkey's user avatar
0 votes
1 answer
84 views

identify shackle or swivel tensioner mechanism

What is this called? I would say it is a shackle or I suppose, a turnbuckle, but it appears to have a right threaded rod on both sides and right threaded free nuts inside. I would just say it's a ...
Andyz Smith's user avatar
0 votes
2 answers
143 views

Straight Pipe Thread

Is there any National Pipe Thread Straight (non-tapered, requires O-ring or compression olive) that is compatible, even loosely, with a machine thread threaded rod? I want to put a reducer on the end ...
Andyz Smith's user avatar
0 votes
1 answer
107 views

Is there a rule of thumb to construe a screw

When your first idea is drafted you calculate which forces/pressures and so on are working on your system. And then you break the forces down into the single screws which are built in your device. ...
tueftla's user avatar
  • 218
3 votes
0 answers
69 views

Thread identification

I am having a very difficult time identifying this thread. This part is a plug that I am trying to replace because the threads were stripped. The best fit for pitch is 11 threads per inch (imperial), ...
user8908459's user avatar
0 votes
0 answers
99 views

Screw Cap design for high pressure surge vessel

I'm designing a pressure vessel with a relatively large cap that provides access into the vessel, what recommended thread specifications is needed to maximized locking and safety against faliure or ...
TechDroid's user avatar
  • 203
0 votes
0 answers
50 views

Decision criterion if bolted joints are loaded concentrically or eccentrically

When dimensioning bolts I have to decide if the applied load is concentrically or eccentrically to the bolt axis (according to VDI 2230 but I think in other approaches too). But how do I decide and ...
tueftla's user avatar
  • 218
0 votes
0 answers
123 views

Calculating the lifting force $F_{Kab}$ with SolidWorks – according to VDI 2230

I’m not sure if my procedure to simulate the lifting force $F_{Kab}$ is correct. So I illustrate my way how to get the lifting force $F_{Kab}$ using SolidWorks and the simulation tool. I hope you can ...
tueftla's user avatar
  • 218
0 votes
1 answer
171 views

Tapped thread maximum load

I am building a stair from aluminium to go to my basement, the stair sides-plates are made from 10mm thick aluminium AWS 5454. I am planning to tap M10 thread into this plate. To avoid the step ...
Mech_Engineer's user avatar
1 vote
0 answers
264 views

Calculation of critical internal thread according to VDI 2230 Part 1

I’m doing a “Systematic calculation of highly stressed bolted joints – Joints with cylindrical bolt“ according to VDI 2230 Part 1. In step of calculation R11 “minimum length of engagement”, when my ...
tueftla's user avatar
  • 218
0 votes
2 answers
176 views

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 ...
fred_dot_u's user avatar
  • 7,097
5 votes
1 answer
2k views

How are non-continuous internal threads plastic injection molded?

I'm trying to figure out how the heck some of these plastic bottle caps are injection molded. By having the thread on the inside of a cap, this obviously creates an undercut. Now I've watched some ...
Davbog's user avatar
  • 363
1 vote
1 answer
95 views

What is this part called, and where could I get one?

I'm fairly illiterate when it comes to Engineering, so please understand I have pretty much 0 idea what I'm talking about. I'm having to build a seawater distillation device for school, and we ...
Zack's user avatar
  • 11
0 votes
1 answer
33 views

meaning of 1" baseplate fitting to mount to a standard 1" feedthrough port

I was looking at this page to figure out how I would install a manipulator onto my chamber. It says 1" baseplate fitting to mount to a standard 1" feedthrough port" So, I would have to have a ...
Blackwidow's user avatar