Reverse thread screws

Dont mind showing my ignorance but why would a left hand thread be manufactured?

some shafts come with "left hand" threads, simply to maintain a tight nut on it when it rotates, meaning if you hold the nut and rotate the shaft it will always tighten up, some adjuster screws are left handed and right handed threads on the same shaft in order compress or expand "something", some trucks have a lefthand thread on one side of the wheel studs and right hand on the other side, again so the basic rotation of the wheels being forward at most times assists in keeping them tight.......... some gas fittings are "left handed" to stop us screwing it in places where it should not be, oxy actelene have lh and rh threads so you cant mix em up, bike pedals are lh and rh so they always tighten up when riding....
If you think about it there are a lot of things around that have em
Noting that you can even buy "left handed" drill bits, the most common purpose is to drill out broken off bolts/studs as when it drills down and happens to loosen the bolt/stud it un-screws it at the same time, using a right handed one will tighten it and can make a small problem become big....
Hope that kinda explains it
Cheers
Joe

Big fish
Early model Valiants had left hand thread wheel studs on one side, can't remember which side.
Murray

Yep - reasonably common item, but mainly used in 'specialist' applications :
gas bottle threads, bicycle pedals, motors where cables are attached via yokes which may vibrate loose, turn-buckles which have both a LH and RH end. etc....

Generally would need to be 'manufactured' to an order ......... unless you can find some hidden on the WWW !!

Had occasion to get some LH nuts, years ago ...... had to call in a 'favour' to get them made.

Thanks folks...Now that you mention it I do remember the push bike pedals left hand thread... Been many a year since using one though!

LH threads on some early model econovan/mazda variants too.Driver's side wheels I think?????

If you find one braggy can you ask if they have any stripped paint in stock lol.

Right next to the long weight

spot on, bit more info from the poster as to the application.

"easy-out" is what you use after the hole is drilled, yep it is "left handed" and you can match it with a LH drill bit..
Cheers

2 inch with phillips head reverse, could be having a lend.

Don't forget the box of spot welds.

Al

I think I have one of those screws in my skull.

It is is there to hold my Bone Anchored Hearing Aid.

I wouldn't recommend the operation to anyone though,,, the skin graph didn't take very well and a blow fly laid eggs under the flap and My wife pulled out 33 maggots one day. LOL

What Boo Boo?

A......
"50mm/2 inch
8 gauge
reverse thread
Phillips head slot
self tapper"

That's one helluva hearing aid you got! LOL

Al ya bloody smart ass.

I heard you typing your response before I read it. LOL

Do you have the original screw? If so can you TIG weld the head of the screw then slot to suit a flat head screwdriver (left handed of course)

Craig

Hi Workhorse, so what brand of machine are we talking about here? Is it the "burr screw" you are after?doc.

I was going to suggest cutting a slot for a flat blade screwdriver, as well. It may not be necessary to TIG weld the head first, but welding up the damaged philips socket would probably be better.

glids

Cutting a slot for a flat blade screwdriver is good but sometimes difficult if the screw head is hardened. An alternative (if not a countersunk screw) is to grind a pair of flats on the sides of the screw head and use an appropriate wrench.

Hi Workhorse,

Why not just drop the screw into the inside and send it in for a warranty claim.
This way they can find that the screw came loose and damaged something inside.

Try and put some marks on the head of the screw to indicate it may have gotten mixed up with the workings.

Or have you made advances and informed them of your investigations in this regard.

Just a thought.

Cheers, Bruce

Remind me not to sell you anything with warranty cover Bruce!

Thanks Bruce.
I was trying to save the bloke money by removing the bean myself and ended up shooting myself in the foot.
Should follow the rule some people adhere to and not go out of my way to help anyone. (sic) Not suggesting you're suggesting that.

Hi Allan,
They should not have denied a warranty claim outright, they should have been more helpful. After all it is their reputation at stake. A simple examination of the item will more than likely point to the cause irrespective of a damaged screw head.


Workhorse,
Know what you mean about helping out and getting caught out. I have done that many times.

But it won't stop us from helping in the future will it.
We can't help it. It is in our nature.

Cheers, Bruce.

I've been emailing Australian distributors/suppliers, overseas manufacturers and 7 of the distributors of these machines in Australia.
I got one positive from a supplier of the same machine but not who I bought it from and he wanted to charge me $79 for one screw.
I'm at my wits end so that's why I posted it here on 4wd forum.

Can you get the thread out for a sample if so I could make you one also can you take a photo of the burr and email me i may be ableto do something
email kev dot h at bigpond dot com
Cheers Kev

Hey kev.h that's the best news I've heard for a while.
I can send you the screw if you want.
I'll email you.
Thanks,
Michael

Gday mate

Been pondering your post all day being a diesel mechanic for a large construction company I come across alot of weird and wonderful items but the only thing I can think of is the small screw inside the chuck on an electric drill I changed one today and it was a small left hand thread screw if thats not what your after try an electronics place or supplier not sure what state you in but try these places I have used here in WA for different bits n bobs. RS components, MM electrical ERW electrical maybe even jaycar. hope ive helped if ya need more info please ask.

Scott n Lara

Thanks Scott n Lara.
Sent off some emails and will call them tomorrow.
Grateful for the help.

Thanks again.

Hi Workhorse,

I know it's not the right thing to do but given the lack of assistance by the company you purchased from....

Could get someone to buy a new one the same as the original and return it shortly after for a refund due to a screw that was found to be missing... provided of course the missing screw fell out in an anti clockwise direction and therefor was not damaged in the process :)

Could then miraculously find a screw to put back in to your broken grinder to allow you to return it for the necessary warranty repair?

Cheers, good luck. db..