Thoughts on damaged thread

[grim_d]

That thread is galled and it has picked up and seized. I would say dirt ingress too. Very common on stainless steel fasteners if you are not careful.

It sure has, I find it extremely hard to believe that of all the machines with ER collets in this workshop that the one that only deals with wood, and is in a separate "clean" room is the only one that would have an issue with "dirt" ingress...plus I'd have felt it when I was putting it on.

Metric conduit thread; so, quick and simple to fix.

Yep, I'll be getting a die but I still want a replacement!

I had this happen on a Chinese spindle routing wood. Throw it away and replaced it.

Clean threads, no dirt, just one day galled so badly the collet could not be removed.

I run three Chinese spindles daily for 7+ years and it’s happen once.

So reading between the lines, of the 4 machines mentioned in this thread this has happened to 50% of them.

I think it's fair that it's replaced under warranty...since its happened under warranty.

If it was dirt I'd have felt it going on.

If you strip the spindle out .
Chase the thread on a lathe .
(i would happily sort it out for you )

Thanks for the offer John but it's not something I'd be up for dismantling for what they cost particularly when a die will sort it.....I've also got my own Harrison.

 

[grim_d]

Looks like a poor choice of materials. how bad is the nut? Seems odd it hasn’t damaged the entire spindle thread, unless the nut isn’t too badly damaged?
This could be foreign material ingress into the threads, but it could also be they’ve used incompatible materials between the nut and the spindle and due to a lack of lubricant it’s allowed galling between the two.

Nut is pumped. it's in 3 bits after I cut it off.

 

[MattF]

Thoughts?

If it was I, I'd be badgering the manufacturer or seller something rotten, on principle alone. If you've looked after it, & that's happened, I know I personally would be well peeved, in that situation.

 

[grim_d]

If it was I, I'd be badgering the manufacturer or seller something rotten, on principle alone. If you've looked after it, & that's happened, I know I personally would be well peeved, in that situation.

I am peeved. And I have looked after it...it's the most expensive thing I've ever bought apart from my house!

There are issues with the machine that have yet to be rectified under warranty from a year ago....all from a company with "first class service"

 

[mtt.tr]

how much thread engagement do you have?

Thread file or a ground hacksaw blade (its ugly but it works)

 

[grim_d]

how much thread engagement do you have?

Thread file or a ground hacksaw blade (its ugly but it works)

Yes yes, we know.

Thats not the issue...Yadda Yadda...

 

[mtt.tr]

Yes yes, we know.

Thats not the issue...Yadda Yadda...

I got the impression you was unsure which i doubted.

Its **** and does happen, ive had it with a handheld router before

 

[Cato]

Is it possible that the nut was crushed slightly out of round part way up? A thin spanner for example? It wouldn't take much to make it pick up on a dry thread, and once nipping at that point it's away.

 

[8ob]

Either way @grim_d has done a great job of removing the nut without causing more damage, if the conduit die can get that thread back into shape it should be ok in service. Knowing what caused the problem helps and with luck it wont happen again.

Bob

 

[Cato]

Either way @grim_d has done a great job of removing the nut without causing more damage, if the conduit die can get that thread back into shape it should be ok in service. Knowing what caused the problem helps and with luck it wont happen again.

Bob

Getting an answer, or at least a likely possibility for the cause will also help with that irritating 'itch' from not knowing why. Most on this forum will be the type who need to know, nature of the beast for those interested in the sort of stuff covered on the forum I guess.

 

[addjunkie]

Getting an answer, or at least a likely possibility for the cause will also help with that irritating 'itch' from not knowing why. Most on this forum will be the type who need to know, nature of the beast for those interested in the sort of stuff covered on the forum I guess.

But in reality you may know potential causes but will never know exactly which it was.

A dry thread always has potential to gaul, especially stainless. Im a fan of lubricated threads.

 

[Cato]

But in reality you may know potential causes but will never know exactly which it was.

A dry thread always has potential to gaul, especially stainless. Im a fan of lubricated threads.

No, absolutely right. It's more a case of having one, or some, likely causes to satisfy curiosity as opposed to the 'sh1t happens, buy a new one' approach. For me anyway.

 

[grim_d]

Is it possible that the nut was crushed slightly out of round part way up? A thin spanner for example? It wouldn't take much to make it pick up on a dry thread, and once nipping at that point it's away.

Not likely, the hex on the nut is on the unthreaded section...I'm also not that brutal with it.

Either way @grim_d has done a great job of removing the nut without causing more damage, if the conduit die can get that thread back into shape it should be ok in service. Knowing what caused the problem helps and with luck it wont happen again.

Bob

I'm sure a die will sort it but I'll be getting a replacement and keeping this as a spare now, it's not worth the downtime to risk it.

But in reality you may know potential causes but will never know exactly which it was.

A dry thread always has potential to gaul, especially stainless. Im a fan of lubricated threads.

Well formed threads in non-stainless (or other likely to gall combinations) in what should be a grade other than cheese shouldn't gall (I'm not saying it never happens) through normal service though, particularly in an application where it is intended to be removed and refitted regularly, dry or otherwise.

This is why I feel it's a defect in manufacture, wether that be by design or material defect.

Convenient how the warranty doesn't cover the threaded end of the spindle, regardless of the type of damage.

The threads here were (at one point) dry lubed with PTFE spray, a wet lube would just turn Into a slurry with the fine MDF dust and contaminate my collets etc.

 

[Screwdriver]

I would take a very sharp, very strong, hard pick and see if I could pry out the excess. Might just be aluminium stuck in the thread.

<edit> PS having done this a few times, you have to push really hard, the thread needs to be made immovable and you have to mind your fingers!

 

[grim_d]

After much back and forth I have finally managed to get them to agree to replace the spindle under warranty.

I was prepared to pay 50% of the cost if they extended my warranty....nope ....speaks volumes if you ask me.

I would take a very sharp, very strong, hard pick and see if I could pry out the excess. Might just be aluminium stuck in the thread.

<edit> PS having done this a few times, you have to push really hard, the thread needs to be made immovable and you have to mind your fingers!

It's definitely not aluminium, you can see where it's started tearing the root of the thread from the parent material. Have a die arriving tomorrow to clean it up.

 

[MattF]

Good to hear.

 

[James1979]

After much back and forth I have finally managed to get them to agree to replace the spindle under warranty.

I was prepared to pay 50% of the cost if they extended my warranty....nope ....speaks volumes if you ask me.




It's definitely not aluminium, you can see where it's started tearing the root of the thread from the parent material. Have a die arriving tomorrow to clean it up.

glad you’re sorted but not great service

 

[grim_d]

glad you’re sorted but not great service

This is only the tip of the iceberg when it comes to their lack of service. The one shot oil pump hasn't worked right since day one....

Finally a fairish outcome. Are they going to supply new nuts as well?

Spindle should come with a nut.

 

[grim_d]

Well new spindle arrived, installed it, checked runout....6 times more runout than the old one..

 

[roofman]

Well new spindle arrived, installed it, checked runout....6 times more runout than the old one..