The Metalworking Thread

[Partner]

The only time I saw clutch shoes were worn down to the spring, but I replaced a lot of overheated springs because not everyone likes the way the chain rotates at idle.

 

[Squareground3691]

If it works, go for it.

I have junked a couple clutches & drums that were fried on used saw purchases.
Although, saws that clutches can still be had new.

Yup , it works well. factory fresh,

 

[Squareground3691]

One big chunk of carbide, 2.5” at top and 1 “at bottom, 1.25 “ shank , will become a turbine blade cutter when finished,

 

[Wilhelm]

One big chunk of carbide, 2.5” at top and 1 “at bottom, 1.25 “ shank , will become a turbine blade cutter when finished,View attachment 442253

That is one expensive piece of hardware!!!
Looks beautiful too.

 

[Squareground3691]

Yes it’s only half way done , and very expensive, lol

 

[Wilhelm]

Yes it’s only half way done , and very expensive, lol

Sooo, it is only half price now instead later when it's all done?!

 

[Partner]

What could this be for? 1" outside and mt2 cone inside

 

[davidwyby]

 

[Wilhelm]

Tool deflection can be a bitc# to work with/against!

12.9 grade bolt steel is some serious stuff!

Solid carbide tooling is not indestructible!

 

[davidwyby]

Fix it all

 

[Ketchup]

View attachment 442718View attachment 442719

That second one’s a banger.

 

[Ketchup]

 

[Partner]

At least no one will steal it

 

[Wilhelm]

Does this count as metal working?

30+ year old hatchet, sharpening through grinding removed a lot of metal over the decades.
This is my attempt to restore at least some of the blades life.
That is a 12.9 grade M20 bolt piece.
Flux wire welded, cheap supermarket welder - truth be told it came out better than I expected.

I am in the process of grinding off all the excess steel with my 9" angle grinder.





If this works out I will have restored about an 1/2" of blade.

 

[Al Smith]

If I'm not mistaken 12.9 metric is about the same as SAE grade 8 . You cut cut it with carbide and often with ceramic tooling but it's tough stuff .I've seen extremely hard steel cut with carbide,the metal and the tool glows cherry red even with coolant .Camshaft lobes before they were finished ground .

 

[Wilhelm]

If I'm not mistaken 12.9 metric is about the same as SAE grade 8 . You cut cut it with carbide and often with ceramic tooling but it's tough stuff .I've seen extremely hard steel cut with carbide,the metal and the tool glows cherry red even with coolant .Camshaft lobes before they were finished ground .

SAE Grade to is "about" ISO 10.9 grade
To my understanding there is no SAE "bolt" grade that matches ISO 12.9!
See my signature.

And there is such a thing as ISO 14.9 grade for special applications to boot.

I am making custom chainsaw tools out of 12.9 grade bolts, I process them with Solid-Carbide drill & mill bits.
Even with maxed out liquid cooling and very conservative tooling parameters the mill bits take a beating and dull fast.

I am impressed with 12.9 grade steel properties, I love this stuff being a metal worker by trade!

 

[Wilhelm]

ISO vs SAE bolt grade chart

 

[Squareground3691]

SAE Grade to is "about" ISO 10.9 grade
To my understanding there is no SAE "bolt" grade that matches ISO 12.9!
See my signature.

And there is such a thing as ISO 14.9 grade for special applications to boot.

I am making custom chainsaw tools out of 12.9 grade bolts, I process them with Solid-Carbide drill & mill bits.
Even with maxed out liquid cooling and very conservative tooling parameters the mill bits take a beating and dull fast.

I am impressed with 12.9 grade steel properties, I love this stuff being a metal worker by trade!

What’s the RC scale on those bolts ?

 

[Wilhelm]

What’s the RC scale on those bolts ?

If RC is the same as HRC, according to Google:



Although Wikipedia & Google say that 12.9 grade bolts can be tempered making their outer surface much harder, and I can say I have had noticeable tooling wear differences between different brand bolts.

 

[Squareground3691]

If RC is the same as HRC, according to Google:

View attachment 447835

Although Wikipedia & Google say that 12.9 grade bolts can be tempered making their outer surface much harder, and I can say I have had noticeable tooling wear differences between different brand bolts.

Grade 8 is the same RC scale as 12.9