Fast Angles for round chain

[davidwyby]

Messing with the USG I got from @Armbru84 . made the safety chain that came on the 630 I got from @JohnnyBlade make the 630 look fast :-D

 

[Duce]

Windsor 58A chain, half worn, filed with an Archer FastFiler roller guide

Knotty turkey oak

Straight grain turkey oak

This chain is on its third tank of fuel and bucked up a whole giant dry wind blows oak including stumping the root ball off which caused some serious sparks.
I think it performs quite well still.

Chain rocking on bar? Looks like it is cutting concaved in wood.

 

[BlacknTan]

What I'm about to say here is purely the opinion of someone who has worked a lifetime in the metalworking industry.

I've been going back and forth about grinders for years, but never bit the hook. The USG looks about the highest quality unit to be had, to me. Honestly, maybe the Simington does the job, but the workmanship on that machine leaves me wanting more. Looks to be all thin, cheap castings... motor needs to be shimmed, stops loose as a Goose's stool. Dressers just seem to be clamped on the threads. I can't seem to warm up to it.

Still hashing out how much faster the Simington chain could be over something one could get off a USG.... and, if it's enough to be much of a difference to me?

 

[davidwyby]

I think you’re saying square vs round…if you are, and you can swing the $, go square. Faster and smoother.

 

[davidwyby]

I couldn't believe the smoothness with my 6100 (which is also smooth) even in nasty dry hardened aleppo pine. It doesn't even feel like a chainsaw.

 

[BlacknTan]

You have experience with the grinders and I don't, so my thoughts don't mean much. But, I just can't see where the difference in side plate angle, where the cutter only needs to shave a chip .030 thick, will make that great a difference. Now the top plate angle on square may last longer... that I can see. Smoother? Perhaps....
I need to be able to try properly ground square.

Do you have a square grinder, BTW?

 

[BlacknTan]

I think you’re saying square vs round…if you are, and you can swing the $, go square. Faster and smoother.

But also, you're in the metal fab business... I don't see a machined bearing surface on that Simington grinder?
And for those that own them and like them, just the words of someone who seeks proper fitment, over good enough..

 

[davidwyby]

I have a little experience with Kevin's tecomec and my USG. The USG is tighter even old and worn as it is, but the tecomec was faster and handier with the hydraulic clamp. I could go either way for round.
I watched @Armbru84 work his magic on my chain on Kevin's square grinder too. Seemed to work well, and the chain works very well.
I may eventually end up trying to get a deal on a square grinder, I gotta try my ATOP first.
You might see if Cole will do a chain for you to try. Or I can once I try my ATOP. I know guys who are good at grinding can grind a better/faster chain than stock/OEM.
You might check out some square grinding vids on youtube. Guilty of Treeson just did one.

 

[BlacknTan]

Yes, eventually I'll get there, David. Eventually..

I've watched a lot of square grind vids.. probably near all of them. I need to chew on things for awhile before my mind is made up.

Guilty of Treeson has some good videos..

What is sticking in my mind at the moment is the fact that I think a USG could duplicate X chain and EXL profiles, or even the new Stihl Hexa profile quite easily.

 

[Philbert]

Sounds like 2, separate issues: the geometry of the chain cutters, and the quality of the grinders commonly used to achieve them.

if you like the way that one cutter geometry cuts better than another, then you can start looking into different ways to achieve that desired shape.

Philbert

 

[davidwyby]

@species8472 did square on a usg I think

 

[BlacknTan]

What the USG would lack is a repeatable method of dressing the wheel.

And yes, Philbert.. in my mind, at least, there are two issues at stake here. As usual in life.. no perfect answer correct for everyone.

 

[Philbert]

@species8472 did square on a usg I think

There is a ‘unicorn’ square grind attachment for the USG grinder. I have seen the instructions, but never the actual attachment.

Philbert

 

[Wilhelm]

Chain rocking on bar? Looks like it is cutting concaved in wood.

My apologies, I don't understand Your question.
What do You mean by "cutting concaved"?
Those bucking cuts went straight down without any side slop.

The bar is brand new, though the chain is used - there should be next to no chain slop with this B&C setup.

 

[Duce]

My apologies, I don't understand Your question.
What do You mean by "cutting concaved"?
Those bucking cuts went straight down without any side slop.

The bar is brand new, though the chain is used - there should be next to no chain slop with this B&C setup.

No, my apologies! I was looking at @davidwyby video. That cookie he cut looks like it's concaved when it drops over.

 

[huskihl]

Yes, eventually I'll get there, David. Eventually..

I've watched a lot of square grind vids.. probably near all of them. I need to chew on things for awhile before my mind is made up.

Guilty of Treeson has some good videos..

What is sticking in my mind at the moment is the fact that I think a USG could duplicate X chain and EXL profiles, or even the new Stihl Hexa profile quite easily.

I can send a square ground chain back with your 576 if you like

 

[farminkarman]

I can send a square ground chain back with your 576 if you like

You might want to give him fair warning about the addictive nature of your square ground chains, lol.

 

[wcorey]

What the USG would lack is a repeatable method of dressing the wheel.

The USG square conversion kit has bolt on dressers and replaces the whole vice floorplate with one that pivots sideways.
What any chop saw/swinging wheel style round grinder lacks for doing square is the ability to move the chain cutter sideways into and back from the grinder wheel (or vise versa). There's just no way to do true square by swinging the wheel down into the cutter, at least with everything I've tried.

After years of not finding any sort of reasonable (read cheap, lol) deal on a square grinder, I was going to fab up a USG conversion but finally ended up doing a homemade RSII sort of clone.
Not a day after I cut my first chain on it, found a crazy deal on both a Prosharp AND an RSII.
Was both happy and a bit pissed at the same time.
That said, I much prefer my homemade one so wasn't a waste after all...

 

[JohnnyBlade]

Messing with the USG I got from @Armbru84 . made the safety chain that came on the 630 I got from @JohnnyBlade make the 630 look fast :-DView attachment 311366

Damn it man! I never got this alert. I was just reading the thread and seen muh name David do we have video of the 630 yet?

 

[davidwyby]

Damn it man! I never got this alert. I was just reading the thread and seen muh name David do we have video of the 630 yet?

Yeah some guy in a trashy looking back yard in the dark with a headlight on in shorts and flip flops, no shirt, and emulegs…or as I call them, skankles. - cutting silly small little 8” dia cookies.

I want a @huskihl chain toooooo…

@wcorey very interested in your home brew grinder.