Bunch of random pics of cutters

[Wilhelm]

You sharpen that?

Yes, freehand on a bench grinder.
Didn't even dress the wheel.
1/2" HSS-Co drill bit.

Do You think it'll cut?

 

[jakethesnake]

Yes, freehand on a bench grinder.
Didn't even dress the wheel.
1/2" HSS-Co drill bit.

Do You think it'll cut?

Yes. I think it’ll cut. I’m pretty darn sure it will. I need a full explanation on the how. I can sharpen one to get by. But I screw up several times.

 

[Squareground3691]

Yes. I think it’ll cut. I’m pretty darn sure it will. I need a full explanation on the how. I can sharpen one to get by. But I screw up several times.

The big drills are ezy , when you need to sharpen a .063 by hand then you’re taking, but you do it for a few decades like Wilhelm and I it becomes second nature,I usually use carbide in my work, it sharpens ezy’er in my opinion, biggest issue people have is getting correct radial relief, angle, clearances,

 

[Wilhelm]

Yes. I think it’ll cut. I’m pretty darn sure it will. I need a full explanation on the how. I can sharpen one to get by. But I screw up several times.

Are You providing drinks & food if I come by to teach You "the how"?

The big drills are ezy , when you need to sharpen a .063 by hand then you’re taking, but you do it for a few decades like Wilhelm and I it becomes second nature,I usually use carbide in my work, it sharpens ezy’er in my opinion, biggest issue people have is getting correct radial relief, angle, clearances,

Yeah, I have been at this game way too long, nearing full 3 decades.
But, I love grinding/sharpening drill bits.
The smallest OD I ever ground is 1.0mm and the coworker I sharpened it for made a point to come back and tell me that the bit performed very well.

To me grinding drill bits is what for some of You is grinding/filing chainsaw chains square - second nature!

 

[Squareground3691]

Are You providing drinks & food if I come by to teach You "the how"?


Yeah, I have been at this game way too long, nearing full 3 decades.
But, I love grinding/sharpening drill bits.
The smallest OD I ever ground is 1.0mm and the coworker I sharpened it for made a point to come back and tell me that the bit performed very well.

To me grinding drill bits is what for some of You is grinding/filing chainsaw chains square - second nature!

I’m in my 4th decade buddy, The money to good to stop ,

 

[Wilhelm]

I’m in my 4th decade buddy, The money to good to stop ,

I am glad for You!

My $$$ is not good, never has been.
Getting worse too.

 

[jakethesnake]

Are You providing drinks & food if I come by to teach You "the how"?


Yeah, I have been at this game way too long, nearing full 3 decades.
But, I love grinding/sharpening drill bits.
The smallest OD I ever ground is 1.0mm and the coworker I sharpened it for made a point to come back and tell me that the bit performed very well.

To me grinding drill bits is what for some of You is grinding/filing chainsaw chains square - second nature!

Absolutely! We will eat and drink like kings

 

[Squareground3691]

I am glad for You!

My $$$ is not good, never has been.
Getting worse too.

Sorry to hear that my friend, It’s not fair, you’re a talented guy ,

 

[Squish9]

2 chains - 20LGX and 20LPX(bumper link) both straight off the roll. Both rolls made in the same year

Why are the cutters longer on LPX? Is this common? I have never had both side by side before

 

[davidwyby]

@Squish9 and @rogue60 would y'all throw up pics of your preferred semi chisel/404 cutter profiles?

Thanks

 

[el33t]

2 chains - 20LGX and 20LPX(bumper link) both straight off the roll. Both rolls made in the same year

Why are the cutters longer on LPX? Is this common? I have never had both side by side before

View attachment 449987

It's probably by design as the cutter links part numbers are different (P35745/6 vs. P616222/3). On the other hand they share tie-straps and drive links.

 

[Squish9]

@Squish9 and @rogue60 would y'all throw up pics of your preferred semi chisel/404 cutter profiles?

Thanks

I don't have any pics on my phone so it will have to wait till the weekend. The good news is for the most part semi doesn't really care how it's sharpened. Just about anything will work to a degree.

27X now comes with a weird looking hexa type grind at 65 degrees. It works ok like that and works 30/85/60 as well

It's probably by design as the cutter links part numbers are different (P35745/6 vs. P616222/3). On the other hand they share tie-straps and drive links.

View attachment 450090

I did not not this. I always thought it was the same chain just with the humped drive link. I wonder why it's different?

The 70 series LGX is really hard to find here but I wonder if it's different to the LPX as well in 3/8?

 

[el33t]

I did not not this. I always thought it was the same chain just with the humped drive link. I wonder why it's different?

The 70 series LGX is really hard to find here but I wonder if it's different to the LPX as well in 3/8?

It may be a similar story with these, as the part numbers are also different. If the cutter teeth other than length (and height) when new, are not different, then perhaps it is a matter of limiting the kickback angle to some accepted level by lowering the maximum height of the teeth, due to the lack of bumper drive links in LGX. (Probably not true...)
Stihl uses the same cutter links.

 

[Squish9]

Here is some more of the 20 LGX and LPX.

The overall depth gauge shape and size on the LGX compared to the gauge+ humped link on the LPX. What's the bet on how they cut compared to each other? I have mostly used the LPX in the past and my best guess is they cut exactly the same

 

[el33t]

Here is some more of the 20 LGX and LPX.

The overall depth gauge shape and size on the LGX compared to the gauge+ humped link on the LPX. What's the bet on how they cut compared to each other? I have mostly used the LPX in the past and my best guess is they cut exactly the same

View attachment 450294
View attachment 450295

So it looks to me LGX uses a longer ramped depth gauge to reduce kickback. Consequently, the depth gauge end is a little bit closer to the heel than in the LPX. This makes the top plate shorter to provide a similar space between them (gullet).
Anyway, both types of chains are not of the “low kickback” type (yellow color in the US).
Arguably, the differences between the two in cutting speed may be more noticeable with boring.

 

[Nighthunter]

All done freehand and by feel in the field using no guides or depth gauge, no expert in anymeans, just sharp enough for me

 

[Squareground3691]

All done freehand and by feel in the field using no guides or depth gauge, no expert in anymeans, just sharp enough for meView attachment 450359View attachment 450360

She’ll make some chips ,

 

[Nighthunter]

She’ll make some chips ,

Some fresh oak noodles from it

 

[Squish9]

So it looks to me LGX uses a longer ramped depth gauge to reduce kickback. Consequently, the depth gauge end is a little bit closer to the heel than in the LPX. This makes the top plate shorter to provide a similar space between them (gullet).
Anyway, both types of chains are not of the “low kickback” type (yellow color in the US).
Arguably, the differences between the two in cutting speed may be more noticeable with boring.

Dam it. I always thought the LPX was a green chain now I see it's only the BPX semi that gets the kickback rating.

I wanted 2 of the chains as close as possible, one with the rating the other without. Now I need to find something else

Only close things I have is 23RMP (yellow?) and SP33G (green)

 

[el33t]

Dam it. I always thought the LPX was a green chain now I see it's only the BPX semi that gets the kickback rating.

I wanted 2 of the chains as close as possible, one with the rating the other without. Now I need to find something else

Only close things I have is 23RMP (yellow?) and SP33G (green)

23RM (3693) is yellow, but 23RM3 (3695) is green. 23RS3 (3694) is green too.
Of course, you probably have your reasons that you need these 2 types, but the classification is conventional.
If you use a chainsaw with enough power, any chain becomes "yellow".
Nowadays, the tests are done on a test bench powered by an electric motor, but here is the data of a gas/petrol chainsaw that was used for the evaluation of .325 chains.