Chain grinder..

[john87]

6 hours ago, doobin said:

As regards a machine not getting it as sharp as by hand- that simply isn't true, with the machine set up correctly and an operator who knows what they are doing!

 

It turns out that it's really hard to take a photo clearly showing a well sharpened chain, but I've tried. You can also see all the many angles of adjustment that a pro level grinder offers.

 

Re the 'burr' at the top- this is not an issue. It's simply the layer of chrome on top of the tooth peeling up as the hook (the inside top plate angle??) is set so fine. I've had conversations with 'old timers' in the pub who are incredibly proud of their worn file handle that they use to knock this bit off after sharpening to such a level by hand. This just does it a heck of a lot quicker.

 

CBN wheels are great, they cut well and are always the correct profile without needing to be re-dressed. They cut fairly cool, (and the ceramic ones Oregon ship with aren't bad in that respect either) but any abrasive working on such a small tooth will have a tendancy to overheat the metal if you go at it like a bull in a china shop. I'm going to experiment with the airline powered mister off the milling machine, misting the tooth with water as I sharpen.

 

 

Yes, i have seen LOADS of videos on Youtube of people sharpening chains, and in every single one they are taking FAR too much of a cut. A thou or two at a MAXIMUM I would have thought, otherwise you are definitely going to overheat the tooth. Your mist coolant idea sounds the business though.. To be honest, this is really how it ought to be done, would be a huge improvement as you say..

 

john..

[Stere]

Depends abit on how blunt/damaged the chain is how much is needed to be removed  to get it sharp but from the ones iv'e seen grinding often seem to  take  more than is needed. Also seems to be a common idea reduce all the teeth to to length of the shortest one which I think is abit unnescessary...

 

Remember on one homeowners chainsaw had he had the chain done by a shop on a grinder. When i looked at it after I wasn''t convinced it was even the same chain still on on the saw, as it had, had  so much material removed from what was a fairly new chain, that when it came back it looked  a near half worn one....

 

 

 

Maybe some places/people/machines do very a good job grinding many others no so much.....

 

 

Edited August 26, 2022 by Stere

[Stubby]

2 hours ago, Stere said:

 Also seems to be a common idea reduce all the teeth to to length of the shortest one which I think is abit unnescessary...

 

 

 

 

 

 

 

 

Agree on this . One or two short ones matters not .  . When filing if there are a couple of short ones I might give them one stroke where as all the others might get three . Eventually they will even up .

[openspaceman]

1 hour ago, Stubby said:

Agree on this . One or two short ones matters not .  . When filing if there are a couple of short ones I might give them one stroke where as all the others might get three . Eventually they will even up .

+1

[Woodworks]

1 hour ago, Stubby said:

Agree on this . One or two short ones matters not .  . When filing if there are a couple of short ones I might give them one stroke where as all the others might get three . Eventually they will even up .

Our processor is very fussy about tooth length. Saws far less so

[john87]

12 hours ago, Stubby said:

Agree on this . One or two short ones matters not .  . When filing if there are a couple of short ones I might give them one stroke where as all the others might get three . Eventually they will even up .

That is a very good idea!!

 

john..