Ok for this observation, I am using 3/8 semi chisel chain in 0.063, one used chain that cuts well, and has lost a few teeth, ie is at the end of its life, and a new chain.
On the used chain I had been using the Husky roller guide that has the progressive raker guide attached to it, and using the raker guide only. I use the basic stihl file guide with 5.2mm file for the tooth.
yes the chain needs to be sharpened again, have not got around to it yet.
I found on the stihl raker guide that rested over the top of the chain, the long U shaped one, it would not cut enough off the raker, as the tooth was worn back, or shortened due to regular filing, and moved to using the husky guide, but even that didnt remove enough to make the chain self feed like a new one, so I would use the husky raker guide, then take a few more passes with the file, and then round the raker profile to make it cut like a new chain.
Took a bit of attention to get the last few wipes of the file to a consistent and even depth along the chain, but it worked.
What I have noticed with the stihl progressive raker guide is that it confirms that the husky guide, when on stihl chain, didnt take enough off the raker height as the tooth length shortened.
hard to see in the pictures, but I tried to show the difference on a chain that had been previously taken down with the husky raker guide.
Also, their angle on the leading part of the raker would also be different as well.
Am yet to go over the chain again, and use the stihl guide, and see how it cuts, but I expect it to be good, due to previously mentioned observations on the rakers finished height.
Here are some pictures and some measurements.
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cheers chaps.
Edited to add.
I realised that when using the raker guide on this chain, I would use the soft setting, but took photos of it on the hard setting, at least its consistent, but the chain has had a few sharpenings on the tooth, without touching the raker, that would be why the raker sits up proud of both gauges in the photos. Chain is at end of life, so has been used for dirty wood, and havent hit the rakers for a while when touching up the tooth from its hard duty.
Realised that I had not completely finished the edit, sorry for those who read it and went Huh ?, I need some sleep, and yes it needs to be resharpened, it last cut dead dry sugar gum, for those that have cut it, will know its a reasonably hard wood.