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Hi Tim You say between services does this mean dealer service ?
I prefer the dealer to sharpen my blades as not confident enough to use a motorised device in case I damage the blade profile .
I find after cleaning all the resin / sap off the blades with cleaner of choice a narrow piece of slip stone and oil re sharpens the edge without damage with blades in situ .
Not sure about modern sharpening stones they just wear away , something more like a piece of old oil stone although the niwaki sharpening stones look okay .
Some get good results with a hand file with the blades in situ .
Cordless grinder for me. Two to three passes leaves it like a razor, Takes 10 mins rather than 45mins with a file.
I let the dealer do that... same as John.
I also am pretty careful as to what I ask them to cut - no chewing through growth thats too coarse for them - and clean them off with spray after most times they are used.
Anglegrinder with the blades still on the machine. A 10 minute job. 15 minutes if the blades are on each side. Try not to heat the blades up with thegrinder............ I might b e wrong but I suspect it might affect the hardness.
Cordless grinder with a1mm cutting blade
One dealer informed me that Lazer cut blades start to become compromised after first sharpening and then need more regular sharpening as they don't retain their edge but stay sharp for around Three years from new depending on use .
It's hard knowing what to believe though .
Thanks folks. Yes, I'm talking about between dealer services. Majority view seems to be angle grinder, but carefully!
In theory if you use an angle grinder the blade is cutting upwards and not making a clean sharp edge
i use a good quaity file.
I always use an anglegrinder and it rotates toward the cutting edge of the blades..... not cutting upwards. Always gives a sharp edge.