1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

chain sharpening questions

Post in 'The Gear' started by Joful, Apr 19, 2013.

  1. Joful

    Joful Minister of Fire

    Joined:
    Mar 7, 2012
    Messages:
    5,945
    Loc:
    Philadelphia
    1. I accidentally knocked just one depth gauge down too far on one of my RSC chains today, while experimenting with grinding depth gauges on the grinder. By too far, I don't mean a few thousands of an inch. It's half gone! Is it a bad idea to continue using a chain with one depth gauge mostly gone? All the rest are set at 0.025".

    2. I tried grinding a wee-little H36 chain for my Husq.T435 for the first time tonight. The recommended top plate angle (right from the Husqvarna T435 manual) for the factory chain is 80 degrees! I ground a few teeth on the factory chain (green label crap) to that, and it just looks all wrong to me. My other chains for that saw are Stihl Oilmatic 63 PMC-3 52's, and they look like they're sharpened to the same 60 degree top plate / 30 degree vise angles I use on my RSC chains. What gives?

    Helpful Sponsor Ads!





  2. bogydave

    bogydave Minister of Fire

    Joined:
    Dec 4, 2009
    Messages:
    8,426
    Loc:
    So Cent ALASKA
    Grinding the rakers low of might make your saw cut faster if it has enough power.
    Give it a try on some softer wood of green stuff. Should be OK.
    Speed cutter guys take the raker off to make faster cuts, lots of HP though.

    Is it the same as the Oregon 91VG ?
    try here (bottom of the page) : http://www.oregonproducts.com/pdf/chain/91VG_F&B.pdf

    . I use a file :)
    smokinj likes this.
  3. HDRock

    HDRock Minister of Fire

    Joined:
    Oct 25, 2012
    Messages:
    2,188
    Loc:
    Grand Blanc, Mi
    If it is just one depth gauge short , I don't think it's a worry about thing, but , others, correct me if I am wrong.
  4. NH_Wood

    NH_Wood Minister of Fire

    Joined:
    Dec 24, 2009
    Messages:
    2,602
    Loc:
    southern NH
    Maybe a little more vibration in the cut? Can't see anything dangerous, but never had a chain with one short raker. Definitely seems off on the file angle recommendation - teeth must have looked way off at that angle, unless I'm misunderstanding your post. Cheers!
  5. bogydave

    bogydave Minister of Fire

    Joined:
    Dec 4, 2009
    Messages:
    8,426
    Loc:
    So Cent ALASKA
    I'm with you.
    Just one ground down should not even be noticed .

    I was thinking the whole chain was that way. ;?
  6. BobUrban

    BobUrban Minister of Fire

    Joined:
    Jul 24, 2010
    Messages:
    1,479
    Loc:
    Central Michigan
    Just one will not be a problem and likely un-noticable. If you feel there is a real concern you could gring the tooth off and just eliminate one entirely but that is an extreme solution to a very minimal problem - if considered a problem at all.
  7. Havendalefarm

    Havendalefarm Member

    Joined:
    Mar 16, 2013
    Messages:
    65
    Loc:
    New Haven ,NY
    If, by chance or on purpose,you do get the rakers down a little then be prepared. One raker will not matter but if you do them all it WILL cut faster as each tooth is taking a deeper cut. But BE CAREFUL it will also kick back a LOT harder. I use a 372xp with a 16" bar and chain filed in this manner for blocking large quantities of firewood and it is not something for an inexperienced cutter.
  8. Joful

    Joful Minister of Fire

    Joined:
    Mar 7, 2012
    Messages:
    5,945
    Loc:
    Philadelphia
    Thanks guys. I figured as much. Unless that sole tooth happens to hit something rounding the nose, it likely doesn't matter.

    The bigger question was the top plate angle on the H36 and PMC-3 chains! ;lol
  9. MasterMech

    MasterMech Guest

    Many semi-chisel chains specify a much steeper angle than their full-chisel counterparts. Stihl RM series chain included.
  10. smokinj

    smokinj Minister of Fire

    Joined:
    Aug 11, 2008
    Messages:
    15,969
    Loc:
    Anderson, Indiana
    On those long chains I would never use the grinder. It makes a very bumpy ride down the road. I just use a file and keep them looking factory round. Flat rakers on a lone bar will give you tennis elbow! :eek:
  11. lukem

    lukem Minister of Fire

    Joined:
    Jan 12, 2010
    Messages:
    3,687
    Loc:
    Indiana
    You're not going to notice one raker being to low. No worries.

    I file my rakers by taking the top down to the right height (as measured by my gauge), then a couple extra passes on the front to get the slope right. Takes me way longer to do the height and angle at the same time...I don't have the knack for it.
    Joful likes this.
  12. smokinj

    smokinj Minister of Fire

    Joined:
    Aug 11, 2008
    Messages:
    15,969
    Loc:
    Anderson, Indiana
    Roll the file right over the top of the raker.
    Joful likes this.
  13. Joful

    Joful Minister of Fire

    Joined:
    Mar 7, 2012
    Messages:
    5,945
    Loc:
    Philadelphia
    Can anyone please decode this chart?

    http://www.stihlusa.com/WebContent/CMSFileLibrary/instructionmanuals/USG_sawchainangles_chart.pdf

    For example, what is the top plate grind angle setting for the PMC3 chain? Looking at the diagram of their machine, I would say that's angle "A", or 40°. However, looking at the right-most column, I would say it's 75 degrees. I've not ground any chain to 75 degrees yet, but it does more closely match the Husq. H36 spec of 80 degrees I mention in the OP.

    It seems clear to me the vice angle must be 30 degrees. No idea on vice tilt, unless that's the +/- 15 number, which my machine can't achieve. Also, no idea on what all the +/- 40 degree numbers are in column A.
  14. MasterMech

    MasterMech Guest

    That chart looks like it's specific to the Stihl USG grinder. I'll look at it more later.
    Joful likes this.
  15. Joful

    Joful Minister of Fire

    Joined:
    Mar 7, 2012
    Messages:
    5,945
    Loc:
    Philadelphia
    Thanks, Master Mech! That's what I got from it, as well. Unfortunately, I cannot find ANY literature that defines the three angles for a PMC3 chain:

    1. Top plate
    2. Vise angle
    3. Vise tilt

    I'm assuming these might be 75 / 30 / 15 degrees, but would like to know before I grind.
  16. smokinj

    smokinj Minister of Fire

    Joined:
    Aug 11, 2008
    Messages:
    15,969
    Loc:
    Anderson, Indiana
    Most grinder will always be 60 tilt 30 degree angle and some will call for vise tilt of 10. I never use the vise tilt. So 60/30 on all ripping chains and 60/25 on the pico chain and 60/10 on milling chain.
    Joful likes this.
  17. Joful

    Joful Minister of Fire

    Joined:
    Mar 7, 2012
    Messages:
    5,945
    Loc:
    Philadelphia
    Cool. Thanks, J. I was thinking of doing just that, but wondering why so many seem to be calling out 75 - 80 degrees head tilt on the pico.

    I do sharpen all my standard chains at 60 / 30 / 10 degrees. Yeah, the 10 on the vise tilt makes it dull quicker, but it cuts wicked fast with that hook, too!
    smokinj likes this.
  18. smokinj

    smokinj Minister of Fire

    Joined:
    Aug 11, 2008
    Messages:
    15,969
    Loc:
    Anderson, Indiana
    With the pico its a bit in the butt to clear the top of the cutter. With the 75 probably just letting it slip past it easier. I never lock my vise when doing them because you have to lower the wheel then slide the chain into place. My chain over 5 years old now it it called for 60 then, could be quicker. I will try it next time.
    Joful likes this.

Share This Page