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Roller Guide Arm Issue

Started by pri0ritize, June 24, 2013, 02:41:37 PM

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pri0ritize

So I'm back again looking for more advice!

Yesterday evening I was milling again making good progress on getting my log pile whittled down and had just started trimming a log down. I forgot that I had the accuset set and set the band onto the top of the log pretty hard. I've had this happen before and most times I've caught it very fast. For some reason this time I couldn't get the mill head to stop moving down. After that I checked to make sure everything was fine and nothing was bent but the roller guide arm is loose. I stopped milling and got my manual out to determine how to tighten it back up, figured out what I needed, made a quick trip to Home Depot because I didn't have a 15/16" wrench handy and started working on getting the bolts tightened back up. The question I have is...how tight is tight? 

I want to make sure that I have the arm tight enough that it doesn't move but I don't want to force anything (as I'm prone to do). I don't remember ever feeling how tight it was now but if I yard on the guide now it doesn't move and the mill head will so I'm hoping that's the right amount. I realize I'll need to realign everything before I saw again but I figured I'd ask the question before I got too far down the path.

Thanks for all the help!
2012 LT40HD
Random Stihl Chainsaws and more woodworking equipment than I care to inventory!

POSTON WIDEHEAD

It sounds like you've done a good job. Just snug the bolts pretty good. You can always re-tighten if you need to but its a party if you break a bolt off.

And yes....it is always wise to check alignment after this happening. I've done it myself using my simple set.
It'll scare ya to death when that your blade looks like an upside down "U".  :D
The older I get I wish my body could Re-Gen.

drobertson

Howdy Prio! you might also check how the arm is aligned while moving in and out, find a fixed point on the blade guard and measure to the band all the way in and out.  the bolts that hold the rollers are on an eccentric, and can become an issue with blade height from the bed at differing width cuts.  Just a thought,  david
only have a few chain saws I'm not suppose to use, but will at times, one dog Dolly, pretty good dog, just not sure what for yet,  working on getting the gardening back in order, and kinda thinking on maybe a small bbq bizz,  thinking about it,

WDH

Quote from: POSTONLT40HD on June 24, 2013, 03:27:11 PM
You can always re-tighten if you need to but its a party if you break a bolt off.

"It's my party and I will cry if I want to" came to mind, but I hope that it does not come to that. 
Woodmizer LT40HDD35, John Deere 2155, Kubota M5-111, Kubota L2501, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

POSTON WIDEHEAD

Quote from: WDH on June 24, 2013, 04:50:33 PM
Quote from: POSTONLT40HD on June 24, 2013, 03:27:11 PM
You can always re-tighten if you need to but its a party if you break a bolt off.

"It's my party and I will cry if I want to" came to mind, but I hope that it does not come to that.
:)
The older I get I wish my body could Re-Gen.

YellowHammer

After any blade guide arm crash (don't worry, it happens) loosen or remove the band to remove any preload and start tugging on the arm.  It should be rock solid in all positions.  Sounds like you got it right.
YH
YellowHammerisms:

Take steps to save steps.

If it won't roll, its not a log; it's still a tree.  Sawmills cut logs, not trees.

Kiln drying wood: When the cookies are burned, they're burned, and you can't fix them.

Sawing is fun for the first couple million boards.

Be smarter than the sawdust

MartyParsons

Hello,
   If the saw head came down on the log and the blade guide arm is loose the metal around the adjustment bolts is bent. Sometimes you can adjust this out and sometimes you will need to bend it back. The bolts will not bend.
   When you are facing the tensioner, the upper left and the bottom right bolts will need adjusted or bent back into position. You will need to check the measurements with the arm in and out it should not change as it travels. The blade guard arm needs to be tight, but if you shear off the gear pin on the motor or the motor is pulling to hard then you have it overtightened.
   If you need to bend back the bolts you will need to remove the blade guide arm.
Thanks
Marty
"A pessimist sees difficulty in every opportunity; an optimist sees opportunity in every difficulty." -Winston Churchill

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