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#Post#: 87434--------------------------------------------------
Oregon 511A vise & stop pawl modifications similar to Silvey
By: Elden Date: December 2, 2020, 6:41 pm
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I am attempting to do a chain vise and stop pawl
modification, similar to a Silvey 300 or 510, on an Oregon 511A.
There is a post on Arboristsite (of which I am a member but
heretofore have been unable to post there) that shows the
modification I am attempting to accomplish.
HTML https://www.arboristsite.com/community/threads/511a-grinder-improvements-tweaks.197073/post-5581905
It appears that Grande Dog of Left Coast Supplies is not
available to obtain information from.
The "Faultless" stop pawl assembly is available from Madsens,
but the vertical arm (stop mount bracket) on which it mounts is
not. Neither is the other vertical arm (tooth length adjustment
screw mount), through which the adjustment screw is threaded,
available.
Not having a Silvey or ever seeing one in person, I would
like to ask a few questions of Silvey Round Ground chain grinder
users.
1. How far above the top of chain bar does the stop mount
bracket extend? (preferably to the center of the stop pawl
assembly's pivot bolt)
2. How long are the stop pawls that are mounted on the above
stated (question 1) stop mount bracket?
3. What is the distance between the point where the grinding
wheel would contact the top of the chain bar and a line drawn
perpendicularly to the top of the chain bar from the bottom
pivot hole of the stop mount bracket?
/
| /grinding wheel
| /
_|_________/_____________
o chain bar
_|______________________
I plan to purchase the pawl assembly from Madsens, but want
to be sure that they are the correct length for the dimensions
of the parts that will have to be fabricated. Hopefully those
parts can be fabricated without a lot of trial and error.
Many thanks,
Elden
#Post#: 87436--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Chainsawrepair Date: December 3, 2020, 6:34 am
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Sorry no help here. I never owned a Silvey round or Oregon.
Just a Stihl USG round and Silvey square.
#Post#: 87437--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Chainsawrepair Date: December 3, 2020, 6:37 am
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Try contacting Shaun at [member=1022]srcarr52[/member] because
last I knew he was making pawls for the silvey square grinders.
He might know. Heck he might have them or can make them too.
#Post#: 87438--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Chainsawrepair Date: December 3, 2020, 6:38 am
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HTML https://youtu.be/wp4xnqvBF80
#Post#: 87441--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Elden Date: December 3, 2020, 12:13 pm
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Cut4fun,
Thank you for the reply. Will try contacting him.
Elden
#Post#: 87573--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Elden Date: January 18, 2021, 9:28 pm
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I have been making slow but sure progress on the
modification. Started with making the arms out of wood as it is
easier to tweak than metal. After it is finished I will try to
post some pictures and dimensions. Definitely like the way the
stop pawls lock the cutters down.
#Post#: 87589--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Elden Date: January 25, 2021, 8:57 pm
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Using temporary wooden arms to determine functionality. Works
well for 0.325 and 3/8 lp chains but may have to increase the
height of the pawls slightly for full size 3/8.
[attachimg=1]
#Post#: 87592--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: 3000 FPS Date: January 26, 2021, 11:01 am
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Is the stock pawl not good enough to give consistent results.
Just curious.
#Post#: 87593--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Elden Date: January 26, 2021, 2:08 pm
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I personally have had trouble getting consistent results with
that pawl assembly. It is not due to the pawl itself but to the
arm assembly it sits on. It will flex fairly easily. By using a
very light touch when seating the cutter against the pawl,
results are pretty good. I am sure there are many who have no
problem with it.
I have a couple of Foley 308s on which the pawl assembly is
more sturdy, thus I am probably prejudiced. From the preliminary
trial with the temporary set-up, I am pleased with the results.
Once the permanent metal arms are made, the return spring
installed, and the vise tensioner installed, I should get a
better idea of its practicality through usage. At this point, I
am thinking the Foleys may get a similar modification.
#Post#: 87714--------------------------------------------------
Re: Oregon 511A vise & stop pawl modifications similar to Si
lvey
By: Elden Date: February 26, 2021, 10:27 pm
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The project is mostly completed. Thus far I am impressed with
its performance. It holds the tooth down well and seems to be
very solid. The original Oregon set-up had the possibility of a
fair amount of flex. Pictures have been quite shrunken and
clarity well reduced so forum software will accept them
hopefully.....
Prototype following the wooden arms (stop mount bracket and
tooth length adjustment screw mount).
[attachimg=1]
Disassembled stop mount bracket, tooth length adjustment screw
mount and tooth length adjustment screw; stop pawl assembly
[attachimg=3]
[attachimg=2]
Getting close to final assembly. May eventually shorten the
tooth length adjustment screw and fit a knob on it instead of
the acorn nut.
[attachimg=4]
View of the backside of the vise assembly. The casting is sloped
on this side. A wedge was fabricated to make this surface at a
right angle to the hole for the stop mount bracket pivot bolt.
This hole was not originally in the casting.
[attachimg=5]
Depth gauge check tool in position (backside of vise). Relief
slots that were filed into the arms are visible. These were
necessary for the tool to fit while the chain is in the vise. I
grind depth gauges on a separate Nielson grinder but do the
initial depth gauge check (go, no go) here.
[attachimg=6]
Cheater handle for the old man who has lost his strength! Not
necessary all the time, but it is amazing how tight it can be
sometimes even though it was hand tightened.
[attachimg=7]
Elden
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