Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 61 to 74 of 74
-
25th February 2011, 11:19 PM #61SENIOR MEMBER
- Join Date
- Sep 2008
- Location
- Coffs Harbour
- Posts
- 575
-
25th February 2011 11:19 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
26th February 2011, 01:47 PM #62
OK first of all I realised upon further thought my own silly mistake made in my previous statement, too many beers after a hard day will be my excuse.
any way I went to my shed and got out a brand new stihl chain and my 300 mm/ 12 inch digital verniers and did some measurements with the chain held taught so as not to get any possible distortion of measurement and after careful measurement one figure consistently appeared. As I say this was on BRAND NEW UNUSED stihl chain and carlton or oregon or windsor may differ a small amount. I do know that stihl extensively pre stretch their chain in production.
I can say that .375 is wrong and .367 is as close as to what I got, measuring as accurately as possible regardless of number of links I got .368 every time although the difference between 0.367 and 0.368 could be as simple as thumb pressure on the verniers, but the the difference to 0.375 is huge and visible by eye quite clearly.
Congrats BobL you are right.I am told that sharpening handsaws is a dying art.... this must mean I am an artisan.
Get your handsaws sharpened properly to the highest possible standard, the only way they should be done, BY HAND, BY ME!!! I only accept perfection in any saw I sharpen.
-
26th February 2011, 01:53 PM #63
Now thats sportsman like big thumbs up for Travis
-
26th February 2011, 08:43 PM #64SENIOR MEMBER
- Join Date
- Sep 2008
- Location
- Coffs Harbour
- Posts
- 575
What does .404" chain measure when tested the same way ? Are we dealing with a chain measuring conspiracy / plot to throw us off the scent of something bigger.
regards inter
-
26th February 2011, 09:18 PM #65.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,826
0.404
Are we dealing with a chain measuring conspiracy / plot to throw us off the scent of something bigger.
regards inter
3/8 has always been called 3/8 because calling it 367/1000 is a bit of a mouthfull.
0.375 differs from 0.367 by only 2% , so 3/8 was the closest simple fraction that could be used, and yanks like simple fractions so it couldn't be called 0.367. it could also be called 47/128 (since that differs from 0.367 by only 0.05%) but that is probably worse.
-
26th February 2011, 09:41 PM #66SENIOR MEMBER
- Join Date
- Sep 2008
- Location
- Coffs Harbour
- Posts
- 575
So technically its called .375" pitch chain, but technically it doesn't exist.
regards inter
-
27th February 2011, 12:58 AM #67Tool collector
- Join Date
- Nov 2004
- Location
- Santpoort-Zuid, Netherlands
- Age
- 67
- Posts
- 462
Hahaha! Still, i got the same results as Travis, so congrats indeed. Took a used Stihl 3/8 RSC chain and laid 25 sets of three rivets in a straight line (just like Inter did with 10 sets). Here in metric mainland Europe, i was tought that one inch equals 2.54 centimeter. So, with each unit of 0.750" being 1.905 centimeter, i should have arrived at 47.625 centimeters for 25 units. But i didn't, it measured 46.7. Devided by 25 you get 1.868 cm for each unit and that's 0.734 inch instead of 0.750. 0.734 devided by 2 is 0.367125.
No idea why they chose that particular size. Whereas a "13 mm drill" for metric markets sound nice and round as a "1/2 inch drill" on imperial size oriented market (in spite of 1/2"being only 12.7 mm), there is neither a nice round logic to be found in 0.367" nor in its metric translation 0.93218 cm. Like others have stated in their contributions, i also think 3/8 sounds nice, since it is a very frequently used unit in the tool world, of which even leymen tool users can have a good imagination.
To bend the thread back to the 090;
do anyone of you use a rim sprocket on an 090? What are your experiences on wear and behaviour?
cheers
gerhard
cheers
gerhard
-
27th February 2011, 02:27 AM #68.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,826
-
28th February 2011, 07:46 PM #69
You would think that being a saw doctor I would have known this but it is honestly something I have never had to check, you look at a chain and you can see what it is, .325, 3/8 lo pro, 3/8 or .404. When you make up a chain off a roll you simply pick it off the one marked with the appropriate size. I have measured practically every other thing you could ever need to on a chain but never bothered with the obvious....lol
I am told that sharpening handsaws is a dying art.... this must mean I am an artisan.
Get your handsaws sharpened properly to the highest possible standard, the only way they should be done, BY HAND, BY ME!!! I only accept perfection in any saw I sharpen.
-
28th February 2011, 09:59 PM #70Tool collector
- Join Date
- Nov 2004
- Location
- Santpoort-Zuid, Netherlands
- Age
- 67
- Posts
- 462
Hi Travis,
it was my meter per minute diagram measured at several RPM's, that brought the topic of 0.08" difference up in the first place, because i based my calculations on 0.750" worth of chain tranport for every sprocket tooth. Since i promised a corrected diagram for 0.734"anyway, i think i better measure up 0.404 and 0.325 as well before i upload it, to prevent this issue from becoming a never-ending story. Though i believe Bob stated that he agreed with my other figures.
404-chains i do have, but 0.325 will be hard to find over here. The neighbours have a B&D-thingy, but i believe that's 3/8 LowProfile, as most hobby saws are. I'll try to get back with the results soon.
My question: has any other forum member and 090 owner experience with rim sprockets on his saw? My 070 is fitted with one and it works, but it looks very flimsy. I can see this option tear to bits or derail with 8-plus hp.
regards
gerhard
-
1st March 2011, 08:26 PM #71
Hi gerhard I run rim sprockets on all of my saws, I would not consider them any more flimsy than a spur sprocket. There is actually a lot of strength in a rim sprocket in the way it is made. I would say that BobL would have rims on his 880 which is over 8 hp and they handle it alright. The crankshaft was designed to be strong enough to handle the out board clutch of the 090, so I would not even consider it to be an issue and would honestly think a large percentage would have been sold with them especially of the later model av's.
I am told that sharpening handsaws is a dying art.... this must mean I am an artisan.
Get your handsaws sharpened properly to the highest possible standard, the only way they should be done, BY HAND, BY ME!!! I only accept perfection in any saw I sharpen.
-
10th March 2011, 04:07 PM #72Novice
- Join Date
- Oct 2009
- Location
- canberra
- Posts
- 20
Just an update. My Fake 070 has about 8 hours on it....now the crank is stuffed and the magneto damaged. Add to that the barely functional carburetor and the replacement rewinds you should get the general picture of what a few hundred bucks will buy you in the way of a Chinese "Stihl" 070 .
I picked up a lightly used MS 880 on the weekend before I got the news about the 070. If the pull start doesn't break my wrist I should be much better off now.
-
1st February 2012, 02:26 PM #73New Member
- Join Date
- Feb 2012
- Location
- crescent city calif.
- Posts
- 1
090 stihl
The 090 stihl comes alive if you bend the governor off and use a straight through midway muffler.
-
1st February 2012, 04:15 PM #74.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,826
As far as I know the 090 governor kicks in when the revs get too high by slightly activating the choke at higher rpm. This just limits the max revs the saw can reach by indirectly richening up the air/mix ration but doesn't change the performance of optimum cutting rpm in the cut so it does not affect milling speed in anything except small logs where more chain speed helps. The saw sounds more alive when the governor is removed because high rpms are achievable but these extra rpms have little useful power behind them. In the cut optimum power RPMs will still be in the 6.5-7k RPM range which can be obtained with the governor on. Raker depths of course must be optimised.
Modifying the muffler will increase power in the cut provided the saw is re-tuned correctly.
Similar Threads
-
070 stihl
By bluegum30 in forum HAND TOOLS - POWEREDReplies: 2Last Post: 12th November 2010, 09:48 AM -
Stihl 084
By nifty in forum SMALL TIMBER MILLINGReplies: 7Last Post: 11th September 2010, 04:37 PM -
Stihl dillema - What would you do?
By Kaiser Soze in forum HAND TOOLS - POWEREDReplies: 31Last Post: 11th April 2009, 08:14 PM -
Stihl 090 for $650
By Steve Fryar in forum SMALL TIMBER MILLINGReplies: 8Last Post: 17th July 2008, 07:44 PM