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Post by chainsawwhisperer on Jan 21, 2009 18:01:29 GMT -5
This bar was on my Zip when I got it. It looks to narrow to be the original bar There are no #'s on it anywhere, there is a trace of what looks like Homelite Red paint on it at the bar mount. It is 26 inches long and 3 inches wide. The gage is .058, the sprocket is new, and the pitch is 7/16. What I am tring to figure out is how many drive links will the chain be if I convert it to .404. Would any of you guys be interested in the 7/16 sprocket? Thanks. CSW   |
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Post by MCS on Jan 21, 2009 21:10:23 GMT -5
Chain conversion - Here is one way to do it mathematically.  Example: 60 drive links of 7/16 to an equivalent length of .404 To calculate the pitch of chain, we measure the length between three consecutive rivets - note that this the length from one drive link to the next drive link - and then divided that length by 2. So if we take the pitch and multiply it by 2 we know the length for each drive link. So: 7/16 x 2 = 7/8 & 7/8 x 60 = 52.5" chain And: .404 x 2 = .808 & 52.5/.808 = 65 drive links in .404 ;D On that bar, how does the oil port and bolt slot compare to a super xl bar  |
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Post by lesorubcheek on Jan 21, 2009 21:15:00 GMT -5
hmmm... Not sure based on the bar, but a ballpark number should be able to be computed with some math assuming chain length will be the same.
7/16 = 0.4375
number links of 7/16 x 0.4375 = number links of .404 x 0.404
so
number of links of 404 = number of links of 7/16 x 1.0829
If you count for example, say 60 links of 7/16, then in .404 you'd need 64.97, or rounding up, 65 links.
That orta get ya pretty close.
Dan
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Post by lesorubcheek on Jan 21, 2009 21:18:27 GMT -5
A7... ain't it funny we picked the same number for an example! I just cancelled the 2 in the division.
Dan
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Post by billg on Jan 22, 2009 2:36:22 GMT -5
I would bet it is a 0.050 bar wore out.
Bill
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Post by chainsawwhisperer on Jan 22, 2009 10:57:21 GMT -5
I never thought about that The .063 gage fit but it was tight, the .058 seemed to fit just right. but there is visable wear to the rails, one is thinner than the other. But this begs the question: did they make 7/16 chain in .050? Or was that bar just stuck on there? CSW |
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Post by MCS on Jan 22, 2009 13:25:17 GMT -5
CSW, when you say the sprocket is new, are you saying this is a sprocket nose bar? When I looked at the picture in big format, it almost looks like a GW tip. I had 7/16 chain in the shop in the shop in the early 70's but I don't think it was .050.
I went thought the chain list on Acres and didn't find any 7/16 in .050 but that doesn't mean it doesn't exist. What happens when you measure the bar groove with feeler gauges? What will go all the way to the bottom?
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Post by chainsawwhisperer on Jan 22, 2009 15:53:55 GMT -5
A7E, it is a hard nose bar.
What I was wondering was, if I do convert the saw to .404, would anyone be intrested in the 7/16 sprocket?
CSW
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Post by billg on Jan 23, 2009 1:53:49 GMT -5
.......................... So, all of THAT begs THIS question; was the existing sprocket, bar and chain even a 'running' combo, or was it maybe just all thrown together to make a 'complete' saw? Know what I mean? ............................ I agree. It appears to be a mix. As for large pitch .050 gauge chain it was made in 1/2" but I have not seen it in 9/16 or 7/16. I do need some .404 .050 gauge. Bill |
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