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Post by glennz01 on Jan 14, 2016 3:18:52 GMT -5
So my old nelson still isn't working properly and I'm wondering if anyone has an old Nelson 14/16 that they could get photos of for me.. right now i'm wondering if the thing that holds the motor is the problem.
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Post by captbob on Jan 14, 2016 9:33:05 GMT -5
Why don't you explain the problem and post photos of what you think might be wrong so folks can comment on how it is set up?
Probably don't need to own a Nelson to spot if something is amiss.
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Fossilman
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Member since January 2009
Posts: 20,711
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Post by Fossilman on Jan 14, 2016 10:38:24 GMT -5
I second the idea! Photos and explain.....Thumbs up
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Post by glennz01 on Jan 14, 2016 11:15:29 GMT -5
I'm not really sure where the problem is is the problem.
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Post by Pat on Jan 14, 2016 11:18:28 GMT -5
I'm not really sure where the problem is is the problem. Sooooo take lots of pictures!
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Post by glennz01 on Jan 14, 2016 11:19:39 GMT -5
I'm not really sure where the problem is is the problem. Sooooo take lots of pictures! I'll have some photos whwn I have some time off work then
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Post by Drummond Island Rocks on Jan 14, 2016 11:20:12 GMT -5
I'm not really sure where the problem is is the problem. Then how do you know there is a problem?
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Post by Pat on Jan 14, 2016 11:26:37 GMT -5
... and what are the symptoms?
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Post by glennz01 on Jan 14, 2016 11:28:03 GMT -5
... and what are the symptoms? The blade binds, thats the problem.... I'm not sure what is causing it... and the nelson has an different setup compared to most modern units.
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Post by Drummond Island Rocks on Jan 14, 2016 11:47:39 GMT -5
Blade bind usually means your vice and blade are not aligned properly. A pencil clamped in the vice is quick check but a dial indicator is the proper way.
clamp the pencil in the vice with it just touching the blade at the front edge and push the vice to the back of the blade and see it the pencil stays touching the blade.
No idea about a Nelson but my adjustments on mine are made at the arbor. Some saws have adjustments at the vice.
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Post by captbob on Jan 14, 2016 12:11:17 GMT -5
You talking about this saw or this saw? Not sure which of your saws is the Nelson...
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Post by glennz01 on Jan 14, 2016 16:17:13 GMT -5
You talking about this saw or this saw? Not sure which of your saws is the Nelson... The 2nd saw. I will try your technique Drummond Island Rocks Although the blade only seems to bind when it is cutting through thick material. I think the problem, if not allignment, could be that the motor is only supported up by the pully so if it has to work hard it slips? I'm not sure if it is designed like that or if that is the problem. I'm also not really sure where the alignments would be as it just sits on the rails. I'm not sure how "rare" these machines are as I can only pic 1 pic of a Nelson like mine online.. my serial number is very low though. Supposedly the site claims it is made in 1936. Heres another pic I found
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jamesp
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Member since October 2012
Posts: 36,564
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Post by jamesp on Jan 14, 2016 18:00:51 GMT -5
The shaft on the back is the feed. Looks like the same design as a Covington saw. There should be a sheave with 2-3 grooves of different sizes to slip the belt on to for variable speed feed. Sounds like your feed is too fast if you can saw small rocks only.
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Post by glennz01 on Jan 14, 2016 19:49:41 GMT -5
The shaft on the back is the feed. Looks like the same design as a Covington saw. There should be a sheave with 2-3 grooves of different sizes to slip the belt on to for variable speed feed. Sounds like your feed is too fast if you can saw small rocks only. I did a pencil test and there is not much that needed allined, however it still binds with that and the motor thing in place. There is a very slight dish to the blade but it is very minor and not really the issue. The saw does not appear to be cutting straight though. As for speeds, to my knowledge it it not variable speed and the speed is very slow (takes a few min to go 1 inch) I wish it was faster! I' i'm not sure where the problem is really... I have a few smaller old blades that might have the same size arbor hole that I can get tonight out of storage.. I'll see if maybe it is the blade if one works
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Post by Drummond Island Rocks on Jan 14, 2016 20:36:11 GMT -5
The saw does not appear to be cutting straight though. As for speeds, to my knowledge it it not variable speed and the speed is very slow (takes a few min to go 1 inch) I wish it was faster! Not cutting straight is the definition of an alignment issue. As for speed my 14" auto feed cuts at 5 minutes per inch and my 10" lortone auto feed is even slower so a few minutes per inch is not slow. Chuck
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jamesp
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Member since October 2012
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Post by jamesp on Jan 14, 2016 20:44:11 GMT -5
The saw blade is normally driven directly from the motor. single groove sheave to single groove sheave. Do you have a sheave/pulley on the saw that looks like this with different size grooves ? The Covington uses a variable sized pulley like this to change the feed rate.
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jamesp
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Member since October 2012
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Post by jamesp on Jan 14, 2016 20:52:25 GMT -5
Yes, Chuck is right, several minutes or more per inch is correct. Expensive saws have slow feed rates and make smooth cuts. My Covington has 6 feed rates. The slower the feed, the smoother the cut, and less time on the lap.
Maybe the blade needs dressing. Have you dressed the blade ?
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Post by glennz01 on Jan 15, 2016 1:34:55 GMT -5
Not cutting straight is the definition of an alignment issue. As for speed my 14" auto feed cuts at 5 minutes per inch and my 10" lortone auto feed is even slower so a few minutes per inch is not slow. Chuck Yeah, something is not aligned but i'm not sure what. It is possible that the blade is warn out soo much that it is not cutting fast enough I guess. I found a smaller 7 inch or so blade that should have the same size arbor hole. I'll try it out probably this weekend or after work presuming I have time.. My good saw can cut through a decent sized rock (6"by 5" or so) in roughly 5-10 min which is why I didn't think the speed is an issue. I'll see what this other blade does and if it cuts good i'll know it is just the blade, if it doesn't do good than i'm not sure. If the allignment setting is with the 3 bolt things on the shaft I'm going to need lots of wd-40 as I hadn't thought an allen wrench could twist as much as it did
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Fossilman
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Member since January 2009
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Post by Fossilman on Jan 15, 2016 9:58:08 GMT -5
What is your cutting speed per RPM? When was the last time the blade was dressed out? Run some fire brick through it or Obsidian....
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jamesp
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Member since October 2012
Posts: 36,564
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Post by jamesp on Jan 15, 2016 9:58:10 GMT -5
This might be a long thread.
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