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Author Topic: I cut my sawmill in half!  (Read 16194 times)

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Offline deadfall

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Re: I cut my sawmill in half!
« Reply #20 on: August 01, 2015, 10:13:45 PM »
I did though not actually think about freezing water in there, so i'm going to really its sealed well by the bolts. But I think what will makes a difference is that I will actually make a cover of something that will go around the angle grinder cut to help keep water

I was not talking about water freezing.  I was talking about aluminum oxide and iron oxide and the witch's brew of whatever is created in the presence of water when those two dissimilar metals get wet and electrolysis kicks in.  It will be its own battery of sorts if it is ever wet. 

So I'm talking about seizing.  Yes, you will need to have some way of sealing the cutoff joint and have some kind of roof or flash to not even let rain get near that joint.  When that aluminum is making white stuff and the steel is making red stuff, your thousandth of an inch will fill up fast with whatever product is produced in the presence of moisture. 

Even condensation could bite you.  That's why I mentioned some kind of lube that would leave no room for any moisture on those surfaces.  You might even make it part of regular maintenance to see it stays moving free and well lubed.  Maybe even have some grease zirks and fill it with a marine grease. 
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Offline 4x4American

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Re: I cut my sawmill in half!
« Reply #21 on: August 01, 2015, 10:25:35 PM »
Fluid film is good.  That is a good point about dissimilar metals.  It is common practice to put some sort of a barrier between dissimilar metals.   When the fab shop bolted an aluminum box to the steel frame on our F550, they put this paper looking stuff in between it.  When I would weld new steel decking into the 53' box trailers, I had to put that barrier in between where it bolts to the alum. side. 


I would say another thing that would help besides keeping moisture out and keeping it well lubed would be to work it every so often on a regular basis.  Basically, don't let it stay in one position for too long.  Figure out how often you need to move it throughout the different seasons and go from there.  Then it will just be another thing to add to your PM list.  No matter how well you seal it, moisture will find it's way in, I'm sure of it.  Condensation is something to keep in consideration.
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Offline PC-Urban-Sawyer

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Re: I cut my sawmill in half!
« Reply #22 on: August 02, 2015, 07:39:12 AM »
Perhaps something like the NOALOX Anti-Oxidant paste electricians use on aluminum connections would help minimize the potential problem. http://www.homedepot.com/p/Ideal-NOALOX-4-oz-Anti-Oxidant-Compound-30-026/202276208

Offline Peter Drouin

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Re: I cut my sawmill in half!
« Reply #23 on: August 02, 2015, 07:43:37 AM »
And you have to make a blade guard arm longer too.

Offline bkaimwood

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Re: I cut my sawmill in half!
« Reply #24 on: August 02, 2015, 07:56:03 AM »
Bimetal corrosion...dielectric grease works well in areas of steel vs aluminum as well...
bk

Offline dean herring

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Re: I cut my sawmill in half!
« Reply #25 on: August 02, 2015, 08:44:11 AM »
Havent yet Mr. Piney videos don't play very good at home. Will watch tomorrow at work
Thanks
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Offline Chuck White

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Re: I cut my sawmill in half!
« Reply #26 on: August 02, 2015, 08:57:12 AM »
Might not be a bad idea to coat the "permanently bolted" parts with antisieze compound!

Neat project.
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Offline GAmillworker

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Re: I cut my sawmill in half!
« Reply #27 on: August 02, 2015, 09:10:02 AM »
Great work.

Looking forward to second video.
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Offline 69bronco

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Re: I cut my sawmill in half!
« Reply #28 on: August 02, 2015, 09:27:55 AM »
Thanks for sharing! looking forward to the completion popcorn_smiley

Offline IndianaJoe

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Re: I cut my sawmill in half!
« Reply #29 on: August 02, 2015, 09:33:31 AM »
That fluid film is some amazing stuff. It is not petroleum based, but rather lanolin based. The can says that it will never dry out. I bought a can for the first time this spring as a treatment for ringworm in our show steers. A five day treatment was all it took, and it smells pleasant also.

Offline pineywoods

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Re: I cut my sawmill in half!
« Reply #30 on: August 02, 2015, 12:06:13 PM »
Have you given any thought to adding some kind of power assist to extend and retract the outboard section? Like maybe an acme threaded jackscrew ? In my case, I would leave it normal length and run normal blades until one of them monster logs showed up, then extend and mount the long blade. I don't think there would be any problem with bandwheel alignment..Corrosion and seizing may be a problem with the aluminum insert. If I do mine, I'll go with steel, but then I have welding equipment and a fair sized milling machine.. Lube...look into silicone grease, kinda pricey but never gets hard or dry, won't melt and sheds water..

Thanks for the video, you got me thinking...
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Offline Dave Shepard

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Re: I cut my sawmill in half!
« Reply #31 on: August 02, 2015, 07:20:03 PM »
And you have to make a blade guard arm longer too.

Maybe. Maybe not. When set wide, the throat will be full of log, and you won't need to move it in close.
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Offline 4x4American

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Re: I cut my sawmill in half!
« Reply #32 on: August 02, 2015, 08:22:58 PM »
I like when my mill has a throat full of log lol
Boy, back in my day..

Offline Percy

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Re: I cut my sawmill in half!
« Reply #33 on: August 02, 2015, 09:50:41 PM »
I like when my mill had a throat full of log lol
:D :D :D ;D :D :D :D ;D ;D ;D
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Offline deadfall

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Re: I cut my sawmill in half!
« Reply #34 on: August 02, 2015, 11:10:10 PM »
I like it when it clears its throat. 
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Offline dustintheblood

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Re: I cut my sawmill in half!
« Reply #35 on: August 03, 2015, 07:03:03 AM »
I watched it skeptically until 0:56 when your fitter friend showed his timmies.... I then knew he was a pro, and a good Canadian lad!

Great work!
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Offline sdunston

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Re: I cut my sawmill in half!
« Reply #36 on: August 05, 2015, 10:40:09 AM »
Great Idea,I have enough work fighting 28" let alone 48"
 :D.......looking forward to part 2

Sam
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Offline Jeff

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Re: I cut my sawmill in half!
« Reply #37 on: August 05, 2015, 04:15:52 PM »
I'd think that a galvanic corrosion issue is going to be a constant concern with the moving parts destroying any mechanical separation (lubricant, paint, etc). You might look into adding some sacrificial anodes.  I can remember years ago when a friend went out to use his aluminum boat. it had been turned upside down on saw horses for about a year. He had been working near it on some other project and had laid 3 steel flat washers on the boat near the stern. In the rather short time they had been there, they had corroded all the way through the aluminum. He had to have it patched.
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Offline canadianwoodworks

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Re: I cut my sawmill in half!
« Reply #38 on: August 05, 2015, 09:27:59 PM »
I'll have to make some decisions about the aluminum contacting the steel, I did not know about the issues.

I have thought about making it move in an out at the flick of a switch, but no set plans, first get it cutting at extended width.

I just received my blade 195'' I should have about a 46'' throat. We have milled with the mill in it's stock position for an entire week since putting it back together with no issues.

Thanks for all the well wishes & suggestions! 

Offline Tom L

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Re: I cut my sawmill in half!
« Reply #39 on: August 06, 2015, 08:25:42 AM »
I'd think that a galvanic corrosion issue is going to be a constant concern with the moving parts destroying any mechanical separation (lubricant, paint, etc). You might look into adding some sacrificial anodes.  I can remember years ago when a friend went out to use his aluminum boat. it had been turned upside down on saw horses for about a year. He had been working near it on some other project and had laid 3 steel flat washers on the boat near the stern. In the rather short time they had been there, they had corroded all the way through the aluminum. He had to have it patched.

that's a good idea, you would have to run a ground wire from one of the thru bolts that goes thru the steel and aluminum and attach the other end of the ground to a anode, I know they sell them for boats , large zinks that are grounded throughout the boat , they corrode before anything else,
the only question I would have is that most zinks that I know of are in water.
will a zink work if it is in air?


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