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PostPosted: Sun May 29, 2016 12:02 pm 
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Elite

Joined: Sun Jun 30, 2013 8:51 pm
Posts: 457
Location: Warren MI.
I have a hydraulic cylinder from an old Kalamazoo 816 band saw that needs to be repaired.
Originally the set-up had a 1/4" OD. copper tube brazed to the upper section of the cylinder, That tube got damaged & needs to be replaced. [-(

I could always just re-braze a new 1/4" copper tube to the cylinder like the old set-up! But I'm thinking it may be a better idea to add a 90 degree flare or compression fitting to the upper part of the cylinder? It would make replacing the tube a lot easier if it got damaged again by a misguided piece of steel. :roll:

Anyone know of a source for flare or compression fittings that are made to be brazed/silver soldered or welded in-place?
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Hydraulic Cylinder 1.JPG
Hydraulic Cylinder 1.JPG [ 63.1 KiB | Viewed 387 times ]

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Hydraulic Cylinder 2.JPG [ 34.56 KiB | Viewed 387 times ]


Doug


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PostPosted: Mon May 30, 2016 1:57 am 
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Elite
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Joined: Sat Feb 28, 2004 10:12 am
Posts: 769
Location: Brownstown,Mi.
http://www.warrenpipe.com/
good luck
Wid T

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Seen it all, done it all. Can't remember most of it .


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PostPosted: Mon May 30, 2016 9:44 am 
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Elite

Joined: Sun Jun 30, 2013 8:51 pm
Posts: 457
Location: Warren MI.
Yeah I figured that Warren Pipe should have the threaded fittings like this 1/4" inverted flare/1/8" pipe fitting. Image

The problem with a threaded fitting is that the cylinder's wall is only .090 thick & there's not enough material to tap! My other option is to weld or braze a thicker piece of stock to the cylinder so that there's enough material to tap into.

They do make a aftermarket replacement cylinder for the saw that uses an automotive style banjo fitting at the cylinder's connection. Image But at just over $400 I think I'll work on fixing this one first.

Doug


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PostPosted: Wed Jun 01, 2016 8:54 am 
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Elite
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Joined: Fri Aug 05, 2011 4:17 pm
Posts: 944
Location: Farmington Hills
Could you replace the cylinder with another one of the same size. I know your bandsaw is a beast compared to the 4x6 saw but here is a modification someone did for there small saw.
http://bbs.homeshopmachinist.net/thread ... ed-control


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PostPosted: Wed Jun 01, 2016 10:45 am 
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Elite

Joined: Sun Jun 30, 2013 8:51 pm
Posts: 457
Location: Warren MI.
Jacob Nothstine wrote:
Could you replace the cylinder with another one of the same size.

Yeah I'm sure I could find something less expensive than the aftermarket unit I mentioned above.

If I can find the correct type of flare or compression fitting it would make replacing the tube a lot easier if it ever got damaged again.
If I can't find the type of fitting I'm looking for, I can just re-braze another 1/4" copper tube to the cylinder.

Another option I thought about would be to have a 1/4" stainless steel tube tig-welded to the cylinder :-k
The SS tube would take a lot more abuse from an accidental hit by a piece of steel stock than the soft copper tube.

Doug


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