2021 POTD Thread Archive

I repaired a beam trolley where one wheel had a missing chunk. TIG brazed Al bronze and machined back. The rolling surface was nonconcentric with the bearing by about 0.1” so I’m machining each of the rollers at least close to concentric. They are really tough steel and it’s brutal on the tool.
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jwmelvin said:
I repaired a beam trolley where one wheel had a missing chunk. TIG brazed Al bronze and machined back. The rolling surface was nonconcentric with the bearing by about 0.1” so I’m machining each of the rollers at least close to concentric. They are really tough steel and it’s brutal on the tool.
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no to the belt sander.

are the rollers naturally hard on cutters, or are they work hardened?
 
woodchucker said:
Greg, is that a chain mortiser?
Looking good.
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Yah, was toying with getting one, I knew Mike had one so stopped by to see what he thought of it. Said give this one a try. Sure makes the deep mortises a LOT easier. The shallow ones for the corner braces are faster to do by hand though.
Made up plate mount for an electric chain saw to cross cut and cut the tenons. Works great and gives about a 10 inch depth of cut.
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Greg
 
how big is this going to be? I see that you have sections that lock together with a half lap. Post a beam is cool. you pinning them with wood, or steel? Around here we are not allowed to use wood pins... dumb, since barns that are more than 150 years old are still standing.
 
woodchucker said:
how big is this going to be? I see that you have sections that lock together with a half lap. Post a beam is cool. you pinning them with wood, or steel? Around here we are not allowed to use wood pins... dumb, since barns that are more than 150 years old are still standing.
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Will be a 20 x 30 open front machine shed to park a couple of trailers and the tractor. Plan on using hardwood dowels. Not sure what the actual rules are, slipped this one past the building inspector as its a low occupancy building, for a shop or house you need to have an engineers stamp on the plans. Was surprised. Got to love rural.

Greg
 
woodchucker said:
are the rollers naturally hard on cutters, or are they work hardened?
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I am guessing they are hardened steel, and perhaps further work hardened. Even the flange was super tough. It’s been an interesting journey through my various tools. HSS was a quick experiment. Some of the garbage inserts break very quickly (it’s an interrupted cut due to the huge runout). Some did okay. I switched to brazed carbide partly because: I don’t have much use for them otherwise and have a bunch; and I have a Rockwell carbide grinder and wanted to try out the green wheel on it. It’s working out okay; I just have to resharpen a couple times per roller.
 
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