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Working on a new tiny shop

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CrazyModder:
EDIT: oops, that got rather long, sorry for hijacking your topic. :)


--- Quote from: vtsteam on December 29, 2014, 11:05:14 AM ---Crazy, I was just thinking about inlaying a section of angle iron in the bench edge with tapped holes to accept a second piece for bending sheet metal  :)  -- is that what you had tried?

--- End quote ---

I can't take a good photo now, but here's one that accidently shows part of my solution.

On top of the work, there goes another angle iron. Pressure is applied by a sturdy piece of stock and two threaded rods which go through holes in the table (one of which is visible). The angle iron dangling off the table is then pulled up, which does not take much force and  is easily done by hand for the sheet thickness you see on that image (0.75mm). I did not pay attention to the the round edges of the angle irons when buying them, and actually had to mil down the lip of the angle that presses down on the work. I also milled recesses for the hinge-joints to move the active plane of the angle iron more into center (sorry, I think my foreign language skills are breaking down right now :) ) but could not be bothered to make that completely perfect.

Test pieces could be bent very well.

Setting up is time consuming though, since there are no stops of any kind, and much trial and error. I could live with that, but unfortunately, the whole solution quite suddenly stops working at all when you consider works of different length and with bits protruding on the side of the currently bent area.

Well, live and learn; the box on the image was then bent with your method, easy enough.




DavidA:
VT,

Just been looking at the pictures of your pulley assembly.  It's sort of similar to what I have for my red lathe. But I am a bit puzzled.
You mention an over-centre device, presumably to lock it in position,  but I don't see it.

Just how does it work.

I know, I know, Must be thick as a brick. Put it down to the cold weather.

Dave. :doh:

vtsteam:
No problem David, it's not obvious at all from those pix.  I'll post some photos this evening. But It's straight out of David Gingery's little paperback on building the lathe.

You pull the handle forward to unlock and change belts, push it back to lock and tension belts. There's a small pair of links that do the over-center trick.

It's extremely handy having a clutch on the spindle at times, and that along with the crank on the leadscrew are two things I missed greatly when I started using the Craftsman 12" lathe after the Gingery. I found the rack and pinion traverse on the Craftsman very clumsy -- it isn't fast enough when you want to move the carriage out of the way -- especially on a long bed, and too coarse (fast) to put on a fine cut. It doesn't do either thing well.

The Gingery lathe handles fast traverse by simply unlocking the half nut and sliding the carriage by hand along the ways. This is easy and fast on a small lathe -- just like sliding the tailstock. Once you engage the half nut, you have a nice 16 to 1 turn rate on the leadscrew crank, which can give you an easily controlled fine cut. Sometimes cruder is better!

vtsteam:
The shop has been very usable in the cold weather so far, but tomorrow will be a real test. We have -26C predicted tonight with winds up to 30 kmh, wind chill as low as -32 C. Not unusual for this time of year, but I'm definitely looking forward to warmer weather!

Looking at my last post, I promised to get a picture of the over-center drive lock -- which I forgot to do. Sorry, will do that this evening. And give you a climate report inside the tiny shed!

DavidA:
Just hoping that the predicted winds (70 - 100 mph,  probably neared 70 where I live)  over the next couple of days don't damage my shed or greenhouse.

Dave.

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