2016 POTD Thread Archive

Finally got to do something in the shop, other than work on the new shop. My son is a physics teacher in Denver and brought up a school project for me to help with. It's a bicycle that turns left when you turn the handlebars to the right and vice versa. Used the old Atlas to turn alignment dowels for the gears and welded it up. Everything came out straight and true. Please ignore the welds as they are truly awful. My back was killing me and I didn't bother to change the settings from the last time when I was welding 1/4" plate, single pass. The bike is almost impossible to ride, and if you do figure it out, when you get on a regular bike you can't ride it. Would be kind of fun to leave it in a bad neighborhood and watch the fun. Cheers, Mike
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ebgb68 said:
Not a machining project but this will get all the lawn equipment out of the shop.

A friend was selling a shed on Craigslist but because it was over 12 foot No one would touch it. He was thinking about tearing it down. I live four miles down the road , was in need and hate to hear " it can't be done".
I found a cheap torsion axle widened it to 14.5 feet and installed a tongue. It was heavier than I thought bending the axle and tongue so we cut holes in the floor and strapped them up.
The looks on people's faces when a 12x14x13 building moving is priceless.
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Too bad you wasn't trying that around here. Local cops would have had every cop for miles around to escort you to your house and made a parade out of it. :grin:
Would have been something exciting to do for them.
 
The other day I posted about the PVC bushings I am making for a customer: http://www.hobby-machinist.com/thre...in-your-shop-today.14637/page-277#post-425712

They came out fine so far. I wound up doing the corner rounding operation by hand on my router table, cut the time down on that part of the operation from about 1 minute to about 10 seconds per piece. Don't know why I didn't think of that in the first place.:confused:

There is one more operation I need to do. The bushings need to be split with a cut that is tangent to the ID. My original intent was to do this by hand on the bandsaw. Unfortunately the results were not satisfactory so I had to come up with a better plan.:eagerness:

It turns out that Harbor Freight has a little tiny chop saw that has a 2 inch blade on it. The chop saw is not useful to me, but the blades are, and they sell 3 packs of replacement blades. The blades are 2 inch dia, and 0.027 thick, made of M2 HSS, or so the package says. Nice little slitting saws, about $10 for a 3 pack.:) And a 2 inch diameter blade will just reach deep enough to do the job.

So how to hang onto and locate the parts while slitting? So here's what I came up with, a set of really soft jaws for the mill vice made of MDF. Since I only have 100 pieces to do, a temp MDF fixture will be fine. The groove locates the part and keeps it from collapsing onto the saw blade while making the cut. The PVC wants to spring inward when cut. The part fits snug in the groove and is forced to hold its shape. The parts also sit flush with the bottom of the vice to make loading easier.

This operation is relocating the bolt holes because I'm an idiot.:mad: Kurt vice bolt holes are 0.9375 from the BOTTOM, not the top.:faint:
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And this is the setup. I haven't tried it yet, I finished the fixture up at about 22:00 this evening so I'll get a fresh start on it in the morning, after I've had my first 1/2 gallon of coffee :grin:. This is the time of night that I start making stupid mistakes.:cautious:

I expect about 1 minute cycle time for the 2 parts in this setup, so with knocking off 2 minutes per part with some program changes on the first operation, it brings the total time per part to just over 5 minutes. Yeah, I can live with that:) Of course I'm not counting the setup time in the total.:rolleyes:

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FOMOGO said:
Finally got to do something in the shop, other than work on the new shop. My son is a physics teacher in Denver and brought up a school project for me to help with. It's a bicycle that turns left when you turn the handlebars to the right and vice versa. Used the old Atlas to turn alignment dowels for the gears and welded it up. Everything came out straight and true. Please ignore the welds as they are truly awful. My back was killing me and I didn't bother to change the settings from the last time when I was welding 1/4" plate, single pass. The bike is almost impossible to ride, and if you do figure it out, when you get on a regular bike you can't ride it. Would be kind of fun to leave it in a bad neighborhood and watch the fun. Cheers, Mike
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That's an easy one to drive ...

Just cross your hands and hold the left handle bar with your right hand and vice versa.

Nice idea though...
 
Might well be the only bike in the world that's easier to ride no-hands!
 
Quote:
That's an easy one to drive ...
Just cross your hands and hold the left handle bar with your right hand and vice versa.
Nice idea though...

Nope, that doesn't work. Mike
 
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FOMOGO said:
Finally got to do something in the shop, other than work on the new shop. My son is a physics teacher in Denver and brought up a school project for me to help with. It's a bicycle that turns left when you turn the handlebars to the right and vice versa. Used the old Atlas to turn alignment dowels for the gears and welded it up. Everything came out straight and true. Please ignore the welds as they are truly awful. My back was killing me and I didn't bother to change the settings from the last time when I was welding 1/4" plate, single pass. The bike is almost impossible to ride, and if you do figure it out, when you get on a regular bike you can't ride it. Would be kind of fun to leave it in a bad neighborhood and watch the fun. Cheers, Mike
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Welds to fine to my Mike, reminds me of my work . . . If they hold, they're fine. Great job!

Bruce
 
Watched a youtube video of someone that made a bike like that Mike. He spent weeks learning to drive it but his young kid could jump on it and go. Its mostly conditioning.

Greg
 
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