Thats really cool Dave!
Great job! :bow
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Thats really cool Dave!
Great job! :bow
Hows the job hunt going?
It's going ok I suppose... had four interviews this week (two of those were the 2nd interviews BTW :)).. So, we are just doing what we can in the meanwhile. Thanks for asking...
Now to answer some questions on the grinder... I would plan on making a permanent mount with a better shaft/bearing system in order to increase stability. But I really do think that it will be necessary to cast a flywheel to keep this sucker going for a grinding session.
Totally off the wall in keeping with the thread.
Why not use the rear part of a kids' bicycle to hold the wheels. Use the chain, sprockets, and pedals to drive it. Leave enough of the rest of the frame to cast into a concrete base using a ready mix type product?
I actually had designed something like this as an alternative, but I also wanted to test the treadle concept... either way, I really think you'd need to have a heavy flywheel to keep things turning.
The second interviews always made/made me feel like I have a good chance at it. I hope you knocked their socks off!
For a cheap heavy flywheel look into an exercise bike. I have made a lathe for a friend using a frewheel and a spring so the chain passes over the freewheel on the exercise flywheel then the end of the chain is attached to a treadle. The other end of the chain is attached to a door spring to spring the chain back for the next push. If i get to the other side of the state this summer I'll take a pic and send it your way.
Perfect, that would work really well. Thanks for the idea.
Dave
+1
~Richard
As my father always says to me, "Don't reinvent the wheel".
I go along with Geezer's approach to your question. Using parts of bicycle frames, chain drives and freewheels are probably a much better bet than what you now have.
For a bit of inspiration I give you the following links:
12 Knife Bikes
1940s/1950s Knife Sharpener Bicycle (Gundle?) « Museum of Tradesman’s Delivery Bikes
DIY gadgets in Africa: the knife-sharpening bicycle - Boing Boing
bicicletta dell'arrotino - knife-grinder's bicycle | Flickr - Photo Sharing!
KNIFE GRINDER (issue title SEE HOW THEY RUN) - British Pathe
YouTube - Afrigadget: A bicycle powered knife-sharpening machine
YouTube - Bicycle knife sharpening
Cheers,
- Ignatz