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Haha Gus, I've seen so many examples of 41 tooth worm gears and 71 tooth worm gears online that I was scared to try hobbing a worm wheel with a tap! That's why I looked for a good deal on one on eBay. It looks like I'll be taking my lead from your example and hobbing my own worm wheels from now...

So, I won an auction on eBay for a couple of big brass/bronze worm wheels. They're about 3.25" in diameter, being about 11/16" wide at the teeth, and have 3/16" deep bosses on either side. Really lovely, really, and got 'em for quite a deal. One looks new and the other has a bit of wear. The...

Just wanted to let everyone who's offered advice know that I haven't given up! I've spent far too much time reading about approximate and exact straight line linkages, four bar linkages, six bar linkages, kinematics, etc. I've spent just as much time playing with different multi-body simulation...

The machine Mr. Romig designed has a maximum stroke of 4 inches, that was a pretty good guess! I never considered a roller cam, but I don't see how I could adjust the length of stroke with a roller cam operating directly on the ram. I could take your idea a bit further, though, and turn the...

Ahh, thank you Jimmyjo! I could tell that the short 3.5" link was what allowed the long 10" link to drive the ram straight up and down, but wasn't sure exactly what factors defined its length. I did stumble across several references of crank and slider mechanisms, yet I was still stuck looking...

I'm a lurker on this forum, and I need help identifying a linkage system so that I can design a similar one. The picture is from J.V. Romig's article, "Making a Four-Inch Bench Slotter" and is the side view of his designed slotter. I'm interested in the mechanism that turns rotary motion into...

Those 4 strokes with the sensor and magnet on the crank do create a spark on both TDC before the power stroke and TDC before the intake stroke. And it's not really a problem. In one case, you've got a spark that ignites a fuel rich mixture like we want. In the other case, we get a spark in a...

I'll try to post pictures of the things I'm working on, I do know how much I love to look at other people's pictures. I'm much more the type of person to research a problem before asking a question, even though asking the question first would be a lot quicker. Some of my favorite pictures are of...

Hey y'all. After reading around this messageboard for a while, I thought it might be time for me to create an account. My name's Duncan, I'm from Scott, Louisiana, and I've got a very small lathe at home (Taig). I've always loved building things, and earlier this year finally took the plunge and...