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Here is another way to look at it. If we take a simple solid flywheel disk of mass m and radius r we have a moment of inertia as mentioned: I = m * r^2 /2 Now lets cut a small disk of radius k*r out of the center of that flywheel where k is a number between 0 and 1. For example if our small...

I have never sharppened carbided drill bits with it but I use it all the time to sharpen those cheap chinese boring bars that I sometimes use. I just take the cover of the DD and stick the boaring bar into the small diamond wheel. I have sharpened about 35 boring bars with it several times and...

George - I have also used your stick fonts. They are great. Thanks for giving them to the world.

Maverik that is a great looking tool. I have a few questions if you don't mind. 1) What (if anything) stops the plunger from turning? 2) What is the purpose of the little ledge shown on the left half of the pluger? 3) What is the purpose of the shallow slot seen on the right hand side of the...

Yep that sure helps. Perfectly clear now. But now I wonder why I would want 45 degree instead of 90 degree. I wouldn't be able to turn to a shoulder. What is the advantage of the 45 degree angle?

Thanks for the pics. I have seen those before and I don't see any angle that looks like 45 degrees so that is why I am asking.

When someone talks about a 45 degree face mill what angle does the 45 degree refer to?

Valenite boring bar, .750" diameter, 14" overall length Carbide shank SCLPR-12H-325 RIGI-DEX(R) CP-32.5 PT-559T Used - in great shape $100 Valenite boring bar, .625" diameter, 11.5" overall length Carbide shank SCLPR-10H-215 RIGI-DEX Used - in great shape CP-21.5 PT-589T $80 1.0000" inch...

Nice job, What material did you use? What size tap did you use?

Not too far from me. What is the name of the dealer?

I love it! Would love to see it built.

Does this make sense?

Very interesting. Made me think ... suppose you used the setup as metioned for step 1 and then for step 2 instead of using the other edge of the square you placed a flat surface against the edge you just checked (a 1-2-3 block or parallel) then checked against the back side of that. This way it...

Very nice! I have thought about making exactly the same thing. I wasn't sure about what steel to use. I didn't thing the threads would be strong enough using just plain old cold rolled - those screws need to be tight.

Hey Bob - I love the conversion. I am wondering why the motors are geared down so much. Most of the direct coupled stepper systems use around 400 0z-in motors. You are using around 800 oz-in servos and gearing down by what looks like abour 3:1 giving about 2400 oz-in torque to the lead screws (I...

Can you buy some kind of liquid acrylic that can be poured into a mold? The kind of stuff that some trophies are made from?

Mine works great just like the others have said. It was certainly worth the money I paid for it.

I am trying to get together the materials to build a stirling engine. I have stainless steel for the power cylinder and graphite for the piston. Any ideas for lapping compound? I don't know much about it. Remember I live in Canada.

The original poster is loving it. I would love to build something like that. I dont suppose you have any drawings?

I have a C6 lathe which has an MT4 spindle bore. I also have an X3 mill that has an R8 spindle. I often wish I had a collet system for my lathe, mostly because I want to be able to hold parts without marking them. Is there such a thing as an adapter that would alow me to use R8 collets in my...