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Unless their license specifies one build per plan purchase and a build has been attempted or completed.

How did you go about the cutting? I ask because it looks like there are several different 'lumps' on the cam. I would have thought the procedure would have gone something like: clamp the blank in the holder and take multiple passes until down to the base circle radius at that one point, then...

Great job and thanks for the files - they've jumped to the front of my 'to print' queue.

I should have given a bit more detail on my image. It is a biological structure taken at around 405 thousand times magnification. The brightest straight lines which run at about a 45 degree angle across the image have a diameter of roughly 50 nanometers (50 billionths of a metre) which is...

The offset from the centreline is just going to give your flank radius isn't it? You can have the fixture as large as you want and it shouldn't make any difference to the size you can cut the base circle to, but the further offset you have the 'gentler' the flank curve. I don't see why you...

Think yourself lucky that you live in the US and don't need to get anything shipped overseas from the US. Half the companies just refuse to sell to overseas customers and most of the ones that do want an absolute fortune for shipping. As an example, 2 oilseals 1/4" ID 1/2" OD (so could fit in a...

I've tapped 0-80 in aluminium a fair bit with standard tapping equipment. I make sure to start the tap using the drill chuck after drilling the hole and before moving the part.

Those SEM images are almost macroscopic. Molecule size is down to Angstroms and such a surface finish would never be achieved in practice. It's not of metal, but here's an SEM image that I took at a much higher resolution but which is still far above Angstrom sizes. Any guesses about what this...

I'll dig up a textbook from somewhere - I doubt much has changed from the 70's so your book is a good starting point. Thanks.

Have you got a reference or at least a name for the equations you're drawing these from so I can look them up? I'm stuck on hydro-static pressure where we certainly need to integrate over the surface given the change in head pressure with depth. It's going to be minuscule in something this size...

Pressure is force divided by area so if you increase the area of the seat you are reducing pressure on the seat. It's why someone stepping on your hand with a stiletto heel hurts more than when someone wearing sneakers steps on your hand (I really need to spend less time sprawled on the floor at...

I've done a tiny bit of chrome plating with a very similar setup to what you're using, but running the charge directly through the applicator 'brush' to apply the chrome solution. I chromed directly over my nickel plating attempt because the nickel looked slightly yellow and I wanted the chrome...

I think for it to be exact we would need to integrate over the entire curved surface but at the scale we're discussing it's overkill.

Calculating the area of a sphere is simple math (4*Pi*radius^2) then you just need to estimate the proportion of the sphere exposed to the fluid itself. Alternatively, I would think it'd be approximately close enough to just use the area of the inlet pipe and treat the sphere as flat (area of a...

Great first engine but I wouldn't recommend a flamelicker as your second. They can be very difficult to get running and many of them end up as paperweights even when attempted by seasoned machinists. But it can be done so if your heart is set on it then go for it! Good luck.

There is a benefit to a very small amount of pre-load on tapered rollers and angular contact bearings which extends load carrying ability and bearing life, and of course adds to the precision of the spindle. But the amount of preload is very small and the load capacity and bearing life drop off...

In a tapered roller bearing the rollers are 'wedge' shaped and when you install them statically the roller tends sit in the bottom of the raceway. When they are spun the rollers migrate their way to their actual running position further up the raceway and this increases the clearance within the...

I've never gotten around to making a ball turner but I do have a spare small boring head laying around - looks like another job on the to-do list.

You must live on the east coast - I pay about 29c a unit over here :(

I've never seen that method but it looks interesting. Nice idea.