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L98, that is what happens in the code that Timo and I discussed above. By keeping all calculations as integers, and keeping up with the remainder, the code snippets Timo and I included above are guaranteed to come back to zero exactly. The "extra" steps will go in at regular intervals (as...

Oh yes, digitalWrite is very slow. I always bypass that with direct bit manipulation. Definitely not everyone's cup of tea. :)

Yes, that will work as well. That approach does not track the total steps to date, but rather calculates them, and from that calculates the steps needed for the given tooth. I had a couple of minutes free to work up the attached Excel sheet to show how my previous code would work, and as I was...

And as an added plug for changing it as you suggest - I find that older machine tools often varied slightly from the published manual, with changes having been implemented "between model years" as the manufacturer saw fit. So instead of an 1895 (or whatever year) model, just call it an 1895.5 ... :)

An old-fashioned solution is to keep some blocks of camphor in the drawers where you store the tools. I've never tried it, but supposedly the fumes leave a rust-preventative coating.

So the above post illustrates the problem; what is the solution? Let’s see if we can do everything with integers only. Note that even using long integers (64 bits) will be vastly faster on the typical 8-bit microcontroller such as in the basic Arduino. (Less of an advantage on a 32-bit ARM with...

If it ain't broke, don't fix it! :) But since I have a bit more time today, I'll sketch out below what I mean by using integers only - in case the need arises for either more speed or more accuracy in the future. First, let's illustrate the potential problem. Suppose you have a stepper motor...

I apologize that I have not read through the sample code thoroughly, but based on the last post above, here is a suggestion (coming from prior years of working in embedded systems): Don't use floating point at all. Instead, use two integers to hold the required ratio. IOW, work out the math on...

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Yikes! But in many places around the world, I have seen magnificent work done on even sketchier setups.

Thank you, sir. I have been keeping an eye out for a deal on this sort of saw for 15 years or so, and finally struck gold!

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Again, excellent observations, and I find myself persuaded by your reasoning. Not that that is anything to be too excited about, given my level of inexperience and ignorance! :)

Interesting observation! The molasses cores were to be baked in order to harden them - perhaps through caramelization (sp?) of the sugar? A sodium silicate core hardened via CO2 or catalyst wouldn't be baked to prepare the core, so the sugar would not caramelize at that point, but as you say...

I'm at the stage where at CM10 spark plug is about as small as I want to get. :) I had to look up VWPBL ... :)

Is the body mild steel, or also stainless? One thought that probably only exposes my ignorance: could you do a small relief cut at the top of the thread to avoid having to grind the die? Again, just amazing. I don't think I could pull this off, even with OptiVisors! I'd need a quart of tequila...

Right, the book talks about baking most if not all of these binders.

I have a .pdf copy of A Textbook of Elementary Foundry Practice, copyright 1910. It is fascinating to see what they talk about for cores - see the couple of pages I've attached. No mention of sodium silicate or epoxy; instead flour, rosin, linseed oil, glue, and molasses, along with some other...

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I fully understand. Many's the time I've spent multiple hours to recreate a $15 part, just because I have the tools and the material on hand. I always remind people that this is the difference between a professional machinist and a hobbyist - a hobbyist enjoys the journey, whether or not it...