Thank you! More videos are definitely coming. I still have much to learn.

That's cool. We also run a wood-cutting CNC router in the woodshop. I'll admit that's where I got the idea for this video. We're in the middle of using a micro-controller to make a manual pulse generator (MGP) for the router. It's an interesting project. I definitely need glasses and a magnifying glass to see well enough to solder those tiny pins.

Thanks

The accuracy (or lack of) was my fault. The numbers I got were due to my speeds and feeds and the deflection in the small endmill I was using. All of my measurements were one and done, meaning I ran the part once, and then measured. I learned that I need to be more thoughtful when programming small bores. Recently, I had to hit a number on an internal bore to allow a sliding fit. I didn't his the number on my first try, but after a couple of spring passes I hit my tolerance. On the bright side, at least it's not milling too much material. I think it's reasonable to account for deflection by running a spring pass or adjusting wear using cutter compensation.

Calipers dont have a perfect knive edge. So you are basicly measuring with 4 points wich wil give you an smaller reading.

@@jankaas2760 That's a great point! Thank you

I'm much more familiar with the Syil now. My biggest mistake during this test piece was pushing the tool path too aggressively. The helical bore wasn't a bad strategy but I think my final contour path was too aggressive and my endmill deflected. For better accuracy, I like to leave less on the walls for the finish pass and even follow up with a final spring pass. I programmed repeat passes on the square and diamond and the measurements were better.

​@@PowerForgeWorkshop I use gwizard calculator, it calculates the deflection

@@dancollins1012 Cool, I'll check it out.

​@@PowerForgeWorkshop A lot of people, especially when first getting into CNC programming, don't realize there is a conversion that needs to be done for circular interpolation especially when dealing with bores. Some CAM software and machines can do the compensations for it, but a lot don't, so the feed rates people normally post out are much higher than they should be. There is a multiplier you need to apply to the feed rates: (Diameter you're cutting - tool diameter ) / (Tool diameter) Example: Cutting .375 inch bore with a 4 flute 1/4" tool (RPM at 3000, chip load per tooth of .001) Linear feed rate: 3000(RPM)*.001(chip load)*4(# of flutes) = 12 inches per minute Circular feed adjustment: (.375-.250)/(.375) = 1/3 Adjusted feed rate = 12*(1/3) = 4 inches per minute

@@adriand.896 Awesome! Thanks, I'll put that in my tool box for future use. I already have your comment copied to a word doc.