All - I have been working on something with some help from the R7 group. Now I need your help as well.
This is for all the DIY CNC guys. How often have you tried a feeds and speeds calculator only to find that the results were less than desirable?
I want to create charts for those of us, a reference if you will that will get us a little closer to where we need to be feeds and speeds wise on our DIY hobby grade machines. The best place to start I believe is with feed back from you guys. Please provide as many references as you can in the google sheet linked here. At the end of the study I will release all the results on a blog with charts and graphs and hopefully we can help ourselves and the future guys get as close to that perfect cut as possible.
I’m guessing that stiffness varies widely across the hobby grade machines, and that this may make comparing feeds and speeds difficult.
Is there as simple way to measure stiffness at the bit? Perhaps with a fish scale and calipers? It would be really neat to see stiffness in X, Y, and Z for a bunch of hobby grade CNC mills.
@Matt_Wheeler Completely agree. So the thought I had on that is to plot (if enough data is provided) inputs in general column selections, such as wood/router/3.175mm end mill, and do a line fit to provide an idea. The “out-liers” will be picked up but only a small input into the total average. Not sure any of it will work… but have to start somewhere and feeds and speeds calculators based on the basic equations doesn’t seem to do it for anyone with DIY machines. This is based on a multitude of factors, mass, rigidity, etc. but maybe there is a relation…