Excellent video, well explained. I have been programming CNC's for over 40 years, mainly in the aero space, marine environment, I would like to say, that vacating the chips out of the pocket important, if they remain in the pocket they will increase the loading on the tool.
CNC milling steel is nearly always programmed using "climb milling" technique for better tool wear and material removal. Is climb milling applicable to wood?
Wood work is generally the opposite, “conventional milling” direction would usually leave a better finish on wood, especially on long grain. Also because routers are generally less rigid and spanning larger areas than a steel milling machine, climb milling can often cause machine deflection. Climb is sometimes preferable though especially in more fragile grain instances to reduce break out. I use climb milling when post bevelling boat frames for example 👍
Well explained Dan. I have used both hobby and industrial machines and it is a minefield. A lot of the time your ears are the best guide. On the big Format4 machine 99% of the cuts were climb. It I was having to use a stepped cut it would be 1mm out side the part size then make a full depth cut on final size to clean the tool marks.
Hi Dan, nice! A good addition might be to add a max feed rate setting of the users machine. The calculator could then reduce the spindle speed if the feed rate can’t be matched?
i not can understand how make good right feed and speed because normal spindle can only be speed 10K-24K RPM ad feed not can decrease many cnc (diy CNC) more than about 1000-1200mm/mon. burn bit or not cut good chip ewer and drill bit burn alltime.
Thats a problematic combination, even at your best case scenario (10k spindle RPM and 1200mm/min feed rate, with a single flute cutter) you are still only half way to where you need to be for a recommended chip load, if you are cutting soft woods for example. I am guessing your feed rate is limited by the construction of your machine? What spindle are you using? In an ideal world you would source a spindle that can run at lower RPM's but the best you will get out of your machine using it's current setup would be using the combination I've just mentioned.
Excellent video, well explained.
I have been programming CNC's for over 40 years, mainly in the aero space, marine environment, I would like to say, that vacating the chips out of the pocket important, if they remain in the pocket they will increase the loading on the tool.
Recutting chips dulls bits faster than anything. With wood, multiple compressed air nozzles help. Makes a mess but keeps the tool clear.
@@MurraydeLues Working with metals and fully enclosed machines, liquid coolant was always the first choice.
CNC milling steel is nearly always programmed using "climb milling" technique for better tool wear and material removal. Is climb milling applicable to wood?
Wood work is generally the opposite, “conventional milling” direction would usually leave a better finish on wood, especially on long grain. Also because routers are generally less rigid and spanning larger areas than a steel milling machine, climb milling can often cause machine deflection. Climb is sometimes preferable though especially in more fragile grain instances to reduce break out. I use climb milling when post bevelling boat frames for example 👍
Great stuff Dan!
Thanks Panu 🙏
Well explained Dan. I have used both hobby and industrial machines and it is a minefield. A lot of the time your ears are the best guide. On the big Format4 machine 99% of the cuts were climb. It I was having to use a stepped cut it would be 1mm out side the part size then make a full depth cut on final size to clean the tool marks.
I do finishing passes quite a lot of the time as well, the finish you get when utilising that process is awesome!
Hi Dan, nice! A good addition might be to add a max feed rate setting of the users machine. The calculator could then reduce the spindle speed if the feed rate can’t be matched?
I'll see if I can factor that in. I'm sure this calculator will evolve over time to include more features.
Just a heads up the inch depth cut result does not seem to be working.
I've sorted that out now 👍
i not can understand how make good right feed and speed because normal spindle can only be speed 10K-24K RPM ad feed not can decrease many cnc (diy CNC) more than about 1000-1200mm/mon. burn bit or not cut good chip ewer and drill bit burn alltime.
Thats a problematic combination, even at your best case scenario (10k spindle RPM and 1200mm/min feed rate, with a single flute cutter) you are still only half way to where you need to be for a recommended chip load, if you are cutting soft woods for example. I am guessing your feed rate is limited by the construction of your machine? What spindle are you using? In an ideal world you would source a spindle that can run at lower RPM's but the best you will get out of your machine using it's current setup would be using the combination I've just mentioned.