Don Terrill’s Speed-Talk

econo racer wrote: ↑Mon Oct 14, 2019 7:47 am Has anyone ever looked at or tried running a set of CNC imported SBC heads?

rebelrouser wrote: ↑Tue Oct 15, 2019 12:44 pm Everybody talks about CNC heads, what usually I ask is, who did the original porting you are coping, or did you just tell the computer program to make them a certain percent larger? Just wondering why don't the sellers of CNC porting advertise who did the work the program is copying? Seems they might get more business? I port my own heads, I'm sure I leave HP on the table, but I just like the challenge of doing my own work. I have checked several CNC heads on my bench, most flow well, but the velocity is almost always a lot lower compared to the porting I do. And I just do a few engines a year so I don't claim to be an expert. Also seen some failures because the program takes out too much material, causing cracks and leakage as well.

midnightbluS10 wrote: ↑Tue Oct 15, 2019 5:54 pm

rebelrouser wrote: ↑Tue Oct 15, 2019 12:44 pm Everybody talks about CNC heads, what usually I ask is, who did the original porting you are coping, or did you just tell the computer program to make them a certain percent larger? Just wondering why don't the sellers of CNC porting advertise who did the work the program is copying? Seems they might get more business? I port my own heads, I'm sure I leave HP on the table, but I just like the challenge of doing my own work. I have checked several CNC heads on my bench, most flow well, but the velocity is almost always a lot lower compared to the porting I do. And I just do a few engines a year so I don't claim to be an expert. Also seen some failures because the program takes out too much material, causing cracks and leakage as well.

Tell the computer to make it a certain percentage larger? Are cnc machines now using AI to CNC? You can't just stick a head in, type in that you want this hole this much larger and let it work. That's not how cnc works. If there's a pattern to follow, someone programmed that pattern.

The cnc machine only executes motions that are programmed into the machine. And the whole "who are you copying" isn't a good question to ask. You ask who did the master that the program was based on.

midnightbluS10 wrote: ↑Tue Oct 15, 2019 5:54 pm

rebelrouser wrote: ↑Tue Oct 15, 2019 12:44 pm Everybody talks about CNC heads, what usually I ask is, who did the original porting you are coping, or did you just tell the computer program to make them a certain percent larger? Just wondering why don't the sellers of CNC porting advertise who did the work the program is copying? Seems they might get more business? I port my own heads, I'm sure I leave HP on the table, but I just like the challenge of doing my own work. I have checked several CNC heads on my bench, most flow well, but the velocity is almost always a lot lower compared to the porting I do. And I just do a few engines a year so I don't claim to be an expert. Also seen some failures because the program takes out too much material, causing cracks and leakage as well.

Tell the computer to make it a certain percentage larger? Are cnc machines now using AI to CNC? You can't just stick a head in, type in that you want this hole/port this much larger and let it work. That's not how cnc works. If there's a program to run, there's a pattern to follow, and someone programmed that pattern. No matter what it's doing. Someone programmed it to do that. You don't just stick parts in and tell it to arbitrarily a pick space and remove material of its own choosing, which is how you've explained it, it seems. It doesn't just take material out anywhere.

The cnc machine only executes motions that are programmed into the machine. And the whole "who are you copying" isn't a good question to ask. You ask who did the master that the program was based on. It sounds like you're trying to throw shade if you ask "who are you copying".

midnightbluS10 wrote: ↑Tue Oct 15, 2019 5:54 pm

rebelrouser wrote: ↑Tue Oct 15, 2019 12:44 pm Everybody talks about CNC heads, what usually I ask is, who did the original porting you are coping, or did you just tell the computer program to make them a certain percent larger? Just wondering why don't the sellers of CNC porting advertise who did the work the program is copying? Seems they might get more business? I port my own heads, I'm sure I leave HP on the table, but I just like the challenge of doing my own work. I have checked several CNC heads on my bench, most flow well, but the velocity is almost always a lot lower compared to the porting I do. And I just do a few engines a year so I don't claim to be an expert. Also seen some failures because the program takes out too much material, causing cracks and leakage as well.

Tell the computer to make it a certain percentage larger? Are cnc machines now using AI to CNC? You can't just stick a head in, type in that you want this hole/port this much larger and let it work. That's not how cnc works. If there's a program to run, there's a pattern to follow, and someone programmed that pattern. No matter what it's doing. Someone programmed it to do that. You don't just stick parts in and tell it to arbitrarily a pick space and remove material of its own choosing, which is how you've explained it, it seems. It doesn't just take material out anywhere.

The cnc machine only executes motions that are programmed into the machine. And the whole "who are you copying" isn't a good question to ask. You ask who did the master that the program was based on. It sounds like you're trying to throw shade if you ask "who are you copying".