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Most CNC programs don't evolve as quickly as port designs do. Meaning that "trick" CNC porting job you get, may be a 5 year old program...................BUT, there is nothing wrong with that. I still buy CNC ported heads and then send them to "my guy" to fix them. The added cost of the CNC porting is usually less than having bare castings done completely by hand.

Monte

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I love my job. I love technology period. In our "racing life" we don't use it to its potential IMO.
That's why I started this post was to find out who is leading the way on the CNC side of things.

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Hand porting and porters is becoming a "lost art". CNC programers copy and use a hand ported head as a blueprint good or bad. I reworked a set of AFR cnc'd chevy heads that weren't worth crap and WAY off their advertized flow numbers. Hand porting is NOT easy work.

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yes you can start with ports on a head that have been digitized. Then use that digitized model as your "blueprint".
A good machinist/programmer will go in and alter that model to make it better. Then keeps changing it as the data comes in and logs the data to what works and doesn't to better the head.

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Modern Cylinder Head gets my business.

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What type of heads do you have them do?

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FHO has a pretty good Hemi program.

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They did my stage V big valve hemi heads.

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yes you can start with ports on a head that have been digitized. Then use that digitized model as your "blueprint".
A good machinist/programmer will go in and alter that model to make it better. Then keeps changing it as the data comes in and logs the data to what works and doesn't to better the head.

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yes you can start with ports on a head that have been digitized. Then use that digitized model as your "blueprint".
A good machinist/programmer will go in and alter that model to make it better. Then keeps changing it as the data comes in and logs the data to what works and doesn't to better the head.

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My exposure to digitized/3D scanned parts begins as a point cloud file that is then converted to surfaces. My life would be much easier if I had CNC machinists that were skilled enough to modify surface data. Guys like you are few and far between.

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I don't care how good of a programer you may or may not be nothing replaces flow bench and track testing.

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totally

But with the proper feedback and the right machinist and or programmer it would be darn close right off the machine.

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I don't care how good of a programer you may or may not be nothing replaces flow bench and track testing.

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totally

But with the proper feedback and the right machinist and or programmer it would be darn close right off the machine.

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We get it: you REALLY like CNC porting.

You don't seem to get it: CNC ain't sh!t if the original hand-carved port isn't right.

It's funny to hear over on SpeedTalk how the guys that do port development go to PRI, etc., and see all these pretty CNC-ported heads that have crappy port & chamber designs... but they LOOK good!

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I don't care how good of a programer you may or may not be nothing replaces flow bench and track testing.

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totally

But with the proper feedback and the right machinist and or programmer it would be darn close right off the machine.

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I don't care how good of a programer you may or may not be nothing replaces flow bench and track testing.

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totally

But with the proper feedback and the right machinist and or programmer it would be darn close right off the machine.

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Are you using a CAD or CAM software for surface modification? If CAM which one? Just curious how you do surfaces with the majority of them (especially a port) being not true geometry.
As far as most CNC porting shops, the way I understand it is they take one hand ported intake and exhaust port (could be great, could be crap)have it scanned and then pattern and mirror it for the head. Doubt they have a CAD user who can manipulate the model to counteract core shift. Maybe Modern can chime in on this.

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I personally own and use my software's at the place I work at. They are SolidWorks and CamWorks. I feel they are great softwares together. FWIW, CP Pistons also uses CamWorks for their stuff too.
But also to counteract core shift, you need to know if it is shifted in the first place and how much and which way. If you're going full out on the porting, the head needs to be sonic checked or x-rayed first. Not just bolt the head down and push the cycle start button. IMO.
Yes, you do need to be able to counteract core shift by manipulating the solid model a bit. Also just MO.
But according to other people on this post, button pusher CNC guys like myself, aren't smart enough to fix a bad flowing port. Only a guy with a fast spinning piece of sandpaper on the end of a stick is. That's other peoples opinion

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... But according to other people on this post, button pusher CNC guys like myself, aren't smart enough to fix a bad flowing port. Only a guy with a fast spinning piece of sandpaper on the end of a stick is. That's other peoples opinion

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If you have a flow bench, the proper tools to map the velocity changes that go along with subtle changes to the port, the knowledge of how & where to change the port to address deficiencies in the velocity profile & flow patterns AND the ability to translate those changes to the code to revise the tool path w/o having to physically change the original port and re-digitize it, then you're good to go!

I'll have to ask Chad Speier and Curtis Boggs how they like being referred to as "a guy with a fast spinning piece of sandpaper on the end of a stick".

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... But according to other people on this post, button pusher CNC guys like myself, aren't smart enough to fix a bad flowing port. Only a guy with a fast spinning piece of sandpaper on the end of a stick is. That's other peoples opinion

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If you have a flow bench, the proper tools to map the velocity changes that go along with subtle changes to the port, the knowledge of how & where to change the port to address deficiencies in the velocity profile & flow patterns AND the ability to translate those changes to the code to revise the tool path w/o having to physically change the original port and re-digitize it, then you're good to go!

I'll have to ask Chad Speier and Curtis Boggs how they like being referred to as "a guy with a fast spinning piece of sandpaper on the end of a stick".

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