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Author Topic: Cylinder Heads  (Read 183357 times)

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Offline BR549

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Re: Cylinder Heads
« Reply #20 on: July 06, 2010, 10:44:35 PM »
Steve do you have a 4th axis for your mill?  Cranks and Cams are fairly easy with a 4th. You can turn the blanks in the lathe to rough out and do all the offset work with the 4th. In bigger stuf we used round for the blanks to save time then did all the work on the mill and 4th
« Last Edit: July 06, 2010, 10:46:48 PM by BR549 »
Re: Cylinder Heads
« Reply #21 on: July 06, 2010, 11:06:32 PM »
Steve ,
if the cam lobes are individual pcs. soldered on a shaft , then why not do the lobe profiles on the mill. Bore the shaft hole first , and clamp thru the bore to hold , and machine the profile. Lot faster.
Ed VanEss

Offline Chris.Botha

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Re: Cylinder Heads
« Reply #22 on: July 07, 2010, 03:28:59 AM »
wow! cool project!
Re: Cylinder Heads
« Reply #23 on: July 07, 2010, 06:53:55 PM »
Steve do you have a 4th axis for your mill?  Cranks and Cams are fairly easy with a 4th. You can turn the blanks in the lathe to rough out and do all the offset work with the 4th. In bigger stuf we used round for the blanks to save time then did all the work on the mill and 4th


No 4th axis.  I could probibly cut the one off piece in less time as it would take for me to figure out the Gcode.  I'm getting by with Lcam and cant figure out cam bam or any of the other cam programs. I'm fresh out of 30 day trials.
Re: Cylinder Heads
« Reply #24 on: July 07, 2010, 06:57:04 PM »
Steve ,
if the cam lobes are individual pcs. soldered on a shaft , then why not do the lobe profiles on the mill. Bore the shaft hole first , and clamp thru the bore to hold , and machine the profile. Lot faster.

Not faster if you want a radiused flank. I am not a fan of flat flank camshafts. With the curved flank i am able to run a flat bottom lifter. If i mill a flat flank, i have to make roller lifters. They are fine for low RPM engines with a ball nosed lofter.

Offline BR549

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Re: Cylinder Heads
« Reply #25 on: July 07, 2010, 09:03:29 PM »
Steve we have run flat lobed cams and flat lifters well over 11k rpms in race engines.
Re: Cylinder Heads
« Reply #26 on: July 07, 2010, 09:34:38 PM »
Steve we have run flat lobed cams and flat lifters well over 11k rpms in race engines.

How do you keep the edge of the lifter from digging into the cam lobe? something needs to be curved or the edge of the lifter will meet the cam lobe and gouge the surface.

Offline BR549

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Re: Cylinder Heads
« Reply #27 on: July 07, 2010, 10:00:58 PM »
(;-) The design prevents the lifter from digging in. Your lobe must be correctly designed to run with your lifter. The curve is the actual ramp of the lobe. You can run right up to the edge of the lifter with the ramp design without problems. Over at the Andrews cam software you can download a free simple design program to design the lobe to fit properly. Also the trick is to design a constant velocity lobe but that is another story. (;-)
Re: Cylinder Heads
« Reply #28 on: July 07, 2010, 10:57:14 PM »

Steve we have run flat lobed cams and flat lifters well over 11k rpms in race engines.




[/quote]

My thoughts, Exactly.
Ed VanEss

Offline BR549

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Re: Cylinder Heads
« Reply #29 on: July 08, 2010, 10:54:24 AM »
Ed does have a good Idea to do the lobes and then silver soldered or braze them to the shaft them to the shaft. Without a 4th that would be a good option (;-)