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Author Topic: Cylinder Heads  (Read 183372 times)

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Offline BR549

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Re: Cylinder Heads
« Reply #230 on: June 20, 2011, 11:26:01 PM »
I have been working on a CNC Cam and Crank grinder function for MACH3 AND SheetCam. iF you had the lift points for the cam lobes it would take about 15 minutes or less  to complete the Gcode.

You can collect the lift data by probing A cam in the grinder. Then transfer those lift points A/Z into a DXF drawing then Use SheetCam to translate the drawing into a A/Z plane gcode program that is compensated for the Grinder Wheel radius.

Once you have a Gcode program it is ALL about making as many as you want. Load the blank press the GO button and go about your business. When the cam is complete remove from machine.

It will even do CROSSOVER grinding of PAIRS (int/exh) of lobes alternating between lobes for each pass to help control THERMAL buildup.

IT WILL ALSO do the offset grinding for the Crank pin journals as well as the main journals. SAME basic procees right down to COPYING a crankshaft. Probe the rod journals in the grinder then transfer the data out to a DXF drawing. Into SC and back to mach3 for ginding. IT can even grind a crank from billet if you chose to.  Best to rough it out first to save grinding time.

Just a thought, (;-)TP
« Last Edit: June 20, 2011, 11:38:18 PM by BR549 »

Offline BR549

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Re: Cylinder Heads
« Reply #231 on: June 21, 2011, 01:38:50 AM »
Steve about how long does it take to produce a camshaft ? Crankshaft?

Just curious,(;-) TP
Re: Cylinder Heads
« Reply #232 on: June 21, 2011, 04:30:30 PM »
Steve about how long does it take to produce a camshaft ? Crankshaft?

Just curious,(;-) TP

1 hour to make the fixture
1/2 hour to machine the blank
3 hours to machine all the lobes

Crankshaft was about 6 hours start to finish.

Offline BR549

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Re: Cylinder Heads
« Reply #233 on: June 21, 2011, 06:37:47 PM »
Steve what is the basic spec on the lobe BaseCircle ? Lift?   firing order   I would like to model a basic cam like yours and see how it works in CNC.

(;-) TP
Re: Cylinder Heads
« Reply #234 on: June 21, 2011, 09:53:30 PM »
Steve what is the basic spec on the lobe BaseCircle ? Lift?   firing order   I would like to model a basic cam like yours and see how it works in CNC.

(;-) TP


Base circle = .350
Flank Radius = .696
Nose Radius = .125
Lift = .070
Duration = 280/280 degrees (140 cam degrees)
Lobe seperation = 110
Firing order = 1,8,4,3,6,5,7,2

Offline BR549

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Re: Cylinder Heads
« Reply #235 on: June 21, 2011, 10:11:25 PM »
Thanks Steve, Ill give it a try in simulation to see what it looks like.

(;-) TP

Offline BR549

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Re: Cylinder Heads
« Reply #236 on: June 21, 2011, 10:32:26 PM »
Hey Stece could you check the lift numer again. It does not look like the cam lobes in your picture(;-)

(;-) TP
Re: Cylinder Heads
« Reply #237 on: June 22, 2011, 04:42:23 PM »
Hey Stece could you check the lift numer again. It does not look like the cam lobes in your picture(;-)

(;-) TP

.070 Lift

That's what I designed and it looks alot like my model. Maybe the flank radius is throwing you a curve ball.
Re: Cylinder Heads
« Reply #238 on: July 03, 2011, 10:06:06 AM »
Well I have had 2 people tell me they have completely modeled the engine and one more who has only a few pieces to go. They have reported the same missing dimension on the head. Other than that I think I'm out of the woods on the drawings. I don't see them changing much after this one update. The fact that it could be drawn by 3 people makes me believe there is enough info to build to completion. The plans have been updated to version 1.01. I'm going to wait a few weeks to see if anything else pops up and send out a fresh set to those who have purchased already.

Other than that i'm going to stick to the original plan of finishing the V8 project and then finishing the blower conversion. Hopefully I'll get back at it next week!!!

If interested, plans can be purchased for this engine.

Offline Tweakie.CNC

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Re: Cylinder Heads
« Reply #239 on: July 03, 2011, 11:07:51 AM »
Such a wonderful job you have made of this project Steve I hope you have many takers for the plans. (shame you can't sell the ability as well as the plans).

Tweakie.
PEACE