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Old 03-22-2013, 08:39 PM
jaysengines
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Default crank shaft and cam shaft

hi i am new here and need some help i would like to find out how to machine a carnk and cam on my 4th axis i use cut 2d to draw my parts and aspire for some 3d stuff my goal is to draw and machine my parts in aspire please let me know .... jay
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Old 03-23-2013, 06:00 AM
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Michael Mezalick Michael Mezalick is offline
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It's not that hard to do, just takes a bit of thinking and good layout.
AND very detailed information.
In Aspire just envision the cam shaft cut in two and flatened out. Then with the wrapping feature you can cut out the part.
Michael


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Originally Posted by jaysengines View Post
hi i am new here and need some help i would like to find out how to machine a carnk and cam on my 4th axis i use cut 2d to draw my parts and aspire for some 3d stuff my goal is to draw and machine my parts in aspire please let me know .... jay
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Last edited by Michael Mezalick; 03-23-2013 at 06:13 AM.
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Old 03-23-2013, 06:12 AM
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Michael Mezalick Michael Mezalick is offline
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Here's a quick example that I did.
Picture #1 shows the wrapped 3-D view
and picture #2 shows the same design but in a flattened 3-D view.
I hope this helps.
Michael
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File Type: jpg camshaft 1.JPG (72.6 KB, 191 views)
File Type: jpg camshaft 2.JPG (93.4 KB, 151 views)
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Old 03-23-2013, 07:12 AM
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One thing I'd consider here, you have no X motion here once you've lined up for cutting.

What I'm saying here is that as long as you can cut everything with A, Y, and Z, you're good, but if you also need to do some cutting with X this is the wrong software.

I'm especially concerned with the crankshaft. With the connecting rod offsets I'd think you'd have a lot of work n the sides of those lobes, if not for any other reason that to smooth them. You have rotary direction, front to back, and vertical motion because you're substituting A for X. You can't do any sideways work while in the wrapping process because there is no X.

One more thing I'd be concerned about with the crankshaft... You're going to need a very long tool in order to get to the lowest portions of the connecting rod lobe when it is at the bottom and not hit the sides.
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Old 03-23-2013, 07:50 AM
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Johnny,
You are correct as usual, It all depends on the design of the shaft that he is looking to make.
I was just showing what the wrapping feature can do.
He may need a 5 axis machine to do the most exacting work.
Michael
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Old 03-23-2013, 09:26 AM
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Michael, your work is amazing as always. I think he might even be able to cut your camshaft just using the AYZ if exact tolerances aren't the aim.

One question I'd ask is this. Jay, are you intending to make real cranks and cams this CNC machine or just models of them? If you're intending to mill out the real thing, that's beyond my experience.
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Old 03-24-2013, 05:24 PM
jaysengines
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Default wow

yes i plan to machines these parts out in my little mill i do have output for all 4 axis and the tooling i am very new to wrapping and makeing parts to lay in half the reason for me wanted to do this is to make a spare carnk and cam for a model engine i desined and bulit still try to get it to run its a inline flat head 9 called the j 8 may i ask for a step by step if its ok i can give you the sizes thanks for the help so far you guys are masters
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Old 03-24-2013, 06:25 PM
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Michael Mezalick Michael Mezalick is offline
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Jay,
You ask for a step by step of how to design a camshaft.
As you may know, every school, every learning environment, including the “School of Hard Knocks” has a price , a tuition of you will.
Many of us have spent countless hours learning the ins and outs of 3-D designing.
Many of us are willing to help, but here, I can only speak for myself, there are limits to showing.
I believe it is your responsibility to take the time and go down the road of 10,000 hours.
If you could be a bit more specific as to the bits and pieces of what you are looking for help on there may be some here how will help.
But it’s your project, share what you are looking for and we’ll see what we can do.
Michael
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Old 03-24-2013, 06:31 PM
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When I need a "Perfect" file I outsource it when it is over my head (Which is often) I have a lot of respect for a good modeler,,
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Old 03-24-2013, 06:45 PM
jaysengines
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sounds fair how do i draw the cam then lay it flat for wrapping and linking them from cam to cam or cams to cam bearing ? i have made my own conecting rods and parts in cut 2d and then i just flip them to get the part out ....jay
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