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 Post subject: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 1:19 pm 
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Joined: Sun Sep 20, 2009 8:36 am
Posts: 40
Has anyone done any camshaft milling on a 4th axis?
I have 30mm stock round bar and need to mill camshaft journals 10mm dia and 10mm offset from centre.
My plan is to use and endmill on centreline and mill by moving the Z up and down and rotating the part !! (sounds easy) !!
I have done 4th axis work previously by wrapping curves etc but cant seem to find a way to do this.

Any help would be great


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 2:47 pm 
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Joined: Thu Jan 25, 2007 7:01 pm
Posts: 134
Location: USA
Since you want to keep the tool in a static Y position then it sounds like the Four Axis Rotary finishing strategy would work for you. Give that one a shot.

Good luck!

Marshall


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 3:27 pm 
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Joined: Sun Sep 20, 2009 8:36 am
Posts: 40
Hi,
Thanks for the reply, sorry but what is a " 4 axis rotary finishing strategy"??


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 4:14 pm 
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Joined: Fri Sep 16, 2011 5:48 pm
Posts: 98
Location: S.F. Bay Area
It's a 3d milling toolpath option


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 5:06 pm 
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Joined: Sun Sep 20, 2009 8:36 am
Posts: 40
Hi,

Tried that without much luck. The principle works but its only a finishing strategy. Any ideas how to rough and finish a better way?


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 7:06 pm 
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Joined: Fri Sep 16, 2011 5:48 pm
Posts: 98
Location: S.F. Bay Area
use parallel roughing from 4 sides at 90 degree increments ( set max z depth to just less than centerline ), then use the rotary 4th axis to finish


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 7:34 pm 
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Joined: Tue Jan 23, 2007 1:51 pm
Posts: 88
Location: Orange County, NY
I have done this in the past. Do you have a point set (height @ angle) or chart to work from? If there are flat ramps on the cam it could be a little more involved. You also will need to use a flat end or square cut end mill.

Russ F. ,out

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FC V1.0 to Pres., 3D Mill, Turning, 5 axis pos. & simo, Machine Sim. and tumestone and Solidworks Pro., Haas UMC 750


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 7:39 pm 
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Joined: Sun Sep 20, 2009 8:36 am
Posts: 40
Hi,

Better but still not great, cutter wants to go into the side walls rather that just a straight finish.

This is what i am trying to replicate.

http://www.stevenson-engineers.co.uk/files/crank1.jpg


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Mon Mar 04, 2013 7:41 pm 
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Joined: Sun Sep 20, 2009 8:36 am
Posts: 40
Hi

This is all the info i have:

the part:

Crankshaft with pin of 10mm diameter and the spacing between webs of 8mm.
7 journals @ 180 to each other. webs are 30mm in diameter.

Start the job with a 30mm diameter steel bar.


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 Post subject: Re: Camshaft milling on 4th Axis
PostPosted: Tue Mar 05, 2013 12:38 am 
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Joined: Tue Jan 23, 2007 1:51 pm
Posts: 88
Location: Orange County, NY
Visualize your tool making a full circle on the YZ plan at the same time part is being rotated one rev. They both must rotate in the direction.

With the center of the shaft being Y0.0, Z0.0 , Your finish cut should look sometime like this.

I was able to get FM to out put the XYZ moves, but had to MDI the Rotary .

N27 Z100.0

N28 G0 C0.

N29 G0 G54 X0. Y50.00 M8 ( X WILL BE THE CENTER OF THE CAM )

N30 Z16.0

N31 G1 Z10.0 F13.3

N31 G1 Y.0

N32 G19 Y5.0 Z5.0 J0. K5.0 C90.0 F26.6

N33 G19 Y0. Z0.0 J0. K5.0 C180.0

N34 G19 Y-5.0 Z5.0 J0. K5.0 C270.0

N35 G19 Y0. Z10. J0. K5.0 C360.0

N355 G1 Y-50.0

N36 G0 Z100.0

N37M9

N38M5

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LIFE IS GOOD!!!!

FC V1.0 to Pres., 3D Mill, Turning, 5 axis pos. & simo, Machine Sim. and tumestone and Solidworks Pro., Haas UMC 750


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