Milling a camshaft (with EMC2)

Milling a camshaft. In this demo, I have set the angular increment to 4°. 2° give much smoother results.

Parameters were:
Radius base circle: 8.5 mm;
Timing angle: 140°;
Tip radius: 3 mm;
Lift: 4 mm.

Done with EMC2 on a MAHO 700 C and a closed loop rotary axis

Category:

Science & Technology

Tags:

• camshaft
• lobe
• milling
• machining
• MAHO
• 700
• EMC
• EMC2
• rotary
• axis

[dantheman1998]

If you wanted to, could you run the cam straight from the mill without grinding it?

[MuellerNick]

@dantheman1998

It depends! :-)

For a model engine, it is good enough after some emery paper. A "real" engine's cam should be hardened and the lobe finished with emery. But for a high performance engine, it's only good for roughing before finishing the cam on a cam grinder.

[YoungJim409]

Well done!  The program seems to have very little wasted motion.

[MuellerNick]

@YoungJim409

Yes, I'm calculating the minimum travel necessary to cover each facet. Only when milling the chest (part between tip and base circle) there is left some place for improvement worth looking at. I later found that this section is way easier to calculate than I initially thought.

Basically, I just move 0.5 mm out of the cut.

[petsatcom]

Thanks Nick, Did you build the 4th Axis yourself? And I do like the scraping videos.

[MuellerNick]

@petsatcom

It is a modified (by me) 150 mm Vertex. Longer shaft of the rotary table, better axial needle bearing for that shaft, added rotary encoder, support angle on the back (welded structure at the left), motor mount with coupler.

[FraeserFreak]

It is very schee wos you do gmochts has :-P

Schene grüas vom Bene gfrei me scho aufn Stammtisch

[MuellerNick]

@TheEgoblitz

All of it, you are right! :-)

Yes, I increased feed for this demo, the mill is not a perfect choice. I just wanted to show the process. The part will see the scrap bin soon.

[TheEgoblitz]

Very nice but it looks like your tool is too small and dull or the feed is too high if that is steel. Thumbs up though!

[MuellerNick]

@TheDaumen

No, not for you! :-)

It only works with a CNC, so it has no use for you. Sir John's is the best fit for your needs.