hoglet cam help

[ozzie46]

I have been pouring over all the reference material I can find on making cams, both in print and web based. I can't seem to be able to determine how to make the hoglet cams. I want to make them on the lathe as I don't have a good boring head for my mill.

The cam blank is .465 with a base circle radius of .168.
with a cam lift of .065.
I think I have figured out the off set for turning the cam as .232 offset.

I can't seem to figure out the opening and closing duration for the lobes. I think that is what I need.

I have read Steve Hucks "Offset turning the cam shaft"
tutorial till I'm blue in the face and I still don't know what to do.

The 3 lobes are located around the shaft thus: 1 lobe at "0"
degrees, 1 lobe at "101" degrees counterclockwise from "0"
and 1 at "113" degrees from "0" clockwise.
Thanks in advance.


Ron

 

[hedgehog]

Any luck with the cam Ron? I have to build one soon too and dont know where the start

 

[Jasonb]

Hedgehog have a look at the recent thread on cam cutting where the boring head method was described. Or do you also want to use the lathe?

http://www.homemodelenginemachinist.com/showthread.php?t=23303

As for getting the angle just draw it out it CAD or if you don't have that try it at 10 times larger on a bit of paper.

 

[barnesrickw]

Just the Venn diagram looking picture explained how to cut a cam very well for me. Starting to think a four stroke my be possible for me.


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