Gallery, Projects and General > How do I??

Webster build issues

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John Rudd:
David,
I understood what you said, but my issue is in creating the profile...

seadog:
John, the cam profile, as you say, is not a simple eccentric, so cannot be made on a lathe unless you have a pattern and a profile turning attachment. Normally it would be ground on a specialised machine. Alternatively it could be made on a CNC mill.

Jasonb:
To make the cam turn the end of a bit of 3/4" bar down to 0.712" and drill & ream 0.375.

Set up the rotary table to hold the work, can be vertical or horizontal. Using say a 1/2" cutter bring it down until it touches the 0.712" dia and zero the Z axis handwheel or DRO.

Take a couple of passes at 0.025" depth of cut until you have removed 0.075" which will be the base radius of the cam and lock your head.

Now turn the rotary table say 2Deg (nothing too accurate 1/2 a turn of the handwheel) and make another pass over the cam blank

Keep rotating and cutting and you will slowly see the cam profile stary to develope

stop when you are left with 0.254" of the original diameter remaining.

See my post part way down this thread for the step by step as its the same sort of cam just in this case it is part of a gear

http://www.model-engineer.co.uk/forums/postings.asp?th=117930

John Rudd:
Jason,
Thanks for the explanation.....  :bow:
I'll take a look at the link too.... :beer:

John Rudd:
.....and one finished cam ready for hardening... :dremel:

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