The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
Brian Rupnow:
We have a cam!!! Actually, we have two cams, once I get them parted off. Everything went very well, and the profile looks perfect. I took a cut every two degrees of rotation in the rotary table. This leaves only microscopic ridging, which will clean up very easily with a fine diamond file. However, no matter how you do the math, that is 180 trips back and forth with the manual table. My right shoulder will be sore tomorrow from crank turning. Old dogs do learn new tricks---this time after the profile was cut, I left the cam in the rotary table set-up and continued taking cuts every two degrees until I had completed the full 360 degrees. This is an excellent method of making cams, but it is tedious. Tomorrow I will dress things a bit with the fine diamond file and part the cams of from the parent stock. Then they will be flame hardened and quenched, then silver soldered to their individual camshafts.
lordedmond:
Hardened and quenched then silver soldered
Bit odd there Brian surly the SS unles you quench it again will soften them ?
Stuart
chipenter:
--- Quote from: Stuart on October 05, 2014, 04:14:45 AM ---Hardened and quenched then silver soldered
Bit odd there Brian surly the SS unles you quench it again will soften them ?
Stuart
--- End quote ---
Even soft solder will soften to spring steel , will requenching crack the joint ?
lordedmond:
Not sure
But I wonld not SS them but pin them and fix with Loctite ,put the pin in from the large rad portion where the Tappit has its clearance so that it will not affect the cam profile .
Just my 2pence worth
I think G Meek put this method forward when he did his cams made easy write up
Stuart
Brian Rupnow:
The outside diameter of the cam, in the non lift area is only .480" (12.2 mm). The bore is 3/8" (9.5 mm).That means that the wall of the cam is only .052" (1.3 mm). not much room for a pin in that. I will be a doing a bit of experimenting with this and let you know the results.
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