Grinding a model engine cam shaft assembly.

This video illustrates a cam grinding tool that enables rapid and accurate forming of small model engine cam shaft assemblies. The video describes the basic design and functioning of the tool to produce a small 8 lobe cam shaft for a working 4 cylinder model engine.

[@MattysWorkshop]

Gday, absolutely fantastic grinding machine, brilliant idea mate, thanks for sharing, cheers

[@joecnc3341]

Thanks for the great video, Radial-9. Can you make the plans available to the rest of us?

[@joecnc3341]

Great Video! Thank You for sharing. Can you make plans available?

[@0120raptor]

If the master cam is following a roller bearing won`t the cam being ground be the wrong shape? Surely the master cam should press against a FLAT surface not a roller .

[@paradiselost9946]

valid point but as the grinding wheel is round...
teh master cam has to be laid out with this in mind, thats all. like you can lay a cam out for a non radial or offset plunger, flat, round, pointed, whatever. it just has to be compensated for...

[@reicht4]

great fixture sir,
is there any play or space on master/bearing side? did you do specific check for concentricity between centers?

[@johncrowley5612]

Very neat. How do you index the master cam relative to the individual lobe to be ground?

[@radial9202]

Hi John, The Master and individual lobe are locked in synchronisation by a timing belt and a degree disc is located by the master cam. The degree disc is not visible in the video as it is behind the input wheel, but any device to measure the angle of the master cam relative to the cam being ground would do. The master cam was rotated at 0, 90 and 270 degrees relative to the individual lobes. Also, the tool is rather basic and could do with more indexing refinement as it is very basic, but as a home made tool, likely to be used less than once a year, it did not warrant too much time on it's design, apart from being fairly solid.

[@Johnno-sw2dm]

I very much like your machine and plan on having a go at making it. May I ask the dimension from the pivot under the cam being ground to the master. Thanks for the Video.

[@radial9202]

Hi John, I used an imperial measurement as it seemed easier, the pivot hole to the center of the master cam is 6 inches - Therefore the cam being ground is 1.5 inches from the pivot that produces a quarter size lobe from the master cam.

[@Johnno-sw2dm]

Thanks very much. I have started getting some materials together and I will let you know how I go . Won't be pretty but hopefully it will work. It will take a while though.

[@abidansari9467]

Disk cam grinding

[@greggarnold5127]

Are the plans for this grinder available???

[@radial9202]

Hi Gregg, there are no plans that I am aware of, this grinder was made from ideas found on model engineering sites.

[@greggarnold5127]

@@radial9202 ok...
Thanks for the reply!

[@abidansari9467]

I want disk Cam grinding machine