Very poor mans cnc setup

[thehomeengineer]

Hi All
This is the only way I could think of to machine six internal radius on a gear for my Foden Steam Wagon. As can be seen from the photos I used a rotary table in conjunction with an indexing head. With some careful setting, up I was able to use the rotary table to cut the radius between the two-known start and finish angles (hand to calculate) and the indexing head simply allowed for the gear blank to be positioned at the six equally spaced positions. The rotary table, after cutting the first radius was returned to its original start position and the indexing head moved to the next location, this radius was then cut to the same start/finish angle as before and so on until all 6 radiuses were cut.

A CNC machine would have made this a whole lot easier, but as I don’t have one the challenge was overcome with a little bit of thinking outside the box.



Bottom left gear, finished with the six internal radius cut


Thank you for viewing
The Home Engineer