Help with "help circle"?
Posted: Thu Mar 17, 2016 9:48 pm
Hi guys. I hope you can help with some tech. drawing. I am on my way to making a snail and I was given some drawings which were referred to as a "help circle". I have never heard of that and I am wondering if it may be known by another name. The purpose seems to be to assist with ratios and as you can see at a radius of 114.6 every 1mm will = 2 degrees. How it works in practice I will figure out later just trying to track down what it is and where I can read up about its purpose. I can vaguely see how it will help, but need to get to the basic understanding of it and its purpose and why it would be referred to as a "help circle"? Thanks in advance if you can help.
John
John
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