Ok my first proper challenge 2017 to get my new DSG lathe up and running.
The worm in the apron driving the power feed is finished (by finished I mean f-ck-d). For the moment I am going to call the worm wheel serviceable.
Here they are:
So i want to make a new worm and also a hob for cutting a new wheel in the future. (worry about the hob details later but obviously turn the basics in one piece)
I have been previously advised that this is probably a diametric thread. On the worm a twin, two start thread.
How do I measure the original to determine the diametric thread pitch needed to cut this on the lathe?
I've tried to get my head around diametric thread stuff but please explain it like i'm 5 years old. Birthday in June so will be six then.
Just to be clear, I think I'me ok with the the practical thread cutting procedure but it's clarifying the diametric pitch combined with the twin threads where i'm stuck.