pete

An interesting YT channel Timo, thanks for the link. There's one or two builds of this Jacobs gear hobber on YT. But I don't recall...

I've had the drawings and castings for the Jacobs gear hobber for quite awhile Andy. I guess it's on my "list" as well. Mechanically...

Very true. You also or at least preferably need a way to positively drive the gear either electonicaly or mechanically (your...

Keep in mind that the B&S cutters are a compromise. Yes, you can cut a variety of gears with each cutter, but only one size will be...

I must be missing something Andy. Yes obviously a rack can be cut using the typical B & S design of gear cutters, and yes there also...

I don't know enough about any form of gearing to be absolutely sure of my facts Timo. But both the worm and wheel use an ACME profile...

Most rotary tables and dividing heads have the worm rotating within an eccentric bushing. So technically your correct Timo, but moving...

While it would be really questionable they did so for the methods used on that OEM gear, then high accuracy hobbing would certainly be...

Then best guess is yours very likely has a cast iron worm wheel L98. That might be ok if they used something like ductile iron, but with...

I've not had any issues with my own Vertex R/T Awake, but it's now at least 35 yrs old. So I don't know about any of there recent R/T's...

It's got nothing to do with making the shaft fit as is. Obviously it's the method of measurement and measuring tool used that's the root...

You can also do what's called ball burnishing as long as there through holes. It does take a hardened ball bearing of the correct size...

Try setting your compound slide over 5.7 deg, this gives you a ratio of 10 to 1 so you can machine tenths. And if you polish your...

Then that's your issue, without an accurate measurement for bore size then it's pretty tough to come up with a shaft size that will fit...

How and what are you using to accurately measure the bore? Having to go .003" -.004" under size on the shaft means something sure isn't...