Hi Ranga,

Sounds highly technical. In the old days we used to ask some basic questions

1 - What is my pinion speed

2 - What is the output speed I want to achieve

3 - Where is my Machinery Handbook

Once those questions are answered, there might be one more

4 - Am I going to cast and hob it myself, or do I buy out?

Regards - Sgt John.Rz

www.latviantourists.com.au ■

You have to ensure that the centre distances are the same at the top & bottom of the line of contact. Its not as easy as it sounds. ■

the center distance is rather simple if you know the following

1 number of teeth

2 module

3 modification if any

from this you will get the operating pitch circle diameter of the slewring

similarly get the operating pitch circle diameter of the pinion

the center distance will be the mean of the 2 pcds

alok goyle

involute tooling

faridabad ■

Let me explain the gist of my reply.

There is a large slewing ring with a fairly consistent vertical axis, or thereabouts; because the ring deflects out of the operating plane according to the orientation of the supported mass and the axis deflects accordingly.

The slew drive is usually not subject to exactly the same out of plane deflections because the fixing plate is quite flexible compared to a gearbox housing.

I think that's what I was trying to say.

Involute is perfectly correct; but you did ask for other factors to consider. ■

I think Ranga was just asking for basic information on the center distance

A large slew would have to be mounted correctly , on a flat surface for it not to deflect and the bolts tensioned right , the mounting checked for any runouts by a dial

the slew pinion is normally at the end of a gear drive running the slew gear

there should be no problem in mounting if it is assembled correctly ■