VX assembly conductor

[dimonVX]

VX assembly conductor
I have looked to my blower some month ago and thinking. How to assembly and synchronize the rotors? How made the job on car installed blower.
I have look on shaft holes, and idea comes to my mind. The one way to install rotors to profile grinding machine is use shaft holes. The holes is base surface of the shafts.
There is my variant of conductor. It is milled from 3 mm alloy.
http://s42.radikal.ru/i097/0907/f2/0db0af83297b.jpg (http://www.radikal.ru)
1.Take off rear housing.
2. Install conductor, tighten 4 nuts. Embosses plunge to shafts holes , the centering pins are also in usage .
3. The shafts are ready to tighten 30mm nut.
The tool are checkied on my blower- OK.
I have try to put archive of the SW models to download part of Lancisti- but it is no result.
IF somebody want (models of parts, .iges file for milling program)- sent request to dmitryvern@rambler.ru

[Will]

Hi Dmitry;

I tried basically the same thing the first time I tried to make a fixture for the Vx rotors. I thought to use the holes, same as you. Unfortunately, it did not work!

The problem is that the fixture is on the opposite end of the rotors and with the huge amount of torque the rotor nuts take, the rotors tend to twist on the fixture.

I redesigned it so that it slides down over the outside of the rotors so the fixture is close to where you are applying the torque. This way works much better.

In a perfect world, if everything were completely rigid and there was no such thing as flex or backlash, theoretically it would work the way you drew it- but this is the difference between engineering and reality!

I think FIAT probably used the holes for grinding the rotors (not much force involved and they were probably held from both ends).

I think Guy Croft might have run acreoss the same problem since I notice he uses a slab of metal with a "T" shape milled out of it that is the width of the rotors. This is probably the simplest solution but then each rotor only bears on two small points on the jig- my rotors were coated with a thin film lubricant and I did not want to damage them so I came up with the following (about halfway down the page):
http://www.avs.spot-mate.com/sc.html

It's a welded steel frame that solder is poured into. It fits tightly to the rotors and provides uniform support- and since it slides down OVER the rotors it braces them from the correct end.

Your drawing looks nice, sorry to give you the news!

[dimonVX]

The tool is working properly in my blower. I have made 2 check assembly. Both times blower rotate normally. I use ordinary flat material snc milling machine, precise about 0.1mm.
I think about modeling deformation of rotors