Dimensions for 944 hub machining

[ricola]

I have drawings on my site, look in the speedster bit...
Rich

[DORIGTT]

What was your change in track over the stock setup?

What about the spindle modification?

[Sunroof53]

Sorry mate i havnt done it yet!

[Sunroof53]

Originally Posted by DORIGTT

What was your change in track over the stock setup?

What about the spindle modification?

I can answer that now .It was a 3mm each side.

[Chris Percival]

Yeah, good work. A very neat solution, I like your caliper mounting bracket, I think mine is going to be harder work!

[Chris Percival]

I have added pictures showing the tools that where made up in order to machine accurately.

http://www.fastbug.net/node/219

[Sunroof53]

Thats some jig your using ,but i guess your mass producing them .I didnt realise you were a buisness .I used soft jaws machined to the front boss dia and faced them so the hub sits squaure .I didnt have to machine the front just make a bearing spacer.I guess from the pictures you press the insert in with the bearing c/b under size and finish machine that in the fixture.
Many thanks Chris .

[Chris Percival]

No its not a business.. The machining was done by a friend of mine, these are his jigs that he made in order to do it for me.

The bearing inserts where made on the lathe, then pressed in complete. The bearing spacer is separate as it had to be made from aluminium so it doesn't rust..

[Sunroof53]

Originally Posted by ricola

I have drawings on my site, look in the speedster bit...
Rich

Thanks Ricola ,Your site is has been an inspiration .I Was a toolmaker many years ago ,but still have access to a lathe in my maintenance dept, so i can do the machining myself.Are both the inner and outer bearings vw and are they drum or disc bearings ?not sure if they are the same.Just had one hickup though,i hadnt realized you use a drum stub axle and i have two sets for discs only ,so now need to find some more!Thanks again.

[DORIGTT]

I apologize Skeeter, the question was directed toward Ricola.

[ricola]

I'm pretty sure that VW drum/disc bearings are the same so that bit's easy. From memory the increase in track was about 9mm?

What about the spindle modification? It was only a matter of spotfacing the mounting face and grinding down a bit for clearance..

Rich

[old gh bug]

I have just done this conversion and used ricola's excellent drawings i have a nice set up now like you i went and got disc stubs for some reason thinking that was what you needed . when you get the drum stubs you might find that you have to machine down the backing plate locating ring as my hub was just catching also used the dimensions on here for the caliper adaptor plates

Sorry for the rusty pic garage got flooded

[Sunroof53]

Thanks for the pic ,
I spent some time at the weekend measuring my disc stubs to see if i can use them .I have figures out that i need to drill the two M10s for the bracket 8mm in front of the back plate mounting holes which have the same pitch of 56mm .What i did find strange is that the mounting point measured from the rear bearing shoulder to the caliper mount is the same .This means that i need to gain the 10mm for the bracket.I can gain the 3mm from deepening the hub and the rest from machining the stub axle as you did the drum one .This leaves 10mm of tapped hole for the bracket and makes the caliper sit as the original spec.Of course i then have to cut the original vw mount back.Incidently i have build up up my stubs with weld and machined to use the porka bearing .I may regret this as it seems to use an imperial race 3/4 and 1"1/4.

[old gh bug]

I like the idea of that i did look at using disc stubs first of all but had a set of drum ones laying around so i took the easy route
Iwould be intersested to hear if the welding works as i think i would prefer that to the spacers i have used

[Sunroof53]

I have nearly completed the disc stubs and will post a picture soon .The built up diameters seem ok ,although i did make a spacer for the seal diameter .I did also
have to plug the 7mm tapped hole for the original back plate, as it would just break into the caliper bracket mount holes.What is apparent is the far graeter amount of surface area for the bracket to sit on compared to the drum axle.
I am looking forward to getting this sorted but i still have to narrow the rear trailing arms to finish the major bits .