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Is there are Locostbuilders-friendly machine shop?
BenB - 11/1/09 at 04:09 PM

I need to get my crank pulley adapted for the blower install.

I just need four holes drilling into it and the holes tapping BUT it obviously needs to be spot on otherwise I'll get all kinds of horrible resonation especially when I bump up the red line to 9.5k....

So anyone know of any machine shops who are good value and able to do precision stuff like this. Presumably the pulley would need mounting on some kind of spindle to ensure the holes were all epicentric?!?!?
ST1100 pulley wheel
ST1100 pulley wheel

rf900rush - 11/1/09 at 04:42 PM

Hi
Have a search on ebay

There are some engingeering companies offering thier services.

I've bought matgierials from here but not sure if they do milling / lathe work

Linky


quick search found this.

Liniky

Martin

daviep - 11/1/09 at 04:54 PM

Is the blower part of a kit? Does it have instructions for mounting the pulley?

Personally I wouldn't be be happy using the bolts for location, the pulley should either fit on to a spigot or be dowelled in place to ensure the alignment is spot on.

Cheers
Davie

BenB - 11/1/09 at 05:11 PM

Aha! cheers for the Ebay headsup.

It's a homebrew installation I'm afraid

I agree re getting it spot on is going to be tricky, especially as I'm having to use a spacer device......

BenB - 11/1/09 at 05:12 PM

I might be using dowels though to avoid stress raisers on the bolt edge....

BenB - 11/1/09 at 06:39 PM

quote:
Originally posted by daviep
Is the blower part of a kit? Does it have instructions for mounting the pulley?

Personally I wouldn't be be happy using the bolts for location, the pulley should either fit on to a spigot or be dowelled in place to ensure the alignment is spot on.

Cheers
Davie


Oooooh! Hang on I see what you're saying!!! The pulley shown is the standard ST1100 lower crank pulley. That's what I'm drilling to attach a spacer onto. The supercharger pulley then attaches onto the spacer....

daviep - 12/1/09 at 06:42 AM

So do you have the spacer made already then?

What I'm trying to get at is how are you going to ensure the spacer is true to the bottom puley?

If the spacer fits on to a spigot then the bolt positions are not critical and could be bored on a pillar drill if nescessary.

If the spacer DOESN't locate on a spigot then the only way to ensure it runs true would be to true up the bottom pulley in the lathe chuck, bolt the spacer to it and then turn the spacer to size. Then you would bore both pieces for dowels before you unbolt them to make sure they always go together in exactly the same place.

Post some pics of all three pieces if you can, my intrest is piqued now

How much would you consider reasonable to pay to have this done? I'm considering starting to do homers as a side line but people tend not to realise the time involved.

Cheers
Davie