Measuring PCD holes

I see the trade refers to them as "centreless wheel balancing adaptor" - like this:

This came from the 1st search result: https://www.garageequipmentonline.com/products/tyre-changer-and-balancer-options/centreless-wheel-adaptor

Hope that is clearer.

Simon

That looks familiar. Not used much these days of course - now a minority sport, for good reason.

But didn't it take 10 pages to determine the tapping size drill for an M8 thread? and for the great unwashed, the centre hole and the mounting stud holes will be punched at the same time. Wersant wide wheels the replacement for hanging them out on studs?

Regards Ian.

What's wrong with laying the wheel on the piece of spacer material and marking the five holes on the material with a sciber, then finding the centres of the five scribed holes using dividers, or by drawing a box around each circle and scribing the diagonals, then centre punching and drilling accordingly? It's a spacer isnt it? Holes can be drilled clearance size on the studs.

Small wheels may be blanked in one pass but not all are done that way. Here is a very interesting photo essay showing large 4x4 wheel manufacture from strip to paint booth **LINK**

Balancing is intersecting in it's own right (especially dynamic balancing) and the effects of altering wheel width, offset and diameter have profound effects on vehicle handling. It is a very interesting subject and there is considerably more to it than might at first be apparent.

Mark

Centre hole is sized at same time as mounting stud holes. Only shows primary centre location for dishing rest of details.

Regards Ian.

Ian, I would expect there to be some method to ensure concentricity but I imagine they may well form the up-stand at the hub center and form the bolt/nut seats at the same time having punched the holes previously. They may also blank and form at the same time but that would require significant press capacity as I am certain you already know. Unless they have a standard production sequence then each manufacturer will have their own variations on a theme depending on product and press availability.

Mark