"Verloren was" methode?

Het gebeurt door te "lassen" door middel van frictie(wrijvingswarmte)! dus de spaken en de eigenlijke velg worden apart gemaakt en daarna aan elkaar gesmolten

denk dat plaatje in 1e bericht het ook goed laat zien - vergroot door klik!
ook lijkt daar te zien - door de kleuren rood en beige - dat het naaf-met-spaken deel aan het velgbed is 'gewrijvinglast' zoals araenarood beschrijft

op deze foto kun je goed zien hoe dit wiel in elkaar zit.

I was installing some new tires on some wheels that were refinished in the past for a new customer. When I went to balance them they were needing 6+ ounces of weight on the inside of the wheel and 3+ on the outside (real bad). There was no sign of any imbalance when being spun, and I rotated the tire several times on the wheel to try and overcome any tire high weight spot. Then, when I was hand spinning the tire on the balancer it sounded like there was some rocks on the wheel. I could find nothing. Then it hit me. The sound was coming from inside the wheel. These were hollow spoke wheels. Hollow spokes have a special valve stem that runs though the hollow void in the wheel. This is how they remove the sand casting when the wheel is manufactured. However, if you refinish the wheel and do NOT cover this area when sand blasting all the sand will get into the wheel. This is what happened here. When I removed the valve stem, it looked liked an hour glass of sand pouring out from inside the wheel.