Re your question about running 6" wheels on an 8" machine…yes
you can do that. Having said that however, you would do well to do a
bit of checking to see if the wheel covers, water feeds, etc will do
the job for which they were designed. You could find for example,
that with the smaller wheels, water will splash all over the place.
Also if the water feeds are above, as in many Star machines, the air
pressure caused by the rotation of the wheels may blow the water away
before it gets to the surface of the wheel. These are just some
things to think of. Not sure what someone else might also come up
I understand the problem with purchasing 8" vs 6" wheels but in my
personal opinion, the larger wheels will give you a looooot more
service. They will last for years if cared for and your cutting will
be much easier and faster due to the higher rim speed and larger
surface area. It depends on your objectives. If you want to discuss
more you can contact me offlist at @coralnut.
Cheers from Don at The Charles Belle Studio in SOFL where simple
elegance IS fine jewelry.