PrecisionmachinisT wrote:

"Cydrome Leader" wrote in message
...

The question is are there rules of thumb for how much runout is
acceptable for a small machine like this?


Machine size does not matter.

The smaller the end mill diameter, the more important it becomes to minimize
runout.

What amount of run out would have you worried for what you do?

I'd assume that wobble with an endmill would make wavy patters in
addition to wearing one or more flutes and just letting the others rub.

Also, is there any reason NOT to use a lathe chuck in a mill as a chuck
for larger drill bits?

I had to drill 5/8" holes in Al plate and got a 5/8 bit with a 1/2 shank,
but had no 1/2 drill chuck so I moved the lathe chuck into the mill and
used that.

Of course, it spun out a few times leaving drag marks on the drill bit,
but is doing this more dangerous in that you may launch a drill bit by
into your chest or something like that?

It doesn't seem like you're going to kill yourself with sherline, but
I'd rather not take up bad habits.