making end mills

[bdarin]

I'm making a model gattling gun and need a .270" ball-end end mill which, of course, doesn't exist. Guess I have to make my own. Obviously it will have to be a straight flute cutter (no way to do a spiral) but I haven't been having much luck. Anyone out there ever had to do this? 'preciate the info.

[Randy]

Is .2756 close enough? That would be 7mm, and metric ball end mills are made. Also, it wouldn't cost a lot to have tool grinding shop resize a 5/16. Maybe you have a worn out one in your toolbox, that would be the ideal scenario.

[mudbone]

Id just use a .250 ballnose. If the Radius is just for clearance, or looks.Plus there Cheap!! Hey, When at Home, dont take them drawings sooo serious!!! But of course be accurate at work!!

[hammer]

Someone in your area must sharpen end mills for a living.
Find that kind of source and go through the sharpened endmills with a pair of micrometers & you should be able to find about any size you need.
If not have them grind one exactly the size you want.
If that does not work for you, I can provide that service for you.