Hi, I need help drilling a Paddle Racket, this racket outside shell is fiberglass and core is EVA foam, other lighter foams are used too, for example polypropylene foam.
Im using a Syil X4+ machine with a spindle capable of 3000 RPM
I'm having a hard time trying to make a clean, nice and straight hole, I tried with HSS 2 and 4 flute endmills and 2 and 4 flute carbide endmill and the results are more or less the same and they are not satisfactory, here is the sacrifice racket Im using for tests:
and this is a macro shot of how the holes are finished:
As you can see there are concentrical bands that make the hole "not nice/not straight" I guess that happens due to material not finding a proper exit and revolving around the mill while its drilling.
Then I found this video, but I never saw a tool like that, the cuts look nice, I would like to know what kind of tool is that, or what is the best way to drill this racket using my machine (remember, fiberglass shell + eva foam core)
[ame="http://www.youtube.com/watch?v=ypBgZpLIrFI"]YouTube - Agujeros Paddle[/ame]
Thanks a lot in advance!!
Pablo