Re: DM 4400 tooling
Hi Martin!
Yes, the bigger tools cause massive amounts of fretting and even pull out if you take a big enough bite.
There is definitely a problem with the amount of clamping force available within the DM4400 spindle.
These machines are old and most of the Belleville washers have lost their spring.
Just replacing the washers with news ones does not cure this problem.
As far as I can tell it's the one of the only fundamental flaws in the DM4400.
I can only recommend that you use no bigger than a 1/2" (12mm) cutter and take multiple cuts.
I've been using 1/2" mills for years but I've just recently found that the 3/8" end mills work even better.
You can go full width and 1D with them at 48ipm no problem. Cutting aluminum that is....
I only use ER40 collet chucks to hold slitting saw arbors.
I hope this helps...
Timothy
Dyna Mechtronics DM4400, Bridgeport Discovery 300, HAAS VF-0E, HAAS VF-2D
BobCad 16, 20, 24 and now V25