FULLY BASIC

[NEW2007]

Thanks guys,

Under your instruction , I finished my 4 alumimum

molds last weekend.It took me 30 hrs.I raise spindle speed from 7000 to 10000 (for 1/2" endmill)and 15000 ( for 3/16" endmill).Max rough step 1/64.Stepover percentage 60.Feed rate 150.Add air blower. NO any chip welding anymore on my router.Now I have some very basic Questions to ask (because of lacking of metalshop experiment).Hope your fourth instructs.

The Part is a 20" round with 3 degree,there are 7 deferent level pockets.Thickness 2".

Q1:for 1" depth pockets ,3/16" cutter run 2 finishing pass in full depty ,it produce big vibration.same thing happen when using 3 degree tape outside profile.

Q2:using 1/2" endmill outside profile what's usual machine method in metal shop? How to provent tool vibration in four corner ( with big offcut)?

 

Eric Peng

[edmBosto]

Eric,

For question #2 I believe you need to step the z down as for all of the contour when you are skimming it for the fin. dimension. If your getting chatter in roughing it out also do the same with your rgh tool. I believe this will help you.

[Mcam Nut]

you may want to put a corner fillet larger then the cutter radius, around .260-.270 or so will help alot for corner chatter,, and put in a remachine pass if you need a .250 corner rad

[Mcam Nut]

sorry I thought you meant inside corners. for outside you should remove as much of the offcut you can, as edm mentioned depth cuts will make a big diference

[NEW2007]

Thanks for your reply,

i using multi-pass plus stepcut.To save the time

only 2 pass was token for multi-pass(1/32" distance).maybe not enough?