New User, Introduction...

[Rob]

Hello everyone.  My name is Rob. I have spent a lot of time reading through this forum and others.  I received my Iconic 8 in early January.  Had a few learning curve issues but I feel pretty good right now.

I have researched feed and speed over and over and over again.  I completely understand what it means but I'm not quite sure about translating it to a real world project.  So far for the most part I am just doing things slow and safe.  If I am doing a small 4 in by 4 in project I can't imagine running this machine at 18000 RPM and 150 IPM.  So in this case what would I adjust?

Amana tool spec for 46202 down cut end mill  180 IPM, 18000 RPM, .005 Chip load.   In order to keep the chip load would I run it 50 IPM and 5000 RPM?  (.25 cut depth)

I also seem to have lots of dust and chips stuck in the tool path when doing profile cuts even with an up cut bit (46316) same depth. 

My profile cuts also seem to scream and chatter.  I read that a screaming bit need to be feed. LOL  I believe this issue is 100% related to the above questions.

Well I won't write a book.  I am sure I will have questions in the future.

Thanks for your help!

Rob

[johnb]

Speed up your IPM and reduce your depth of cut. See if the screaming goes away. You want chips, not dust

[Rob]

Does anyone on here have any insight on this? Again I can't imagine running 100-150 IPM on a 4 inch square.

[Kristy]

Jan 22, 2021 11:24:38 GMT -5 Rob said:

Hello everyone.  My name is Rob. I have spent a lot of time reading through this forum and others.  I received my Iconic 8 in early January.  Had a few learning curve issues but I feel pretty good right now.

I have researched feed and speed over and over and over again.  I completely understand what it means but I'm not quite sure about translating it to a real world project.  So far for the most part I am just doing things slow and safe.  If I am doing a small 4 in by 4 in project I can't imagine running this machine at 18000 RPM and 150 IPM.  So in this case what would I adjust?

Amana tool spec for 46202 down cut end mill  180 IPM, 18000 RPM, .005 Chip load.   In order to keep the chip load would I run it 50 IPM and 5000 RPM?  (.25 cut depth)

I also seem to have lots of dust and chips stuck in the tool path when doing profile cuts even with an up cut bit (46316) same depth. 

My profile cuts also seem to scream and chatter.  I read that a screaming bit need to be feed. LOL  I believe this issue is 100% related to the above questions.

Well I won't write a book.  I am sure I will have questions in the future.

Thanks for your help!

Rob

Hey, Rob, in this case, check out the feed and speed rate recommendations listed on Amana Tool's site. You can find the recommendations on the bit page (it is listed under the image).

For the 46202, here is the link:https://www.amanatool.com/46202-solid-carbide-spiral-plunge-1-4-dia-x-3-4-x-1-4-inch-shank-down-cut.html?ff=1&fp=8801 

If you have additional questions, give our support team a call. 

[Bob]

And, another feed/speed link: www.precisebits.com/calc

[mnwoodbee]

Chattering and screaming is usually a sign of tool deflection. Your feeds and speeds could be perfect but is the tool out 2” from the collet?
Choking up on the bits reduces deflection which causes vibration then hearing and if bad enough seeing in the edge of your cut left by the tool.

[zmuda01]

Make sure your work piece clamping scenario is rigid as well. Chatter is vibration and it can come from several places. Once it starts you are generally screwed, sometimes you can outrun it by increasing the feed or lowering the RPM, sometimes. I have found that using cobalt/hss endmills 2 and three flute work well for aggressive cuts as the tool will allow flex and absorb vibration better than carbide. The trade off is their life span is much shorter.

In my opinion the proper order of investigation is tool length, clamping, chip load. It is surprising how hard you can run a tool if the tool length and clamping are good. If you are set on all of these and the chatter is still an issue take a walk around your machine with an allen wrench and make sure all the cap screws are snug. It's unlikely that your machine is loose but it is possible. I found loose bolts on my Z axis stepper mount before which was causing me repeatability issues. Only takes a couple minutes to rule it out.

[Rob]

Thank Guys! I will just have to be systematic and slowly work my way faster and faster.