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By MetalShavings

August 15, 2017, 8:27 pm
Updated by: Eldar Gerfanov August 22, 2017, 8:59 am

I'm Stuggling With Chamfer Tools [SOLVED]

I'm trying to set up a 3/8" 90 degree 4 flute coated carbide Chamfer tool and figure out what feeds and speeds I'll be needing for my particular application.

I seem to be able to enter the correct information and get what looks like the correct angle and length on the tip of my tool in the display window but, the feeds and speeds seem very odd.

I've been told that although 90 degree Chamfer tools are listed at 90 degree, the angle of the flutes are actually 45 degrees on either side which adds up 90 degree. If this is the case, what is the correct angle to enter in the corresponding text field?

In the tool data base I found 90 degree 1/4" and 1/2" Chamfer tools listed but I couldn't figure out how to bring them over into the Feeds and Speeds page. I just wanted to experiment with those Chamfer tools already in the data base in an attempt to figure out what I'm doing wrong when I enter the data for my 3/8" 4flute Chamfer tool.

The speeds and feeds I'm getting are 10,000 speed and .09 feeds. For a tool that's spinning at 10-K-RPMs and taking such light cuts it seems like the feed should be a lot more than .09. I know I'm doing something wrong. I just can't figure out what exactly.

In my CAM software I'm able to assign a specific depth as the actual contact position of the angle of the cutting flutes to my part but I'm not sure how to enter that depth; or if it even translates into the HSMA sofware. I tried varying the DOC in the HSMA feeds and speeds page but it doesn't seem to effect any changes.

Can you help me figure this out. Since being gifted with this feeds and speeds software I've been able to figure out the features that have helped me speed up the machining efforts of my weaker Tormach hobby mill but there are times like now when I just can't figure it out without some help.


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Eldar Gerfanov

August 16, 2017, 12:04 pm


Can you attach a screenshot of the whole thing?




August 16, 2017, 3:21 pm

I played around with it a little more and I got some numbers that may be a little more realistic but I don't know for use. I'm only wanting to shave the very corners of my tiny steel parts.

I'm hoping to chamfer off about .01 axial depth by .01 radial depth.

Thanks for your help or input.

screen shot chamferscreenshot.jpg

Eldar Gerfanov

August 16, 2017, 8:02 pm
Updated by: Eldar GerfanovAugust 31, 2017, 11:39 am


I just got home and finally had time to do a sketch for you.

Please observe the screenshot.

Couple of things to look at:

  • Select Chamfer Tool Type
  • Your DOC is the distance from the tip of the tool to the edge of the workpiece.
  • Your WOC is the actual width of your chamfer

In other words your DOC controls the position of the tool and the WOC alone controls the engagement with the workpiece.

I know your CAM may be setting setting things differently but i like this way and the graphic on the right should really guide you.

If you are seeing weird stuff on the right, it is probably wrong :)

Best regards.

HSMAChamferSetup.png HSMAChamferSetup.png


August 17, 2017, 2:13 pm

Thank you Eldar:

I'll try entering the same numbers I my HSMA screen to see what happens.

One of the possible reasons I had problems setting up my 3/8" Chamfer tool is because the geometry of my small parts will not allow me to have a depth of cut as deep as you show in your screenshot. If I go that deep I will cut a trough along the face of my part that isn't supposed to be there.

Also: on my Chamfer tool the shank diameter is .375". I noticed you listed something like .325". What is that all about? It probably makes no difference in the grand scheme of things but I'm just wondering if you deliberately did it this way for a reason or maybe it's just a typo.

Thanks again.



August 17, 2017, 2:38 pm

OK; I think I finally figured out where I screwed up. You pointed it out clearly in your screenshot and it still took me a while to see the problem.

I never selected Chamfer Tool from the tool scroll down list. I was trying to set up my chamfer tool using a common end mill. I knew it had to be something simple. It just took a master to help me figure it out.

The following screenshot is what I ended up with. Even with my limited knowledge, I think the feeds and speeds are a little more realistic.

Thanks for your help.

Tim M.

corrected screenshot.jpg corrected screenshot.jpg


August 17, 2017, 2:52 pm

One last question and I'll leave you alone for now:

On my Tormach 770 mill I started milling all my 1018 steel parts using the lower pulley to get the maximum torque I can get out of my under powered machine.

The max RPM I can get in low gear is 3250 RPMs. I tried entering this RPM value in the feeds and speed to see what feed rate it gave me. I entered 3250 but that number would automatically change to 4000 RPM with a feed rate of 14.

My reason for wanting to try to get the feeds and speeds for this lower RPM is because it would keep me from having to stop and take the time to change from one drive belt/pulley to the other. I figured it would be quicker to just use the slower RPMs and Feed rate rather than stopping the machining process to change pulleys. Does this make any sense?

Tim M.


Eldar Gerfanov

August 18, 2017, 9:44 am
Updated by: Eldar GerfanovAugust 31, 2017, 11:42 am


Glad you got that sorted.

You can change the Max RPM in the Machine Profile. Make sure to save your changes.

I entered 3250 but that number would automatically change to 4000 RPM with a feed rate of 14.

If you enter RPM in the RPM box manually, it will recalculate the feed to keep the chipload the same.



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