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September 19, 2019, 13:26:06 pm


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Author Topic: Cutting too big  (Read 368 times)
Herri
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« on: September 08, 2019, 18:51:57 pm »

I am having an issue cutting my wing ribs. The cuts (circles, slits) are slighty too big. Instead of 6mm I have 6,4, a 23mm circle hole is 23,5 ish.
The drawings are spot on. I don’t understand it. I am cutting outside the lines and using a 1,5mm mill.
Any ideas??
Thanks
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lloydsp
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« Reply #1 on: September 08, 2019, 19:42:51 pm »

As always, when you ask a question here, it's beneficial to all those who wish to help, if you'll post a copy of your .cb file.  Without that, we can't render much help!

See 'additional options/Attach' below the posting pane.

Lloyd
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Bubba
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« Reply #2 on: September 08, 2019, 20:35:07 pm »

Did you checked commanded vs actual travel distance in each axis?
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lloydsp
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« Reply #3 on: September 08, 2019, 21:03:32 pm »

BTW, Herri,

Check your responses fairly often.  You'll get MUCH quicker responses here than on any other site I can think of (except one pyrotechnics site I'm a member of... about a tie...)

Lloyd
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EddyCurrent
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« Reply #4 on: September 08, 2019, 22:02:34 pm »

The standard thing to check is what Bubba suggested, however it looks like the error remains constant over different distances, albeit they are rather small differences (6mm to 23mm)
My conclusion is that the tool is actually a 1mm diameter rather than 1.5mm OR did you specify a "roughing clearance" of 0.5mm in the machining operation ?

Wait a minute !, you said, "I am cutting outside the lines" but before that you mentioned, "circle hole" and "slits"

In that case the tool may be 2mm diameter or perhaps you specified a negative "roughing clearance"  

It might be possible that the direction of cut is affecting this.

Try some test cuts, first using, "Milling Direction" = conventional
then try the same cut using,  "Milling Direction" = climb

The small cutter may be bending into the cut especially if a high feed rate is being used, also try reducing the feed rate.
« Last Edit: September 08, 2019, 22:51:32 pm by EddyCurrent » Logged

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EddyCurrent
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« Reply #5 on: September 09, 2019, 20:53:52 pm »

In additiopn to what Lloyd said, it's always a good idea to provide feedback or updates on any suggestions offered.
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lloydsp
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« Reply #6 on: September 09, 2019, 21:24:47 pm »

Obviously, this fellow expects four or five days' delay between questions and help.

He needs to attend to the 'responsiveness' of this crew.

We all try to help, nearly immediately!!!

Lloyd
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EddyCurrent
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« Reply #7 on: September 09, 2019, 22:29:49 pm »

Why would anyone be content to suffer a problem for five days, especially when they have logged in several times since the 'crew' has responded ?

This is an increasingly common occurrence which is eroding my enthusiasm for participation.
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lloydsp
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« Reply #8 on: September 09, 2019, 22:42:19 pm »

Eddy,

Don't give up.  There are also folks who read, respond, and give details.  There are some who seem to ignore our responses, but most don't.

Lloyd
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lloydsp
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« Reply #9 on: September 10, 2019, 19:44:22 pm »

Well... one almost gets the impression that Herri's questions were just 'sucker bait', to see if anyone would respond.

He obviously doesn't attend to the politeness of acknowledging the help here!

Lloyd
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stevehuckss396
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« Reply #10 on: September 10, 2019, 19:57:36 pm »

Or maybe he figured it out and is embarrassed because the fix was easy and he feels foolish. Try to remember back to your first week trying to figure all this out. I think we should cut some slack. 
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lloydsp
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« Reply #11 on: September 10, 2019, 21:39:15 pm »

Steve, I always agree on 'cutting some slack', because I make a lot of mistakes, too -- even now.

But if he DID figure it out, he owes it to this community and to other new users to help clarify the solution.

Otherwise, everyone's just left guessing.

I wouldn't chide him AT ALL for making a simple "beginner's mistake".  I have a problem with his not interacting with us, after several folks have attempted to help.

Lloyd
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Bubba
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« Reply #12 on: September 11, 2019, 01:07:21 am »

Steve, I always agree on 'cutting some slack', because I make a lot of mistakes, too -- even now.

But if he DID figure it out, he owes it to this community and to other new users to help clarify the solution.

Otherwise, everyone's just left guessing.

I wouldn't chide him AT ALL for making a simple "beginner's mistake".  I have a problem with his not interacting with us, after several folks have attempted to help.

Lloyd

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Bob La Londe
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« Reply #13 on: September 14, 2019, 18:55:05 pm »

Oh, come on guys.  You are getting a little to rigid in your old age.  You cut me a LOT more slack than that when I first came on this forum.  In a different way, but... 
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Bubba
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« Reply #14 on: September 15, 2019, 12:38:11 pm »

 You are getting a little to rigid in your old age.
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