Over Cutting

[JohnsCNC]

Newbie set up question -
I am trying to carve some stars and a flag as well as some letters. There are some bars in the flag that seem to be cut away and my lettering is being carved too wide. Stars being over cut ending up about half the size. I did a test cut to cut some bars .3" and they ended up .2" I double checked the bit settings, its a 60degree vbit. Got the settings for vcarve from two different sources and they are confirmed. I must have some other setting off - any ideas?

Thanks in advance.

john

[IslaWW]

john...
If you desire help, post your CRV file, unless it contains copyrighted materials, then post pictures of the erroneous results and screen shots of your toolpath settings

[JohnsCNC]

I will be able to do that tomorrow. Thanks!

[JohnsCNC]

I am attaching a screen shot of the calc page from vcarve, the code and a picture of the result with the rectangles cut short. Thanks for the help

The code is below labeled Test.txt

Test.txt

(40.63 KiB) Downloaded 112 times

[JohnsCNC]

Result

[ger21]

Images larger than 192x256 pixels would be helpful.

[JohnsCNC]

CRV File, Not the exact one, but done with the exact same measurements.

Updatedvcarv.crv

(59.5 KiB) Downloaded 121 times

[Rcnewcomb]

The tool is called a 0.25" V bit but the diameter is specified as 1.0625

[JohnsCNC]

Those are the exact specs I have in on mine. I doubled check them with two sources including Amana Tools.
Thanks - any other ideas?

[Rcnewcomb]

I'm not sure where you came up with a diameter of 1.0625". The largest diameter I see for an Amana 60 degree V-bit is 0.5" diameter.

Also, it is best to keep the name of the tool consistent with the actual measurements.

Additionally, the file you supplied had duplicate vectors. Use the Vector Validator to catch issues like that. You can get rid of them by choosing Edit/Select Duplicate Vectors and then Edit/Delete.

[martin54]

I'm not sure where you came up with a diameter of 1.0625". The largest diameter I see for an Amana 60 degree V-bit is 0.5" diameter.

Also, it is best to keep the name of the tool consistent with the actual measurements.

Additionally, the file you supplied had duplicate vectors. Use the Vector Validator to catch issues like that. You can get rid of them by choosing Edit/Select Duplicate Vectors and then Edit/Delete.

They do an insert v bit Randall, found this with a search. Don't have software on this laptop so can't check file & picture is way to small for my bad eyesight

https://www.amanatool.com/rc-1108-inser ... 1&fp=11963

[Leo]

There is no text on the file you posted. This is not an apples to apples test.

From what I an seeing there is no problem - everything is - as it should be.
You should lable you tools to match the cutter - that is not a .25 cutter.
Looks like the 1.0625 is correct IF you are using that inserted tool.

In your original post you made mention of issues with the text.

I cannot duplicate because I don't know the size and style you used.

Can you post the CRV file that you are having issues with. A CRV that is "like" the problem file is not going to help us to find the problem area.

[Adrian]

Preview of the code you posted with a 60 degree v-bit produces the results I would expect and the first two bars measure 0.25 and 0.51.

I'd double check that the feed rate and rpm's are appropriate for the combination of bit/material/machine, that nothing is flexing and Mach3 has been properly calibrated.

Assuming of course that the bit really is a 60 degree one. Just because it says it is doesn't mean it is.

[JohnsCNC]

Thanks for all the help so far.

The 1.0626 is from Amana tools and its not the diameter of the shaft, but the diameter of the top cutting point of the tool itself.

My preview looks almost exact also. Thats why I cant figure out why this is happening. I measured the bit and it is a 60 degree, it also says 60 and has the tool number RC-1148 on the shaft. Amana tools in response to an email said to check the actual angle, it may be off from the factory. Really???

I am going to it all again and check the vector validator and let you all know what happens.

Thanks again.
John

[adze_cnc]

Ignore the preview. It's perfect because it doesn't exist in "reality". If your depth of cut is not exactly 0.3 inches and your bit's included angle is not exactly 60 degrees you'll have problems.

Check viewtopic.php?f=3&t=2164 for a method of determining your bit's true angle.