How would I define the Freud 72-300 bit for Litho?

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How would I define the Freud 72-300 bit for Litho?

Postby kristenanne77 » Thu Jan 05, 2017 1:27 am

This freud 72-300 bit is a conical (V shaped) shaped ballnose with the tip being 1/32 inch.
I want to try it for lithophane.
How woud I classify this bit as an addition to the bit menu. Its not exactly a straight ballnose, and it is not a V bit either.
Its a bit of both.
Here it is:
http://www.rockler.com/freud-72-300-tap ... -1-4-shank

Thanks
K
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Re: How would I define the Freud 72-300 bit for Litho?

Postby IslaWW » Thu Jan 05, 2017 1:32 am

Enter it as a tapered ballnose
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Re: How would I define the Freud 72-300 bit for Litho?

Postby Xxray » Thu Jan 05, 2017 3:15 am

I agree, tapered ballnose.

In fact a 1/32 TB is what I use for lithos, takes some time to get the fine detail but I can get details down to individual stands of hair.

Geometry of your particular bit could possibly cause variations in the cut vs a standard ballnose, only real way to tell is use both and see what is different.
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Re: How would I define the Freud 72-300 bit for Litho?

Postby kristenanne77 » Thu Jan 05, 2017 4:31 am

I don't see any entries for a tapered ballnose.
Only Ballnose, V bits and Engraving bits.

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Re: How would I define the Freud 72-300 bit for Litho?

Postby Adrian » Thu Jan 05, 2017 9:15 am

There isn't a tapered ballnose option for PhotoVCarve. Only the more recent programs like Cut2D, VCarve and Aspire have that option.

I'd try it as a 1/32" straight ballnose as only the tip is really used so the taper should have a minimal effect.
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Re: How would I define the Freud 72-300 bit for Litho?

Postby kristenanne77 » Thu Jan 05, 2017 4:31 pm

I was going to try and import the PhotoVCarve file into VCarve desktop 8.5 but I do not see an option for tapered ballnose in the VCarve program.

K
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Re: How would I define the Freud 72-300 bit for Litho?

Postby Adrian » Thu Jan 05, 2017 4:34 pm

It's definitely there in VCarve. Click New in the database and you can select it before entering the tool info.

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Re: How would I define the Freud 72-300 bit for Litho?

Postby dwilli9013 » Thu Jan 05, 2017 4:38 pm

kristenanne77 wrote:I was going to try and import the PhotoVCarve file into VCarve desktop 8.5 but I do not see an option for tapered ballnose in the VCarve program.

K

You have to change it in the drop down menu on the right side of the Tool Database.
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Re: How would I define the Freud 72-300 bit for Litho?

Postby SteveNelson46 » Thu Jan 05, 2017 8:14 pm

You could just draw your own. The Freud website has detailed drawings of their bit profiles.

http://www.freudtools.com/index.php/pro ... uct/72-300
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Re: How would I define the Freud 72-300 bit for Litho?

Postby kristenanne77 » Thu Jan 05, 2017 8:18 pm

Thanks. I have added the tapered ballnose.
Unfortunately, when I imported the PhotoVCarve toolpath file into VCarve, I was unable to change the bit size that I originally used with PhotoVcarve to the new tapered ballnose bit entry in VCarve.

K
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Re: How would I define the Freud 72-300 bit for Litho?

Postby LittleGreyMan » Thu Jan 05, 2017 8:35 pm

kristenanne77 wrote:Unfortunately, when I imported the PhotoVCarve toolpath file into VCarve, I was unable to change the bit size that I originally used with PhotoVcarve to the new tapered ballnose bit entry in VCarve.


I never tried it as I do not own PhotoVCarve, but it makes sense to me: you import a toolpath calculated by another software, so you can't change such a fundamental parameter as the tool which requires recalculating the toolpath.

I assume you have the same limitations as in Aspire: moving the toolpath (and not resizing it) and changing cutting parameters (speed and feedrate). See your Vcarve reference manual or help.

HTH
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Re: How would I define the Freud 72-300 bit for Litho?

Postby kristenanne77 » Fri Jan 06, 2017 1:13 am

In PhotoVCarve, I will try creating a new "engraving bit" with a diameter of .25 inch, side angle 0f 6.2 deg, and a flat diameter of 1/32 (.03125). That should be close.

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Re: How would I define the Freud 72-300 bit for Litho?

Postby adze_cnc » Fri Jan 06, 2017 6:34 pm

kristenanne77 wrote:In PhotoVCarve, I will try creating a new "engraving bit" with a diameter of .25 inch, side angle 0f 6.2 deg, and a flat diameter of 1/32 (.03125). That should be close.


If you want to be better than just close you could use a flat length of 0.0280". Trigonometry comes to the rescue.

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