#8 Thread data anomoly

[Goatofmendez]

Hi, where exactly did you get your thread data definitions from? They don't seem to match any I can find.
Example:
M6 x 1.0 thread.
Mach3Helper =
0.1 radius
1.G76 p1.0 r5.887 x4.603 h0.234 i29.5 k2.02 z-10.0 l360 q0
Cut depth 0.642

https://www.newmantools.com/tech/threadm.htm =
Minor diamter 4.773
Thread height 0.613

I find i always have to increase the "X" command/size when using the tool or the thread is very loose.

thanks

[stephanbrunker]

In that table is only only the very basic thread definition. I used these tables: http://www.emuge-franken-bg.com/attachments/article/97/15%20Gewindetabellen.pdf . On the 7th page (#485) the last figure tells how the tolerance fields are applied. (Also the help in "about Threads"). For pitch 1 mm, the mensuration is 26µm for tolerance class g, and for grade 6 the tolerance is 180µm for the outside diameter and 112 for the pitch diameter. My program outputs 5.887 +- 0.087 and 5.269 +- 0.054 .
That means for the outside diameter: 6.000 minus the mensuration 0.026 minus half the tolerance 0.090 = 5.884 plus minus 0.090. The difference of 3µm is because of my interpolation of the table values. I put the cut line in the middle of the tolerance field, so you have maximum possible deviation to both sides.

You can use class 4g/4H, where the tolerance is +- 0.056 and 0.034 for example. Or your tool tip radius is not perfectly measured, 0.1 mm more there result to 0.1 mm less in pitch diameter, which is already outside the tolerance.

[Goatofmendez]

It would be good to have a thread depth over-ride.

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When I came here 17 years ago, you all laughed at me. Well, you’re not laughing now, are you!

Nigel Farage MEP - [Addressing the European Parliament June 28th 2016]

From: stephanbrunker [mailto:stephanbrunker@users.sf.net]
Sent: 30 December 2017 10:11
To: [mach3threadinghelper:tickets]
Subject: [mach3threadinghelper:tickets] #8 Thread data anomoly

In that table is only only the very basic thread definition. I used these tables: http://www.emuge-franken-bg.com/attachments/article/97/15%20Gewindetabellen.pdf . On the 7th page (#485) the last figure tells how the tolerance fields are applied. (Also the help in "about Threads"). For pitch 1 mm, the mensuration is 26µm for tolerance class g, and for grade 6 the tolerance is 180µm for the outside diameter and 112 for the pitch diameter. My program outputs 5.887 +- 0.087 and 5.269 +- 0.054 .
That means for the outside diameter: 6.000 minus the mensuration 0.026 minus half the tolerance 0.090 = 5.884 plus minus 0.090. The difference of 3µm is because of my interpolation of the table values. I put the cut line in the middle of the tolerance field, so you have maximum possible deviation to both sides.

You can use class 4g/4H, where the tolerance is +- 0.056 and 0.034 for example. Or your tool tip radius is not perfectly measured, 0.1 mm more there result to 0.1 mm less in pitch diameter, which is already outside the tolerance.

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[tickets:#8] https://sourceforge.net/p/mach3threadinghelper/tickets/8/ Thread data anomoly

Status: open
Milestone: 1.0
Created: Fri Dec 29, 2017 06:57 PM UTC by Goatofmendez
Last Updated: Fri Dec 29, 2017 06:57 PM UTC
Owner: nobody

Hi, where exactly did you get your thread data definitions from? They don't seem to match any I can find.
Example:
M6 x 1.0 thread.
Mach3Helper =
0.1 radius
1.G76 p1.0 r5.887 x4.603 h0.234 i29.5 k2.02 z-10.0 l360 q0
Cut depth 0.642

https://www.newmantools.com/tech/threadm.htm =
Minor diamter 4.773
Thread height 0.613

I find i always have to increase the "X" command/size when using the tool or the thread is very loose.

thanks

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[Goatofmendez]

It would be far simpler for most people to be able to ignore the tip diameter completely and be able to put in your own cut depth. e.g. have an over-ride tickbox. Having the program set the cut depth without being able to adjust it is problematic. I know I can set the depth in the actual Gcode, but then the pass calculations are not right. Like I say I find i have to adjust the final depth of cut in the gcode on most threads that the helper provides.

regards