Author Topic: Thread Milling  (Read 251 times)

Offline Bob La Londe

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Thread Milling
« on: December 28, 2022, 23:45:35 pm »
Most of you know, but for anybody who doesn't. 

*  Thread from the bottom up.  This leaves the chips below the cutter at all times.  For standard right hand threads this will be climb milling.

*  Your depth increment is your thread pitch.  For us inch guys that's (1/TPI). 

*  When using a multi form thread mill CB seems to ignore the flute length.  Set your stock surface about two thread pitches (depth increments) above your total depth.  Keep your clearance plane above the actual stock of course.

Just reminding myself.  LOL. 
Getting started on CNC?  In or passing through my area?
If I have the time I'll be glad to show you a little in my shop. 

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Offline dh42

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Re: Thread Milling
« Reply #1 on: December 29, 2022, 16:02:44 pm »
Hello

Quote
*  When using a multi form thread mill CB seems to ignore the flute length.  Set your stock surface about two thread pitches (depth increments) above your total depth.  Keep your clearance plane above the actual stock of course.

CB ignore the flute length given in the tool library but it take in account the one given in the mop itself.

++
David

Offline Bob La Londe

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Re: Thread Milling
« Reply #2 on: December 31, 2022, 01:34:01 am »
Ah, one of those parameters I can't seem to find in the styles library. 

My way is a work around, but I can save it in the style so I think I'll keep doing it my way. 
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Offline dh42

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Re: Thread Milling
« Reply #3 on: December 31, 2022, 17:03:28 pm »
Quote
Ah, one of those parameters I can't seem to find in the styles library. 

Yep, unfortunately, also missing in styles ; in fact only the thread mop has this property in the mop settings.

maybe this can be added in the features request topic ...

++
David

Offline Bob La Londe

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Re: Thread Milling
« Reply #4 on: December 31, 2022, 17:29:11 pm »
Quote
Ah, one of those parameters I can't seem to find in the styles library. 

Yep, unfortunately, also missing in styles ; in fact only the thread mop has this property in the mop settings.

maybe this can be added in the features request topic ...

++
David

It would be useful for all mops if it also issued a warning. 
** Depth Increment Larger Than Flute Length
** Peck Distance Larger Than Flute Length (Also if single plunge)
** Etc

For threading it might be confusing though.  Typically a multi full form tool can't thread any deeper than its flute length, but single form and three form thread mills definitely can. 

One of the reasons I use styles for almost all operations anymore is to figure out the confusing things and then not worry about it again.  Its not thoughtless plug and play, but it helps save me from a lot careless or time consuming mistakes.  Probably even more than "Simulate in Camotics" (which catches a lot of mistakes).

Another useful warning might be "** Depth Larger Than Tool Stickout," except that I have made some specialty tool holders specifically for milling deeper than the tool stickout in some applications. 
« Last Edit: December 31, 2022, 17:32:20 pm by Bob La Londe »
Getting started on CNC?  In or passing through my area?
If I have the time I'll be glad to show you a little in my shop. 

Some Stuff I Make with CamBam
http://www.CNCMOLDS.com