Sign in to follow this  
Kevin Goddard

Thread Higbee

Recommended Posts

Is the a method to higbee (blunt start) a stub acme thread in Mastercam? Been hand writing them and would like a better way if possible. Thanks in advance.

Share this post


Link to post
Share on other sites

Show me the code that you want so that I can see what a higbee is. Anything is possible given enough time or money...

Share this post


Link to post
Share on other sites

This has just come up for me and was wondering if anyone came up with anything? I have a formula that I can't remember what all of it means and I'd like to share for feed back. I am currently waiting for an install of MCX and writing by hand anyway. This formula calculates finish (vanish) point in "Z".

 

Z.1+Z(1)+MCC

 

DELTA RPM / PITCH / SERVO LAG CONSTANT = MCC

 

(NOTE: Z(1) "little one" is relative to tool tip.

I'm a little foggy on this one)

 

TIA

Share this post


Link to post
Share on other sites

I have not heard of a solution in Mastercam but I am not a poweruser post guru type. I higbee a lot of threads but I hand write em. I am sorry for the lack of help.

Share this post


Link to post
Share on other sites

Kevin,

 

so how do calculate and do you comp the servo lag?

Share this post


Link to post
Share on other sites

we are told to cut them at a slower rpm usually at 100 rpm so that's why I'm calculating the servo lag.

(loss of pitch at encoder when speed changes)

the idea is to be a little gentle on the ball screws. no other reason I can think of.

Share this post


Link to post
Share on other sites

Kevin,

I've done it, but it was like forever ago. The way I think I did it was to create a second threading op using a square face grooving or cutoff tool. The tool only ran the Z depth to blunt the first third of a revolution of thread which was in my case about .062. the key was to program the lead out with a .01 z component and a .1 X component this retracted the tool over where the actual thread is to begin. program it as threading so that you can easily cut the blunt in a number of passes so its clean.

Share this post


Link to post
Share on other sites

Kevin

seco tools had a program you could download for there thread mills that had the highbee option in it. worked well. have not used in years. i think its still on an old p3 computer.

35k

Share this post


Link to post
Share on other sites

when I was a kid I used to cut them on a mill to prep the blanks for LoneStar gage. NOBODY I've ever worked for turned higbees for fear of tearing up the machine. By the end of the day I had the formula wired. TGIF!

when I have my notes in front of me I'll share for those interested and to save for search later in case I lose the thing.

 

cheers!

Share this post


Link to post
Share on other sites

I'm in the process of trying to mod a post to output threading correctly and in playing with it tonight i realized the Mastercam doesn't have a Z pull off component nor can you specify the pull off angle. I seem to remember programming that higbee in Gibbs actually. that would really have been along time ago.

 

suppose you could add it in manually. maybe it will be in X3?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

Join us!

eMastercam - your online source for all things Mastercam.

Together, we are the strongest Mastercam community on the web with over 56,000 members, and our online store offers a wide selection of training materials for all applications and skill levels.

Follow us