Acme threading, Mazak T32 - Page 2
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  1. #21
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    Quote Originally Posted by Ianagos View Post
    Btw the poster above that mentioned the zig zag cycle that’s what the highlighted 0 is in mazatrol.

    Well the highlighted options are all different types of zig zag cycles

    Also in my part decreasing the sfm made the chatter go away but I think the other poster is correct about faster speeds being better for the carbide.
    I wish it would let me control the pass count but it auto-populates that cell.

    Programmed via Mazatrol

  2. #22
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    Quote Originally Posted by Cole2534 View Post
    I wish it would let me control the pass count but it auto-populates that cell.

    Programmed via Mazatrol
    I am fairly confident it will if you change the cycle type.

    You have 2 selected which is where it auto generates the number of passes. Change that to the highlighted 0 and it will let you select how many passes

  3. #23
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    Quote Originally Posted by Ianagos View Post
    I am fairly confident it will if you change the cycle type.

    You have 2 selected which is where it auto generates the number of passes. Change that to the highlighted 0 and it will let you select how many passes
    AH HA! I'm gonna set this bitch up with like 90 passes.

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    Quote Originally Posted by Cole2534 View Post
    Tool was minty at the beginning of the program.

    Programmed via Mazatrol
    why is the angle at 29? acme threads aren't like standard 60 degree threads. machine is feeding it sideways as it goes in.

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    Quote Originally Posted by BT Fabrication View Post
    why is the angle at 29? acme threads aren't like standard 60 degree threads. machine is feeding it sideways as it goes in.
    That field requires you put in the included angle of the tread for an infeed angle to match the flank. So 29 yields an infeed angle of 14.5, which would be correct for an acme thread. Some people would prefer to go a little less, but this can cause rubbing and excess tool pressure on the trailing flank.

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    Quote Originally Posted by BT Fabrication View Post
    why is the angle at 29? acme threads aren't like standard 60 degree threads. machine is feeding it sideways as it goes in.
    If you look above I posted the page in the manual that talks about it

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    Quote Originally Posted by Cole2534 View Post
    AH HA! I'm gonna set this bitch up with like 90 passes.
    Sometimes my machine will give me an error when I do too many passes. Usually catch it in simulation though.

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    OK, back at this and I've discovered the issue. The chatter is causing 2 things to happen.

    1) the material moves back in the chuck. Maybe I don't have the chuck pressure high enough?

    2) the tailstock moves rearward. I put an indicator on the base and it didn't budge a thou during the OD work and most of the threading. Once it got about 3/4 into the thread the chatter picked up and the tail base moved as far back as 1/8" in pass. By then the material had shifted enough in the chuck to ruin my threads.

    This machine has the powered tailstock. Looks like some sort of drive off a hydraulic actuator? Does it have clamping? I've been using M31/32 to move it.


  9. #29
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    Default Acme threading, Mazak T32

    Quote Originally Posted by Cole2534 View Post
    OK, back at this and I've discovered the issue. The chatter is causing 2 things to happen.

    1) the material moves back in the chuck. Maybe I don't have the chuck pressure high enough?

    2) the tailstock moves rearward. I put an indicator on the base and it didn't budge a thou during the OD work and most of the threading. Once it got about 3/4 into the thread the chatter picked up and the tail base moved as far back as 1/8" in pass. By then the material had shifted enough in the chuck to ruin my threads.

    This machine has the powered tailstock. Looks like some sort of drive off a hydraulic actuator? Does it have clamping? I've been using M31/32 to move it.


    Glad you checked for number 1. I know I mentioned that above.

    As far as number 2. All my machines have always had sub spindles so I cannot comment on the tailstock situation.

    And you possibly put a spring loaded center in the tailstock? I’ve been experimenting with doing this in my lower turret


    Also as far as your Chuck pressure when in the last time you took you Chuck apart and cleaned and greased it? Also what type of jaws are you using? I feel like serrated hard jaws would be best

  10. #30
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    Quote Originally Posted by Ianagos View Post

    And you possibly put a spring loaded center in the tailstock?


    Also as far as your Chuck pressure when in the last time you took you Chuck apart and cleaned and greased it? Also what type of jaws are you using? I feel like serrated hard jaws would be best
    I'm using a solid, live center.

    Chuck was cleaned and greased just prior to this part, got hard serrated jaws in it as a matter of fact.

    But, I think the answer lies in that photo- there's no tailstock pressure.

    I did some digging in the mazak forum here and there's a thread on it. Quick Turn 15 Tailstock body slips. Help!

    After reading I followed their diagnostic steps to confirm my TS clamp needed adjustment. I did it, and documented it lightly in that thread, to find that now I have all the tailstock pressure I want. I recut th thread with an indicator on the tail body and it didn't budge.

    Best I can figure is that my threading setup caused some harmonic resonance that helped the tailstock slide back. Once the center was no longer tight the bar went all over the place, explaining my drunken thread.

    Simple fix, even it did cost me a couple days and a hundred bucks in material.

  11. #31
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    So did the threads end up turning out good in the end?

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    Quote Originally Posted by Ianagos View Post
    So did the threads end up turning out good in the end?
    Yes sir. Good parts came out, about to deliver to the customer this afternoon.

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    Good job, I am proud of ya!!!

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  16. #34
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    Quote Originally Posted by DanASM View Post
    Good job, I am proud of ya!!!
    Thank ya sir.

    I left out the part where I put a LH top notch insert into a RH holder. Dunno where it went, but it went there with a crash.

    Programmed via Mazatrol

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  18. #35
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    Quote Originally Posted by Cole2534 View Post
    Thank ya sir.

    I left out the part where I put a LH top notch insert into a RH holder. Dunno where it went, but it went there with a crash.

    Programmed via Mazatrol
    Ouch yea you need to use ngr insert not ngl

    I seem to always just have the inserts in the opposite of the side I need

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    Quote Originally Posted by Cole2534 View Post
    Thank ya sir.

    I left out the part where I put a LH top notch insert into a RH holder. Dunno where it went, but it went there with a crash.

    Programmed via Mazatrol


    "Did anybody else hear that?"

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  21. #37
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    Quote Originally Posted by Ianagos View Post
    Ouch yea you need to use ngr insert not ngl

    I seem to always just have the inserts in the opposite of the side I need
    I have both, but this is purely my ignorance at fault. The shaft has LH and RH threads, so I bought L and R inserts, thinking that they were ground with relief for LH and RH threads. I wasn't thinking that the inserts were for different holders.

    All in all, I can sum up this project as trying too many new things at once:

    First time using the 3j
    First time using the tail stock
    First time using Top Notch inserts
    Not my first threads cut, but 4tpi acme is the most aggressive I've cut.


    Job is done, customer is happy, I made some money, I learned a LOT.

    Programmed via Mazatrol


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