Tool Block Material?
Close
Login to Your Account
Results 1 to 14 of 14
  1. #1
    Join Date
    Oct 2007
    Location
    NJ
    Posts
    198
    Post Thanks / Like
    Likes (Given)
    17
    Likes (Received)
    46

    Default Tool Block Material?

    Hey guys,

    We made a bunch of tool blocks for our lathes out of A36.
    Over time they key-ways in the blocks have deformed to the point that the block will go out of square by a as much as .008", not the end of the world for turning, but for drilling it becomes an issue.
    We are going to make new ones, im just deciding on material.
    I was considering 4140 HT but i'm afraid the hardness would transmit vibration.
    1045 while stronger than A36, might still deform.

    Any thoughts?

    Thanks
    Sam

  2. #2
    Join Date
    Jun 2012
    Location
    Michigan
    Posts
    4,574
    Post Thanks / Like
    Likes (Given)
    4181
    Likes (Received)
    2733

    Default

    Why not cast iron?

  3. #3
    Join Date
    Apr 2015
    Country
    UNITED STATES
    State/Province
    Tennessee
    Posts
    136
    Post Thanks / Like
    Likes (Given)
    95
    Likes (Received)
    20

    Default

    Couldn't you use S7 if vibration is a big issue.

  4. Likes Mtndew liked this post
  5. #4
    Join Date
    Jan 2006
    Country
    UNITED STATES
    State/Province
    New York
    Posts
    1,597
    Post Thanks / Like
    Likes (Given)
    680
    Likes (Received)
    781

    Default

    How did they manage to deform that badly in the first place? Operators not cleaning the turret before installing?

    Sent from my SM-G930V using Tapatalk

  6. Likes Mtndew liked this post
  7. #5
    Join Date
    May 2015
    Country
    UNITED STATES
    State/Province
    Tennessee
    Posts
    178
    Post Thanks / Like
    Likes (Given)
    97
    Likes (Received)
    76

    Default

    I probably would go to 1018 or 1045, A36 is pretty gummy. It is surprising that they could deform like that though. I know OEM Haas blocks seem to be made from some soft cast junk, ones purchased from Global CNC are plain steel.

  8. #6
    Join Date
    Oct 2013
    Location
    Sutton, MA
    Posts
    88
    Post Thanks / Like
    Likes (Given)
    8
    Likes (Received)
    67

    Default

    Why not have screw in keys? Mill a channel for them to locate into and then the keys can be a harder material if need be/ replaced occasionally.

  9. #7
    Join Date
    Feb 2012
    Location
    California
    Posts
    1,354
    Post Thanks / Like
    Likes (Given)
    877
    Likes (Received)
    1449

    Default

    The tool blocks are probably getting abused, slammed into place, maybe with a mallet. Contamination is a possibility as well, as @chip_maker mentioned.

    I think using harder material is just going to encourage the behavior until the turret starts getting damaged.

    Quote Originally Posted by dpolseno41 View Post
    Why not have screw in keys? Mill a channel for them to locate into and then the keys can be a harder material if need be/ replaced occasionally.
    The keys are screwed into the turret. The blocks have keyways (female).

    Photo courtesy of Hurco. Mill-Turn Turret Shootout: VDI vs. BMT

    bmtvsvdi_2.jpg

  10. Likes Jashley73 liked this post
  11. #8
    Join Date
    Jun 2006
    Location
    Near Seattle
    Posts
    4,666
    Post Thanks / Like
    Likes (Given)
    2911
    Likes (Received)
    1232

    Default

    Here's a side track - the link Orange Vise pointed to claims that it is normal to "indicate in" VDI tooling. Really? Mine fits over a pin, I doubt it could move - of course I'll have to check. But I've never seen this suggested anywhere else. Is this an outlier idea, or a sign of my overly sheltered life?

  12. #9
    Join Date
    Mar 2006
    Country
    PHILIPPINES
    Posts
    2,342
    Post Thanks / Like
    Likes (Given)
    464
    Likes (Received)
    683

    Default

    Quote Originally Posted by bryan_machine View Post
    Here's a side track - the link Orange Vise pointed to claims that it is normal to "indicate in" VDI tooling. Really? Mine fits over a pin, I doubt it could move - of course I'll have to check. But I've never seen this suggested anywhere else. Is this an outlier idea, or a sign of my overly sheltered life?
    My VDI tooling is a bit different. I have the base VDI that fits the pin snug but I have some higher quality stuff the has about .010 slop and 2 set screws on each side of the pin to dial them in dead nuts.

  13. #10
    Join Date
    Oct 2007
    Location
    NJ
    Posts
    198
    Post Thanks / Like
    Likes (Given)
    17
    Likes (Received)
    46

    Default

    Quote Originally Posted by bryan_machine View Post
    Here's a side track - the link Orange Vise pointed to claims that it is normal to "indicate in" VDI tooling. Really? Mine fits over a pin, I doubt it could move - of course I'll have to check. But I've never seen this suggested anywhere else. Is this an outlier idea, or a sign of my overly sheltered life?
    Our VDI Live tools dont use the pin. They have a block on the front face of the turret to square it up.

    The keys are in the turret. the slots are in the tool block. the slots have distorted.
    Im trying to figure out how and why.Attachment 264862
    Attached Thumbnails Attached Thumbnails img_8296.jpg  

  14. #11
    Join Date
    Jun 2019
    Country
    UNITED STATES
    State/Province
    Texas
    Posts
    184
    Post Thanks / Like
    Likes (Given)
    50
    Likes (Received)
    155

    Default

    Quote Originally Posted by Sam L View Post
    the slots have distorted.
    Im trying to figure out how and why.Attachment 264862
    I don't know, they were just like that when I got here!

  15. #12
    Join Date
    Jan 2014
    Country
    UNITED STATES
    State/Province
    Washington
    Posts
    4,400
    Post Thanks / Like
    Likes (Given)
    803
    Likes (Received)
    2366

    Default

    Quote Originally Posted by Sam L View Post
    ......The keys are in the turret. the slots are in the tool block. the slots have distorted.
    Im trying to figure out how and why.
    Crash damage.

  16. #13
    Join Date
    Oct 2007
    Location
    NJ
    Posts
    198
    Post Thanks / Like
    Likes (Given)
    17
    Likes (Received)
    46

    Default

    No crash.
    Its on three of them.

  17. #14
    Join Date
    Jun 2013
    Country
    UNITED STATES
    State/Province
    Washington
    Posts
    52
    Post Thanks / Like
    Likes (Given)
    2
    Likes (Received)
    10

    Default

    4140 normalized. Rc 30 not gummy. If that is not hard enough then heat-treat.
    8620 somewhat gummy but case about 40 deep and quench in oil and they should last forever. ;-)


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •