DTM Toolpost identification and tool holder sizing
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  1. #1
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    Default DTM Toolpost identification and tool holder sizing

    I acquired a DTM quick change toolpost. The identification plate has been removed. An AXA toolholder does not fit on the dovetails. A BXA toolholder fits on the dovetails, but closing the wedges fails to grip the BXA adequtely (still slop).

    Is there an intermediate size? Did DTM make proprietary sizes?

    Any help would be appreciated and a much needed distraction from COVID!!!

    Thanks

    20200321_203428.jpg

    20200321_203358.jpg

  2. #2
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    I have the AXA size DTM tool post. Some of my Aloris holders almost bottom out on the post, where some of the import holders fit just right. They are very nice tool post and I like mine, never go back to a Aloris or an import for this one. Ken

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    The DTM seems to be extremely well made--I agree. I only have import AXA holders, and they are just a hair too small (width of female slot). The BXA holders I have slide over the dovetail, but the female side on the toolholder is clearly too deep. I may try some other AXA toolholders from a different manufacturer.

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    Quote Originally Posted by Niwot View Post
    I acquired a DTM quick change toolpost. The identification plate has been removed. An AXA toolholder does not fit on the dovetails. A BXA toolholder fits on the dovetails, but closing the wedges fails to grip the BXA adequtely (still slop).

    Is there an intermediate size? Did DTM make proprietary sizes?

    Any help would be appreciated and a much needed distraction from COVID!!!

    Thanks

    20200321_203428.jpg

    20200321_203358.jpg
    To my eye, it looks like the moving wedge is installed upside down.

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    I have a DTM and an Aloris CXA, all my tool holdrs work just fine on either post. Mix of aloris, dorian, armstrong, and dtm holders, I only have one toolholder is an import and it also works in both.
    Agree that the wedge looks funny.

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    A few years ago I had an opportunity to mix-and-match Aloris and DTM BXA tool posts and holders plus one Dorian BXA tool holder. BTW DTM called their BXA size "Series 75" Here's what I found:

    1.Of the four DTM tool holders, three are too tight to go on an Aloris BXA tool post and one just fits. They all fit the DTM tool post fine.

    2. Conversely five Aloris brand BXA series tool holders were tried on the DTM tool post. Two fit OK, three feel like they lock at just the point the moving wedges on the tool post reach the end of their travel.

    3. A Dorian brand BXA holder remains loose when the DTM tool post’s wedges are at the end of their travel. This tool holder fit the Aloris BXA post fine.

    For sake of completeness I should add the five Aloris brand BXA holders fit the Aloris tool post fine.

    Both posts and all holders were near new to low hours of usage.

    David
    Last edited by old_dave; 03-22-2020 at 12:33 PM. Reason: Another bit of info

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    Quote Originally Posted by Joe Gwinn View Post
    To my eye, it looks like the moving wedge is installed upside down.
    Quote Originally Posted by Rob F. View Post
    Agree that the wedge looks funny.
    I partially disassembled the toolpost today. The wedges can only go in the post one way, and they are "right and left handed," which is to say that each wedge has a dedicated slot, and only fits in the proper orientation.

    Hmmmmmmmmm?

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    I have one DTM holder but not a post of that brand. However, I'll add my voice to those saying that the wedge looks off. Specifically, too high. It should be lower, and should lock up a larger dovetail solid.

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    I have only used piston-style tool posts. This is my first wedge-style, so I don't have a good feeling for what it is supposed to look like.

    The general consensus is that the wedges are wonky. For those who have a DTM setup, would someone mind posting some pics of their post for comparison (full open and full closed positions)? Thanks!

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    Here's pictures of my DTM 65 (AXA) tool post. It is shown in the released position, wedges in the up position20200324_124135_resized.jpg.20200324_124207_resized.jpg20200324_124148_resized.jpg

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    4GSR: Thank you for posting those pics!

    It seems to me that, upon first blush, that the wedges protrude rather high up the dovetail, and are not appreciably different than mine. I still need to take a closer look with my toolpost in-hand, however.

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