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Thread: MT1 Tool Extractor..Sherline or Small Lathe..Prints

  1. #1
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools

    MT1 Tool Extractor..Sherline or Small Lathe..Prints

    I had been using the old method of placing a 3/4-16 nut on the spindle prior to installing the MT1 tool holder.
    Sherline 2000 Mill MT1 Tool Extractor
    However I have been known to forget to put the nut on prior to installing the tool.

    So I checked the spindle diameter and found it to be close to the diameter for threading to 7/16-20.
    I used a spiral machine tap and it threaded to 3/4" deep without any problems. The back end of
    the spindle is not all that hard. I wanted at least 1/2 inch of thread engagement for the extractor.

    Next I needed an "extraction tool" to push the taper out of the spindle and came up with this:

    Two were made. One for short MT1 adapters and one for Long MT1 adapters.
    Both were made using standard grade 5 bolts and plated steel rods.
    Bolts were faced and drilled on the lathe using the brass adapter and lock nut with a .250" hole .500" deep.
    Next the rods were cleaned up and turned to .330".
    Then one end of each rod was turned to .250".
    All that remains was to solder the two pieces while holding them in alignment in the lathe.
    Threads were chased with a standard threading die to clean them up.

    Presto, I now have a way to remove MT1 tools without ever pounding on my Sherline lathe or mill.
    This method may work on Taig or other bench top tools.

    Cheers, JR
    Attached Thumbnails Attached Thumbnails MT1 Tool Extractor..Sherline or Small Lathe..Prints-img_2637mt1_tools.jpg   MT1 Tool Extractor..Sherline or Small Lathe..Prints-img_2638_mt1_parts.jpg   MT1 Tool Extractor..Sherline or Small Lathe..Prints-img_2639_mt1_extractor.jpg  
    Attached Files Attached Files
    Back to the shop.

  2. The Following 4 Users Say Thank You to jjr2001 For This Useful Post:

    Jon (07-02-2020), mklotz (07-02-2020), old_toolmaker (07-04-2020), Paul Jones (07-07-2020)

  3. #2
    Supporting Member mklotz's Avatar
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    mklotz's Tools
    The inertia type, e.g....

    Lathe spindle tools

    are typically termed "knockout bars" so I guess that makes your version a "screwout bar". On second hand, that doesn't sound like something one would say in polite company so better to stick with "extraction tool" which only ignites images of dentists.

    Now that you have the left end of the spindle threaded, you might want to think about making a steady for those cases where you're turning long items with a lot of stick out. Beyond the risk of bending into a thrasher, long items inside the spindle can vibrate and rattle which can be distracting. Perhaps it's not as much a problem on smaller lathes as it is on the larger ones.

    My version is nothing more than an aluminum faceplate-like device that threads onto the existing male threads on the left end of the spindle. Three slotted "jaws" (actually Unimat milling clamps) bolt on the faceplate and keep the workpiece roughly centered so it doesn't vibrate. (A separate wooden rod with various sized holes bolts to an adjacent table and prevents whipping on those rare occasions when I turn long stuff.)
    ---
    Regards, Marv


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    http://www.myvirtualnetwork.com/mklotz

  4. The Following 3 Users Say Thank You to mklotz For This Useful Post:

    jjr2001 (07-02-2020), old_toolmaker (07-04-2020), Paul Jones (07-07-2020)

  5. #3
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools
    Thanks Marv, Good idea for a steady or spyder device for the spindle. It would be easy to buy a few extra 7/16-20 x 1/2" long bolts and just drill them out to the desired diameter for thin rods...

    Cheers, JR
    Back to the shop.

  6. The Following 2 Users Say Thank You to jjr2001 For This Useful Post:

    old_toolmaker (07-04-2020), Paul Jones (07-07-2020)

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    Thanks jjr2001! We've added your MT1 Tool Extractor to our Lathe Accessories category,
    as well as to your builder page: jjr2001's Homemade Tools. Your receipt:




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    jjr2001 (07-04-2020)

  9. #5
    Supporting Member old_toolmaker's Avatar
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    old_toolmaker's Tools
    jjr2001,

    Nice work and certainly solves your dilemma. I have used brass tipped knock out bars in lathes for years but they can cause a jarring force to equipment which is not necessarily a good thing and is better avoided if possible. I have an adjustable backstop for my lathe spindle which can be used as an MT extractor when needed.
    Thanks for posting this!
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

  10. The Following User Says Thank You to old_toolmaker For This Useful Post:

    jjr2001 (07-04-2020)

  11. #6
    Supporting Member old_toolmaker's Avatar
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    old_toolmaker's Tools
    jjr2001,

    I looked at your drawing. May I ask what CAD program you use?
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

  12. The Following User Says Thank You to old_toolmaker For This Useful Post:

    jjr2001 (07-04-2020)

  13. #7
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools
    Thanks for your comments Dick, I have dabbled with a lot of cad pgms including Autocad, Inkscape, Sketchup, and Alibre.
    I find that TurboCad (once you get the hang of it) is extremely versatile with more functions that I will ever learn.
    I now use TurboCad for all of my 2D drawings. After years of working with it I find it "easy"..

    Cheers, JR
    Back to the shop.

  14. The Following 2 Users Say Thank You to jjr2001 For This Useful Post:

    old_toolmaker (07-04-2020), Paul Jones (07-07-2020)

  15. #8
    Supporting Member old_toolmaker's Avatar
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    old_toolmaker's Tools
    Thanks, JR!
    I am currently trying Libre Cad.
    I think I will get along well with it but as with anything new, there will be a learning curve.
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

  16. The Following User Says Thank You to old_toolmaker For This Useful Post:

    jjr2001 (07-05-2020)

  17. #9
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools
    Libre Cad is a great 2D program and you can find a lot of tutorials and examples on youtube.
    I have learned almost everything I know about Turbocad from the tube!

    Cheers, JR
    Back to the shop.

  18. The Following User Says Thank You to jjr2001 For This Useful Post:

    old_toolmaker (07-06-2020)

  19. #10
    Supporting Member old_toolmaker's Avatar
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    old_toolmaker's Tools
    Hi jjr2001,

    Thanks for the YouTube tip. I continue to read and practice, but I don’t often think of using the Tube.
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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