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.
https://www.homemadetools.net/forum/...669#post108022
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

The inertia type, e.g....

https://www.homemadetools.net/forum/...le-tools-27805

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.)

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

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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:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-mt1-tool-extractor-2"> <img src="/uploads/234255/homemade-mt1-tool-extractor-2.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-mt1-tool-extractor-2">MT1 Tool Extractor</a> <span> by <a href="https://www.homemadetools.net/builder/jjr2001">jjr2001</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/lathe'>lathe</a>, <a href='https://www.homemadetools.net/tag/extractor'>extractor</a> </div> </div> </div> </div>
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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!

jjr2001,

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

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

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.

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

Hi jjr2001,

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

One .PDF file and a couple of links that are of interest to Librecad users.
You may find them useful.
The .PDF is a good primer on Isometric and Orthogonal drawing.
The links are just reference material.

Here they are.

Cheers, JR

Some Links:
https://heikell.fi/downloads/LibCAD_220rc1.pdf
https://librecad.readthedocs.io/en/l...damentals.html

mklotz,

Nice idea for making a small spider for the spindle. I never thought about doing that! Thanks for posting!

jjr2001,

Thanks for posting the links on LibreCad. I have the heikell.fi download on my kindle now for ready reference when I am working/learning. Happy to have that.
My Cad experience goes back decades starting with Cadkey in the early eighties. I have used this software to the present day which is now known as Key Creator. My computer crashed so I am starting over. It is hard to start out from scratch but i will make it.

Sorry to hear about your crash....I hate it when that happens!!.

I do not use any virus or commercial backups or the cloud.....
I just have my own little system of collecting and saving my data/files/programs on hard drives located in various places.
Even with that it is a royal pain when I have to restore a system. However, it nice to know that I have all of my "Stuff" somewhere!

Happy cadding, JR

jjr2001,
Do you know of any CAD file converter that can read or convert .prt files?

I believe that Autodesk Fusion 360 and Adobe Acrobat DC will open them.
I think Acrobat DC is the pay for version of Acrobat.
Fusion 360 free should open them.

Cheers, JR

jjr2001,
I have been using TurboCAD since the early 1990's and wish they had kept it simple. There are now more special features and multiple ways for doing the same functions. Unless you are using TurbCAD everyday it is difficult to start up from where you left off. There used to be a wonderful website at www3.turbocadcommunity.com for help but it disappeared in September 2017.
Paul

Thanks, JR!
Your suggestions are good leads and I may be able to salvage some of my work yet.

Quote:

---

Originally Posted by Paul Jones

jjr2001,
I have been using TurboCAD since the early 1990's and wish they had kept it simple. There are now more special features and multiple ways for doing the same functions. Unless you are using TurbCAD everyday it is difficult to start up from where you left off. There used to be a wonderful website at www3.turbocadcommunity.com for help but it disappeared in September 2017.
Paul

---

Hi Paul, the evolution of add more stuff just continues. I do remember www3.turbocadcommunity.com and miss its demise. I have Turbocad V21 and that is where I stop. I do not use 25% of the features but I like the tools I have become accustomed to. I do not care for the new pay per month or yearly subscription craze. Everyone wants to be the phone company. I prefer to buy once and use it as long as I like it.

Reminds me of the free Google Sketchup. I learned how to make detailed airframe parts for RC models and then they stabbed us in the back, sold it to Trimble and now it is a subscription...I do have an old copy and can use it if I have to but just don't want to put more effort in something that you cannot buy. I remember enough of it to be dangerous!

I think Win10 will be my last operating system for the same reasoning. It does everything I need it to and I own it on several machines....

Cheers, JR

That is great Dick, glad to be of help.
Cheers, JR

JR,
I too have not upgraded my TurboCAD. It is the last 64-bit version running on Windows 10 I will buy. The only thing I had to change was the TurboCAD finest line widths displays to be seen easily on my 4k computer screens. BTW, Windows 10 comes with a simple 3D CAD app for drawing objects and exporting STL files for 3D printing. It the free Microsoft 3D Builder found under the drop down menu "Windows Accessories".
Paul

Hi Jr,

I used CadKey and then Key Creator for years. Every year another $$$$ to pay to stay current with unneeded upgrades. I’m not opposed to learning but for a hobby there are limits.

Thanks for the tip Paul, I did not know that existed. Tinkercad is similar but browser based and who knows when Autodesk will make it a subscription.
I have Alibre for solid work and need to spend more time learning it. Looks real good so far. I did not buy the full version but I think this "limited" version will work for me and it was in a reasonable price range for hobbyists.

Dick, the constant upgrade thing just makes more work for me. Frequently I just use what I have on my computer since these programs are really at a great level at this time. Back in the day it was a good idea to get new versions every now and again but I don't upgrade much now.

Computing is good!

Cheers, JR

jjr2001,

Thanks for directing me to YouTube for LibreCad tutorials. I found some great videos and I learned a lot in 1 hour. I don’t feel like a “deer in the headlights” and that is progress!

Indeed, There are some very good Youtube tutorials out there and some are very entertaining also.
Cheers, JR

jjr2001,
I learned more today than I ever expected. This is the kick start I needed. I now feel quite confident I will do great with LibreCad!
Thanks

That's great Dick, Making the drawings is half the fun and I find a lot of re-work or bad parts
are prevented with good drawings.

Cheers, JR

You are so right, JR
I enjoy drawing. It is the tool designer in me.

Indeed...Keep on Drafting and Building.
Cheers, JR

jjr2001,
I intend to keep drawing and practicing a little each day. I am getting a little more proficient each day and when I run into a wall I ask google for help. I have also been keeping a notebook to record how I did certain actions that were not intuitive or obvious. That has been good for reinforcement.

Awesome. I do about the same thing.....now where did I put that note!
Usually I will make a text file or MS Word file and save it on my HD.
If you find something you like on the net, such on Goggle, you can simply highlite it (including pictures) and paste it into MS Word
and usually come up with a nice document for future reference. I do that a lot!
It is a good thing to do since a lot of stuff disappears over time. Especially pictures posted on the likes of PhotoBucket.


Cheers, JR

JR,
Thanks for the tip! I’m going to put it to good use!

You are very welcome Dick.
Cheers, JR

jjr2001,

What are you working on now? Or are are you taking a well deserved breather?

Quote:

---

Originally Posted by old_toolmaker

jjr2001,

What are you working on now? Or are are you taking a well deserved breather?

---

No No No....No breather....Need to make more tools for the shop.

Two small projects for the Sherline. One for the lathe and one for the mill pallet.
Just a couple of easy items.

(oh yea, after using cad for the last 35 years or so I am still refining what I can do in TurboCad.)
The more I use it the more I like it!

Cheers, JR