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Old 05-05-2018, 02:01 PM   #1 (permalink)
 
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Default tooling for threading

Hello,

I want to start threading without taps and dies. I am having a difficult time finding the proper tool for threading. It seems like I have only found tooling for internal threads that has a minimum bore of 1/2 inch, which is fine for M14, but if I wanted to do smaller size for cap or whatever I would need a smaller tool, unless I am totally not understanding this.
https://littlemachineshop.com/produc...3570&category=

I've looked around but I think the more I search the more I get confused and lose track of what I have found.

It would be nice to find some tooling a little cheaper too... I want replaceable carbide inserts as well. I hate sharpening and I am in fact terrible at it.
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Old 05-05-2018, 02:11 PM   #2 (permalink)
 
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I found this. Minimum bore of 11mm which is better

https://www.amazon.com/SNR0008k11-8x...70_&dpSrc=srch
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Old 05-05-2018, 03:30 PM   #3 (permalink)
 
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Default tooling for threading

You can make your own internal threading tool using drill rod. Machine a 60 deg taper from both sides and grind it down just past half way and on the back side leaving a 60 degree tip on a small diameter rod. Taps are so much easier to use and repeatable though.
You will have to heat above where the steel no long sticks to a magnet and quench to harden.

Danny

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Old 05-05-2018, 06:57 PM   #4 (permalink)
 
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Lewis,

I'm with you, especially for i.d. threading. Go to thinbit.com and download their catalog. They specialize in small bore tooling. Unfortunately, they ain't cheap. Their stuff is available on Amazon.

Here are the Thinbit part numbers for what I use if you want to check them on Amazon:

Toolholder: MGT14 (Threads down to 8.25mm i.d.)
Threading tool: MGTTD5L
Tool Adapter: AD38 (You can make this yourself)

I went through this a few years ago, small bore tooling is hard to find.

PM me if I can help.

Bill
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Old 05-05-2018, 08:50 PM   #5 (permalink)
 
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Dan - I will thread with taps and dies most of the time but I want to make my own pistons or have the freedom to do different threads when I want for caps, but especially for nibs. I also want the freedom to make threads for other proprietary items like vacuum pumps.

Oh, and I hate sharpening!

Bill, thank for the links! I'll check them out for sure and I will most likely be hitting you up!
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Old 05-05-2018, 09:15 PM   #6 (permalink)
 
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The first tool you show does seem exorbitantly expensive but I have noticed the same with other brands also. The fact that you get 3 cutters contributes to the price of course.

The minimum bore of 1/2" that you are finding is probably because the tool needs to be able to withstand the lateral stress without significant bending.
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Old 05-05-2018, 09:40 PM   #7 (permalink)
 
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Lewis,

Thinbit tooling looks very good nice price.

Below tooling higher in price, but gives you an idea of other manufacturers.

If you go more than 4:1 extension, experience chatter, carbide bars are rated for 6:1.

ISCAR Cutting Tools - Metal Working Tools - MGCH

https://www.cmtindustrial.com/catalogue/product/799041

https://www.mscdirect.com/product/details/82301219

https://www.secotools.com/#article/m_7210
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Old 05-06-2018, 07:03 AM   #8 (permalink)
 
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Mal and Smik,

Good point on strength. If my vision of a piston system design is correct, I shouldn't need to extend the tool very far on internal threading situations, so I don't think the high dollar tools will be needed.
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Old 05-06-2018, 10:04 AM   #9 (permalink)
 
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Quote:
Originally Posted by stuckinohio View Post
Dan - I will thread with taps and dies most of the time but I want to make my own pistons or have the freedom to do different threads when I want for caps, but especially for nibs. I also want the freedom to make threads for other proprietary items like vacuum pumps.

Oh, and I hate sharpening!

Bill, thank for the links! I'll check them out for sure and I will most likely be hitting you up!


You also have the option for making your own specialty taps. That way you spend the set up time once for threading the tap instead of each and every pen. You also reduce the risk of failures in your pen blanks. Quality control in an external thread is a bit easier than an internal thread. Especially for small diameters.

However learning to ID thread on the lathe will be a good learning experience. I look forward to seeing your results.

Danny


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Old 05-06-2018, 10:09 AM   #10 (permalink)
 
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I use either W1 or O1Tool steel (drill rod). See this link: Making your own specialty taps. Bock 5 mm


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