internal threading toolholder reccomendations?

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jaredr
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internal threading toolholder reccomendations?

Post by jaredr »

i can't sharpen HSS lathe bits worth a damn, maybe will do more practicing on the grinder when I win the lottery and have copious amounts of spare time. until then, i'm going back to indexable inserts. any recommendations on toolholder that will fit in a min bore of .4" or so? Looking at carmex, pricey but generally gets good feedback on machinist forums. shars has some stuff that is less expensive (http://www.shars.com/product_categories ... ol_Holders but not sure that's always the best route. what are you all using?
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apd855
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Re: internal threading toolholder reccomendations?

Post by apd855 »

I use this one and love it, but looks to be a little bigger than your spec. on min. bore.

http://www.shars.com/products/view/7807 ... uot_Insert
jaredr
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Re: internal threading toolholder reccomendations?

Post by jaredr »

apd855 wrote:I use this one and love it, but looks to be a little bigger than your spec. on min. bore.

http://www.shars.com/products/view/7807 ... uot_Insert
yeah, i was looking at that but it's a bit of tight fit. they offer a miniature internal threading toolholder that goes down to around .25" min bore and then another size up that around .37" - for $35 plus another $10 for the insert, i'll probably give it a try.
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ChimeraPrecision
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Re: internal threading toolholder reccomendations?

Post by ChimeraPrecision »

Shar's has a brazed carbide mini threading bar that is super cheap.
I cut internal threads with it with ease all day. Works perfect for one off jobs like form 1 cans
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Capt. Link.
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Re: internal threading toolholder reccomendations?

Post by Capt. Link. »

Tool holders are expensive.These are available in carbide and require no holder. MSC single point threading tool

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Historian
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Re: internal threading toolholder reccomendations?

Post by Historian »

Jaredr, it took me a long time to figure out how to sharpen
HSS tool bits. For me the key was a magnifying glass, oil stone
(e.g., hard Arkansas or such) , and
flat diamond files that are very cheap in the tool catalog mailers.

1. Grind shape with proper angles as per any lathe book.

2. Use glass to see the intersections of the planes. Surprise!
Not a line, as in high school geometry but round ... great for
burnishing but not for cutting.

3. Now use the diamond file flat on the side slanted planes
to slowly get a sharp edge. Multiple views with lens will
show progress. After about 10 minutes you will see a knife
edge ... no roll over.

4. Place on oil stone and move it gently to polish.
You will be amazed how pretty and very sharp are the lines of intersection
where the planes meet.

Note, where the three front planes meet, looking down from the top,
round the point (intersection of three non co-parallel planes is a point -Euclid )
gently round the tip.

Any video on you tube by Tublacaine will be most informative.

<< http://www.youtube.com/watch?v=hrDr4rYLiAk >>
<< http://www.youtube.com/watch?v=dRyqIm5JR5s >>

Now, with the tool accurately centered with the piece you are turning,
you can cut and thread like butter.

Best.

Note: As with all my studies my OCD demanded that I get a drawer full of
12" x"3" x .5" oil stones (e.g., hard white and black Arkansas, India, etc.;
and all the grades of Japanese wet stones ). My Randall knives are honed
to literal razor edges. A dull knife, like a dull mind, is dangerous; in the later
it makes one a Democrat. :)
grrifles
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Re: internal threading toolholder reccomendations?

Post by grrifles »

Take a tap and grind everything away but one tooth. There is a good internal or external threading tool.



Chris
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Bendersquint
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Re: internal threading toolholder reccomendations?

Post by Bendersquint »

jaredr wrote:i can't sharpen HSS lathe bits worth a damn, maybe will do more practicing on the grinder when I win the lottery and have copious amounts of spare time. until then, i'm going back to indexable inserts. any recommendations on toolholder that will fit in a min bore of .4" or so? Looking at carmex, pricey but generally gets good feedback on machinist forums. shars has some stuff that is less expensive (http://www.shars.com/product_categories ... ol_Holders but not sure that's always the best route. what are you all using?
Those wil suit you fine for limited runs, if you do more than a couple I would get the Carmex or other high end toolholders.

If you are internally threading SS or Ti you are going to want the better toolholders for better rigidity.
Doc Holiday13
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Re: internal threading toolholder reccomendations?

Post by Doc Holiday13 »

I have 2 indexible holder one internal and one external. both by hertel. Inserts are like $12 each and last for a long freaking time. I can probably get 20 thread jobs out of one insert. Both tools and 3 inserts each from MSC on discount were like $200

In hindsight I probably should have gotten an "on edge" external threader instead of "lay down" because it appears you get a little more shoulder clearance for when you are threading close to the shoulder
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