Threading

[seacoast_machinist]

Hello all.
I am a machinist with @36 years experience. Was wondering if there would be interest here for me to post info about threading? Was specifically thinking about tooling for threading. ID, OD threading tools, cresting inserts,thread relief tools for ID and OD. Will wait for feedback.
Have good day.

[[cerberus]]

I would like to read anything you have to offer.

[ChimeraPrecision]

Please Do friend i would greatly appreciate it

[Samson104]

Absolutely , im alwas interested to hear how others do it

[Wallygator]

I would also love to hear and maybe see how you do it.

[madeInSA]

I don't see why anyone would have a problem with getting advice from someone as experienced as you.
I'm always up for listening to someone that knows better than me, and certainly on the topic of threading where I think a lot of people on here could use some good advice.

Post away

[mscott]

Let's here what you have to say about cutting internal threads??? That's probably as important to this forum as anything.

[bakerjw]

A stupid man ignores the experienced.

Post away and welcome to Silencertalk.

[Historian]

Add my "Welcome Aboard".

Those of us who have had the privilege of working around talented
machinists marvel at the 3-D mental acuity, perceptive analyses, setting up,
and final resulting artistry in metal from you and your brethren.

Your kind offer to dispense your years of wisdom is awaited with
open arms ( in all meanings ).

[PaulNoiseLess]

Hi,

Like "Duke Nukem" used to say: What are you waiting for ?, Christmas ?

Welcome to the Jungle !

Best,

Paul

[tmix]

I'm a pseudo-machinist with 8 years of practice, but very little instruction.(no professional instruction, anyway.)
I can thread barrels all day long, no problem.

I'd like some input on threading tools, especially the tool material type, coatings, etc.
What tool type would be optimal for different materials. Aluminum, stainless, etc. Do TiN coated inserts work best for ferritic steels? Is HSS the best for stainless? Things like that.

Also,
Feeds and speeds for threading. I usually cut my 1/2x28 and 5/8x24 threads at 60 rpm. I could cut faster, but I'm afraid of breaking my insert. I get cleaner threads at 60 rpm that I do at 25 rpm. Any input on this would be interesting.

[ghostdog662]

Like tits in the face, we will take it.

[seacoast_machinist]

Ok , cool. I appreciate the warm welcome from all. I think it would be best to do this as a multi part posting.
1) discussion of tooling with pictures of said tooling. tooling will include cutting tools and measurement tools . ID and OD thread tools, cresting inserts of OD threading,thread relief tools will be included.
2) set up of tooling , methods of aligninment , center height , use of thread wires
3) OD threading , setting compound angle and little bit of theory as to why 29.5 degree is used
4) ID threading , and using previous external part as function gauging
5) Wrap up and responding to any questions generated

I do have a question,,,,,how is best way to post pictures here? I plan to take pictures of various threading tools, and inserts i have in my toolbox.
Any comments are appreciated.
Thank you

[Bendersquint]

Ok , cool. I appreciate the warm welcome from all. I think it would be best to do this as a multi part posting.
1) discussion of tooling with pictures of said tooling. tooling will include cutting tools and measurement tools . ID and OD thread tools, cresting inserts of OD threading,thread relief tools will be included.
2) set up of tooling , methods of aligninment , center height , use of thread wires
3) OD threading , setting compound angle and little bit of theory as to why 29.5 degree is used
4) ID threading , and using previous external part as function gauging
5) Wrap up and responding to any questions generated

I do have a question,,,,,how is best way to post pictures here? I plan to take pictures of various threading tools, and inserts i have in my toolbox.
Any comments are appreciated.
Thank you

Imageshack.us is the best way to do it.

Create an account so you can control the deletion or whatnot of it.

-B

[PaulNoiseLess]

Hi,

OK, while OP set ups the account for Pic, i have a question:

Yesterday I did thread a SS insert for an Alu Can. I have used a Tap in the Lathe with the Taps holder I have. Threading is 1/2 – 28 TPI and just run out of 15/32 Drills. I did drill at 11.75 mm (0,4625 inches).

I did very slowly getting in and out (you know, the swing …) and oiling. I spent some extra time but threads looks really good.

My question is: What percentage of threads I’ve got ?. I read somewhere that 15/32 is 75% but not sure.

Thanks.

Best,

Paul

[SRM]

Hi,

OK, while OP set ups the account for Pic, i have a question:

Yesterday I did thread a SS insert for an Alu Can. I have used a Tap in the Lathe with the Taps holder I have. Threading is 1/2 – 28 TPI and just run out of 15/32 Drills. I did drill at 11.75 mm (0,4625 inches).

I did very slowly getting in and out (you know, the swing …) and oiling. I spent some extra time but threads looks really good.

My question is: What percentage of threads I’ve got ?. I read somewhere that 15/32 is 75% but not sure.

Thanks.

Best,

Paul

I made an adapter and it was .004" smaller than that. I did it with a tap.

One trick I found, after tapping to do the od thread, is to chuck a scrap piece and cut a 1/2 thread and screw the tapped part on lightly and face cut. Flip over and repeat a couple times. then cut the od threads. comes out pretty good!

[Sergeant]

I just got a bench top lathe and a bunch of carbide tipped bits, boreing bits, etc... All kinds of shapes. I have no idea what most of them are for. I would be Real interested.
Steve

[seacoast_machinist]

Hello , sorry took me so long to get back. I hope the pics will post correctly


Top left are two internal threading tools : top one is threading only, one below it will accept thread inserts and groove inserts.

Extreme left botom is a 60 / 90 chamfer tool , left side of tool also chamfers lead edge of a bore.

Next to this is OD thread tool, as can be seen by inserts arrayed in front of it: large threading, radius grooving, standard grooving, and deep grooving. Insert in the tool is a cresting insert.

Next two tools are OD threading,grooving tools with 3/4 and 5/8 shank

Last took on bottom is a insert Iscar cut off tool.

Top right are boring tools: top one is a 3/8 shank insert type in home made square block for holding in tool post holder.

Two below this: end mills make excellant boring bars in emergencys .

I`ll discuss these tools in more depth next posting.

Any questions,,,,,fire away please

[seacoast_machinist]

Close up of threading tools

[Capt. Link.]

Bottom left tool is very interesting is it a old design or a special tool you designed.

[seacoast_machinist]

It is an old design tool from work. Works great in manual lathes for chamfering, is brazed carbide.