Threading Question

[Dave in WI]

Is yours single phase as well? Makes threads look just like that.

Yes @Dusty Stevens , single phase.

 

[Dave in WI]

I have the same lathe, I use cheap carbide inserts at 70rpm. Dark ridgid cutting oil and compound set at 30-29.5 but the last few pass I go strait in with the cross slide to clean up both sides, also I thread at 200RPM the last few passes.

I also put vibration dampers between my motor and lathe, do the 1phase motor doesn’t transfer to the lathe.

I have put rubber between motor and lathe as well as it was suggested to me. It didn’t help in my case.

 

[Judd]

Is yours single phase as well? Makes threads look just like that.

Mine is and they do lol

I normally finish with a thread file and a burgundy scotchbrite and that combined with small cuts at the end can normally clean them up.

I don’t have the testicular fortitude to thread any faster than 190 tho and I thread toward the shoulder versus away.

 

[WSnyder]

it provides it the right angle of approach

Commonly known as helix angle. Most every inserted tool I’ve had comes with the correct shim for the most common thread pitches and material diameters. All the tool manufacturers have charts to help pick the correct shim. There are times you may need a negative shim. Negative shims are used when turning left-hand threads with right-hand tools, and vice versa. If you’ve never looked at this (helix angles in thread turning) it might pay to familiarize yourself with it.

 

[LVLAaron]

Shims. You guys are using shims?

 

[Walt Krafft]

I stopped using threading tools that needed shims 30 years ago.

 

[SKWERLZ]

Mine is and they do lol

I normally finish with a thread file and a burgundy scotchbrite and that combined with small cuts at the end can normally clean them up.

I don’t have the testicular fortitude to thread any faster than 190 tho and I thread toward the shoulder versus away.

Watch a joe Pie threading video on YouTube
He threads away from shoulders so timing is a non issue

It’s really easy if you can run your lathe in reverse.



I run a hardinge HLV and it has a easy to set stop so threading is incredibly easy with them.

 

[shortgrass]

Watch a joe Pie threading video on YouTube
He threads away from shoulders so timing is a non issue

It’s really easy if you can run your lathe in reverse.



I run a hardinge HLV and it has a easy to set stop so threading is incredibly easy with them.

Oughta' try that with a chuck threaded on the spindle...... Make sure and wear your armour and crash helmet.

 

[SKWERLZ]

Oughta' try that with a chuck threaded on the spindle...... Make sure and wear your armour and crash helmet.

Yea, that could get exciting!
Lol!

 

[WSnyder]

Shims. You guys are using shims?

The shim is the insert under the insert on your indexable laydown thread tool holder. It’ll have a reference number on it.

Sandvik Coromant

www.sandvik.coromant.com

 

[Spotshooter]

The shim supports the carbide right up to the cutting edge…

Rigidity is always good… and when you have a ‘screw down‘ insert at the end of a tool … well they put the shim there to support it more soundly…

Yeah I knew the rake / angle thing - but a man has to leave something for the editors…
it’s the Internet Dern it … lol..

 

[Dusty Stevens]

The shim supports the carbide right up to the cutting edge…

Rigidity is always good… and when you have a ‘screw down‘ insert at the end of a tool … well they put the shim there to support it more soundly…

Yeah I knew the rake / angle thing - but a man has to leave something for the editors…
it’s the Internet Dern it … lol..

What theyre saying is the modern designs do not use the shims

 

[LVLAaron]

Understanding carbide insert tooling requires a phd. I've got 2-3 threading holders and a dozen different types of inserts... the only thing that came with shims is my Kennametal holder... If there are different shims I sure dont know about them.

 

[Judd]

Watch a joe Pie threading video on YouTube
He threads away from shoulders so timing is a non issue

It’s really easy if you can run your lathe in reverse.



I run a hardinge HLV and it has a easy to set stop so threading is incredibly easy with them.

I’ve seen his video…just not something I’ve tried/experimented with and I’ve got a D1-5 chuck so I could run in reverse.

 

[LVLAaron]

I’ve seen his video…just not something I’ve tried/experimented with and I’ve got a D1-5 chuck so I could run in reverse.

Make sure your carriage isn't going to "lift" off your ways.

 

[WSnyder]

My toolholders are Iscar but my shims are Vardex. Iscar and Vardex shims are interchangeable.
This’s is what a set looks like:

 

[xr650rRider]

Make sure your carriage isn't going to "lift" off your ways.

If that happens, you probably shouldn't be using a lathe.

 

[GenePoole]

I like Joe Pie, but I cringe every time I see that inverted reverse threading thing. Just learn to do threads correctly. My mentor rolls in his grave.

 

[ronsatspokane]

The shim supports the carbide right up to the cutting edge…

Rigidity is always good… and when you have a ‘screw down‘ insert at the end of a tool … well they put the shim there to support it more soundly…

Yeah I knew the rake / angle thing - but a man has to leave something for the editors…
it’s the Internet Dern it … lol..

The lay down threading tool I use has the shim as well. It cuts very clean threads. It is a newer tool. Maybe 4 years old. When I first got it I wondered what was going on. The shim looks like a cutting tool. It is just a support for the cutter.

 

[LVLAaron]

If that happens, you probably shouldn't be using a lathe.

Not all carriages are on the ways with much more than the weight of the carriage. It's meant for downward pressure... so you lift up on it with an upside down tool and I'd say you're more apt to chatter than before.