How do I turn parts that don't clear the cross-slide?

S

SJB001

Plastic

Joined

Jan 22, 2022

• Jan 22, 2022

• #1

Hi,

Thanks for taking the time to read my post.

I am relatively new to machining and have a problem to which I hope there's a simple answer. I am trying to turn a part on my lathe (HAAS TL-2). This is a large part (~400mm diameter). It clears the bed no problem, but it doesn't clear the cross-slide (max clearance over cross-slide is ~270mm I think).

I have a Dorian tool-post and my conventional turning tools sit on the left hand side of this, tool holder perpendicular to the Z-axis. The cutting point is more-or-less over the cross-slide so I am unable to turn any part that does not clear this.

I need to turn for a length of ~200mm so I somehow need to use a tool that sticks-out a long way to the left of the cross-slide so as to turn this part without it hitting the cross-slide.

Any thoughts/ideas would be much appreciated!

Thanks

SJB

 

Phil in Montana

Stainless

Joined

Jul 31, 2007

Location

Missoula Mt

• Jan 22, 2022

• #2

You dont...Phil

 

I

implmex

Diamond

Joined

Jun 23, 2002

Location

Vancouver BC Canada

• Jan 22, 2022

• #3

Hi SJB001:
You need a big stout left hand boring bar so you can hang it out more than 200 mm.
Take light cuts.

Maybe wrap it tightly with sheet lead to keep it from singing.

What material are you planning to cut?
Aluminum or plastic no problem.
4140 prehard maybe not so much.

Chees

Marcus
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining

 

Richard King

Diamond

Joined

Jul 12, 2005

Location

Cottage Grove, MN 55016

• Jan 22, 2022

• #4

I had that happen a few times way back when. In some cases you can use a Boring Bar on the OD of parts as a tool. It can only be down on short parts. I just spent 30 minutes looking for an example on You Tube, but couldn't find anything. You can also install Riser Blocks under the head, tail stocks and raise the tool post.

 

G

Garwood

Diamond

Joined

Oct 10, 2009

Location

Oregon

• Jan 22, 2022

• #5

Bolt a big chunk of steel in place of the toolpost. Mill a slot for the toolholder. I have gotten a bunch of these custom reach around toolholders with machines over the years and saved them. Every once in awhile they come in handy.

 

Conrad Hoffman

Diamond

Joined

May 10, 2009

Location

Canandaigua, NY, USA

• Jan 22, 2022

• #6

Give me a long enough lever and I'll move the earth. Give me a moderate length lever and I can probably bend or break something expensive. Light cuts only!

 

H

HappyWyo

Aluminum

Joined

Nov 30, 2019

• Jan 22, 2022

• #7

Here is how we do it.
https://youtu.be/P4PWm3zGcQc

 

S

SJB001

Plastic

Joined

Jan 22, 2022

• Jan 24, 2022

• #8

Hello All,

Thanks for taking the time to reply, really appreciate your advice!

I'm going to to give the left-handed boring bar a try. I might be able to get away without sticking it out the full 200mm because I'm turning a taper on the OD. Once I've roughed down the front a bit I may be able to get the cross-slide under the part for some distance.

Thanks again!

SJB

 

Ox

Diamond

Joined

Aug 27, 2002

Location

Northwest Ohio

• Jan 25, 2022

• #9

The bar doesn't need to be LH.
You have M4 on that machine I ass_u_me?


---------------

Think Snow Eh!
Ox

 

B

BT Fabrication

Titanium

Joined

Nov 3, 2019

Location

Ontario Canada

• Jan 28, 2022

• #10

outsource it?

 

Cole2534

Diamond

Joined

Sep 10, 2010

Location

Oklahoma City, OK

• Jan 28, 2022

• #11

Buy a T lathe.

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