Boring a turret on the lathe

[Investigator]

I have a simple question, of which the answer might not be simple but here we go;

I have a Logan 12" turret lathe with factory turret bored straight at .750". Could I get a MT Reamer, chuck it in a collet or similar in the lathe itself, and then advance the turret to cut a Morse Taper that I could use to hold MT live centers in?

 

[Nutfarmer]

Turrets are normally used with a straight sleeve or collet. I would look for an adaptor from 3\4 inch to Morse taper. Don't mess with boring or reaming out the turret . Or make a live center with a 3\4 inch shank. Once the turret is reamed out there is no going back.

 

[benmychree]

Or, you could buy a live center with 3/4" straight shanks, they are made for turret lathes.

 

[middle.road]

Or, you could buy a live center with 3/4" straight shanks, they are made for turret lathes.

Costly little boogers compared to MT's. Not going to bother to show MSC or Royal product prices. . .

Z LIVE CENTER 3/4" Straight Shank LIVE CENTER for lathe | eBay

We are carrying over 200 different types of high quality lathe live centers and dead centers. All of our products are 100% inspected. Shank Size: 3/4" Straight Shank. We will do our best to fix it.

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[Alcap]

I'm in the same situation with my Clausing lathe and been wondering the same on what to do . Could a bar be machined to fit the round turret hole then the bar drilled and reamed for a MT ?

 

[Choiliefan]

^^ Yes, that's the ticket and Bob's your uncle.

 

[MrWhoopee]

It appears that straight shank centers are quite common...........with a 6mm shank.

Here's one with a 3/8 shank.

32.0US $ |3/8" Straight Shank Pool Cue Building Tool Mini Lathe Custom 60° Live Center - Snooker & Billiard Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[Investigator]

So, maybe make an adapter, straight shank to fit the turret bore, extended away from the turret which is bored for an MT Taper? Something like this:



Put that in the turret? How would that effect accuracy of the center?

 

[mmcmdl]

A live center is easily manufactured and I wouldn't recommend altering your turret . Machine a straight shank or purchase . Some of the members prefer to build over purchase .

 

[MrWhoopee]

So, maybe make an adapter, straight shank to fit the turret bore, extended away from the turret which is bored for an MT Taper? Something like this:

View attachment 312030View attachment 312030

Put that in the turret? How would that effect accuracy of the center?

Yes, that's the idea.

As to the accuracy, there are a lot of variables in this equation. Even if everything is machined perfectly, each additional component reduces the rigidity. A turret itself is a compromise, trading some of the accuracy of a tailstock for rapid tool changes. Your original idea to modify the turret would be more rigid, but I agree that modifying the turret is not desirable. You're trying to adapt the machine to do work for which it was not intended. You have accept the compromises.