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Using smaller tools on a larger lathe?

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burdickjp

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#1
I'm in the process of upgrading from a 7x16 lathe with a Tormach 0XA QCTP to an 11x29 lathe. It will not be coming with a QCTP.
I'm of the mind to purchase larger tools over time, but would like to make use of the machine sooner rather than later. I'm curious about my options, but didn't find any immediate information on using smaller tools on larger lathes.

I think I could make a spacer to use my current 0XA QCTP. I'd then be able to use all of my current 1/4" shank insert tooling.
I could then buy an AXA QCTP and shim all of my current 1/4" shank insert tooling to fit in the AXA tool holders.
I'd then buy more appropriately sized tooling and phase out my smaller tools over time.

What is the performance limitation of smaller tooling on larger lathes?
 

Eddyde

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#2
I dont see why it wouldn't work, although you probably wouldn't be abel to take as heavy a cut as the new lathe is capable of.
 

Suzuki4evr

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#3
I think th
I'm in the process of upgrading from a 7x16 lathe with a Tormach 0XA QCTP to an 11x29 lathe. It will not be coming with a QCTP.
I'm of the mind to purchase larger tools over time, but would like to make use of the machine sooner rather than later. I'm curious about my options, but didn't find any immediate information on using smaller tools on larger lathes.

I think I could make a spacer to use my current 0XA QCTP. I'd then be able to use all of my current 1/4" shank insert tooling.
I could then buy an AXA QCTP and shim all of my current 1/4" shank insert tooling to fit in the AXA tool holders.
I'd then buy more appropriately sized tooling and phase out my smaller tools over time.

What is the performance limitation of smaller tooling on larger lathes?
I think the tool limits itself no matter how big the lathe is. So if you get a bigger lathe I am sure you can use the smaller tooling until you can get the appropriate tooling. If I am wrong anybody is welcome to put me in my place :adore:.
 

markba633csi

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#4
Sure you can use smaller tooling- then upgrade later
 

P. Waller

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#5
The only "correct" sized tool is the one that works, the only limiting factor when using small tools in a large lathe is that they may not be able to handle the loads that the larger machine can generate. If so just reduce the feed rates and/or DOC, this will slow down the work and negates the advantage of a larger more powerful machine.

If I am required to do small work on a machine larger then needed I will use small workholding methods and small tools if needed.
For example, holding a 10-32 tap in a 5C collet fixture in an 8" chuck on a 15 X 48 lathe in order to reduce the tap shank diameter.

One may always find a way to hold small work and tools in a larger machine, holding large work and tooling in a smaller machine often proves more difficult and sometimes not possible.
tapturning.jpg
 
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benmychree

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#6
I'd think it would depend on whether or not you are planning to keep the smaller lathe or sell it; if selling it, I'd say, sell the QCTP with it and buy the AXA.
 

burdickjp

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I'd think it would depend on whether or not you are planning to keep the smaller lathe or sell it; if selling it, I'd say, sell the QCTP with it and buy the AXA.
I intend on selling the lathe. I don't expect I'd get my money's worth out of selling an 0XA QCTP with the lathe compared to continuing to use the tooling.
 

pacifica

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#8
Machinist go to a lot of trouble to use heavier more ridgid holders.
Just going from axa to bxa gave me superior surface finish, more precision, deeper cuts, less chatter.
Get the heavier items as soon as possible.
 

Eddyde

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#9
I intend on selling the lathe. I don't expect I'd get my money's worth out of selling an 0XA QCTP with the lathe compared to continuing to use the tooling.
However, you will probably never use the 0XA or the ¼" tooling again, once you get the AXA.
 

burdickjp

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#10
However, you will probably never use the 0XA or the ¼" tooling again, once you get the AXA.
I'm thinking so. I just wish I could get the little amount of money I have in the 0XA QCTP and 1/4" tooling.
 

Eddyde

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#11
IMHO, your more likely to sell the tooling and the lathe quicker and for the best $, if you bundle all together.
 

burdickjp

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#12
IMHO, your more likely to sell the tooling and the lathe quicker and for the best $, if you bundle all together.
You're probably right. Rebuilding with AXA tooling is going to be more expensive, but probably worth it.
 

kd4gij

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#13
What type tool post is on the bigger lathe?
 

jdedmon91

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#14
You want the bigger tool post. I’d sell some tooling with the small lathe just to get it sold. Most folks are entry level when buying smaller lathes. Do you have a mill? You can machine larger tools to fit your dovetails on the tool posts. That way you can use surplus inserts on e bay to save some dollars. That’s what I use



Sent from my iPad using Tapatalk
 

kd4gij

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#15
If the new lathe has the 4 way tool post you can shim the smaller tools and use them. I have done that before.
 

burdickjp

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The new lathe comes with a 4 way tool post. I'm not a fan of them, to be honest.

Maybe I'll use the opportunity to make another QCTP. I'd made one before for the 7x16 lathe, but eventually bought the 0XA because making tool holders for it was easier than making tool holders for the QCTP I'd designed.
Honestly, though, I'll probably end up buying the AXA. There's such a variety of tool holders available for it.
 

Eddyde

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#17
I have the Phase 2 AXA on my South Bend Heavy 10. It works great, though you do have too tighten up the screws with a little locktite on the tool holders, when you are first setting them up.
 

kd4gij

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#18
The new lathe comes with a 4 way tool post. I'm not a fan of them, to be honest.

Maybe I'll use the opportunity to make another QCTP. I'd made one before for the 7x16 lathe, but eventually bought the 0XA because making tool holders for it was easier than making tool holders for the QCTP I'd designed.
Honestly, though, I'll probably end up buying the AXA. There's such a variety of tool holders available for it.


Have you ever used a 4way? I have 3 lathes at work 2 have QCTP and one has a 4 way witch has a Right hand tool, left hand tool, and a threading tool. The 4 way is much faster and easer to use than the QCTP.
 

NortonDommi

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#19
I bought a cheap 'two for the price of one' deal on some 1/4" brazed carbide and made some holders out of 16 mm square bar with a slot cut in it so they would fit my AXA toolpost and did the same with 5/8" x 3/4" for use in the shaper and they work fine for my use.
 

Tim9

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#20
I'd get a Chinese knock off AXA and wouldn't look back. I purchased the Bostar AXA. I'd also keep my little lathe just like it is as a second lathe for back up and to work on small brass or plastic bushings. I am extremely happy that I still have my Atlas 618 with the OXA on it. I am constantly going to it for a small job...Especially when I don't feel like changing the tooling on my South Bend 9" lathe. I like small lathes as a backup or for small precision operations. The 4" chuck sits there ready for whatever.
 

burdickjp

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Have you ever used a 4way? I have 3 lathes at work 2 have QCTP and one has a 4 way witch has a Right hand tool, left hand tool, and a threading tool. The 4 way is much faster and easer to use than the QCTP.
I have used a 4 way tool post. I'm not a fan of it.
 

Tim9

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#22
The Four-Ways do seem faster when I watch YouTube videos. But... it’s all relative because if you need that fifth tool, then you need to break out the Allen wrench to change a tool.
 

pacifica

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#23
If you have a lot of tool holders,more than 4 and non repetitive operationsthan a qctp is best.
Of course a dedicated lathe with 4 way,maybe a turret post...well you get the idea of the possibilities $$
 

firestopper

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#24
Use what you have.
Like the saying goes, "You can put a boat on a ship, but you can't put a ship on a boat".
Eventually you can start to upgrade your cutters, holders and tool post.

Paco
 

Video_man

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#25
When I got my larger lathe, I made a 1/4 inch adapter for the BXA toolholder by milling a 1/4 inch x 1/4 inch slot in a 5/8 inch (toolbit size for BXA) piece of stock. Actually has come in handy a few times making small pieces in a collet, can get up close to the work with the smaller bits.
 
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