Question regarding QCTP for Porper model B lathe

[kunin35]

My center height from the mounting bracket is 2 1/16th. The spacer for my A2Z QCTP is 1 1/4". Here is a good reference chart to show the minimum center height for each QCTP.

http://littlemachineshop.com/info/qctp.php

On a side note, I have seen various tool posts mounted to the Model Bs over the years and I'd have to say that as long as you can get it to mount and achieve the correct center height, there shouldn't be a problem. I was worried about using the spacer because I thought (as did Joe Porper) it would flex when under a load but the guys at A2Z tested it and showed me all the data to ease my mind. I have been using it for years without any issues for my application.

I understand where Jonesey is coming from, especially with his machining background. You want the 'correct' tool for your machine and application.

Thanks for the input Ryan.

 

[takeitdown]

Riser

I bought 6 inches of 2.25" round aluminum stock and had a 1" piece cut off it. Received it yesterday. With that under my AXA100 chinese qctp i have the tool holder set about 1/2 an inch below the top of the body of the qctp. I will probably cut it to 0.75" to minimize the height.

Cant see it wobbling. I will face off both ends dead flat and square are drill out the 9/16 hole my qctp uses. I can even use the bolt it came with, its long enough.

 

[WilleeCue]

Thanks everyone for the open discussion and information about the types of QCTP's av ailable.

For my new Porper B lathe I decided to go with the BXA as it is big and heavy ... Mass means a lot to a lathe.
I am sure I will need to come up with a T nut but shouldn't need a spacer.
I guess I could have the Porper tool post nut re-drilled and taped for the new tool post rod.

Willee

Willee

 

[WilleeCue]

You're not actually that much of a moron are you? It has to be an act.. That's the most ridiculous, nonsensical pile of drivel I've read in quite some time. Apparently you're unable to process an analogy. Where did I say using an AXA, OXA or an A2Z is illogical? I said using anything smaller than a BXA is not as good of an option as using the BXA, simple really. WHY IS THAT? Because it's high enough to use without a spacer. Tool posts aren't designed to be used with spacers under them. Will they work like that? Possibly, but from a machining and a correct tool for the job standpoint it makes more sense to use the tool post that is the right height. PERIOD, that's not open for discussion or interpretation. Small lathes require smaller tool posts.. The difference in physical size of an AXA and a BXA is marginal, it won't affect the performance or operation of the Porper whatsoever. If a BXA is the correct height, then an AXA may be acceptable to some if they think a spacer is the best option, but to go smaller, 60% of the size of an AXA is NOT, 100% should not be an option if you want to do things the right way. You either don't care to use proper tools or you just want to argue about semantics. You are wrong, plain and simple, anything smaller than an AXA is too small for that machine. Sure, someone could jury rig a smaller one up to work, or maybe they modified the tool post mount to be higher, but in stock form it needs a taller tool post than an OXA.

You don't seem to understand that newbies come on these threads. If someone like you with little or no machine knowledge comes in here and reads your post and buys an OXA for their Porper, they're going to be in for a rude awakening because of your limited capacity and poor suggestion. I circumvented that from happening.

Go ahead and write more ignorant rants that aren't based in fact. Just know that I'm done talking to you, I've had my fill of idiocy for today! And thanks for the laugh! You, matching wits with me, yet you couldn't understand how a simple analogy applies... Hahaha. #BozoTheCuemaker

Jonsey, Not wanting to start anything but just so you know.

I have a Porper B lathe and based on what you posted here I bought the BXA QCTP and it is BIG and it is HEAVY ... much bigger and heaver that you need for this lathe.
The tool post alone weighs as much as the chuck!
Also it still needs a spacer under it to properly align most 3/8" tools to the center line of the lathe because it is made for 1/2" tools or larger.
Even the original Porper tool post has a spacer under it but it is not designed to be a metal lathe but instead it is a wood cutting lathe designed to do the tasks needed to make a pool cue so some of the rules for metal lathes just do not apply to it.
The boring bar holder of the BXA is made for a 3/4" shank.
I know that the specks say different but in real life it still needs a spacer to get the tools where they need to be.
So ... Not needing all that extra weight and size on my tool carriage, I will end up ordering the AXA or the OXA QCTP and have a local machine shop make me a spacer and a nut for it.
I will keep this BXA QCTP for when I get a real metal lathe.

Willee

 

[shakes]

While in an ideal world we all want to have the perfect tool for the job on hand, the fact of the matter is that these lathes are designed for cue making and form a small percentage of the lathe market. Not really big enough to have dedicated tools like QCTPs made for us. While I understand wanting to make sure that good information is passed along to later readers, attacking people for their opinions needs to stop. I'm not a machinist but I know several and I've never seen one stop working on a job because he didn't have the perfect tool. They will shim, create spacers or whatever they need to do to get the job done.

 

[rhncue]

While in an ideal world we all want to have the perfect tool for the job on hand, the fact of the matter is that these lathes are designed for cue making and form a small percentage of the lathe market. Not really big enough to have dedicated tools like QCTPs made for us. While I understand wanting to make sure that good information is passed along to later readers, attacking people for their opinions needs to stop. I'm not a machinist but I know several and I've never seen one stop working on a job because he didn't have the perfect tool. They will shim, create spacers or whatever they need to do to get the job done.

I get much more enjoyment out of designing, building or adapting tools and equipment than I do in actually building the cue itself.

Dick

 

[WilleeCue]

I get much more enjoyment out of designing, building or adapting tools and equipment than I do in actually building the cue itself.

Dick

Dick, I wish I had half of your knowledge, experience, and aptitude at making cues and the equipment needed to accomplish your visions.

You are indeed one of the masters of the craft.

Willee

 

[rhncue]

Dick, I wish I had half of your knowledge, experience, and aptitude at making cues and the equipment needed to accomplish your visions.

You are indeed one of the masters of the craft.

Willee

Thanks Willee for the gracious compliment. We've known each other for a long time now.

Dick

 

[conetip]

My 1st lathe with a QCTP is a myford 7 with the Dickson Italian type. All my lathes have this small QCTP and I just made spacer blocks to suite, so that any tool will interchange onto any lathe and have the correct centre height. The down side is the larger lathe uses a small shank tool. But since I rarely need to take more than 0.05inch cuts(0.1inch diameter) it is not really an issue.
There are real advantages to making spacer plates apart from having them all at the same tool height. You can have nice features like a positional stop,(usefull on the Taig type lathes when you may want a router mounted etc), you can also have an angle cut on a few of the sides, like 15,30,45 deg, for a quick repeatable reference.
If the spacers are made correctly there is no loss of rigidity in the setup.
From my experience,I have never found the wedge type QCTP holders to be as repeatable as a well made Italian type. But a poorly made Italian type is worse than the average wedge type for repeatability.
Neil

 

[rhncue]

My 1st lathe with a QCTP is a myford 7 with the Dickson Italian type. All my lathes have this small QCTP and I just made spacer blocks to suite, so that any tool will interchange onto any lathe and have the correct centre height. The down side is the larger lathe uses a small shank tool. But since I rarely need to take more than 0.05inch cuts(0.1inch diameter) it is not really an issue.
There are real advantages to making spacer plates apart from having them all at the same tool height. You can have nice features like a positional stop,(usefull on the Taig type lathes when you may want a router mounted etc), you can also have an angle cut on a few of the sides, like 15,30,45 deg, for a quick repeatable reference.
If the spacers are made correctly there is no loss of rigidity in the setup.
From my experience,I have never found the wedge type QCTP holders to be as repeatable as a well made Italian type. But a poorly made Italian type is worse than the average wedge type for repeatability.
Neil

I have a "B" wedge type on a Jet 12X40 lathe and a "B" piston type on a 13X36 Enco lathe. I shimmed the tool post on the Jet, as you mentioned and now I have about 2 dozen tool holders with different tools, routers, indicators and such that are interchangeable between the two lathes. I have read that the wedge type is more repeatable but I favor the piston type. The wedge type becomes difficult to seat the tool holders properly unless kept very clean.

Dick