Quick Change Tool Post (QCTP)
To get the cutting frame or Drill Spindle in the right position for cutting, it is held in a quick change tool post (QCTP) bolted to a Cross Slide.
The reason it is called a quick change tool post is because the ornamental turner can easily change the tooling. To do so, the lever (the ball-ended rod projecting off to the right in the picture) is rotated anti-clockwise and the tool removed. Then a new tool is added, and the lever rotated clockwise to tighten it down.
The most common type of quick change tool post is an Aloris style (shown on the right).They come in a number of sizes; and most manufacturers have tried to map to the Aloris sizes.
- 0XA is the most common size for small metal lathes, and works for smaller ornamental lathes.
- AXA is the next size larger. It is commonly used, especially on larger ornamental lathes. One advantage to this size is that the boring bar holder works well to hold a 3/4" diameter shaft, and many universal cutting frames are this size.
- BXA would be rare to find.
These can be purchased as either piston style and wedge style. The wedge format is recommended by some as they say it is less likely to vibrate loose.
A good source for the 0XA quick change tool post (and Cross Slide) is LittleMachineShop.com. A starter-level part is :
- Part number 3113 - Quick Change Tool Post, 0XA
: "Aloris" comes from the creator's family name, Sirola, spelled backward.
Additional pictures of this device
Examples of work produced with this device
Examples of this device in use
How it works
Notes on making one
- Comparing Phase II Quick Change Tool Posts by Ken Newton. Ornamental Turners International Newsletter, Volume 20, No. 3 - Fall-Winter, 2013, pg. 34
Disclaimer: eMail comments to me at OTBookOfKnowledge @ Gmail.com. The process of woodturning involves the use of tools, machinery and materials which could cause injury or be a health hazard unless proper precautions are taken, including the wearing of appropriate protective equipment.