Looking for QCTP plans

May be a little OT but what is the advantage / disadvantage to the wedge type vs the piston type QCTP? I am comparison shopping both types and the piston type is always cheaper. Is this just due to being a simpler design. I have it in my pea brain that the wedge type will pull the tool holder down while securing it and make for a more rigid setup, but I have no proof of this. The ones I've used on much bigger lathes at school have all been wedge type.
 
I think I am in the same boat, lots of posts about piston verses wedge. Wedge type seems to be preferred by most. How about some of the homebrew models? The Harold Hall one sure seems doable for low dollars. I'm pretty sure its not as quick as the AXA type what to do............?
 
Glad I found this thread, I am also in the market for QCTP of the OXA type (mini lathe), but is there a noticeable difference between the wedge and piston type? Banging around in my shop, I doubt .002" will ever be needed accuracy anyway. Opinions, please?
 
Whilst this thread is quite old I still find on my website stats that readers are coming to my website using the links to it on these pages. With the subject being QCTH's, readers may be interested to learn that I have very recently placed on the web a video regarding my QCTH design. It explains the principles of the design, show the toolholder in use and tests being carried out to check how accurately a holder returns to the base when removed and replaced. These show that the height accuracy is better than 0.0004" (0.01mm) .

A link to the video can be found on this page http://www.homews.co.uk /page508.html

I have also prepared 20 other videos that I will be adding to the web over the next few months. If any reader would like notification when they are made public, go to my correspondence page and send me an email, just saying, add me to your mailing list.

The page can be found here http://www.homews.co.uk/page6.html

Harold Hall
 
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